As filed with the Securities and Exchange Commission on February 10, 2006

Registration No. 333-131029

 

 

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Amendment No. 1

to

FORM S-1

REGISTRATION STATEMENT

LIGAND PHARMACEUTICALS INCORPORATED

Delaware		2834		77-0160744
(State or other jurisdiction of		(Primary Standard Industrial		(I.R.S. Employer
incorporation or organization)		Classification Code Number)		Identification Number)

Faye H. Russell, Esq.		Warner R. Broaddus, Esq.
Latham & Watkins LLP		Ligand Pharmaceuticals Incorporated
12636 High Bluff Drive, Suite 400		10275 Science Center Drive
San Diego, CA 92130		San Diego, CA 92121
(858) 523-5400		(858) 550-7500

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this Registration Statement.

     If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.     þ

     If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.     o

     If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.     o

     If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.     o

     If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box.     o

 

 

7,988,793 SHARES OF COMMON STOCK

     This prospectus relates to the offer and sale of up to 7,791,855 shares to be issued pursuant to awards granted or to be granted under our 2002 Stock Incentive Plan, or our 2002 Plan, and up to 147,510 shares to be issued pursuant to our 2002 Employee Stock Purchase Plan, or our 2002 ESPP.

     This prospectus also relates to the offer and sale of up to 49,428 shares of our common stock which may be offered from time to time by the selling stockholders identified on page 120 of this prospectus for their own accounts. Each of the selling stockholders named in the prospectus acquired the shares of common stock upon exercise of options previously granted to them as an employee, director or consultant of Ligand or as restricted stock granted to them as a director of Ligand, in each case under the terms of our 2002 Plan.

     It is anticipated that the selling stockholders will offer shares for sale at prevailing prices on the date of sale or in negotiated transactions. We will not receive any of the proceeds from the sale of the shares of our common stock by the selling stockholders under this prospectus. We are paying the expenses incurred in registering the shares, but all selling and other expenses incurred by each of the selling stockholders will be borne by that selling stockholder.

     Among the shares of common stock there are shares which are “restricted securities” under the Securities Act before their sale under this prospectus. This prospectus has been prepared in part for the purpose of registering the shares of common stock under the Securities Act to allow for future sales by the selling stockholders, on a continuous or delayed basis, to the public without restriction. Each selling stockholder and any participating broker or dealer may be deemed to be an “underwriter” within the meaning of the Securities Act, in which event any profit on the sale of shares by the selling stockholder and any commissions or discounts received by those brokers or dealers may be deemed to be underwriting compensation under the Securities Act.

     Our common stock is quoted on The Pink Sheets LLC under the symbol “LGND.” On February 9, 2006, the last reported sale price of our common stock was $12.85 per share.

     AN INVESTMENT IN THE SHARES OFFERED BY THIS PROSPECTUS IS SPECULATIVE AND SUBJECT TO RISK OF LOSS. SEE “RISK FACTORS” BEGINNING ON PAGE 7 AND THE TABLE OF CONTENTS ON PAGE i.

     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

THE DATE OF THIS PROSPECTUS IS                                                              , 2006.

TABLE OF CONTENTS

		Page
Prospectus Summary			1
Risk Factors			7
Special Note Regarding Forward-Looking Statements			18
Use of Proceeds			19
Dividend Policy			19
Capitalization			20
Selected Consolidated Financial Data			22
Management’s Discussion and Analysis of Financial Condition and Results of Operations			25
Business			64
Market Price of and Dividends on the Registrant’s Common Equity and Related Stockholder Matters			91
Management			92
Certain Relationships and Related Party Transactions			111
Principal Stockholders			113
Description of Capital Stock			116
Selling Stockholders			120
Plan of Distribution			121
Legal Matters			122
Experts			122
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure			122
Where You Can Find Additional Information			122
Controls and Procedures			123
Index to Consolidated Financial Statements			128
EXHIBIT 10.292
EXHIBIT 23.1

     You should rely only on the information contained in this prospectus. We have not authorized anyone to provide you with information different from that contained in this prospectus. The information contained in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or of any sale of our common stock.

PROSPECTUS SUMMARY

     This summary highlights information contained elsewhere in this prospectus and does not contain all of the information that you should consider in making your investment decision. Before investing in our common stock, you should carefully read this entire prospectus, including our consolidated financial statements and the related notes included in this prospectus and the information set forth under the headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

The Company

     Our goal is to build a profitable pharmaceutical company that discovers, develops and markets new drugs that address critical unmet medical needs in the areas of cancer, men’s and women’s health, skin diseases, osteoporosis, and metabolic, cardiovascular and inflammatory diseases. We strive to develop drugs that are more effective and/or safer than existing therapies, that are more convenient (taken orally or topically administered) and that are cost effective. We plan to build a profitable pharmaceutical company by generating income from the specialty pharmaceutical products we develop and market, and from research, milestone and royalty revenues resulting from our collaborations with large pharmaceutical partners, which develop and market products in large markets that are beyond our strategic focus or resources.

     We currently market four oncology products in the United States: Panretin^® gel (alitretinoin) 0.1%, ONTAK^® (denileukin diftitox) and Targretin^® (bexarotene) capsules, each of which was approved by the Food and Drug Administration, or FDA, in 1999; and Targretin^® (bexarotene) gel 1%, which was approved by the FDA in 2000. Our fifth and newest product, AVINZA^®, is a treatment for chronic, moderate-to-severe pain that was approved by the FDA in March 2002. In Europe, the European Commission, or EC, granted a Marketing Authorization, or MA, for Panretin gel in October 2000 and an MA for Targretin capsules in March 2001. We also continue efforts to acquire or in-license other products, like ONTAK and AVINZA, which have near-term prospects of FDA approval and which can be marketed by our specialty sales forces. We are developing additional products through our internal development programs and currently have various products in clinical development, including marketed products that we are testing for larger market indications such as non-small cell lung cancer, or NSCLC, chronic lymphocytic leukemia, or CLL, non-Hodgkin’s lymphoma, or NHL, and hand dermatitis.

     We have formed research and development collaborations with numerous global pharmaceutical companies, including Abbott Laboratories, Allergan, Inc., Bristol-Myers Squibb, Eli Lilly & Company, GlaxoSmithKline, Organon (Akzo Nobel), Parke-Davis, Pfizer Inc., TAP Pharmaceutical Products, Inc. (TAP), and Wyeth. As of August 31, 2005, our corporate partners had 13 Ligand products in human development and numerous compounds on an Investigational New Drug Application, or IND, track or in preclinical and research stages. These corporate partner products are being studied for the treatment of large market indications such as osteoporosis, diabetes, contraception and cardiovascular disease. One of these partner products, lasofoxifene, is being developed by Pfizer for osteoporosis and other indications. Pfizer filed a New Drug Application, or NDA, with the FDA in August 2004 for the use of lasofoxifene in the prevention of osteoporosis and then filed a supplemental NDA in December 2004 for the use of lasofoxifene in the treatment of vaginal atrophy. Two of these partner products are in pivotal Phase III clinical trials: bazedoxifene, which is being developed by Wyeth as monotherapy for osteoporosis and in combination with Wyeth’s PREMARIN for osteoporosis prevention, and vasomotor symptoms of menopause. A fourth partner product, LY519818, is being developed by Eli Lilly & Company for the treatment of type 2 diabetes. Lilly has announced plans to advance this product into Phase III registration studies after completion of two-year carcinogenicity studies and appropriate consultation with the FDA. Another Lilly product, LY674 has recently advanced into Phase II development for atherosclerosis and LY929 is in Phase I development for type 2 diabetes. Two additional partner products being developed by GlaxoSmithKline are in Phase II: GSK516 for cardiovascular disease and dislipidemia and SB497115 for thrombocytopenia. Other partner products in Phase II include pipendoxifene (formerly ERA-923) being developed by Wyeth for breast cancer and NSP-989 for contraception and NSP-989 combo for contraception in Phase I. In February 2005, GlaxoSmithKline commenced Phase I studies of SB-449448, a second product for thrombocytopenia and TAP commenced Phase I studies for LGD 2941 for the treatment of osteoporosis and frailty. Additionally, in September 2005, Pfizer announced the receipt of a non-

approvable letter from the FDA for the prevention of osteoporosis. However, lasofoxifene continues in Phase III clinical trials by Pfizer for the treatment of osteoporosis.

     Internal and collaborative research and development programs are built around our proprietary science technology, which is based on our leadership position in gene transcription technology. Panretin gel, Targretin capsules, and Targretin gel as well as our corporate partner products currently on human development track are modulators of gene transcription, working through key cellular or intracellular receptor targets discovered using our Intracellular Receptor, or IR, technology.

     On January 17, 2006, we signed an agreement with Organon USA, Inc. that terminates the AVINZA^® co-promotion agreement between the two companies and returns AVINZA rights to us. The effective date of the termination agreement is January 1, 2006, however the parties have agreed to continue to cooperate during a transition period ending September 30, 2006 to promote the product. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Overview”; “Business – Overview;” and “Business – Overview-Ligand Marketed Products — AVINZA Co-Promotion Agreement with Organon.”

Corporate Information

     We were incorporated in Delaware in 1987. Our principal executive offices are located at 10275 Science Center Drive, San Diego, California 92121, and our telephone number is (858) 550-7500. Our website address is http://www.ligand.com. The information on, or accessible through, our website is not part of this prospectus. Unless the context requires otherwise, references in this prospectus to the “Company,” “Ligand,” “we,” “us” and “our” refer to Ligand Pharmaceuticals Incorporated.

     Our trademarks, trade names and service marks referenced in this prospectus include Ligand, ONTAK, Panretin, Targretin, and AVINZA. Each other trademark, trade name or service mark appearing in this prospectus belongs to its owner.

THE OFFERING

Common stock offered.		Up to 7,988,793 shares, assuming the issuance of all shares of common stock reserved for issuance under the 2002 Plan and the 2002 ESPP. The amount also includes 49,428 shares previously issued under the 2002 Plan which may be offered from time to time by the selling stockholders.
Common stock to be outstanding after this offering		Up to 82,088,839 shares, assuming the issuance of all shares of common stock reserved for issuance under the 2002 Plan and 2002 ESPP. The amount also includes 49,428 shares previously issued under the 2002 Plan which may be offered from time to time by the selling stockholders.
Use of proceeds.		We will not receive any of the proceeds from the sale of the shares of our common stock by the selling stockholders under this prospectus. We will receive proceeds in connection with option exercises under the 2002 Plan and shares issued under the 2002 ESPP which will be based upon each granted option exercise price or purchase price, as applicable. The exercise price under our 2002 Plan is generally based upon the fair market value of our shares at the option grant date. The purchase price of the common stock acquired under our 2002 ESPP is equal to 85% of the lower of the fair market value per share of common stock on the start date of the offering period in which the individual is enrolled or the fair market value on the quarterly purchase date. Any proceeds received by us will be used for working capital and general corporate purposes. See “Use of Proceeds” and “Capitalization.”

          The number of shares of common stock that will be outstanding after this offering is based on shares outstanding as of December 31, 2005.

SELECTED CONSOLIDATED FINANCIAL DATA

     Set forth below are highlights from Ligand’s unaudited consolidated financial data as of and for the three and nine months ended September 30, 2005 and 2004 and Ligand’s consolidated financial data as of and for the years ended December 31, 2000 through 2004. The unaudited consolidated financial statements for September 30, 2005 and 2004 have been prepared on a basis consistent with our audited consolidated financial statements and include all adjustments, consisting only of normal recurring adjustments, we consider necessary for the fair statement of the information. The results of operations for the three and nine months ended September 30, 2005 and 2004 are not necessarily indicative of the results that may be expected for the full year or any other future period. Consolidated balance sheet data as of December 31, 2003, 2002, 2001, and 2000, and consolidated statements of operations data for the years then ended have been restated with respect to the matters described in Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 2 to our accompanying consolidated financial statements appearing elsewhere in this prospectus. As noted below, the consolidated balance sheet data as of December 31, 2000 through 2002 and the consolidated statement of operations data for the years ended 2000 and 2001 are unaudited.

     The selected consolidated financial data should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our interim and annual consolidated financial statements and related notes included elsewhere in this prospectus.

		Three Months Ended								Nine Months Ended
		September 30,								September 30,												Year Ended December 31,
		2005				2004				2005				2004				2004				2003				2002				2001				2000
		(Restated)								(Restated)																				(Restated)				(Restated)
		(Unaudited)								(Unaudited)												(Restated)				(Restated)				(Unaudited)				(Unaudited)
		(in thousands, except share and loss per share data)
Consolidated Statement of Operations Data:
Product sales (1)		$	42,584			$	31,934			$	119,364			$	86,172			$	120,335			$	55,324			$	30,326			$	32,038			$	18,818
Sale of royalty rights, net (2)			—				67				—				67				31,342				11,786				17,600				—				—
Collaborative research and development and other revenues			2,172				4,771				8,176				10,222				11,835				14,008				23,843				30,718				25,200
Cost of products sold (1)			9,807				9,819				31,539				27,082				39,804				26,557				14,738				11,582				8,355
Research and development expenses			12,911				16,747				42,170				50,830				65,204				66,678				59,060				49,427				49,903
Selling, general and administrative expenses			17,787				17,311				57,151				50,132				65,798				52,540				41,825				35,072				34,370
Co-promotion expense (3)			7,766				8,501				22,472				22,232				30,077				9,360				—				—				—
Loss from operations			(3,515	)			(15,606	)			(25,792	)			(53,815	)			(37,371	)			(74,017	)			(43,854	)			(33,325	)			(48,610	)
Loss before cumulative effect of changes in accounting principles			(6,281	)			(18,498	)			(33,677	)			(62,475	)			(45,141	)			(94,466	)			(52,257	)			(53,305	)			(62,005	)
Cumulative effect on prior years of changing method of revenue recognition (4)			—				—				—				—				—				—				—				—				(13,099	)
Cumulative effect of changing method of accounting for variable interest entity (5)			—				—				—				—				—				(2,005	)			—				—				—
Net loss			(6,281	)			(18,498	)			(33,677	)			(62,475	)			(45,141	)			(96,471	)			(52,257	)			(53,305	)			(75,104	)
Basic and diluted per share amounts:
Loss before cumulative effect of changes in accounting principles		$	(0.08	)		$	(0.25	)		$	(0.46	)		$	(0.85	)		$	(0.61	)		$	(1.33	)		$	(0.76	)		$	(0.90	)		$	(1.11	)
Cumulative effect on prior years of changing method of revenue recognition (4)			—				—				—				—				—				—				—				—				(0.24	)
Cumulative effect of changing method of accounting for variable interest entity (5)			—				—				—				—				—				(0.03	)			—				—				—
Net loss		$	(0.08	)		$	(0.25	)		$	(0.46	)		$	(0.85	)		$	(0.61	)		$	(1.36	)		$	(0.76	)		$	(0.90	)		$	(1.35	)
Weighted average number of common shares			74,041,204				73,845,613				73,998,594				73,635,562				73,692,987				70,685,234				69,118,976				59,413,270				55,664,921
Pro forma amounts assuming the changed method of accounting for variable interest entity is applied retroactively(5):
Net loss																						$	(94,352	)		$	(52,456	)		$	(53,600	)		$	(75,561	)
Basic and diluted net loss per share																						$	(1.34	)		$	(0.76	)		$	(0.90	)		$	(1.36	)

		At September 30,																At December 31,
		2005				2004				2004				2003				2002				2001				2000
						(Restated)								(Restated)				(Restated)				(Restated)				(Restated)
		(Unaudited)																(Unaudited)				(Unaudited)				(Unaudited)
														(in thousands)
Consolidated Balance Sheet Data:
Cash, cash equivalents, short-term investments and restricted investments		$	75,616			$	82,063			$	114,870			$	100,690			$	74,894			$	40,058			$	25,097
Working capital (deficit) (6)			(106,887	)			(69,998	)			(48,505	)			(19,776	)			18,370				2,375				8,372
Total assets			306,047				303,773				332,466				314,046				287,709				126,898				117,484
Current portion of deferred revenue, net			158,224				141,545				152,528				105,719				48,609				27,152				13,713
Long-term obligations (excludes long-term portion of deferred revenues, net)			173,242				174,431				174,214				173,851				162,329				138,837				133,575
Long-term portion of deferred revenue, net			4,279				3,216				4,512				3,448				3,595				4,164				5,727
Common stock subject to conditional redemption/repurchase			12,345				12,345				12,345				14,595				34,595				14,595				14,595
Accumulated deficit			(828,337	)			(811,994	)			(794,660	)			(749,519	)			(653,048	)			(600,791	)			(547,486	)
Total stockholders’ equity (deficit) (7)			(108,414	)			(93,404	)			(75,317	)			(37,554	)			8,925				(86,849	)			(72,405	)

RISK FACTORS

          The following is a summary description of some of the many risks we face in our business. You should carefully review these risks in evaluating an investment in our common stock.

Risks Related To Us and Our Business.

The restatement of our consolidated financial statements has had a material adverse impact on us, including increased costs, and the increased possibility of legal or administrative proceedings.

     We determined that our consolidated financial statements for the years ended December 31, 2002 and 2003, and as of and for the quarters of 2003, and for the first three quarters of 2004, as described in more detail in Note 2 to our accompanying interim and annual consolidated financial statements appearing elsewhere in this prospectus, should be restated. As a result of these events, we have become subject to a number of additional risks and uncertainties, including:

	•		We have incurred substantial unanticipated costs for accounting and legal fees in 2005 in connection with the restatement. Although the restatement is complete, we expect to continue to incur such costs as noted below.
	•		We have been named in a number of lawsuits that began in August 2004 claiming to be class actions and shareholder derivative actions. Additionally, in October 2005, we, our directors, and certain of our officers were named in a shareholder derivative action which was filed in the United States District Court for the Southern District of California. As a result of our restatement the plaintiffs in these lawsuits may make additional claims, expand existing claims and/or expand the time periods covered by the complaints. Other plaintiffs may bring additional actions with other claims, based on the restatement. If such events occur, we may incur additional substantial defense costs regardless of their outcome. Likewise, such events might cause a diversion of our management’s time and attention. If we do not prevail in any such actions, we could be required to pay substantial damages or settlement costs.
	•		The Securities and Exchange Commission (SEC) has instituted a formal investigation of the Company’s consolidated financial statements. This investigation will likely divert more of our management’s time and attention and cause us to incur substantial costs. Such investigations can also lead to fines or injunctions or orders with respect to future activities, as well as further substantial costs and diversion of management time and attention.
	•		The need to reconsider our accounting treatment and the restatement of our consolidated financial statements caused us to be late in filing our required reports on Form 10-K for December 31, 2004 and Forms 10-Q for the quarters ended March 31, 2005 and June 30, 2005, respectively, which caused us to be delisted from NASDAQ National Market. See “Our common stock was delisted from the NASDAQ National Market which may reduce the price of our common stock and the levels of liquidity available to our stockholders and cause confusion among investors” for additional discussion regarding the NASDAQ delisting.

Material weaknesses or deficiencies in our internal control over financial reporting could harm stockholder and business confidence on our financial reporting, our ability to obtain financing and other aspects of our business.

     Maintaining an effective system of internal control over financial reporting is necessary for us to provide reliable financial reports. In November 2005, we restated our consolidated financial statements for the years ended 2002 and 2003, and the 2003 quarterly periods and first three quarters of 2004. We also identified and reported a number of material weaknesses in our internal control over financial reporting, as described below.

     As a result of these material weaknesses, management’s assessment concluded that the Company’s internal control over financial reporting is ineffective. Some of the identified material weaknesses have not been fully

addressed. It is also possible that additional material weaknesses will be identified in the future. Until we remediate the remaining material weaknesses we have the risk of another restatement.

     The material weaknesses in our internal control over financial reporting related to the lack of controls and procedures to ensure that revenues are recognized in accordance with generally accepted accounting principles, the lack of controls and procedures to prevent shipping of short-dated products, the lack of adequate manpower and insufficient qualified accounting personnel to identify and resolve complex accounting issues, the lack of adequate record keeping and documentation of past transactional accounting decisions, the lack of controls over accruals and cut-offs, and the lack of controls surrounding financial reporting and close procedures.

     Because we have concluded that our internal control over financial reporting is not effective and our independent registered public accountants issued an adverse opinion on the effectiveness of our internal controls, and to the extent we identify future weaknesses or deficiencies, there could be material misstatements in our consolidated financial statements and we could fail to meet our financial reporting obligations. As a result, our ability to obtain additional financing, or obtain additional financing on favorable terms, could be materially and adversely affected, which, in turn, could materially and adversely affect our business, our financial condition and the market value of our securities. In addition, perceptions of us could also be adversely affected among customers, lenders, investors, securities analysts and others. Current material weaknesses or any future weaknesses or deficiencies could also hurt confidence in our business and consolidated financial statements and our ability to do business with these groups.

Our revenue recognition policy has changed to the sell-through method which is currently not used by most companies in the pharmaceutical industry which will make it more difficult to compare our results to the results of our competitors.

     Because our revenue recognition policy has changed to the sell-through method which reflects products sold through the distribution channel, we do not recognize revenue for the domestic product shipments of AVINZA, ONTAK, Targretin capsules and Targretin gel. Under our previous method of accounting, product sales were recognized at time of shipment.

     Under the sell-through revenue recognition method, future product sales and gross margins may be affected by the timing of certain gross to net sales adjustments including the cost of certain services provided by wholesalers under distribution service agreements, and the impact of price increases. Cost of products sold and therefore gross margins for our products may also be further impacted by changes in the timing of revenue recognition. Additionally, our revenue recognition models incorporate a significant amount of third party data from our wholesalers and IMS. Such data is subject to estimates and as such, any changes or corrections to these estimates identified in later periods, such as changes or corrections occurring as a result of natural disasters or other disruptions, including Hurricane Katrina, could affect the revenue that we report in future periods.

     As a result of our change in revenue recognition policy and the fact that the sell-through method is not widely used by our competitors, it may be difficult for potential and current stockholders to assess our financial results and compare these results to others in our industry. This may have an adverse effect on our stock price.

Our new revenue recognition models under the sell-through method are extremely complex and depend upon the accuracy and consistency of third party data as well as dependence upon key finance and accounting personnel to maintain and implement the controls surrounding such models.

     We have developed revenue recognition models under the sell-through method that are unique to the Company’s business and therefore are highly complex and not widely used in the pharmaceutical industry. The revenue recognition models incorporate a significant amount of third-party data from our wholesalers and IMS. To effectively maintain the revenue recognition models, we depend to a considerable degree upon the timely and accurate reporting to us of such data from these third parties and our key accounting and finance personnel to accurately interpolate such data into the models. If the third-party data is not calculated on a consistent basis and reported to us on an accurate or timely basis or we lose any of our key accounting and finance personnel, the accuracy of our consolidated financial statements could be materially affected. This could cause future delays in our earnings announcements, regulatory filings with the SEC, and potential delays in relisting or delisting with the NASDAQ.

Our common stock was delisted from the NASDAQ National Market which may reduce the price of our common stock and the levels of liquidity available to our stockholders and cause confusion among investors.

     Our common stock was delisted from the NASDAQ National Market on September 7, 2005. Unless and until the Company’s common stock is relisted on NASDAQ, its common stock is expected to be quoted on the Pink Sheets. The quotation of our common stock on the Pink Sheets may reduce the price of our common stock and the levels of liquidity available to our stockholders. In addition, the quotation of our common stock on the Pink Sheets may materially adversely affect our access to the capital markets, and any limitation on liquidity or reduction in the price of our common stock could materially adversely affect our ability to raise capital through alternative financing sources on terms acceptable to us or at all. Stocks that are quoted on the Pink Sheets are no longer eligible for margin loans, and a company quoted on the Pink Sheets cannot avail itself of federal preemption of state securities or “blue sky” laws, which adds substantial compliance costs to securities issuances, including pursuant to employee option plans, stock purchase plans and private or public offerings of securities. Our delisting from the NASDAQ National Market and quotation on the Pink Sheets may also result in other negative implications, including the potential loss of confidence by suppliers, customers and employees, the loss of institutional investor interest and fewer business development opportunities.

     While we have applied to have our common stock relisted on the NASDAQ National Market, we may not be successful in that effort. Even if we are successful in getting our common stock relisted on NASDAQ, the relisting may cause confusion among investors who have become accustomed to our being quoted on the Pink Sheets as they seek to determine our stock price or trade in our stock.

Our small number of products and our dependence on partners and other third parties means our results are vulnerable to setbacks with respect to any one product.

     We currently have only five products approved for marketing and a handful of other products/indications that have made significant progress through development. Because these numbers are small, especially the number of marketed products, any significant setback with respect to any one of them could significantly impair our operating results and/or reduce the market prices for our securities. Setbacks could include problems with shipping, distribution, manufacturing, product safety, marketing, government licenses and approvals, intellectual property rights and physician or patient acceptance of the product, as well as higher than expected total rebates, returns or discounts.

     In particular, AVINZA, our pain product, now accounts for a majority of our product revenues and we expect AVINZA revenues will continue to grow over the next several years. Thus any setback with respect to AVINZA could significantly impact our financial results and our share price. AVINZA was licensed from Elan Corporation which is currently its sole manufacturer. We have contracted with Cardinal to provide additional manufacturing capacity and second source back-up, however we expect Elan will be a significant supplier over the next several years. Any problems with Elan’s or Cardinal’s manufacturing operations or capacity could reduce sales of AVINZA, as could any licensing or other contract disputes with these suppliers.

     Similarly, our co-promotion partner executes a large part of the marketing and sales efforts for AVINZA and those efforts may be affected by our partner’s organization, operations, activities and events both related and unrelated to AVINZA. Our co-promotion efforts have encountered and continue to encounter a number of difficulties, uncertainties and challenges, including sales force reorganizations and lower than expected sales call and prescription volumes, which have hurt and could continue to hurt AVINZA sales growth. The negative impact on the product’s sales growth in turn has caused and may continue to cause our revenues and earnings to be disappointing. Any failure to fully optimize this co-promotion arrangement and the AVINZA brand, by either partner, could also cause AVINZA sales and our financial results to be disappointing and hurt our stock price. Any disputes with our co-promotion partner over these or other issues could harm the promotion and sales of AVINZA and could result in substantial costs to us. In addition, in January 2006 we announced that we were terminating the co-promotion arrangement with a nine-month transition period. Failure to successfully transition our partner’s efforts and functions back to Ligand and/or failure to repartner or otherwise replace our partner’s sales activities for AVINZA after the transition could adversely affect the sales of the product.

     AVINZA is a relatively new product and therefore the predictability of its commercial results is relatively low. Higher than expected discounts (especially PBM/GPO rebates and Medicaid rebates, which can be substantial), returns and chargebacks and/or slower than expected market penetration could reduce sales. Other setbacks that AVINZA could face in the sustained-release opioid market include product safety and abuse issues, regulatory action, intellectual property disputes and the inability to obtain sufficient quotas of morphine from the Drug Enforcement Agency (DEA) to support our production requirements.

     In particular, with respect to regulatory action and product safety issues, the FDA recently requested that we expand the warnings on the AVINZA label to alert doctors and patients to the dangers of using AVINZA with alcohol. We are in the process of making appropriate changes to the label. The FDA also requested clinical studies to investigate the risks associated with taking AVINZA with alcohol. We are in discussions with the FDA regarding the design of those studies. These additional warnings, studies and any further regulatory action could have significant adverse affects on AVINZA sales.

Our product development and commercialization involves a number of uncertainties, and we may never generate sufficient revenues from the sale of products to become profitable.

     We were founded in 1987. We have incurred significant losses since our inception. At September 30, 2005, our accumulated deficit was approximately $828.3 million. We began receiving revenues from the sale of pharmaceutical products in 1999. We achieved quarterly net income of $17.3 million during the fourth quarter of 2004, which was primarily the result of recognizing approximately $31.3 million from the sale of royalty rights to Royalty Pharma. However, for the three and nine months ended September 30, 2005, we incurred a net loss of $6.3 million and $33.7 million, respectively, and expect to incur net losses in future quarters. To consistently be profitable, we must successfully develop, clinically test, market and sell our products. Even if we consistently achieve profitability, we cannot predict the level of that profitability or whether we will be able to sustain profitability. We expect that our operating results will fluctuate from period to period as a result of differences in when we incur expenses and receive revenues from product sales, collaborative arrangements and other sources. Some of these fluctuations may be significant.

     Most of our products in development will require extensive additional development, including preclinical testing and human studies, as well as regulatory approvals, before we can market them. We cannot predict if or when any of the products we are developing or those being developed with our partners will be approved for marketing. For example, lasofoxifene (Oporia), a partner product being developed by Pfizer recently received a “non-approvable” decision from the FDA and trials of our market product Targretin failed to meet endpoints in Phase III trials in which we were studying its use in non small cell lung cancer. There are many reasons that we or our collaborative partners may fail in our efforts to develop our other potential products, including the possibility that:

	•		preclinical testing or human studies may show that our potential products are ineffective or cause harmful side effects;
	•		the products may fail to receive necessary regulatory approvals from the FDA or foreign authorities in a timely manner, or at all;
	•		the products, if approved, may not be produced in commercial quantities or at reasonable costs;
	•		the products, once approved, may not achieve commercial acceptance;
	•		regulatory or governmental authorities may apply restrictions to our products, which could adversely affect their commercial success; or
	•		the proprietary rights of other parties may prevent us or our partners from marketing the products.

     Any product development failures for these or other reasons, whether with our products or our partners’ products, may reduce our expected revenues, profits, and stock price.

Third-party reimbursement and health care reform policies may reduce our future sales.

     Sales of prescription drugs depend significantly on access to the formularies, or lists of approved prescription drugs, of third-party payers such as government and private insurance plans, as well as the availability of reimbursement to the consumer from these third-party payers. These third party payers frequently require drug

companies to provide predetermined discounts from list prices, and they are increasingly challenging the prices charged for medical products and services. Our current and potential products may not be considered cost-effective, may not be added to formularies and reimbursement to the consumer may not be available or sufficient to allow us to sell our products on a competitive basis. For example, we have current and recurring discussions with insurers regarding formulary access, discounts and reimbursement rates for our drugs, including AVINZA. We may not be able to negotiate favorable reimbursement rates and formulary status for our products or may have to pay significant discounts to obtain favorable rates and access. Only one of our products, ONTAK, is currently eligible to be reimbursed by Medicare (reimbursement for Targretin is being provided to a small group of patients by Medicare through December 2005 as part of the Medicare Replacement Drug Demonstration Project). Recently enacted changes by Medicare to the hospital outpatient payment reimbursement system may adversely affect reimbursement rates for ONTAK. Beginning in 2004, we have also experienced a significant increase in ONTAK units that are sold through Disproportionate Share Hospitals or DSHs. These hospitals are part of the federal government’s procurement system and thus receive significantly higher rebates than non-government purchasers of our products. As a result, our net revenues for ONTAK could be substantially reduced if this trend continues.

     In addition, the efforts of governments and third-party payers to contain or reduce the cost of health care will continue to affect the business and financial condition of drug companies such as us. A number of legislative and regulatory proposals to change the health care system have been discussed in recent years, including price caps and controls for pharmaceuticals. These proposals could reduce and/or cap the prices for our products or reduce government reimbursement rates for products such as ONTAK. In addition, an increasing emphasis on managed care in the United States has and will continue to increase pressure on drug pricing. We cannot predict whether legislative or regulatory proposals will be adopted or what effect those proposals or managed care efforts may have on our business. The announcement and/or adoption of such proposals or efforts could adversely affect our profit margins and business.

We are building marketing and sales capabilities in the United States and Europe which is an expensive and time-consuming process and may increase our operating losses.

     Developing the sales force to market and sell products is a difficult, expensive and time-consuming process. We have developed a US sales force of approximately 130 people. We also rely on third-party distributors to distribute our products. The distributors are responsible for providing many marketing support services, including customer service, order entry, shipping and billing and customer reimbursement assistance. In Europe, we currently rely on other companies to distribute and market our products. We have entered into agreements for the marketing and distribution of our products in territories such as the United Kingdom, Germany, France, Spain, Portugal, Greece, Italy and Central and South America and have established a subsidiary, Ligand Pharmaceuticals International, Inc., with a branch in London, England, to coordinate our European marketing and operations. Our reliance on these third parties means our results may suffer if any of them are unsuccessful or fail to perform as expected. We may not be able to continue to expand our sales and marketing capabilities sufficiently to successfully commercialize our products in the territories where they receive marketing approval. With respect to our co-promotion or licensing arrangements, for example our co-promotion agreement for AVINZA, which is currently in transition, any revenues we receive will depend substantially on the marketing and sales efforts of others, which may or may not be successful.

The cash flows from our product shipments may significantly fluctuate each period based on the nature of our products.

     Excluding AVINZA, our products are small-volume specialty pharmaceutical products that address the needs of cancer patients in relatively small niche markets with substantial geographical fluctuations in demand. To ensure patient access to our drugs, we maintain broad distribution capabilities with inventories held at approximately 150 locations throughout the United States. The purchasing and stocking patterns of our wholesaler customers for all our products are influenced by a number of factors that vary from product to product, including but not limited to overall level of demand, periodic promotions, required minimum shipping quantities and wholesaler competitive initiatives. As a result, the overall level of product in the distribution channel may average from two to six months’ worth of projected inventory usage. Although we have distribution services contracts in place to maintain stable inventories at our major wholesalers, if any of them were to substantially reduce the inventory they carry in a given

period, e.g. due to circumstances beyond their reasonable control, or contract termination or expiration, our shipments and cash flow for that period could be substantially lower than historical levels.

     In the second half of 2004, we entered into new fee-for-service or distributor services agreements for each of our products with the majority of our wholesaler customers. Under these agreements, in exchange for a set fee, the wholesalers have agreed to provide us with certain services. Concurrent with the implementation of these agreements we will no longer routinely offer these wholesalers promotional discounts or incentives. The agreements typically have a one-year initial term and are renewable.

Our drug development programs will require substantial additional future funding which could hurt our operational and financial condition.

     Our drug development programs require substantial additional capital to successfully complete them, arising from costs to:

	•		conduct research, preclinical testing and human studies;
	•		establish pilot scale and commercial scale manufacturing processes and facilities; and
	•		establish and develop quality control, regulatory, marketing, sales and administrative capabilities to support these programs.

     Our future operating and capital needs will depend on many factors, including:

	•		the pace of scientific progress in our research and development programs and the magnitude of these programs;
	•		the scope and results of preclinical testing and human studies;
	•		the time and costs involved in obtaining regulatory approvals;
	•		the time and costs involved in preparing, filing, prosecuting, maintaining and enforcing patent claims;
	•		competing technological and market developments;
	•		our ability to establish additional collaborations;
	•		changes in our existing collaborations;
	•		the cost of manufacturing scale-up; and
	•		the effectiveness of our commercialization activities.

     We currently estimate our research and development expenditures over the next 3 years to range between $200 million and $275 million. However, we base our outlook regarding the need for funds on many uncertain variables. Such uncertainties include regulatory approvals, the timing of events outside our direct control such as product launches by partners and the success of such product launches, negotiations with potential strategic partners and other factors. Any of these uncertain events can significantly change our cash requirements as they determine such one-time events as the receipt of major milestones and other payments.

     While we expect to fund our research and development activities from cash generated from internal operations to the extent possible, if we are unable to do so we may need to complete additional equity or debt financings or seek other external means of financing. If additional funds are required to support our operations and we are unable to obtain them on terms favorable to us, we may be required to cease or reduce further development or commercialization of our products, to sell some or all of our technology or assets or to merge with another entity.

We may require additional money to run our business and may be required to raise this money on terms which are not favorable or which reduce our stock price.

     We have incurred losses since our inception and may not generate positive cash flow to fund our operations for one or more years. As a result, we may need to complete additional equity or debt financings to fund our operations. Our inability to obtain additional financing could adversely affect our business. Financings may not be available at all or on favorable terms. In addition, these financings, if completed, still may not meet our capital needs and could result in substantial dilution to our stockholders. For instance, in April 2002 and September 2003 we issued an aggregate of 7.7 million shares of our common stock in a private placement. In addition, in November 2002 we

issued in a private placement $155.3 million in aggregate principal amount of our 6% Convertible Subordinated Notes due 2007, which could be converted into 25,149,025 shares of our common stock.

     If adequate funds are not available, we may be required to delay, reduce the scope of or eliminate one or more of our research or drug development programs, or our marketing and sales initiatives. Alternatively, we may be forced to attempt to continue development by entering into arrangements with collaborative partners or others that require us to relinquish some or all of our rights to technologies or drug candidates that we would not otherwise relinquish.

Our products face significant regulatory hurdles prior to marketing which could delay or prevent sales.

     Before we obtain the approvals necessary to sell any of our potential products, we must show through preclinical studies and human testing that each product is safe and effective. We and our partners have a number of products moving toward or currently in clinical trials, the most significant of which are our Phase III trials for Targretin capsules in NSCLC, lasofoxifene which is under NDA review and two products in Phase III trials by one of our partners involving bazedoxifene. Failure to show any product’s safety and effectiveness would delay or prevent regulatory approval of the product and could adversely affect our business. The clinical trials process is complex and uncertain. The results of preclinical studies and initial clinical trials may not necessarily predict the results from later large-scale clinical trials. In addition, clinical trials may not demonstrate a product’s safety and effectiveness to the satisfaction of the regulatory authorities. A number of companies have suffered significant setbacks in advanced clinical trials or in seeking regulatory approvals, despite promising results in earlier trials. The FDA may also require additional clinical trials after regulatory approvals are received, which could be expensive and time-consuming, and failure to successfully conduct those trials could jeopardize continued commercialization.

     In particular, we announced top-line data, or a summary of significant findings from our Phase III trials for Targretin capsules in NSCLC in late March of 2005. The data analysis showed that the trials did not meet their endpoints of improved overall survival and projected two-year survival. However, in both trials, additional subset analysis completed after the initial intent to treat results are being analyzed. We have been evaluating data from current and prior Phase II studies to see if they show a similar correlation between hypertriglyceridemia and increased survival. The data will further shape our future plans for Targretin. If further studies are justified they will be conducted on our own or with a partner or cooperative group. These analyses may not be favorable and may not be completed or demonstrate any hypothesis or endpoint. If these analyses or subsequent data fails to show safety or effectiveness, our stock price could be harmed. In addition, subsequent data may be inconclusive or mixed and could be delayed. The FDA may not approve Targretin for this new indication, or may delay approval, even if the data appears to be favorable. Any of these events could depress our stock price.

     The rate at which we complete our clinical trials depends on many factors, including our ability to obtain adequate supplies of the products to be tested and patient enrollment. Patient enrollment is a function of many factors, including the size of the patient population, the proximity of patients to clinical sites and the eligibility criteria for the trial. For example, each of our Phase III Targretin clinical trials involved approximately 600 patients and required significant time and investment to complete enrollments. Delays in patient enrollment for our other trials may result in increased costs and longer development times. In addition, our collaborative partners have rights to control product development and clinical programs for products developed under the collaborations. As a result, these collaborators may conduct these programs more slowly or in a different manner than we had expected. Even if clinical trials are completed, we or our collaborative partners still may not apply for FDA approval in a timely manner or the FDA still may not grant approval.

We face substantial competition which may limit our revenues.

     Some of the drugs that we are developing and marketing will compete with existing treatments. In addition, several companies are developing new drugs that target the same diseases that we are targeting and are taking IR-related and STAT-related approaches to drug development. The principal products competing with our products targeted at the cutaneous t-cell lymphoma market are Supergen/Abbott’s Nipent and interferon, which is marketed by a number of companies, including Schering-Plough’s Intron A. Products that compete with AVINZA include Purdue Pharma L.P.’s OxyContin and MS Contin and potentially Palladone (launched in early 2005 and subsequently withdrawn from the market), Janssen Pharmaceutica Products, L.P.’s Duragesic, aai Pharma’s Oramorph SR, Alpharma’s Kadian, and generic sustained release morphine sulfate, oxycodone and fentanyl. New

generic, A/B substitutable or other competitive products may also come to market and compete with our products, reducing our market share and revenues. Many of our existing or potential competitors, particularly large drug companies, have greater financial, technical and human resources than us and may be better equipped to develop, manufacture and market products. Many of these companies also have extensive experience in preclinical testing and human clinical trials, obtaining FDA and other regulatory approvals and manufacturing and marketing pharmaceutical products. In addition, academic institutions, governmental agencies and other public and private research organizations are developing products that may compete with the products we are developing. These institutions are becoming more aware of the commercial value of their findings and are seeking patent protection and licensing arrangements to collect payments for the use of their technologies. These institutions also may market competitive products on their own or through joint ventures and will compete with us in recruiting highly qualified scientific personnel.

We rely heavily on collaborative relationships and termination of any of these programs could reduce the financial resources available to us, including research funding and milestone payments.

     Our strategy for developing and commercializing many of our potential products, including products aimed at larger markets, includes entering into collaborations with corporate partners, licensors, licensees and others. These collaborations provide us with funding and research and development resources for potential products for the treatment or control of metabolic diseases, hematopoiesis, women’s health disorders, inflammation, cardiovascular disease, cancer and skin disease, and osteoporosis. These agreements also give our collaborative partners significant discretion when deciding whether or not to pursue any development program. Our collaborations may not continue or be successful.

     In addition, our collaborators may develop drugs, either alone or with others, that compete with the types of drugs they currently are developing with us. This would result in less support and increased competition for our programs. If products are approved for marketing under our collaborative programs, any revenues we receive will depend on the manufacturing, marketing and sales efforts of our collaborators, who generally retain commercialization rights under the collaborative agreements. Our current collaborators also generally have the right to terminate their collaborations under specified circumstances. If any of our collaborative partners breach or terminate their agreements with us or otherwise fail to conduct their collaborative activities successfully, our product development under these agreements will be delayed or terminated.

     We may have disputes in the future with our collaborators, including disputes concerning which of us owns the rights to any technology developed. For instance, we were involved in litigation with Pfizer, which we settled in April 1996, concerning our right to milestones and royalties based on the development and commercialization of droloxifene. These and other possible disagreements between us and our collaborators could delay our ability and the ability of our collaborators to achieve milestones or our receipt of other payments. In addition, any disagreements could delay, interrupt or terminate the collaborative research, development and commercialization of certain potential products, or could result in litigation or arbitration. The occurrence of any of these problems could be time-consuming and expensive and could adversely affect our business.

Some of our key technologies have not been used to produce marketed products and may not be capable of producing such products.

     To date, we have dedicated most of our resources to the research and development of potential drugs based upon our expertise in our IR technology. Even though there are marketed drugs that act through IRs, some aspects of our IR technologies have not been used to produce marketed products. Much remains to be learned about the function of IRs. If we are unable to apply our IR and Signal Transducer and Activator of Transcription, or STAT, technologies to the development of our potential products, we may not be successful in discovering or developing new products.

Challenges to or failure to secure patents and other proprietary rights may significantly hurt our business.

     Our success will depend on our ability and the ability of our licensors to obtain and maintain patents and proprietary rights for our potential products and to avoid infringing the proprietary rights of others, both in the United States and in foreign countries. Patents may not be issued from any of these applications currently on file, or, if issued, may not provide sufficient protection. In addition, disputes with licensors under our license agreements

may arise which could result in additional financial liability or loss of important technology and potential products and related revenue, if any.

     Our patent position, like that of many pharmaceutical companies, is uncertain and involves complex legal and technical questions for which important legal principles are unresolved. We may not develop or obtain rights to products or processes that are patentable. Even if we do obtain patents, they may not adequately protect the technology we own or have licensed. In addition, others may challenge, seek to invalidate, infringe or circumvent any patents we own or license, and rights we receive under those patents may not provide competitive advantages to us. Further, the manufacture, use or sale of our products may infringe the patent rights of others.

     Several drug companies and research and academic institutions have developed technologies, filed patent applications or received patents for technologies that may be related to our business. Others have filed patent applications and received patents that conflict with patents or patent applications we have licensed for our use, either by claiming the same methods or compounds or by claiming methods or compounds that could dominate those licensed to us. In addition, we may not be aware of all patents or patent applications that may impact our ability to make, use or sell any of our potential products. For example, US patent applications may be kept confidential while pending in the Patent and Trademark Office and patent applications filed in foreign countries are often first published six months or more after filing. Any conflicts resulting from the patent rights of others could significantly reduce the coverage of our patents and limit our ability to obtain meaningful patent protection. While we routinely receive communications or have conversations with the owners of other patents, none of these third parties have directly threatened an action or claim against us. If other companies obtain patents with conflicting claims, we may be required to obtain licenses to those patents or to develop or obtain alternative technology. We may not be able to obtain any such licenses on acceptable terms, or at all. Any failure to obtain such licenses could delay or prevent us from pursuing the development or commercialization of our potential products.

     We have had and will continue to have discussions with our current and potential collaborators regarding the scope and validity of our patents and other proprietary rights. If a collaborator or other party successfully establishes that our patent rights are invalid, we may not be able to continue our existing collaborations beyond their expiration. Any determination that our patent rights are invalid also could encourage our collaborators to terminate their agreements where contractually permitted. Such a determination could also adversely affect our ability to enter into new collaborations.

     We may also need to initiate litigation, which could be time-consuming and expensive, to enforce our proprietary rights or to determine the scope and validity of others’ rights. If litigation results, a court may find our patents or those of our licensors invalid or may find that we have infringed on a competitor’s rights. If any of our competitors have filed patent applications in the United States which claim technology we also have invented, the Patent and Trademark Office may require us to participate in expensive interference proceedings to determine who has the right to a patent for the technology.

     Hoffmann-La Roche Inc. has received a US patent, has made patent filings and has issued patents in foreign countries that relate to our Panretin gel products. While we were unsuccessful in having certain claims of the US patent awarded to Ligand in interference proceedings, we continue to believe that any relevant claims in these Hoffman-La Roche patents in relevant jurisdictions are invalid and that our current commercial activities and plans relating to Panretin are not covered by these Hoffman-La Roche patents in the US or elsewhere. In addition, we have our own portfolio of issued and pending patents in this area which cover our commercial activities, as well as other uses of 9-cis retinoic acid, in the US, Europe and elsewhere. However, if the claims in these Hoffman-La Roche patents are not invalid and/or unenforceable, they might block the use of Panretin gel in specified cancers, not currently under active development or commercialization by us.

     Novartis AG has filed an opposition to our European patent that covers the principal active ingredient of our ONTAK drug. We have received a favorable preliminary opinion from the European Patent Office, however this is not a final determination and Novartis has filed a response to the preliminary opinion that argues our patent is invalid. If the opposition is successful, we could lose our ONTAK patent protection in Europe which could substantially reduce our future ONTAK sales in that region. We could also incur substantial costs in asserting our rights in this opposition proceeding, as well as in other possible future proceedings in the United States.

     We also rely on unpatented trade secrets and know-how to protect and maintain our competitive position. We require our employees, consultants, collaborators and others to sign confidentiality agreements when they begin their relationship with us. These agreements may be breached, and we may not have adequate remedies for any breach. In addition, our competitors may independently discover our trade secrets.

Reliance on third-party manufacturers to supply our products risks supply interruption or contamination and difficulty controlling costs.

     We currently have no manufacturing facilities, and we rely on others for clinical or commercial production of our marketed and potential products. In addition, some raw materials necessary for the commercial manufacturing of our products are custom and must be obtained from a specific sole source. Elan manufactures AVINZA for us, Cambrex manufactures ONTAK active pharmaceutical ingredient for us, Raylo manufacture Targretin active pharmaceutical ingredient for us, and Cardinal Health manufactures Targretin capsules for us. We also recently entered into contracts with Cardinal Health to manufacture and package AVINZA and with Hollister-Stier for the filling and finishing of ONTAK. Each of these recent contracts calls for manufacturing and packaging the product at a new facility. Qualification and regulatory approval for these facilities are required prior to starting commercial manufacturing and was recently received in 2005 for both facilities. Any delays or failures of the manufacturing or packaging process could cause inventory problems or product shortages.

     To be successful, we will need to ensure continuity of the manufacture of our products, either directly or through others, in commercial quantities, in compliance with regulatory requirements at acceptable cost and in sufficient quantities to meet product growth demands. Any extended or unplanned manufacturing shutdowns, shortfalls or delays could be expensive and could result in inventory and product shortages. If we are unable to reliably manufacture our products our revenues could be adversely affected. In addition, if we are unable to supply products in development, our ability to conduct preclinical testing and human clinical trials will be adversely affected. This in turn could also delay our submission of products for regulatory approval and our initiation of new development programs. In addition, although other companies have manufactured drugs acting through IRs and STATs on a commercial scale, we may not be able to translate our core technologies or other technologies into drugs that can be manufactured at costs or in quantities to make marketable products.

     The manufacturing process also may be susceptible to contamination, which could cause the affected manufacturing facility to close until the contamination is identified and fixed. In addition, problems with equipment failure or operator error also could cause delays in filling our customers’ orders.

Our business exposes us to product liability risks or our products may need to be recalled, and we may not have sufficient insurance to cover any claims.

     Our business exposes us to potential product liability risks. Our products also may need to be recalled to address regulatory issues. A successful product liability claim or series of claims brought against us could result in payment of significant amounts of money and divert management’s attention from running the business. Some of the compounds we are investigating may be harmful to humans. For example, retinoids as a class are known to contain compounds which can cause birth defects. We may not be able to maintain our insurance on acceptable terms, or our insurance may not provide adequate protection in the case of a product liability claim. To the extent that product liability insurance, if available, does not cover potential claims, we will be required to self-insure the risks associated with such claims. We believe that we carry reasonably adequate insurance for product liability claims.

We use hazardous materials which requires us to incur substantial costs to comply with environmental regulations.

     In connection with our research and development activities, we handle hazardous materials, chemicals and various radioactive compounds. To properly dispose of these hazardous materials in compliance with environmental regulations, we are required to contract with third parties at substantial cost to us. Our annual cost of compliance with these regulations is approximately $700,000. We cannot completely eliminate the risk of accidental contamination or injury from the handling and disposing of hazardous materials, whether by us or by our third-party contractors. In the event of any accident, we could be held liable for any damages that result, which could be significant. We believe that we carry reasonably adequate insurance for toxic tort claims.

Future sales of our securities may depress the price of our securities.

     Sales of substantial amounts of our securities in the public market could seriously harm prevailing market prices for our securities. These sales might make it difficult or impossible for us to sell additional securities when we need to raise capital.

You may not receive a return on your securities other than through the sale of your securities.

     We have not paid any cash dividends on our common stock to date. We intend to retain any earnings to support the expansion of our business, and we do not anticipate paying cash dividends on any of our securities in the foreseeable future.

Our shareholder rights plan and charter documents may hinder or prevent change of control transactions.

     Our shareholder rights plan and provisions contained in our certificate of incorporation and bylaws may discourage transactions involving an actual or potential change in our ownership. In addition, our board of directors may issue shares of preferred stock without any further action by you. Such issuances may have the effect of delaying or preventing a change in our ownership. If changes in our ownership are discouraged, delayed or prevented, it would be more difficult for our current board of directors to be removed and replaced, even if you or our other stockholders believe that such actions are in the best interests of us and our stockholders.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

     This prospectus contains forward-looking statements, including statements regarding the demand for our marketed products, the diligence of our corporate partners in continuing development of product candidates for which they are responsible, the progress and timing of clinical trials, whether conducted by us or by our corporate partners, the safety and efficacy of our products and product candidates, the goals of our development activities, estimates of the potential markets for our product candidates, the success of our previously announced strategic alternatives evaluation, our operations and expenditures and projected cash needs. The forward-looking statements are contained principally in the sections entitled “Prospectus Summary,” “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business.” These statements relate to future events or our future financial performance and involve known and unknown risks, uncertainties and other factors that could cause our actual results, levels of activity, performance or achievement to differ materially from those expressed or implied by these forward-looking statements. These risks and uncertainties include, among others:

	•		our ability to successfully complete clinical development of our product candidates on expected timetables, or at all, which includes enrolling sufficient patients in our clinical trials and demonstrating the safety and efficacy of our product candidates in such trials;
	•		our ability to ensure continued supply of sufficient quantities of our products and product candidates to support market demand and for clinical trials;
	•		our ability to obtain, maintain and successfully enforce adequate patent and other intellectual property protection of our currently marketed products and product candidates that may be approved for sale;
	•		the content and timing of submissions to and decisions made by the FDA and other regulatory agencies, including demonstrating to the satisfaction of the FDA the safety and efficacy of product candidates we or our corporate partners are developing;
	•		our ability to develop a sufficient sales and marketing force or enter into agreements with third parties to sell and market any of our products or product candidates that may be approved for sale;
	•		the success of our competitors;
	•		our ability to obtain reimbursement for any of our products or product candidates that may be approved for sale from third-party payors, and the extent of such coverage;
	•		our ability to successfully complete our previously announced strategic alternatives evaluation; and
	•		our ability to raise additional funds in the capital markets, through arrangements with corporate partners or from other sources.

     Forward-looking statements include all statements that are not historical facts. In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “could,” “would,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “projects,” “predicts,” “potential,” or the negative of those terms, and similar expressions and comparable terminology intended to identify forward-looking statements. These statements reflect our current views with respect to future events and are based on assumptions and subject to risks and uncertainties. Given these uncertainties, you should not place undue reliance on these forward-looking statements. These forward-looking statements represent our estimates and assumptions only as of the date of this prospectus and, except as required by law, we undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise after the date of this prospectus. The forward-looking statements contained in this prospectus are excluded from the safe harbor protection provided by the Private Securities Litigation Reform Act of 1995 and Section 27A of the Securities Act of 1933, as amended.

USE OF PROCEEDS

          We will not receive any of the proceeds from the sale of the shares of our common stock by the selling stockholders under this prospectus. We will receive proceeds in connection with option exercises under the 2002 Plan and shares issued under the 2002 ESPP which will be based upon each granted option exercise price or purchase price, as applicable. The exercise price under our 2002 Plan is generally based upon the fair market value of our shares at the option grant date. The purchase price of the common stock acquired under our 2002 ESPP is equal to 85% of the lower of the fair market value per share of common stock on the start date of the offering period in which the individual is enrolled or the fair market value on the quarterly purchase date. Any proceeds received by us will be used for working capital and general corporate purposes. See “Use of Proceeds” and “Capitalization.”

DIVIDEND POLICY

          We have never declared or paid any cash dividends on our capital stock and do not intend to pay any cash dividends in the foreseeable future. We currently intend to retain our earnings, if any, to finance future growth.

CAPITALIZATION

     The following table sets forth our cash, cash equivalents and short-term investments and our capitalization as of September 30, 2005:

	•		on an actual basis; and
	•		on a pro forma as adjusted basis to reflect the proceeds from (a) the exercise of all currently outstanding options and (b) the future grant and exercise of all options/shares currently reserved for future issuance under the 2002 ESPP and 2002 Plan as follows:

	°		6,917,755 shares of common stock issuable upon the exercise of options outstanding as of September 30, 2005 at a weighted average exercise price of $11.78 per share.
	°		The addition of 234,667 shares of common stock issuable upon the exercise of options that were granted in December 2005 under the 2002 Plan at an exercise price of $11.35 per share.
	°		The reduction of 147,290 shares of common stock that were previously issuable upon the exercise of options that were granted under the 2002 Plan and were cancelled in the fourth quarter of 2005. The stock value is based upon an average exercise price of $12.08 per share.
	°		The addition of 789,348 shares of our common stock reserved for future issuance under our 2002 Plan (including the 750,000 share increase in the authorized shares under the 2002 Plan approved by our stockholders at the Company’s annual stockholders meeting held on January 31, 2006) at an estimated exercise price of $12.25 per share. The estimated per share price is based upon the current market value of our common stock on January 10, 2006.
	°		The addition of 147,510 shares of common stock reserved for issuance under our 2002 ESPP at an estimated purchase price of $10.41 per share. The estimated purchase per share price is based upon 85% of the purchase price of our common stock on January 10, 2006.

     The addition of 15,566 shares of restricted stock awarded on January 4, 2006 under the 2002 Plan to certain outside directors. The stock value is based upon the fair market value on January 4, 2006, the award date, which was $11.56 per share. We received no proceeds from the issuances of such shares of restricted stock. See “Selling Stockholders.” You should read this table together with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and the related notes appearing elsewhere in this prospectus. As described above, the pro forma capitalization assumes that all of the stock options or shares previously granted or reserved for future issuance will be exercised or issued. However, not all of such options or shares may be issued, exercised or granted.

		September 30, 2005 (Unaudited)
						Pro Forma As
		Actual				Adjusted
		(in thousands, except
		share and par value data)
Cash, cash equivalents, short-term investments and restricted investments		$	75,616			$	169,173
Common stock subject to conditional redemption; 997,568 shares issued and outstanding at September 30, 2005		$	12,345			$	12,345
Stockholders’ deficit:
Convertible preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding pro forma as adjusted		$	—			$	—
Common stock, $0.001 par value; 200,000,000 shares authorized; 73,133,715 and 81,091,271shares issued and outstanding pro forma as adjusted			73				81
Additional paid-in capital			720,943				814,672
Accumulated other comprehensive (loss) income			(182	)			(182	)
Accumulated deficit			(828,337	)			(828,517	)
Treasury stock, at cost; 73,842 shares			(911	)			(911	)
Total stockholders’ deficit		$	(108,414	)		$	(14,857	)

SELECTED CONSOLIDATED FINANCIAL DATA

     Set forth below are highlights from Ligand’s unaudited consolidated financial data as of and for the three and nine months ended September 30, 2005 and 2004 and Ligand’s consolidated financial data as of and for the years ended December 31, 2000 through 2004. The unaudited consolidated financial statements for September 30, 2005 and 2004 have been prepared on a basis consistent with our audited consolidated financial statements and include all adjustments, consisting only of normal recurring adjustments, we consider necessary for the fair statement of the information. The results of operations for the three and nine months ended September 30, 2005 and 2004 are not necessarily indicative of the results that may be expected for the full year or any other future period. Consolidated balance sheet data as of December 31, 2003, 2002, 2001, and 2000, and consolidated statements of operations data for the years then ended have been restated with respect to the matters described in Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 2 to our accompanying consolidated financial statements appearing elsewhere in this prospectus. As noted below, the consolidated balance sheet data as of December 31, 2000 through 2002 and the consolidated statement of operations data for the years ended 2000 and 2001 are unaudited.

     The selected consolidated financial data should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our interim and annual consolidated financial statements and related notes included elsewhere in this prospectus.

		Three Months Ended								Nine Months Ended
		September 30,								September 30,												Year Ended December 31,
		2005				2004				2005				2004				2004												2001				2000
		(Restated)								(Restated)												2003				2002				(Restated)				(Restated)
		(Unaudited)								(Unaudited)												(Restated)				(Restated)				(Unaudited)				(Unaudited)
		(in thousands, except share and loss per share data)
Consolidated Statement of Operations Data:
Product sales (1)		$	42,584			$	31,934			$	119,364			$	86,172			$	120,335			$	55,324			$	30,326			$	32,038			$	18,818
Sale of royalty rights, net (2)			—				67				—				67				31,342				11,786				17,600				—				—
Collaborative research and development and other revenues			2,172				4,771				8,176				10,222				11,835				14,008				23,843				30,718				25,200
Cost of products sold (1)			9,807				9,819				31,539				27,082				39,804				26,557				14,738				11,582				8,355
Research and development expenses			12,911				16,747				42,170				50,830				65,204				66,678				59,060				49,427				49,903
Selling, general and administrative expenses			17,787				17,311				57,151				50,132				65,798				52,540				41,825				35,072				34,370
Co-promotion expense (3)			7,766				8,501				22,472				22,232				30,077				9,360				—				—				—
Loss from operations			(3,515	)			(15,606	)			(25,792	)			(53,815	)			(37,371	)			(74,017	)			(43,854	)			(33,325	)			(48,610	)
Loss before cumulative effect of changes in accounting principles			(6,281	)			(18,498	)			(33,677	)			(62,475	)			(45,141	)			(94,466	)			(52,257	)			(53,305	)			(62,005	)
Cumulative effect on prior years of changing method of revenue recognition (4)			—				—				—				—				—				—				—				—				(13,099	)
Cumulative effect of changing method of accounting for variable interest entity (5)			—				—				—				—				—				(2,005	)			—				—				—
Net loss			(6,281	)			(18,498	)			(33,677	)			(62,475	)			(45,141	)			(96,471	)			(52,257	)			(53,305	)			(75,104	)
Basic and diluted per share amounts:
Loss before cumulative effect of changes in accounting principles		$	(0.08	)		$	(0.25	)		$	(0.46	)		$	(0.85	)		$	(0.61	)		$	(1.33	)		$	(0.76	)		$	(0.90	)		$	(1.11	)
Cumulative effect on prior years of changing method of revenue recognition (4)			—				—				—				—				—				—				—				—				(0.24	)
Cumulative effect of changing method of accounting for variable interest entity (5)			—				—				—				—				—				(0.03	)			—				—				—
Net loss		$	(0.08	)		$	(0.25	)		$	(0.46	)		$	(0.85	)		$	(0.61	)		$	(1.36	)		$	(0.76	)		$	(0.90	)		$	(1.35	)
Weighted average number of common shares			74,041,204				73,845,613				73,998,594				73,635,562				73,692,987				70,685,234				69,118,976				59,413,270				55,664,921
Pro forma amounts assuming the changed method of accounting for variable interest entity is applied retroactively(5):
Net loss																						$	(94,352	)		$	(52,456	)		$	(53,600	)		$	(75,561	)
Basic and diluted net loss per share																						$	(1.34	)		$	(0.76	)		$	(0.90	)		$	(1.36	)

		At September 30,																At December 31,
		2005				2004				2004				2003				2002				2001				2000
						(Restated)								(Restated)				(Restated)				(Restated)				(Restated)
		(Unaudited)																(Unaudited)				(Unaudited)				(Unaudited)
														(in thousands)
Consolidated Balance Sheet Data:
Cash, cash equivalents, short-term investments and restricted investments		$	75,616			$	82,063			$	114,870			$	100,690			$	74,894			$	40,058			$	25,097
Working capital (deficit) (6)			(106,887	)			(69,998	)			(48,505	)			(19,776	)			18,370				2,375				8,372
Total assets			306,047				303,773				332,466				314,046				287,709				126,898				117,484
Current portion of deferred revenue, net			158,224				141,545				152,528				105,719				48,609				27,152				13,713
Long-term obligations (excludes long-term portion of deferred revenues, net)			173,242				174,431				174,214				173,851				162,329				138,837				133,575
Long-term portion of deferred revenue, net			4,279				3,216				4,512				3,448				3,595				4,164				5,727
Common stock subject to conditional redemption/repurchase			12,345				12,345				12,345				14,595				34,595				14,595				14,595
Accumulated deficit			(828,337	)			(811,994	)			(794,660	)			(749,519	)			(653,048	)			(600,791	)			(547,486	)
Total stockholders’ equity (deficit) (7)			(108,414	)			(93,404	)			(75,317	)			(37,554	)			8,925				(86,849	)			(72,405	)

MANAGEMENT’S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     Caution: This discussion and analysis may contain predictions, estimates and other forward-looking statements that involve a number of risks and uncertainties, including those discussed under the heading “Risk Factors.” This outlook represents our current judgment on the future direction of our business. These statements include those related to management’s trend analyses and expectations, Organon discussions, product and corporate partner pipeline, litigation,, the SEC enforcement investigation, the potential relisting of the Company’s securities on the NASDAQ National Market, and material weaknesses and remediation. Actual events or results may differ materially from Ligand’s expectations. For example, there can be no assurance of that the Company’s subsequent processes and initiatives such as the Company achieving relisting on the NASDAQ Stock Market and if so, when relisting will occur, that the Company’s currently ongoing or future litigation (including private litigation and the SEC investigation) will not have an adverse effect on the Company, that corporate or partner pipeline products will gain approval or success in the market, that the Company will remediate any identified material weaknesses, or that the sell-through revenue recognition models will not require adjustment and not result in a subsequent restatement. In addition, the Company’s financial results and stock price may suffer as a result of the previously announced restatement and delisting action by NASDAQ or as a result of any failure to remediate material weaknesses and its relationships with its vendors, stockholders or other creditors may suffer. Such risks and uncertainties could cause actual results to differ materially from any future performance suggested. We undertake no obligation to release publicly the results of any revisions to these forward-looking statements to reflect events or circumstances arising after the date of this prospectus. This caution is made under the safe harbor provisions of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended.

          Background of the Restatement

     On March 17, 2005, the Company announced that in connection with the preparation of its consolidated financial statements for 2004 and the audit of those consolidated financial statements, the Audit Committee of the Board of Directors would conduct a review, with the assistance of management, of the Company’s revenue recognition policies and accounting for product sales, including its estimates of product returns under SFAS 48 – “Revenue When Right of Return Exists” (SFAS 48) and Staff Accounting Bulletin (SAB) No. 101 – “Revenue Recognition,” as amended by SAB 104 (hereinafter referred to as “SAB 104”). The review included the Company’s revenue recognition policies and practices for current and past periods as well as the Company’s internal control over financial reporting as it related to those items. The Company also reviewed the accounting and classification of its sales of royalty rights in its consolidated statements of operations. The Audit Committee retained Dorsey & Whitney LLP as independent counsel. The Audit Committee and independent counsel subsequently retained PricewaterhouseCoopers as their independent accounting consultants to assist in the review. In addition, the Company, through its counsel, Latham & Watkins LLP, retained FTI Ten Eyck to provide an independent accounting perspective in connection with the accounting issues under review.

     On May 20, 2005, the Company announced that the Audit Committee had completed its accounting review and that the Company would restate its consolidated financial statements as of December 31, 2003 and for the years ended December 31, 2003 and 2002, and as of and for the first three quarters of 2004 and for the quarters of 2003. The Audit Committee and management independently reviewed the Company’s revenue recognition practices and policies for product sales for 2003 and 2002 and each of the three quarters in the period ended September 30, 2004. These reviews focused on whether the Company had properly recognized revenue on product shipments to distributors under SFAS 48 and SAB 104. Based on these reviews, the Company determined that it had not met all of the criteria under SFAS 48 and SAB 104 to recognize revenue upon shipment. As a result of this error, the Company determined to restate its financial results and to report financial results under the sell-through revenue recognition method for the domestic product shipments of AVINZA, ONTAK, Targretin capsules and Targretin gel. The Company also announced that it was continuing its work to review the accounting and classification of its sales of royalty rights in its consolidated statements of operations and that the Audit Committee review found no evidence of improper or fraudulent actions or practices by any member of management or that management acted in bad faith in adopting and administering the Company’s historical revenue recognition policies.

     Subsequent to the Company’s announcement that it would restate its consolidated financial statements, the Company’s previous auditors declined to be re-engaged to audit the restatement. As a result, the Audit Committee engaged BDO Seidman, LLP (“BDO”), the Company’s current independent registered public accounting firm, to re-audit the consolidated financial statements for the fiscal years ended December 31, 2003 and 2002. During the course of the re-audits other errors were identified that affected the restated consolidated financial statements.

     In connection with the restatement, the SEC instituted a formal investigation concerning the Company’s consolidated financial statements. These matters were previously the subject of an informal SEC inquiry. Ligand has been cooperating fully with the SEC and will continue to do so in order to bring the investigation to a conclusion as promptly as possible.

The Restatement and Other Related Matters

     In November 2005, the Company filed its annual report on Form 10-K for the year ended December 31, 2004 which also restated its consolidated financial statements for the years ended 2002 and 2003, and the 2003 quarterly periods and the first three quarters of 2004. Set forth below is a summary of the significant determinations regarding the restatement and additional matters addressed in the course of the restatement.

     Revenue Recognition. The restatement corrects the recognition of revenue for transactions involving each of the Company’s products that did not satisfy all of the conditions for revenue recognition contained in SFAS 48 and SAB 104. The Company’s products impacted by this restatement are the domestic product shipments of AVINZA, ONTAK, Targretin Capsules, and Targretin Gel. Specifically, although the Company believed it had met each of the criteria for recognizing revenue upon shipment of each of its products, management subsequently determined that based upon SFAS 48 and SAB 104 it did not have the ability to make reasonable estimates of future returns because there was (i) a lack of sufficient visibility into the wholesaler and retail distribution channels; (ii) an absence of historical experience with similar products; (iii) increasing levels of inventory in the wholesale and retail distribution channels as a result of increasing demand of the Company’s new products among other factors; and (iv) a concentration of a few large distributors. As a result, the Company could not make reliable and reasonable estimates of returns which precluded it from recognizing revenue at the time of product shipment, and therefore such transactions were restated using the sell-through method. The restatement of product revenue under the sell-through method required the correction of other accounts whose balances are largely based upon the prior accounting policy. Such accounts include gross to net sales adjustments and cost of goods (products) sold. Gross to net sales adjustments include allowances for returns, rebates, chargebacks, discounts, and promotions, among others. Cost of product sold includes manufacturing costs and royalties.

     The restatement did not affect the revenue recognition of Panretin or the Company’s international product sales. For Panretin, the Company’s wholesalers only stock minimal amounts of product, if any. As such, wholesaler orders are considered to approximate end-customer demand for the product. For international sales, the Company’s products are sold to third-party distributors for which the Company has had minimal returns. For these sales, the Company believes that it has met the SFAS 48 and SAB 104 criteria for recognizing revenue.

     Specific models were developed for: AVINZA, including a separate model for each dosage strength (a retail-stocked product for which the sell-through revenue recognition event is prescriptions as reported by a third party data provider, IMS Health Incorporated, or IMS); Targretin capsules and gel (for which revenue recognition is based on wholesaler out-movement as reported by IMS); and ONTAK (for which revenue recognition is based on wholesaler out-movement as reported to the Company by its wholesalers as the product is generally not stocked in pharmacies). Separate models were also required for each of the adjustments associated with the gross to net sales adjustments and cost of goods sold. The Company also developed separate demand reconciliations for each product to assess the reasonableness of the third party information described above.

     Under the sell-through method used in the restatement and on a going-forward basis, the Company does not recognize revenue upon shipment of product to the wholesaler. For these shipments, the Company invoices the wholesaler, records deferred revenue at gross invoice sales price less estimated cash discounts and, for ONTAK, end-customer returns, and classifies the inventory held by the wholesaler as “deferred cost of goods sold” within “other current assets.” Additionally, for royalties paid to technology partners based on product shipments to wholesalers, the Company records the cost of such royalties as “deferred royalty expense” within “other current

assets.” Royalties paid to technology partners are deferred as the Company has the right to offset royalties paid for product that are later returned against subsequent royalty obligations. Royalties for which the Company does not have the ability to offset (for example, at the end of the contracted royalty period) are expensed in the period the royalty obligation becomes due. The Company recognizes revenue when inventory is “sold through” (as discussed below), on a first-in first-out (FIFO) basis. Sell-through for AVINZA is considered to be at the prescription level or at the time of end user consumption for non-retail prescriptions. Thus, changes in wholesaler or retail pharmacy inventories of AVINZA do not affect the Company’s product revenues. Sell-through for ONTAK, Targretin capsules, and Targretin gel is considered to be at the time the product moves from the wholesaler to the wholesaler’s customer. Changes in wholesaler inventories for all the Company’s products, including product that the wholesaler returns to the Company for credit, do not affect product revenues but will be reflected as a change in deferred product revenue.

     The Company’s revenue recognition is subject to the inherent limitations of estimates that rely on third-party data, as certain-third party information is itself in the form of estimates. Accordingly, the Company’s sales and revenue recognition under the sell-through method reflect the Company’s estimates of actual product sold through the distribution channel. The estimates by third parties include inventory levels and customer sell-through information the Company obtains from wholesalers which currently account for a large percentage of the market demand for its products. The Company also uses third-party market research data to make estimates where time lags prevent the use of actual data. Certain third-party data and estimates are validated against the Company’s internal product movement information. To assess the reasonableness of third-party demand (i.e. sell-through) information, the Company prepares separate demand reconciliations based on inventory in the distribution channel. Differences identified through these demand reconciliations outside an acceptable range will be recognized as an adjustment to the third-party reported demand in the period those differences are identified. This adjustment mechanism is designed to identify and correct for any material variances between reported and actual demand over time and other potential anomalies such as inventory shrinkage at wholesalers or retail pharmacies.

     As a result of the Company’s adoption of the sell-through method, it recorded reductions to net product sales in the amounts of $12.8 million and $30.2 million for the three and nine months ended September 30, 2004. Additionally, for the years ended December 31, 2003 and 2002, the Company recorded a corresponding reduction to net product sales in the amounts of $59.2 million and $24.2 million, respectively. Revenue which has been deferred will be recognized as the product sells through in future periods as discussed above.

          Effects of the Sell-Through Method on Consolidated Financial Statements

     Under the sell-through revenue recognition method, product sales and gross margins for 2004, 2003 and 2002 were affected by the timing of gross to net sales adjustments including wholesaler promotional discounts, the cost of certain services provided by wholesalers under distribution service agreements, and the impact of price increases. Additionally, cost of products sold and therefore gross margins for the Company’s products were further impacted by the changes in the timing of revenue recognition and certain related changes in accounting as a result of the change to the sell-through revenue recognition method. The more significant impacts are summarized below:

	•		Impact of changed sales volumes - a significant amount of cost of products sold is comprised of “fixed costs” including amortization of acquired technology and product rights that result in lower margins at lower sales levels.
	•		Returns - as discussed above, when product is shipped into the wholesale channel, inventory held by the wholesaler (and subsequently held by retail pharmacies in the case of AVINZA) is classified as “deferred cost of product sold” which is included in “Other current assets.” At the time of shipment, the Company makes an estimate of units that may be returned and records a reserve for those units against the “deferred cost of goods sold” account. Upon an announced price increase, the Company revalues its estimate of deferred product revenue to be returned to recognize the potential higher credit a wholesaler may take upon product return determined as the difference between the new and the initial wholesaler acquisition cost. The impact of this reserve revaluation is likewise reflected as a charge to the Company’s statement of operations in the period the Company announces such price increase.

	•		Change to AVINZA product cost – in November 2002, the Company and Elan Corporation agreed to amend the terms of the AVINZA license and supply agreement. Under the terms of the amended agreement, Elan’s adjusted royalty and supply price of AVINZA is approximately 10% of the product’s net sales, compared to approximately 30-35% in the prior agreement. As noted above, product shipped to the wholesaler is recorded as “deferred cost of goods sold” and subsequently recognized as cost of sales when the product sells-through. In the restated revenue, the majority of product manufactured by Elan in 2002 at the higher contractual cost of production, sold-through and was recognized as cost of sales in 2003. Accordingly, AVINZA gross margins for 2003 under sell-through revenue recognition reflect this higher product cost compared to the previously reported 2003 margins under the sell-in revenue recognition method. If future sales volume increases and future return levels and product mix are similar to the Company’s experience in 2004, the Company expects that its gross margin levels overall will increase and stabilize over time. Gross margin on all product sales for 2004, 2003, and 2002 was 67%, 52%, and 51%, respectively.
	•		Royalties – under the sell-through method, royalties paid based on unit shipments to wholesalers are deferred and recognized as royalty expense as those units are sold-through and recognized as revenue.

     Sale of Royalty Rights. In March 2002, the Company entered into an agreement with Royalty Pharma AG (“Royalty Pharma”) to sell a portion of its rights to future royalties from the net sales of three Selective Estrogen Receptor Modulator, or SERM, products now in late stage development with two of the Company’s collaborative partners, Pfizer Inc. and American Home Products Corporation, now known as Wyeth, in addition to the right, but not the obligation, to acquire additional percentages of the SERM products’ net sales on future dates by giving the Company notice. When the Company entered into the agreement with Royalty Pharma and upon each subsequent exercise of its options to acquire additional percentages of royalty payments to the Company, the Company recognized the consideration paid to it by Royalty Pharma as revenue. Cumulative payments totaling $63.3 million were received from Royalty Pharma from 2002 through 2004 for the sale of royalty rights from the net sales of the SERM products.

     The Company determined that a portion of the revenue recognized under the Royalty Pharma agreement should have been deferred since Pfizer and Wyeth each had the right to offset a portion of future royalty payments for, and to the extent of, amounts previously paid to the Company for certain developmental milestones. As of September 30, 2004, approximately $1.2 million was recorded as deferred revenue in connection with the offset rights by the Company’s collaborative partners, Pfizer and Wyeth. The amounts associated with the offset rights against future royalty payments will be recognized as revenue upon receipt of future royalties from the respective partners or upon determination that no such future royalties will be forthcoming. Additionally, the Company determined to defer a portion of such revenue as it relates to the value of the option rights sold to Royalty Pharma until Royalty Pharma exercised such options or upon the expiration of the options. As of September 30, 2004, the value of options outstanding recorded as deferred revenue was $0.1 million, which was recognized in the fourth quarter of 2004. The value of options outstanding at the end of 2002 which was recognized in 2003 was approximately $0.1 million. The value of options outstanding at the end of 2003 which was recognized in 2004 was approximately $0.2 million. As of December 31, 2004, all of the option revenue deferred during fiscal 2002 and 2003 has been recognized. Accordingly, for the years ended December 31, 2003 and 2002, the Company has restated revenue from the sale of royalty rights under the Royalty Pharma agreement, which reduced royalty revenue by approximately $0.7 million for each of the years ended December 31, 2003 and 2002.

     Buy-Out of Salk Royalty Obligation. In March 2004, the Company paid The Salk Institute $1.12 million in connection with the Company’s exercise of an option to buy out milestone payments, other payment-sharing obligations and royalty payments due on future sales of lasofoxifene, a product under development by Pfizer for which a NDA was expected to be filed in 2004. At the time of the Company’s exercise of its buyout right, the payment was accounted for as a prepaid royalty asset to be amortized on a straight-line basis over the period for which the Company had a contractual right to the lasofoxifene royalties. This payment was included in “other assets” on the Company’s consolidated balance sheet at September 30, 2004. Pfizer filed the NDA for lasofoxifene with the United States Food and Drug Administration in the third quarter of 2004. Because the NDA had not been filed at the time the Company exercised its buyout right, the Company determined in the course of the restatement that the payment should have been expensed. Accordingly, the Company corrected such error and recognized the Salk payment as development expense for the three months ended March 31, 2004 and the year ended December 31, 2004.

     X-Ceptor Therapeutics, Inc. In June 1999, the Company invested $6.0 million in X-Ceptor Therapeutics, Inc. (“X- Ceptor”) through the acquisition of convertible preferred stock. Additionally, in October 1999, the Company issued warrants to X-Ceptor investors, founders and certain employees to purchase 950,000 shares of Ligand common stock with an exercise price of $10.00 per share and an expiration date of October 6, 2006. At the time of issuance, the warrants were recorded at their fair value of $4.20 per warrant or $4.0 million as deferred warrant expense within stockholders’ deficit and were amortized to operating expense through June 2002. The Company determined during the course of the restatement that the warrant issuance should have been capitalized as an asset rather than treated as a deferred expense within equity since the warrant issuance was deemed to be consideration for the right granted to the Company by X-Ceptor to acquire all of the outstanding stock of X-Ceptor (the “Purchase Right”). Accordingly, the Company recorded the Purchase Right as an other asset in the amount of $4.0 million. The effect of this change resulted in a decrease in expense for the year ended December 31, 2002 of $0.7 million. This asset was subsequently written off to “Other, net expense” in the quarter ended March 31, 2003, the period the Company determined that the Purchase Right would not be exercised.

     Pfizer Settlement Agreement and Elan Shares. In April 1996, the Company and Pfizer entered into a settlement agreement with respect to a lawsuit filed in December 1994 by the Company against Pfizer. In connection with a collaborative research agreement the Company entered into with Pfizer in 1991, Pfizer purchased shares of the Company’s common stock. Under the terms of the settlement agreement, at the option of either the Company or Pfizer, milestone and royalty payments owed to the Company can be satisfied by Pfizer by transferring to the Company shares of the Company’s common stock at an exchange ratio of $12.375 per share. At the time of the settlement, the Company accounted for the prior issuance of common stock to Pfizer as equity on its balance sheet.

     Additionally, in 1998, Elan International (Elan) agreed to exclusively license to the Company in the United States and Canada its proprietary product AVINZA. In connection with the November 2002 restructuring of the AVINZA license agreement with Elan, the Company agreed to repurchase approximately 2.2 million shares of the Company’s common stock held by an affiliate of Elan (the “Elan Shares”) for $9.00 a share. At the time of the November 2002 agreement, the shares were classified as equity on the Company’s balance sheet in the amount of $20.0 million. The Elan Shares were repurchased and retired in February 2003.

     In conjunction with the restatement, the remaining common stock issued and outstanding to Pfizer following the settlement and the Elan Shares were reclassified as “common stock subject to conditional redemption/repurchase” (between liabilities and equity) in accordance with Emerging Issue Task Force Topic D-98, “Classification and Measurement of Redeemable Securities” (EITF D-98), which was issued in July 2001.

     EITF D-98 requires the security to be classified outside of permanent equity if there is a possibility of redemption of securities that is not solely within the control of the issuer. Since Pfizer has the option to settle with Company’s shares milestone and royalties payments owed to the Company and, as of December 31, 2002, the Company was required to repurchase the Elan shares, the Company determined that such factors indicated that the redemptions were not within the Company’s control, and accordingly, EITF D-98 was applicable to the treatment of the common stock issued to Pfizer and the Elan Shares. This adjustment totaling $14.6 million only had an effect on the balance sheet classification, not on the consolidated statements of operations. In the third quarter of 2004, Pfizer elected to pay a $2.0 million milestone payment due the Company in stock and subsequently tendered approximately 181,000 shares to the Company. The Company retired such shares in September 2004 and “common stock subject to conditional redemption” was reduced by approximately $2.3 million.

     Seragen Litigation. On December 11, 2001, a lawsuit was filed in the United States District Court for the District of Massachusetts against the Company by the Trustees of Boston University and other former stakeholders of Seragen. The suit was subsequently transferred to federal district court in Delaware. The complaint alleges breach of contract, breach of the implied covenants of good faith and fair dealing and unfair and deceptive trade practices based on, among other things, allegations that the Company wrongfully withheld approximately $2.1 million in consideration due the plaintiffs under the Seragen acquisition agreement. This amount had been previously accrued for in the Company’s consolidated financial statements in 1998. The complaint seeks payment of the withheld consideration and treble damages. The Company filed a motion to dismiss the unfair and deceptive trade practices claim. The Court subsequently granted the Company’s motion to dismiss the unfair and deceptive trade practices claim (i.e. the treble damages claim), in April 2003. In November 2003, the Court granted Boston University’s motion for summary judgment, and entered judgment for Boston University. In January 2004, the district court

issued an amended judgment awarding interest of approximately $0.7 million to the plaintiffs in addition to the approximately $2.1 million withheld. The Court award of interest was previously not accrued. Though the Company had appealed the judgment in this case as well as the award of interest and the calculation of damages, in view of the judgment, the Company revised its consolidated financial statements in the fourth quarter of 2003 to record a charge of $0.7 million. In January 2006, the appeals court affirmed the district court’s ruling against us. Additional interest on the above amounts of approximately $0.1 million has accrued through January 2006 and was added to the judgment. The withheld amount including interest was paid in February 2006.

     Other. In conjunction with the restatement, the Company also made other adjustments and reclassifications to its accounting for various other errors, in various years, including, but not limited to: (1) a correction to the Company’s estimate of the accrual for clinical trials; (2) corrections to estimates of other accrued liabilities; (3) royalty payments made to technology partners; (4) straight-line recognition of rent expense for contractual annual rent increases; and (5) corrections to estimates of future obligations and bonuses to employees.

     For the quarters ended September 30, 2004, June 30, 2004, and March 31, 2004, the restatement increased the net loss by $11.7 million or $0.16 per share; $7.8 million or $0.11 per share; and $8.8 million or $0.12 per share, respectively. For the quarter ended December 31, 2003, the restatement decreased net income by $24.6 million or $0.34 per share and increased net loss for the quarters ended September 30, 2003, June 30, 2003, and March 31, 2003 by $11.6 million or $0.16 per share; $12.0 million or $0.18 per share; and $10.8 million or $0.15 per share, respectively. The restatement increased the net loss in 2003 by $59.0 million or $0.83 per share to $96.5 million or $1.36 per share. The restatement increased the net loss in 2002 by $19.7 million or $0.29 per share to $52.3 million or $0.76 per share. For periods prior to 2002, the restatement was effectuated through an aggregate adjustment as of January 1, 2002 of $15.1 million to the Company’s accumulated deficit. Additionally, for periods prior to 2002, restatement of the Pfizer settlement agreement was effectuated as of January 1, 2002 through a reduction of additional paid in capital and a corresponding increase to “common stock subject to conditional redemption/repurchase” (between liabilities and equity) of $14.6 million. The restatement regarding the Elan shares had no effect on periods prior to 2002 since it was effectuated as of November 2002 through a reduction of additional paid in capital and a corresponding increase to “common stock subject to conditional redemption/repurchase” of $20.0 million.

          Overview

     We discover, develop and market drugs that address patients’ critical unmet medical needs in the areas of cancer, pain, men’s and women’s health or hormone-related health issues, skin diseases, osteoporosis, blood disorders and metabolic, cardiovascular and inflammatory diseases. Our drug discovery and development programs are based on our proprietary gene transcription technology, primarily related to Intracellular Receptors, also known as IRs, a type of sensor or switch inside cells that turns genes on and off, and Signal Transducers and Activators of Transcription, also known as STATs, which are another type of gene switch.

     We currently market five products in the United States: AVINZA, for the relief of chronic, moderate to severe pain; ONTAK, for the treatment of patients with persistent or recurrent cutaneous T-cell lymphoma, or CTCL; Targretin capsules, for the treatment of CTCL in patients who are refractory to at least one prior systemic therapy; Targretin gel, for the topical treatment of cutaneous lesions in patients with early stage CTCL; and Panretin gel, for the treatment of Kaposi’s sarcoma in AIDS patients. In Europe, we have marketing authorizations for Panretin gel and Targretin capsules and are currently marketing these products under arrangements with local distributors. In April 2003, we withdrew our ONZAR (ONTAK in the U.S.) marketing authorization application in Europe for our first generation product. It was our assessment that the cost of the additional clinical and technical information requested by the European Agency for the Evaluation of Medicinal Products, or EMEA, for the first generation product would be better spent on acceleration of the second generation ONTAK formulation development. We expect to resubmit the ONZAR application with the second generation product in 2006 or early 2007.

     In February 2003, we entered into an agreement for the co-promotion of AVINZA with Organon Pharmaceuticals USA Inc. (Organon). Under the terms of the agreement, Organon committed to a specified minimum number of primary and secondary product calls delivered to certain high prescribing physicians and hospitals beginning in March 2003. Organon’s compensation is structured as a percentage of net sales, based on the Company’s standard accounting principles and generally accepted accounting principles (GAAP), which pays

Organon for their efforts and also provides Organon an economic incentive for performance and results. In exchange, and prior to the termination of the co-promotion agreement with Organon discussed below, we paid Organon a percentage of AVINZA net sales based on the following schedule:

Annual Net Sales of AVINZA		% of Incremental Net Sales Paid to Organon by Ligand
$0-35 million (2003 only)		0% (2003 only)
$0-150 million		30%
$150-300 million		40%
$300-425 million		50%
> $425 million		45%

     On January 17, 2006, we signed an agreement with Organon that terminates the AVINZA^® co-promotion agreement between the two companies and returns AVINZA rights to Ligand. The effective date of the termination agreement is January 1, 2006, however the parties have agreed to continue to cooperate during a transition period ending September 30, 2006 (the “Transition Period”) to promote the product. The Transition Period co-operation includes a minimum number of product sales calls per quarter (100,000 for Organon and 30,000 for Ligand with an aggregate of 375,000 and 90,000 respectively for the Transition Period) as well as the transition of ongoing promotions, managed care contracts, clinical trials and key opinion leader relationships to Ligand. During the Transition Period, Ligand will pay Organon an amount equal to 23 % of AVINZA net sales as reported by Ligand. Ligand will also pay and be responsible for the design and execution of all clinical, advertising and promotion expenses and activities.

     As previously disclosed, Organon and Ligand were in discussions regarding the calculation of prior co-promote fees under the co-promotion agreement. In connection with the termination of the co-promotion agreement, the companies resolved their disagreement concerning prior co-promote fees and Ligand paid Organon $14.75 million in January 2006. This amount had been previously accrued in the Company’s consolidated financial statements as of September 30, 2005. The companies also agreed that Organon’s compensation for the fourth quarter of 2005 would be calculated based on Ligand’s reported AVINZA net sales determined in accordance with U.S. GAAP.

     Additionally, in consideration of the early termination and return of rights under the terms of the agreement, Ligand will unconditionally pay Organon $37.75 million on or before October 15, 2006. Ligand will further pay Organon $10.0 million on or before January 15, 2007, provided that Organon has made its minimum required level of sales calls. Under certain conditions, including change of control, the cash payments will accelerate. In addition, after the termination, Ligand will make quarterly royalty payments to Organon equal to 6.5%of AVINZA net sales through December 31, 2012 and thereafter 6.0% through patent expiration, currently anticipated to be November of 2017.

     We are currently involved in the research phase of a research and development collaboration with TAP Pharmaceutical Products Inc., or TAP. Collaborations in the development phase are being pursued by Eli Lilly and Company, GlaxoSmithKline, Pfizer, TAP and Wyeth. We receive funding during the research phase of the arrangements and milestone and royalty payments as products are developed and marketed by our corporate partners. In addition, in connection with some of these collaborations, we received non-refundable up-front payments.

     We have been unprofitable since our inception on an annual basis. We achieved quarterly net income of $17.3 million during the fourth quarter of fiscal 2004, which was primarily the result of recognizing approximately $31.3 million from the sale of royalty rights to Royalty Pharma. However, we expect to incur net losses in future quarters. To consistently be profitable, we must successfully develop, clinically test, market and sell our products. Even if we consistently achieve profitability, we cannot predict the level of that profitability or whether we will be able to sustain profitability. We expect that our operating results will fluctuate from period to period as a result of differences in the timing of revenues earned from product sales, expenses incurred, collaborative arrangements and other sources. Some of these fluctuations may be significant.

Recent Developments

Restructuring of ONTAK Royalty

     In November 2004, Ligand and Eli Lilly and Company (Lilly) agreed to amend their ONTAK royalty agreement to add options in 2005 that if exercised would restructure our royalty obligations on net sales of ONTAK. Under the revised agreement, we and Lilly each obtained two options. Our options, exercisable in January 2005 and April 2005, provided for the buy down of a portion of our ONTAK royalty obligation on net sales in the United States for total consideration of $33.0 million. Lilly also had two options exercisable in July 2005 and October 2005 to trigger the same royalty buy-downs for total consideration of up to $37.0 million dependent on whether we have exercised one or both of our options.

     Our first option, providing for a one-time payment of $20.0 million to Lilly in exchange for the elimination of our ONTAK royalty obligations in 2005 and a reduced reverse-tiered royalty scale on ONTAK sales in the U.S. thereafter, was exercised in January 2005. The second option, exercised in April 2005, provided for a one-time payment of $13.0 million to Lilly in exchange for the elimination of royalties on ONTAK net sales in the U.S. in 2006 and a reduced reverse-tiered royalty thereafter. Beginning in 2007 and throughout the remaining ONTAK patent life (2014), we will pay no royalties to Lilly on U.S. sales up to $38.0 million. Thereafter, Ligand would pay royalties to Lilly at a rate of 20% on net U.S. sales between $38.0 million and $50.0 million; at a rate of 15% on net U.S. sales between $50.0 million and $72.0 million; and at a rate of 10% on net U.S. sales in excess of $72.0 million.

Targretin Capsules Development Programs

     In March 2005, we announced that the final data analysis for Targretin capsules in NSCLC showed that the trials did not meet their endpoints of improved overall survival and projected two year survival. We are continuing to analyze the data and apply it to the continued development of Targretin capsules in NSCLC. Failure to demonstrate the product’s safety and effectiveness would delay or prevent regulatory approval of the product and could adversely affect our business as well as our stock price. See “Risk Factors – Our products face significant regulatory hurdles prior to marketing which could delay or prevent sales.”

Additional Manufacturing Sources

     In 2004, we entered into contracts with Cardinal Health to provide a second source for AVINZA, and with Hollister-Stier to fill and finish ONTAK. In July 2005, we announced that the FDA approved the Hollister-Stier facility for fill/finish of ONTAK. In August 2005, the FDA approved the production of AVINZA at the Cardinal Health facility which provides a second source of supply, thus diversifying the AVINZA supply chain and increasing production capacity.

Amended and Restated Research, Development and License Agreement with Wyeth

     On December 1, 2005, we entered into an Amended and Restated Research, Development and License Agreement with Wyeth (formerly American Home Products Corporation). Under the previous agreement, effective September 2, 1994 as amended January 16, 1996, May 24, 1996, September 2, 1997 and September 9, 1999 (collectively the “Prior Agreement”), Wyeth and us engaged in a joint research and development effort to discover and/or design small molecule compounds which act through the estrogen and progesterone receptors and to develop pharmaceutical products from such compounds. Wyeth sponsored certain research and development activities to be carried out by us and Wyeth may commercialize products resulting from the joint research and development subject to certain milestone and royalty payments. The Amended and Restated Agreement does not materially change the prior rights and obligations of the parties with respect to Wyeth compounds, currently in development, e.g. bazedoxifene, in late stage development for osteoporosis.

     The parties agreed to amend and restate the Prior Agreement principally to better define, simplify and clarify the universe of research compounds resulting from the research and development efforts of the parties, combine and clarify categories of those compounds and related milestones and royalties and resolve a number of milestone

payment issues that had arisen. Among other things, the Amended and Restated Agreement calls for Wyeth to pay Ligand $1.8 million representing the difference between amounts paid under the old compound categories versus the amounts due under the new, single category.

Termination of Organon Copromotion Agreement

     On January 17, 2006, we signed an agreement with Organon that terminates the AVINZA^® co-promotion agreement between the two companies and returns AVINZA rights to Ligand. For a discussion of this agreement, please see “—Overview” above.

Restructuring of AVINZA Sales Force

          In January 2006, 18 Ligand sales representatives previously promoting AVINZA to primary care physicians were redeployed to call on pain specialists and all Ligand primary care territories were eliminated. In connection with this restructuring, 11 primary-care sales representatives were terminated. The AVINZA sales force restructuring was implemented to improve sales call coverage and effectiveness among high prescribing pain specialists.

Conversion of 6% Convertible Subordinated Notes

          In January 2006, certain holders of our outstanding 6% convertible subordinated notes converted notes with a face value of $24.1 million into 3,903,965 shares of common stock.

          Results of Operations

          Three and Nine Months Ended September 30, 2005 and September 30, 2004

     Total revenues for the three months ended September 30, 2005 were $44.8 million compared to $36.8 million for the same 2004 period. Loss from operations was $3.5 million for the three months ended September 30, 2005 compared to $15.6 million for the same 2004 period. Net loss for the three months ended September 30, 2005 was $6.3 million ($0.08 per share) compared to $18.5 million ($0.25 per share) for the same 2004 period.

     Total revenues for the nine months ended September 30, 2005 were $127.5 million compared to $96.5 million for the same 2004 period. Loss from operations was $25.8 million for the nine months ended September 30, 2005 compared to $53.8 million for the same 2004 period. Net loss for the nine months ended September 30, 2005 was $33.7 million ($0.46 per share) compared to $62.5 million ($0.85 per share) for the same 2004 period.

          Net Product Sales

     The Company’s domestic net product sales for AVINZA, ONTAK, Targretin capsules and Targretin gel, are determined on a sell-through basis less allowances for rebates, chargebacks, discounts, and losses to be incurred on returns from wholesalers resulting from increases in the selling price of the Company’s products. We recognize revenue for Panretin upon shipment to wholesalers as our wholesaler customers only stock minimal amounts of Panretin, if any. As such, wholesaler orders are considered to approximate end-customer demand for the product. Revenues from sales of Panretin are net of allowances for rebates, chargebacks, returns and discounts. For international shipments of our product, revenue is recognized upon shipment to our third-party international distributors. In addition, the Company incurs certain distributor service agreement fees related to the management of its product by wholesalers. These fees have been recorded within net product sales. For ONTAK, the Company also has established reserves for returns from end customers (i.e. other than wholesalers) after sell-through revenue recognition has occurred.

     A summary of the revenue recognition policy used for each of our products and the expiration of the underlying patents for each product is as follows:

		Method		Revenue Recognition Event		Patent Expiration
AVINZA		Sell-through		Prescriptions		November 2017
ONTAK		Sell-through		Wholesaler out-movement		December 2014
Targretin capsules		Sell-through		Wholesaler out-movement		October 2016
Targretin gel		Sell-through		Wholesaler out-movement		October 2016
Panretin		Sell-in		Shipment to wholesaler		August 2016
International		Sell-in		Shipment to international distributor		February 2011 through April 2013

     For the three months ended September 30, 2005 and 2004, net product sales recognized under the sell-through method represented 97% and 96% of total net product sales and net product sales recognized under the sell-in method represented 3% and 4%, respectively. For the nine months ended September 30, 2005 and 2004, net product sales recognized under the sell-through method represented 96% of total net product sales and net product sales recognized under the sell-in method represented 4% of total net product sales in 2005 and 2004.

     Our total net product sales for the three months ended September 30, 2005 were $42.6 million compared to $31.9 million for the same 2004 period. Total net product sales for the nine months ended September 30, 2005 were $119.4 million compared to $86.2 million for the same 2004 period. A comparison of sales by product is as follows (in thousands):

		Three months ended								Nine months ended
		September 30,								September 30,
		2005				2004				2005				2004
						(Restated)								(Restated)
AVINZA		$	29,909			$	20,004			$	79,367			$	47,458
ONTAK			7,370				7,013				24,173				24,290
Targretin capsules			4,394				3,929				13,080				11,482
Targretin gel and Panretin gel			911				988				2,744				2,942
Total product sales		$	42,584			$	31,934			$	119,364			$	86,172

          AVINZA

     Sales of AVINZA were $29.9 million for the three months ended September 30, 2005 compared to $20.0 million for the same 2004 period. For the nine months ended September 30, 2005, sales of AVINZA were $79.4 million compared to $47.5 million for the same 2004 period. The increase in net product sales for the three and nine months ended September 30, 2005 is due to higher prescriptions as a result of the increased level of marketing and sales activity under our co-promotion agreement with Organon, a shift in the mix of prescriptions to the higher doses of AVINZA, and the product’s success in achieving state Medicaid and commercial formulary status. Formulary access removes obstacles to physicians prescribing the product and facilitates patient access to the product through lower co-pays. According to IMS data, quarterly prescription market-share for AVINZA for the three months ended September 30, 2005 was 4.5% compared to 4.2% for the same 2004 period. Since the start of co-promotion activities, AVINZA had been promoted by more than 700 sales representatives compared to approximately 50 representatives in 2003 prior to co-promotion. As a result of a recent sales force restructuring and rebalancing of the Organon AVINZA sales territories, as further discussed above under “Recent Developments”, and the expansion of Ligand’s sales force, four separate sales forces totaling approximately 600 representatives are anticipated to be deployed throughout 2005 to provide more than 800,000 focused sales calls per year to the primary care, specialist, and long-term care and hospice markets.

     For the three and nine months ended September 30, 2005 compared to the same 2004 period, AVINZA sales were negatively impacted by an increase in Medicaid rebates of approximately $1.1 million and $5.5 million, respectively, and an increase in managed care rebates of approximately $0.8 million and $2.5 million, respectively,

under contracts with pharmacy benefit managers (PBMs), group purchasing organizations (GPOs) and health maintenance organizations (HMOs).

     Upon an announced price increase, we revalue our estimate of deferred product revenue to be returned to recognize the potential higher credit a wholesaler may take upon product return determined as the difference between the new price and the previous price used to value the allowance. AVINZA sales for the nine months ended September 30, 2005 reflect an approximate $3.5 million reduction in sales, recorded for the three months ended March 31, 2005, for losses expected to be incurred on product returns resulting from an AVINZA price increase which became effective April 1, 2005. This compares to a $2.6 million loss on product returns for the nine months ended September 30, 2004, which was recorded during the three months ended June 30, 2004 for an AVINZA price increase which became effective July 1, 2004. Lastly, product sales for the three and nine months ended September 30, 2005 and for the three months ended September 30, 2004 are net of fees paid to our wholesaler customers under the fee for service agreements entered into during the third and fourth quarters of 2004.

     Any changes to our estimates for Medicaid prescription activity or prescriptions written under our managed care contracts may have an impact on our rebate liability and a corresponding impact on AVINZA net product sales. For example, a 20% variance to our estimated Medicaid and managed care contract rebate accruals for AVINZA as of September 30, 2005 could result in adjustments to our Medicaid and managed care contract rebate accruals and net product sales of approximately $1.1 million and $0.5 million, respectively.

          ONTAK

     Sales of ONTAK were $7.4 million for the three months ended September 30, 2005 compared to $7.0 million for the same 2004 period. For the nine months ended September 30, 2005, sales of ONTAK were $24.2 million compared to $24.3 million for the same 2004 period. Net product sales for the three and nine months ended September 30, 2005 compared to the same periods in 2004 reflect a 9% price increase effective January 1, 2004, which under the sell-through revenue recognition method does not impact net product sales until the product sells through the distribution channel and therefore only had a limited impact on net sales for the same 2004 periods. Net product sales for the 2004 periods are also net of promotional discounts and amounts paid to wholesalers for marketing support. In connection with the implementation of fee for service agreements in the third quarter of 2004, the Company no longer provides to wholesalers promotional discounts or marketing support payments. Accordingly, sales of ONTAK for the three and nine months ended September 30, 2005 reflect no such discounts compared to approximately $1.4 million and $2.8 million, respectively, for the 2004 periods. The impact of lower discounts and marketing support payments in the 2005 periods on net product sales is partially offset by fees paid to wholesalers under the fee for service agreements for the entire nine months ended September 30, 2005 compared to for only the three months ended September 30, 2004. The increase in net product sales due to the price increase and lower promotional discounts and marketing support was largely offset, however, by a 20% and 10% decrease in wholesaler out-movement for the three and nine months ended September 30, 2005 compared to the same periods in 2004, respectively, due primarily to a decline in the office segment of the market which has been impacted by reimbursement rates. Increases in the hospital segment have not been sufficient to offset the office segment trend. ONTAK sales for the three and nine months ended September 30, 2005 were also negatively impacted by a continued increase in chargebacks and rebates of approximately $0.6 million and $1.1 million, respectively, due to changes in patient mix and evolving reimbursement rates.

     We continue to study changes to the Centers for Medicare and Medicaid Services reimbursement rates. This review continues to indicate increased challenges for a sub-segment of our ONTAK Medicare patients in 2005. We expect that sales of ONTAK will continue to be negatively impacted by changes to the Centers for Medicare and Medicaid Services reimbursement rates in 2005 but expect improved reimbursement rates moving into 2006.

          Targretin capsules

     Sales of Targretin capsules were $4.4 million for the three months ended September 30, 2005 compared to $3.9 million for the same 2004 period. For the nine months ended September 30, 2005, sales of Targretin capsules were $13.1 million compared to $11.5 million for the same 2004 period. This increase reflects a 7% price increase effective January 1, 2004 which under the sell-through revenue recognition method does not impact net product sales until the product sells-through the distribution channel and therefore had only a limited impact on net sales for the same 2004 period. As reported by IMS Health, demand for Targretin capsules, as measured by product outmovement, increased by approximately 4% and 3% for the three and nine months ended September 30, 2005, respectively, compared to the same 2004 periods. Lastly, Targretin capsules product sales for the three and nine months ended September 30, 2005 and the three months ended September 30, 2004 are net of fees paid to our wholesaler customers under the fee for service agreements entered into during the third and fourth quarters of 2004.

     In June 2004, the Centers for Medicare and Medicaid Services (CMS) announced formal implementation of the Section 641 Demonstration Program under the Medicare Modernization Act of 2003 including reimbursement under Medicare for Targretin for patients with CTCL. As a result, we continue to expect improved patient access for Targretin in 2005.

          Collaborative Research and Development and Other Revenues

     Collaborative research and development and other revenues for the three months ended September 30, 2005 were $2.2 million compared to $4.8 million for the same 2004 period. For the nine months ended September 30, 2005, collaborative research and development and other revenues were $8.2 million compared to $10.3 million for the same 2004 period. Collaborative research and development and other revenues include reimbursement for ongoing research activities, earned development milestones, and recognition of prior years’ up-front fees previously deferred in accordance with SAB 104. Revenue from distribution agreements includes recognition of up-front fees collected upon contract signing and deferred over the life of the distribution arrangement and milestones achieved under such agreements.

     A comparison of collaborative research and development and other revenues is as follows (in thousands):

		Three months ended								Nine months ended
		September 30,								September 30,
		2005				2004				2005				2004
Collaborative research and development		$	894			$	1,988			$	2,618			$	6,307
Development milestones and other			1,278				2,850				5,558				3,982
		$	2,172			$	4,838			$	8,176			$	10,289

     Collaborative research and development. The decrease in ongoing research activities reimbursement revenue for the three and nine months ended September 30, 2005 compared to the same 2004 period is due to the termination in November 2004 of our research arrangement with Lilly.

     Development milestones and other. Development milestones revenue and other revenues for the three months ended September 30, 2005 reflects $1.2 million earned from Lilly. For the nine months ended September 30, 2005, development milestones revenue also includes $3.0 million earned from GlaxoSmithKline and $1.1 million from TAP. For the three months ended September 30, 2004, development milestone revenue includes a $2.0 million milestone earned from Pfizer and a $0.8 million milestone earned from TAP. For the nine months ended September 30, 2004, development milestone revenue also includes a $0.8 million milestone from GlaxoSmithKline.

     Gross Margin

     Gross margin on product sales was 77.0% for the three months ended September 30, 2005 compared to 69.3% for the same 2004 period. For the nine months ended September 30, 2005, gross margin on product sales was 73.6% compared to 68.6% for the same 2004 period.

     The increase in the margin for the three and nine months ended September 30, 2005 compared to the same 2004 period is primarily due to the increase in sales of AVINZA. AVINZA represented 70.2% and 66.5% of net product sales for the three and nine months ended 2005 compared to 62.6% and 55.1% for the same 2004 periods, respectively. For both AVINZA and ONTAK we have capitalized license, royalty and technology rights recorded in connection with the acquisition of the rights to those products and accordingly, margins improve as sales of these products increase and there is greater coverage of the fixed amortization of the intangible assets. AVINZA cost of product sold includes the amortization of license and royalty rights capitalized in connection with the restructuring of our AVINZA license and supply agreement in November 2002. The total amount of capitalized license and royalty rights, $114.4 million, is being amortized to cost of product sold on a straight-line basis over 15 years. The total amount of ONTAK acquired technology, $45.3 million, is also amortized to cost of product sold on a straight-line basis over 15 years. ONTAK margins were also positively impacted during the three and nine months ended September 30, 2005 by lower royalties as a result of the partial impact of the restructuring of the Company’s royalty obligation to Lilly as further discussed under “Recent Development – Restructuring of ONTAK Royalty.” This restructuring resulted in no royalty liability owed to Lilly for the three and nine months ended September 30, 2005. This impact was partially offset by amortization of the $33.0 million paid to Lilly as of September 30, 2005 to restructure the ONTAK royalty and the recognition of deferred royalty expense previously paid to Lilly which under the sell-through revenue recognition method is recognized as the related product sales are recognized. The amount paid to restructure the ONTAK royalty is being amortized through 2014, the remaining life of the underlying patent, using the greater of the straight-line method or expense determined based on the tiered royalty schedule set forth under “Restructuring of ONTAK Royalty” above. In accordance with SFAS 142, Goodwill and Other Intangibles (“SFAS 142”), for both AVINZA and ONTAK, capitalized license, royalty and technology rights are amortized on a straight-line basis since the pattern in which the economic benefits of the assets are consumed (or otherwise used up) cannot be reliably determined. At September 30, 2005, acquired technology and products rights, net totaled $150.3 million.

     Gross margins for the nine months ended September 30, 2005 were also favorably impacted by price increases on ONTAK, Targretin capsules and Targretin gel which became effective January 1, 2004 and for AVINZA which became effective July 1, 2004. Under the sell-through revenue recognition method, changes to prices do not impact net product sales and therefore gross margins until the product sells-through the distribution channel. Accordingly, the price increases did not have a significant effect on the margins for the nine months ended September 30, 2004.

     Gross margin for the three and nine months ended September 30, 2005 compared to the same 2004 period was negatively impacted, however, by a higher proportionate level of AVINZA rebates and ONTAK chargebacks and rebates and the costs associated with our wholesaler distribution service agreements as further discussed under “Product Sales.” Additionally, gross margin for the nine months ended September 30, 2005 compared to the same 2004 period was negatively impacted by a $0.5 million write-off of ONTAK finished goods inventory in the quarter ended March 31, 2005, due to the Company’s updated assessment in December 2005 of the timing of certain clinical trials.

     Overall, given the fixed level of amortization of the capitalized AVINZA license and royalty rights, we expect the AVINZA gross margin percentage to continue to increase as sales of AVINZA increase. Additionally, we expect the gross margin on ONTAK to further improve in 2005 due to the lowering of the royalty obligation to Lilly in connection with the restructuring of the ONTAK royalty agreement as further discussed under “Recent Developments.”

Research and Development Expenses

     Research and development expenses were $12.9 million for the three months ended September 30, 2005 compared to $16.7 million for the same 2004 period. For the nine months ended September 30, 2005, research and development expenses were $42.2 million compared to $50.8 million for the same 2004 period. The major components of research and development expenses are as follows (in thousands):

		Three months ended								Nine months ended
		September 30,								September 30,
		2005				2004				2005				2004
						(Restated)								(Restated)
Research
Research performed under collaboration agreements		$	875			$	1,946			$	2,870			$	5,918
Internal research programs			5,074				4,135				15,405				11,836
Total research		$	5,949			$	6,081			$	18,275			$	17,754
Development
New product development			4,156				6,698				15,479				22,153
Existing product support (1)			2,806				3,968				8,416				10,923
Total development		$	6,962			$	10,666			$	23,895			$	33,076
Total research and development		$	12,911			$	16,747			$	42,170			$	50,830

     Spending for research expenses decreased to $5.9 million for the three months ended September 30, 2005 compared to $6.1 million for the same 2004 period. For the nine months ended September 30, 2005, research expenses amounted to $18.3 million compared to $17.8 million for the same 2004 period. The overall increase for the nine months ended September 30, 2005 is due to an increased level of internal program research in the area of thrombopoietin (TPO) agonists. This increase is partially offset by a decrease in research performed under collaboration agreements due primarily to a lower contractual level of research funding under our agreement with TAP and lower research funding under the Lilly collaboration which concluded in November 2004.

     Spending for development expenses decreased to $7.0 million for the three months ended September 30, 2005 compared to $10.7 million for the same 2004 period and to $23.9 million for the nine months ended September 30, 2005 compared to $33.1 million for the same 2004 period. These decreases reflect a lower level of expense for both new product development and existing product support. The decrease in expenses for new product development is due primarily to a reduced level of spending on Phase III clinical trials for Targretin capsules in NSCLC. In March 2005, we announced that the final data analysis for Targretin capsules in NSCLC showed that the trials did not meet their endpoints of improved overall survival and projected two-year survival. We are continuing to analyze the data and apply it to the continued development of Targretin in NSCLC. The decrease in existing product support in 2005 as compared to 2004 is primarily due to lower expenses for Targretin capsules and ONTAK post-marketing regulatory studies.

     As a result of the findings for Targretin capsules in NSCLC, we expect overall development expenses to further decrease in 2005 compared to 2004.

     A summary of our significant internal research and development programs is as follows:

Program		Disease/Indication		Development Phase
AVINZA		Chronic, moderate-to-severe pain		Marketed in U.S.
				Phase IV
ONTAK		CTCL		Marketed in U.S., Phase IV
		Chronic lymphocytic leukemia		Phase II
		Peripheral T-cell lymphoma		Phase II
		B-cell Non-Hodgkin’s lymphoma		Phase II
		NSCLC third line		Phase II
Targretin capsules		CTCL		Marketed in U.S. and Europe
		NSCLC first-line		Phase III
		NSCLC monotherapy		Planned Phase II/III
		NSCLC second/third line		Planned Phase II/III
		Advanced breast cancer		Phase II
		Renal cell cancer		Phase II
Targretin gel		CTCL		Marketed in U.S.
		Hand dermatitis (eczema)		Planned Phase II/III
		Psoriasis		Phase II
LGD4665 (Thrombopoietin oral mimic)		Chemotherapy-induced thrombocytopenia (TCP), other TCPs		IND Track
LGD5552 (Glucocorticoid agonists)		Inflammation, cancer		IND Track
Selective androgen receptor modulators, e.g., LGD3303 (agonist/antagonist)		Male hypogonadism, female & male osteoporosis, male & female sexual dysfunction, frailty. Prostate cancer, hirsutism, acne, androgenetic alopecia.		Pre-clinical

     We do not provide forward-looking estimates of costs and time to complete our ongoing research and development projects, as such estimates would involve a high degree of uncertainty. Uncertainties include our ability to predict the outcome of complex research, our ability to predict the results of clinical studies, regulatory requirements placed upon us by regulatory authorities such as the FDA and EMEA, our ability to predict the decisions of our collaborative partners, our ability to fund research and development programs, competition from other entities of which we may become aware in future periods, predictions of market potential from products that may be derived from our research and development efforts, and our ability to recruit and retain personnel or third-party research organizations with the necessary knowledge and skills to perform certain research. Refer to “Risk Factors” below for additional discussion of the uncertainties surrounding our research and development initiatives.

          Selling, General and Administrative Expense

     Selling, general and administrative expense was $17.8 million for the three months ended September 30, 2005 compared to $17.3 million for the same 2004 period. For the nine months ended September 30, 2005, selling, general and administrative expense was $57.2 million compared to $50.1 million for the same 2004 period. The increase for the three and nine months ended September 30, 2005 is primarily due to costs associated with additional Ligand sales representatives hired to promote AVINZA and higher advertising and promotion expenses for AVINZA, ONTAK and Targretin capsules. The 2005 period also reflects higher accounting and legal expenses incurred in connection with the Audit Committee’s review of the Company’s consolidated financial statements, the restatement of the Company’s consolidated financial statements, and ongoing shareholder litigation. Selling, general and administrative expense is expected to further increase in 2005 due to higher accounting and legal expenses incurred in connection with the restatement of our consolidated financial statements, SEC investigation and shareholder litigation.

          Co-promotion Expense

     Co-promotion expense under our co-promotion arrangement with Organon amounted to $7.8 million for the three months ended September 30, 2005 compared to $8.5 million for the same 2004 period. For the nine months ended September 30, 2005, co-promotion expense was $22.5 million compared to $22.2 million for the same 2004 period. As discussed under “Overview”, prior to the termination of the co-promotion agreement with Organon USA, we paid Organon, under the terms of our co-promotion agreement, 30% of net AVINZA sales, determined in accordance with GAAP and our standard accounting principles up to $150.0 million and higher percentage payments for net sales in excess of $150.0 million. Co-promotion expense recognized for the 2005 and 2004 quarterly periods was determined based upon the Company’s shipments of AVINZA to wholesalers under the sell-in revenue recognition method. However, AVINZA shipments made to wholesalers did not meet the revenue recognition criteria under GAAP and such transactions were restated using the sell-through method. For the three and nine months ended September 30, 2004, net AVINZA product sales under the sell-in method were higher than net product sales under the sell-through method. Accordingly, co-promotion expense for these periods is higher than 30% of the reported net AVINZA product sales under the sell-through method. As previously disclosed, the companies were in discussions regarding the calculation of prior co-promote fees under the co-promotion agreement. In connection with the termination of the co-promotion agreement with Organon, Organon and Ligand resolved their disagreement concerning prior co-promote fees and Ligand paid Organon $14.75 million in January 2006. Such fee was previously accrued at September 30, 2005.

     Restated Results for Fiscal Years 2004, 2003 and 2002

     Total revenues for 2004 increased to $163.5 million compared to $81.1 million in 2003 and $71.8 million in 2002. Loss before the cumulative effect of a change in accounting principle was $45.1 million ($ 0.61 per share) in 2004, compared to $94.5 million ($1.33 per share) in 2003 and $52.3 million ($0.76 per share) in 2002. Net loss for 2004 was $45.1 million ($0.61 per share), compared to $96.5 million ($1.36 per share) in 2003 and $52.3 million ($0.76 per share) in 2002. As more fully described in Note 3 of the notes to consolidated financial statements, results for 2003 reflect the implementation of FASB Interpretation No. 46, Consolidation of Variable Interest Entities, an interpretation of ARB No. 51, as revised December 2003, which required us to consolidate the entity from which we leased one of our corporate office buildings under a synthetic lease arrangement. The effect on 2003 results, recorded as a cumulative effect of a change in accounting principle, increased net loss by $2.0 million or $0.03 per share.

          Product Sales

     Our product sales for any individual period can be influenced by a number of factors including changes in demand for a particular product, competitive products, the level and nature of promotional activity, the timing of announced price increases, and the level of prescriptions subject to rebates and chargebacks. According to IMS data, AVINZA ended 2004 with a market share of prescriptions in the sustained-release opioid market of 3.9% compared to 1.4% at the end of 2003. Quarterly prescription market share for the three months ended December 31, 2004 was 4.3% compared to 2.7% for the three months ended December 31, 2003. We expect that AVINZA prescription market share will continue to increase as a result of a more balanced and focused sales and marketing activity compared to 2004. We also continue to expect that demand for and sales of ONTAK will be positively impacted as further data is obtained from ongoing expanded-use clinical trials and the initiation of new expanded-use trials but negatively impacted by continuing reimbursement trends resulting from changes to the Centers for Medicare and Medicaid Services reimbursement rates. The level and timing of any such increases, however, are influenced by a number of factors outside our control, including the accrual of patients and overall progress of clinical trials that are managed by third parties.

     Excluding AVINZA, our products are small-volume specialty pharmaceutical products that address the needs of cancer patients in relatively small niche markets with substantial geographical fluctuations in demand. To ensure patient access to our drugs, we maintain broad distribution capabilities with inventories held at approximately 150 locations throughout the United States. The purchasing and stocking patterns of our wholesaler customers for all our products are influenced by a number of factors that vary from product to product. These factors include, but are not limited to, overall level of demand, periodic promotions, required minimum shipping quantities and wholesaler competitive initiatives. If any or all of our major wholesalers decide to reduce the inventory they carry in a given

period (subject to the terms of our fee-for-service agreements discussed below), our shipments and cash flow for that period could be substantially lower than historical levels.

     In the third and fourth quarters of 2004, we entered into one-year fee-for-service agreements (or distribution service agreements) for each of our products with the majority of our wholesaler customers. The principal fee-for-service agreements were subsequently renewed during the third quarter of 2005. In exchange for a set fee, the wholesalers have agreed to provide us with certain information regarding product stocking and out-movement; agreed to maintain inventory quantities within specified minimum and maximum levels; inventory handling, stocking and management services; and certain other services surrounding the administration of returns and chargebacks. In connection with implementation of the fee-for-service agreements, we no longer offer these wholesalers promotional discounts or incentives and as a result, we expect a net improvement in product gross margins as volumes grow. Additionally, we believe these arrangements will provide lower variability in wholesaler inventory levels and improved management of inventories within and between individual wholesaler distribution centers that we believe will result in a lower level of product returns compared to prior periods.

     Certain of our products are included on the formularies (or lists of approved and reimbursable drugs) of many states’ health care plans, as well as the formulary for certain Federal government agencies. In order to be placed on these formularies, we generally sign contracts which provide discounts to the purchaser off the then-current list price and limit how much of an annual price increase we can implement on sales to these groups. As a result, the discounts off list price for these groups can be significant for products where we have implemented list price increases. We monitor the portion of our sales subject to these discounts, and accrue for the cost of these discounts at the time of the recognition of product sales. We believe that by being included on these formularies, we will gain better physician acceptance, which will then result in greater overall usage of our products. If the relative percentage of our sales subject to these discounts increases materially in any period, our sales and gross margin could be substantially lower than historical levels.

     Our total net product sales for 2004 were $120.3 million, compared to $55.3 million in 2003 and $30.3 million in 2002. A comparison of sales by product is as follows (in thousands):

		Year Ended December 31,
		2004				2003				2002
						(Restated)				(Restated)
AVINZA		$	69,470			$	16,482			$	1,114
ONTAK			32,200				24,108				17,706
Targretin capsules			15,105				11,556				8,563
Other			3,560				3,178				2,943
Total product sales		$	120,335			$	55,324			$	30,326

          AVINZA

     Sales of AVINZA were $69.5 million in 2004 compared to $16.5 million in 2003. This increase is due to higher prescriptions as a result of the increased level of marketing and sales activity under our co-promotion agreement with Organon, which started in March 2003, and the product’s success in achieving state Medicaid and commercial formulary status. Formulary access removes obstacles to physicians prescribing the product and facilitates patient access to the product through lower co-pays. Demand for AVINZA as measured by prescription levels (or patient consumption for channels with no prescription requirements) increased by 235.6% for 2004 compared to 2003, as reported by IMS Health. Sales in 2004 also benefited from a 9.9% price increase effective January 1, 2004 and a 9.0% price increase effective July 1, 2004. Since the start of co-promotion activities, AVINZA had been promoted by more than 700 sales representatives compared to approximately 50 representatives in 2003 prior to co-promotion. However, as a result of a recent sales force restructuring and rebalancing of the Organon AVINZA sales territories, as further discussed above under “Recent Developments”, and the expansion of Ligand’s sales force, four separate sales forces totaling approximately 600 representatives are anticipated to be deployed in 2005 to provide more than 800,000 focused sales calls per year to the primary care, specialist, and long-term care and hospice markets.

     AVINZA sales were negatively impacted during 2004 by an increase in Medicaid rebates of approximately $11.3 million, which significantly increased in the fourth quarter of 2003, driven by increased prescriptions in states

where AVINZA (1) obtained preferred formulary status relative to competing products and (2) came onto the state formulary but not in a preferred position. AVINZA sales during 2004 compared to 2003 were also impacted by an increase in managed care rebates of approximately $4.6 million under contracts entered into in late 2003 and early 2004 with pharmacy benefit managers (PBMs), group purchasing organizations (GPOs) and health maintenance organizations (HMOs). Any changes to our estimates for Medicaid prescription activity or prescriptions written under our managed care contracts may have an impact on our rebate liability and a corresponding impact on AVINZA net product sales. For example, a 20% variance to our estimated Medicaid and managed care contract rebate accruals for AVINZA as of December 31, 2004 could result in adjustments to our Medicaid and managed care contract rebate accruals and net product sales of approximately $0.9 million and $0.3 million, respectively.

     Sales of AVINZA were $16.5 million in 2003 compared to $1.1 million in 2002. This increase is due to increasing prescriptions as a result of the increased level of marketing and sales activity under our co-promotion arrangement with Organon, and to 2003 being the first full year of AVINZA sales. Demand for AVINZA as measured by prescription levels (or patient consumption for channels with no prescription requirements) was 17 times greater for 2003 than for 2002, as reported by IMS Health. Sales of AVINZA in 2003 compared to 2002 were negatively impacted, however, by an increase in Medicaid rebates of approximately $1.7 million and an increase in rebates under managed care contracts of approximately $0.8 million.

          ONTAK

     Sales of ONTAK were $32.2 million in 2004 compared to $24.1 million in 2003. Sales in 2004 were positively impacted by a 9% price increase effective January 1, 2004 and increasing use (impacted in part by expanded clinical data) in CTCL, CLL, and NHL. Demand for ONTAK as measured by shipments to end users as reported by our wholesalers increased by 28% for 2004 compared to 2003. Sales of ONTAK in 2004 were negatively impacted, however, by a continued increase in chargebacks and rebates of approximately $1.9 million due to changes in patient mix and evolving reimbursement rates. We expect that sales of ONTAK will be negatively impacted by changes to the Centers for Medicare and Medicaid Services reimbursement rates in 2005 but expect improved reimbursement rates moving into 2006. A 20% variance to our Medicaid rebate and estimated chargeback accruals for ONTAK as of December 31, 2004 could result in an adjustment to such accruals and net product sales of approximately $0.1 million.

     Sales of ONTAK were $24.1 million in 2003 compared to $17.7 million in 2002. This increase reflects price increases and increasing use (impacted in part by expanded clinical data) in CTCL, CLL, and NHL. Overall demand for ONTAK measured by unit shipments to end users increased 20% for 2003 compared to the prior year. Sales of ONTAK were negatively impacted, however, by increased chargebacks and rebates of approximately $0.8 million reflecting changes in our patient mix and reimbursement rates.

          Targretin Capsules

     Sales of Targretin capsules were $15.1 million in 2004 compared to $11.6 million in 2003. This increase reflects a 7% price increase effective January 1, 2004 and the full period impact of a 15% price increase effective April 1, 2003. Additionally, demand for Targretin capsules as measured by product outmovement increased by 5.4% for 2004 compared to 2003, as reported by IMS Health.

     In June 2004, the Centers for Medicare and Medicaid Services (CMS) announced formal implementation of the Section 641 Demonstration Program under the Medicare Modernization Act of 2003 including reimbursement under Medicare for Targretin for patients with CTCL. As a result, we continue to expect improved patient access for Targretin in 2005.

     Sales of Targretin capsules were $11.6 million in 2003 compared to $8.6 million in 2002. This increase reflects a 15% price increase effective April 1, 2003. Additionally, demand for Targretin capsules as measured by product outmovement increased by 1.0% for 2003 compared to 2002, as reported by IMS Health.

          Sale of Royalty Rights

     Revenue from the sale of royalty rights represents the sale to third parties of rights and options to acquire future royalties we may earn from the sale of products in development with our collaborative partners. In those instances where we have no continuing involvement in the research or development of these products, sales of royalty rights are recognized as revenue in the period the transaction is consummated or the options are exercised or expire. See Footnote 3 “Significant Accounting Policies” of Notes to Consolidated Financial Statements for further discussion of our revenue recognition policy with respect to sales of royalty rights.

     Sale of royalty rights recognized in 2004, 2003 and 2002 amounted to $31.3 million, $11.8 million, and $17.6 million, respectively, net of the deferral of offset rights of $1.4 million, $0.6 million and $0.6 million, respectively, and the recognition in 2004 and 2003 of $0.2 million and $0.1 million, respectively, of option value deferred in previous periods.

     In March 2002, we entered into an agreement with Royalty Pharma AG (“Royalty Pharma”), to sell a portion of our rights to future royalties from the net sales of three selective estrogen receptor modulator (SERM) products now in late stage development with two of our collaborative partners, Pfizer and Wyeth. The agreement provided for the initial sale of rights to 0.25% of such product net sales for $6.0 million and options to acquire up to an additional 1.00% of net sales for $50.0 million. Of the initial $6.0 million sale of rights, $0.2 million was attributed to the options and recorded as deferred revenue.

     In July and December of 2002, the agreement was amended to replace the existing options with new options providing for the rights to acquire an additional 1.3125% of net sales for $63.8 million. Royalty Pharma exercised each of the three available 2002 options, as amended, acquiring rights to 0.4375% of net sales for $12.3 million. The fair value estimated for the amended options, $0.2 million, was recorded as deferred revenue.

     In October 2003, the existing royalty agreement was amended and Royalty Pharma exercised an option for $12.5 million in exchange for 0.7% of potential future sales of the three SERM products for 10 years. Under the revised agreement, Royalty Pharma had three additional options to purchase up to 1.3% of such product net sales for $39.0 million.

     In November 2004, Royalty Pharma agreed to purchase an additional 1.625% royalty on future sales of the SERM products for $32.5 million and cancel its remaining two options.

     Under the underlying royalty agreements, both Pfizer and Wyeth have the right to offset a portion of any future royalty payments owed to the Company. Accordingly, the Company deferred a portion of the revenue associated with each tranche of royalty right sold, including rights acquired upon the exercise of options, equal to the pro-rata share of the potential royalty offset. Such amounts associated with the offset rights against future royalty payments will be recognized as revenue upon receipt of future royalties from the respective partners.

          Collaborative Research and Development and Other Revenue

     Collaborative research and development and other revenues for 2004 were $11.8 million, compared to $14.0 million for 2003 and $23.8 million for 2002. Collaborative research and development and other revenues include reimbursement for ongoing research activities, earned development milestones, and recognition of prior years’ up-front fees previously deferred in accordance with SAB 104. Revenue from distribution agreements includes recognition of up-front fees collected upon contract signing and deferred over the life of the distribution arrangement and milestones achieved under such agreements.

     A comparison of collaborative research and development and other revenues is as follows (in thousands):

		Year Ended December 31,
		2004				2003				2002
Collaborative research and development		$	7,843			$	10,887			$	18,268
Development milestones			3,681				2,807				5,060
Other			311				314				515
		$	11,835			$	14,008			$	23,843

     Collaborative Research and Development. The decrease in ongoing research activities reimbursement revenue in 2004 compared to 2003 is due to lower funding from our research arrangement with Lilly, which contributed $4.0 million to revenue in 2004 compared to $5.7 million in 2003. The research term of the Lilly collaboration was extended for an additional year effective November 2003 at a lower level of funding, through November 2004. Additionally, the decrease is due to the contractually agreed lower level of research activity and funding under our collaboration arrangement with TAP, which contributed $3.4 million to revenue in 2004 compared to $4.2 million in 2003. In December 2004, the TAP collaboration was extended for a second time, until June 2006.

     The decrease in ongoing research activities reimbursement revenue in 2003 compared to 2002 is due to lower funding from our research arrangement with Lilly, which contributed $5.7 million to revenue in 2003 compared to $8.2 million in 2002. Additionally, the decrease is due to the contractually agreed lower level of research activity and funding under our research arrangement with TAP, which contributed $4.2 million to revenue in 2003 compared to $5.0 million in 2002.

     Revenue from up-front fees, which is included in collaborative research and development, is recognized over the period during which we provide research services. Revenue from TAP up-front fees decreased to $0.4 million in 2004 from $1.0 million in 2003 and from $1.3 million in 2002. Revenue from Lilly up-front fees was $3.4 million in 2002 and none thereafter, due to the completion of the initial research term of the Lilly collaboration.

     Development Milestones. Development milestone revenue in 2004 includes net development milestones of $2.0 million from Pfizer as a result of Pfizer’s filing with the FDA of a new drug application for lasofoxifene, $0.8 million earned from TAP in connection with TAP’s selection of an additional selective androgen receptor modulator (SARM) as a second clinical candidate for development for the treatment of major androgen-related diseases, and $0.8 million earned from GlaxoSmithKline.

     Development milestone revenue in 2003 represents $0.9 million earned from Wyeth, a $1.1 million milestone from Lilly, and a $0.8 million milestone from GlaxoSmithKline. Development milestone revenue in 2002 represents a $2.4 million milestone from Lilly, $0.6 million earned from Wyeth, and a $2.0 million milestone from GlaxoSmithKline.

          Gross Margin

     Gross margin on product sales was 66.9% in 2004 compared to 52.0% in 2003 and 51.4% in 2002. The increase in the margin in 2004 compared to 2003 is primarily due to the relative increase of sales of AVINZA. AVINZA, which represented 58% of net product sales in 2004 compared to 30% in the prior year, has significantly higher margins than ONTAK for which we owed third party royalties of approximately 27% of ONTAK product sales. For both AVINZA and ONTAK we have capitalized license, royalty and technology rights recorded in connection with the acquisition of the rights to those products. AVINZA cost of product sold includes the amortization of license and royalty rights capitalized in connection with the restructuring of our AVINZA license and supply agreement in November 2002. The total amount of capitalized license and royalty rights, $114.4 million, is being amortized to cost of product sold on a straight-line basis over 15 years. The total amount of ONTAK acquired technology, $45.3 million, is also amortized to cost of product sold on a straight-line basis over 15 years. In accordance with SFAS 142, “Goodwill and Other Intangibles” (“SFAS 142”), these assets are amortized on a straight line basis since the pattern in which the economic benefits of the assets are consumed (or otherwise used up) cannot be reliably determined. At December 31, 2004, acquired technology and product rights net totaled $127.4 million.

     Gross margin in 2004 was also favorably impacted by price increases on our products which became effective January 1, 2004 and July 1, 2004 and a lower level of promotional discounts paid to the Company’s wholesaler customers. As discussed, under “Product Sales”, in the third and fourth quarters of 2004, we entered into distribution service agreements with the majority of our wholesaler customers. In connection with the implementation of these agreements, we no longer offer wholesalers promotional discounts or incentives.

     Lastly, the cost of AVINZA product sold in 2004 reflects the full-year impact of a reduction to the pricing of AVINZA purchases from Elan which occurred in prior periods. In November 2002, the Company and Elan agreed to amend the terms of the AVINZA license and supply agreement. Under the terms of the amended agreement, Elan’s adjusted royalty and supply price of AVINZA was reduced to approximately 10% of the product’s net sales, compared to approximately 30-35% in the prior agreement. Under the sell-through revenue recognition model, product shipped to the wholesaler is recorded as “deferred cost of goods sold” and subsequently recognized as cost of sales when it sells-through. Accordingly, the majority of product manufactured by Elan in 2002 at the higher contractual cost of production sold-through and was recognized as cost of sales in 2003. As a result, AVINZA gross margins for 2003 under sell-through revenue recognition reflect this higher product cost compared to cost of product sold in 2004.

     Gross margin in 2004 compared to 2003 was negatively impacted, however, by a higher proportionate level of AVINZA rebates and ONTAK chargebacks and rebates and the costs associated with our wholesaler distribution service agreements as further discussed under “Product Sales.” Additionally, gross margin in 2004 reflects a charge to royalty expense in the amount of $3.0 million, recorded in the fourth quarter of 2004, for deferred royalties at the end of the contracted royalty period for which we did not have offset rights. Under the sell-through revenue recognition method, royalties paid based on unit shipments to wholesalers are deferred and recognized as royalty expense as those units are sold through and recognized as revenue. Royalties paid to technology partners are deferred as we have the right to offset royalties paid for product that are later returned against subsequent royalty obligations. Royalties for which we do not have the right to offset, however, (for example, at the end of the contracted royalty period) are expensed in the period the royalty obligation becomes due.

     Gross margin on product sales was 52.0% in 2003 compared to 51.4% in 2002. The increase in the margin reflects a lower proportionate level of ONTAK sales in 2003. ONTAK has lower overall margins than our other oncology products due to a higher royalty rate owed to third party technology partners. Gross margins also improved in 2003 as a result of a higher absolute level of ONTAK sales which resulted in a higher base to absorb the fixed amortization of the ONTAK acquired technology. This increase was largely offset by a higher proportionate level of AVINZA sales in 2003 compared to 2002 when the product was launched. The cost of the majority of AVINZA products recognized in 2003 was manufactured in 2002 under the terms of the existing license and supply agreement with Elan, which provided for a cost of production of approximately 30-35% of the product’s net sales. This cost was significantly higher than the manufacturing cost of our other products.

     Overall, given the fixed level of amortization of the capitalized AVINZA license and royalty rights, we expect the AVINZA gross margin percentages in 2005 to continue to increase as sales of AVINZA increase.

          Research and Development Expenses

     Research and development expenses were $65.2 million in 2004 compared to $66.7 million in 2003 and $59.1 million in 2002. The major components of research and development expenses are as follows (in thousands):

		Year Ended December 31,
		2004				2003				2002
						(Restated)				(Restated)
Research
Research performed under collaboration agreements		$	7,853			$	10,535			$	14,906
Internal research programs			15,517				12,013				9,990
Total research			23,370				22,548				24,896
Development
New product development			28,329				30,771				20,518
Existing product support (1)			13,505				13,359				13,646
Total development			41,834				44,130				34,164
Total research and development		$	65,204			$	66,678			$	59,060

     Overall, spending for research expenses remained relatively constant in 2004 compared to 2003, with increases in expenses for internal research programs offset by decreases in expenses for research performed under collaboration agreements. The decrease in expenses for research performed under collaboration agreements was due primarily to a lower contractual level of research funding under our agreement with TAP and a lower level of research funding agreed to with Lilly in connection with the November 2003 extension of our collaboration agreement through November 2004. The increase in internal research program expenses in 2004 compared to the 2003 period reflects an increased level of effort in the areas of thrombopoietin (TPO) agonists and peroxisome proliferation activated receptors (PPARs). The level of effort on selective androgen receptor modulators (SARMs) remained constant in 2004 as compared to 2003.

     Spending for development expenses decreased to $41.8 million in 2004 compared to $44.1 million in 2003 reflecting a lower level of expense for new product development. The decrease in expenses for new product development is due primarily to a reduced level of spending on Phase III clinical trials for Targretin capsules in NSCLC, which became fully enrolled in 2003. In March 2005, we announced that the final data analysis for Targretin capsules in NSCLC showed that the trials did not meet their primary endpoints of improved overall survival and projected two-year survival. We are continuing to analyze the data and apply it to the continued development of Targretin in NSCLC. As a result of these findings, we expect the overall spending on the NSCLC trials to further decrease in 2005. The decrease in 2004 as compared to 2003 is partially offset by a $1.1 million payment to The Salk Institute in March 2004 to buy out milestone payments, other payment sharing obligations and royalty payments due on future sales of lasofoxifine, a product under development by Pfizer. Pfizer filed an NDA for lasofoxifene with the FDA in August 2004.

     The overall increase in research and development expenses in 2003 compared to 2002 is primarily due to development funding of Phase III clinical trials for Targretin capsules in NSCLC. This increase was partially offset by a lower level of research funding agreed to with Lilly in connection with the two one-year extensions of our collaboration agreements through November 2004. This lower level of funding resulted in lower research expenses performed under collaboration agreements by approximately $4.4 million in 2003 compared to 2002.

     We expect overall development expenses to be the same or lower in 2005 due to lower expenses for the completed NSCLC Phase III trials as discussed above, partially offset by higher expense for AVINZA clinical trials and development of our thrombopoietin oral mimic (TPO) compound.

     A summary of our significant internal research and development programs is as follows:

Program		Disease/Indication		Development Phase
AVINZA		Chronic, moderate-to-severe pain		Marketed in U.S.
				Phase IV
ONTAK		CTCL		Marketed in U.S., Phase IV
		Chronic lymphocytic leukemia		Phase II
		Peripheral T-cell lymphoma		Phase II
		B-cell Non-Hodgkin’s lymphoma		Phase II
		NSCLC third line		Phase II
Targretin capsules		CTCL		Marketed in U.S. and Europe
		NSCLC first-line		Phase III
		NSCLC monotherapy		Planned Phase II/III
		NSCLC second/third line		Planned Phase II/III
		Advanced breast cancer		Phase II
		Renal cell cancer		Phase II
Targretin gel		CTCL		Marketed in U.S.
		Hand dermatitis (eczema)		Planned Phase II/ III
		Psoriasis		Phase II
LGD4665 (Thrombopoietin oral mimic)		Chemotherapy-induced thrombocytopenias (TCP), other TCPs		IND Track
LGD5552 (Glucocorticoid agonists)		Inflammation, cancer		IND Track
Selective androgen receptor modulator, e.g., LGD3303 (agonist/antagonist)		Male hypogonadism, female & male osteoporosis, male & female sexual dysfunction, frailty. Prostate cancer, hirsutism, acne, androgenetic alopecia.		Pre-clinical

     A summary of our significant internal research and development programs is as follows:

     We do not provide forward-looking estimates of costs and time to complete our ongoing research and development projects, as such estimates would involve a high degree of uncertainty. Uncertainties include our ability to predict the outcome of complex research, our ability to predict the results of clinical studies, regulatory requirements placed upon us by regulatory authorities such as the FDA and EMEA, our ability to predict the decisions of our collaborative partners, our ability to fund research and development programs, competition from other entities of which we may become aware in future periods, predictions of market potential from products that may be derived from our research and development efforts, and our ability to recruit and retain personnel or third-party research organizations with the necessary knowledge and skills to perform certain research. Refer to the “Risks and Uncertainties” section for additional discussion of the uncertainties surrounding our research and development initiatives.

          Selling, General and Administrative Expenses

     Selling, general and administrative expenses were $65.8 million for 2004 compared to $52.5 million for 2003 and $41.8 million for 2002. The increase in 2004 is primarily due to costs associated with 36 additional Ligand sales representatives hired to promote AVINZA as further discussed under “Recent Developments – Sales Force Activity/Realignment” above, and higher advertising and promotion expenses for AVINZA in connection with our co-promotion activities with Organon which started in March 2003. The 36 additional sales representatives were hired in the second and third quarters of 2004 resulting in higher expenses in the third and fourth quarters of 2004 compared to the first two quarters of 2004 and the full year of 2003. Marketing expenses also increased in 2004 as a result of our increased emphasis on physician-attended product information and advisory meetings for AVINZA. Additionally, selling, general and administrative expenses reflect increased costs incurred in 2004 in connection with the development of an alternate source of supply (Cardinal Health PGS LLC or “Cardinal”) for AVINZA. See further discussion of our agreement with Cardinal under “Liquidity and Capital Resources — Contractual Obligations.”

     The increase in 2003 compared to 2002 is primarily due to costs associated with additional Ligand sales representatives hired to promote AVINZA and higher advertising and promotion expenses for AVINZA which was launched in June 2002. Additionally, marketing expenses increased in 2003 in connection with our increased emphasis on physician-attended product information and advisory meetings for our oncology products. Selling, general and administrative expense for 2003 also includes a $0.7 million interest accrual recorded in the fourth quarter of 2003 for a legal judgment against the Company, related to ongoing litigation with Boston University resulting from amounts withheld from Boston University in connection with the Company’s 1998 acquisition of Seragen. We continue to believe that the plaintiff’s claims are without merit and have appealed the judgment in this case as well as the award of interest and the calculation of damages. The appeal has been fully briefed and was argued in June 2005 and the parties are awaiting the court’s decision.

     Selling, general and administrative expenses are expected to increase in 2005 due to the full year impact of hiring of an additional 36 pain specialist sales representatives as discussed above. Additionally, 2005 expenses will increase due to significantly higher accounting and legal expenses incurred in connection with the restatement of our consolidated financial statements, SEC investigation and shareholder litigation as more fully discussed above under “The Restatement and Other Related Matters.”

          Co-promotion Expense

     Co-promotion expense payable to Organon amounted to $30.1 million in 2004 compared to $9.4 million for 2003. As discussed under “Overview”, prior to the termination of the co-promotion agreement with Organon USA, we paid Organon, under the terms of our co-promotion agreement, 30% of net AVINZA sales, determined in accordance with GAAP and our standard accounting principles up to $150.0 million and higher percentage payments for net sales in excess of $150.0 million. For 2003, we were required to pay Organon 30% of net AVINZA sales in excess of $35.0 million. Co-promotion expense recognized for 2004 and 2003 was determined based upon the Company’s shipments of AVINZA to wholesalers under the sell-in revenue recognition method. Sell-in AVINZA revenue recognized for 2004 and 2003 was $100.3 million and $66.2 million, respectively. For 2003, the co-promotion expense of $9.4 million was recorded in the fourth quarter, the period in which sell-in revenues exceeded the $35.0 million threshold. However, AVINZA shipments made to wholesalers did not meet the revenue recognition criteria under GAAP and such transactions were restated using the sell-through method. See “- — Results of Operation – Three and Nine Months Ended September 30, 2005 and September 30, 2004 – Co-promotion Expense.”

          Other Expenses, Net

     Other expenses, net were $7.5 million for 2004 compared to $20.4 million for 2003 and $8.4 million for 2002. Interest expense increased to $12.3 million for 2004 compared to $11.1 million for 2003 and $6.3 million for 2002. Interest expense in 2004 and 2003 primarily represents interest on the $155.3 million of 6% convertible subordinated notes that we issued in November 2002. The increase in interest expense in 2004 compared to the prior year is due primarily to interest on a note payable secured by one of our corporate office buildings and was partially offset by factoring expense attributable to our accounts receivable factoring arrangement (as more fully discussed in Note 6 to the annual consolidated financial statements included elsewhere in this prospectus).

     Effective December 31, 2003, the entity from which we leased the building (Nexus Equity VI LLC or “Nexus”) was consolidated in connection with the implementation of FIN 46(R) “Consolidation of Variable Interest Entities, an interpretation of Accounting Research Bulletin No. 51.” Prior to that, the lease arrangement with Nexus was treated as an operating lease. We subsequently acquired the portion of Nexus we did not previously own in April 2004.

     The 2002 interest expense represents interest on the $20.0 million in issue price of zero coupon convertible senior notes that were converted into common stock in March 2002 and interest on our outstanding $50.0 million face value of convertible subordinated debentures that were redeemed in June 2002. The increase in interest expense in 2003 compared to 2002 is partially offset by the reduction in debt conversion expense of which $2.0 million was incurred in March 2002 in connection with the early conversion of $20.0 million in issue price of zero coupon convertible senior notes into common stock.

     In 2004, Other, net reflects income of $3.7 million compared to net expenses of $10.0 million in 2003. In September 2004, we agreed to vote our shares of X-Ceptor in favor of the acquisition of X-Ceptor by Exelixis Inc. (“Exelixis”). Exelixis’ acquisition of X-Ceptor was subsequently completed on October 18, 2004 and in connection therewith, Ligand received shares of Exelixis common stock. The shares were restricted securities for which a resale registration statement has been filed. Such shares are subject to trading restrictions for up to two years. Additionally, approximately 21% of the shares were placed in escrow for up to one year to satisfy indemnification and other obligations. We recorded a net gain on the transaction in the fourth quarter of 2004 of approximately $3.7 million, based on the fair market value of the consideration received.

     Other, net expenses of $10.0 million in 2003 include the March 2003 write-off of a $5.0 million one-time payment made in July 2002 to X-Ceptor Therapeutics, Inc., or X-Ceptor, to extend Ligand’s right to acquire the outstanding stock of X-Ceptor not already held by Ligand. In March 2003, we informed X-Ceptor that we would not exercise the purchase right and wrote-off the purchase right valued at $4.0 million that was recorded in 1999.

          Cumulative Effect of Accounting Change

     In January 2003, the Financial Accounting Standards Board (“FASB”) issued FASB Interpretation No. 46 (“FIN 46”), Consolidation of Variable Interest Entities, an interpretation of ARB No. 51, which was subsequently revised in December 2003 (“FIN 46(R)”). FIN 46(R) requires the consolidation of certain variable interest entities (“VIEs”) by the primary beneficiary of the entity if the equity investment at risk is not sufficient to permit the entity to finance its activities without additional subordinated financial support from other parties, or if the equity investors lack the characteristics of a controlling financial interest.

     We implemented FIN 46(R) effective December 31, 2003, and consolidated the entity from which we lease one of our two corporate office buildings as of that date, as we determined that the entity is a VIE, as defined by FIN 46(R), and that we would absorb a majority of its expected losses if any, as defined by FIN 46(R). Accordingly, we consolidated the assets of the entity, which consist of land, the building, and related tenant improvements, with a total carrying value of $13.6 million, net of accumulated depreciation. Additionally, we consolidated the entity’s debt of $12.5 million and non-controlling interest of $0.6 million. In connection with the implementation of FIN 46(R), we also recorded a $2.0 million charge ($0.03 per share) as a cumulative effect of the accounting change on December 31, 2003.

          Income Taxes

     Income tax expense was $0.2 million for 2004 compared to approximately $0.1 million for each of 2003 and 2002. At December 31, 2004, we have both federal and state net operating loss carryforwards of approximately $530.2 million and $94.1 million, respectively, which will begin expiring in 2005. The difference between the federal and California tax loss carryforwards is primarily due to the capitalization of research and development expenses for California income tax purposes and the 50% to 60% limitation on losses incurred prior to 2004 in California. We have $25.0 million of federal research and development credits carryforwards which will expire beginning in 2005, and $13.7 million of California research and development credits that have no expiration date.

     Pursuant to Internal Revenue Code Sections 382 and 383, use of a portion of net operating loss and credit carryforwards will be limited because of cumulative changes in ownership of more than 50% that occurred within three periods during 1989, 1992 and 1996. In addition, use of Glycomed’s and Seragen’s preacquisition tax net operating and credit carryforwards will also be limited because the acquisitions by the Company represent changes in ownership of more than 50%. Such tax net operating loss and credit carryforwards have been reduced, including the related deferred tax assets. In addition, it is possible that we have had subsequent changes in ownership since 1996 that could further limit our net operating loss and credit carryforwards generated during that period. We have not determined whether any such cumulative ownership change has occurred and if so, the extent of any resulting carryforward limitations. The Company’s research & development credits pertain to federal and California jurisdictions. These jurisdictions require that the Company create minimum documentation and support, such as done via a “Research & Development Credit Study.” In the absence of sufficient documentation and support these government jurisdictions may disallow some or all of the credits. Although the Company has not performed a formal study, the Company believes that it maintains sufficient documentation to support the benefitting of the credits in the

consolidated financial statements. Prior to utilizing a significant portion of the credits to reduce taxes payable, the Company will review its documentation and support to determine if a formal study is necessary.

          Liquidity and Capital Resources

     We have financed our operations through private and public offerings of our equity securities, collaborative research and development and other revenues, issuance of convertible notes, product sales, capital and operating lease transactions, accounts receivable factoring and equipment financing arrangements and investment income.

     Working capital was a deficit of $106.9 million at September 30, 2005 compared to a deficit of $48.5 million at December 31, 2004. Cash, cash equivalents, short-term investments, and restricted investments totaled $75.6 million at September 30, 2005 compared to $114.9 million at December 31, 2004. We primarily invest our cash in United States government and investment grade corporate debt securities. Restricted investments consist of certificates of deposit held with a financial institution as collateral under equipment financing and third-party service provider arrangements.

          Operating Activities

     Operating activities used cash of $3.7 million for the nine months ended September 30, 2005 compared to $23.4 million for the same 2004 period. Operating activities for 2005 reflect a lower net loss adjusted by $2.2 million of higher amortization of acquired technology and license rights resulting from the capitalization of $33.0 million paid to Lilly in connection with the restructuring of the Company’s ONTAK royalty agreement. Additionally, the net loss for the 2004 period includes a $2.0 million non-cash development milestone earned from Pfizer in the third quarter of 2004. The lower use of cash for the 2005 period also reflects changes in operating assets and liabilities primarily due to an increase in deferred revenue, net of $5.5 million, an increase in accounts payable and accrued liabilities of $2.3 million, a decrease in accounts receivable, net of $6.5 million, and a decrease in other current assets of $5.0 million partially offset by an increase in inventories, net of $3.1 million. For the same 2004 period, use of operating cash was impacted by changes in operating assets and liabilities primarily due to an increase in deferred revenue, net of $35.6 million, an increase in accounts payable and accrued liabilities of $11.2 million partially offset by an increase in accounts receivable, net of $11.6 million, an increase in inventories, net of $3.1 million, and an increase in other current assets of $2.6 million.

     Operating activities provided cash of $5.8 million in 2004 and $0.3 million in 2003 and used cash of $26.9 million in 2002. Operating cash flow in 2004 benefited from increased product sales and $32.5 million of cash received in connection with the sale to Royalty Pharma AG of rights to future royalties from certain collaborative partners’ net sales of three SERM products compared to cash received in 2003 of $12.5 million for royalty rights sales. Operating cash was negatively impacted, however, by higher operating expenses including development expenses to fund clinical trials of our existing products in new indications including Phase III registration trials for Targretin capsules in NSCLC, and higher selling and marketing expenses for AVINZA.

     Non-cash operating items in 2004 decreased $17.2 million compared to 2003. The decrease includes a development milestone of approximately $2.0 million received from Pfizer, in connection with Pfizer’s filing with the FDA of a new drug application for lasofoxifene, paid in stock in September 2004. Non-cash activity in 2004 also includes a net gain on sale of equity investments totaling $3.7 million. Non-cash operating items in 2003 include the $9.0 million write-off of the $5.0 million X-Ceptor payment to extend our X-Ceptor purchase right and capitalization of the purchase right of $4.0 million in March 2003, in connection with our decision to not acquire X-Ceptor, and the non-cash cumulative effect of the change in accounting principle (approximately $2.0 million) recognized in connection with the implementation of FIN 46(R).

     Changes in operating assets and liabilities provided cash of $41.2 million in 2004 primarily due to increases in deferred revenue of $47.9 million and accounts payable and accrued liabilities of $9.8 million, partially offset by increases in accounts receivable and inventories of $11.9 million and $3.3 million, respectively. This compares to cash provided by changes in operating assets and liabilities in 2003 of $69.9 million due to increases in deferred revenue of $57.0 million and accounts payable and accrued liabilities of $24.2 million, partially offset by increases in accounts receivable and inventories of $6.5 million and $3.5 million, respectively. The increase in deferred revenue in each period reflects shipments of product into the wholesale and retail distribution channels offset in part

by end-customer product demand recognized as revenue under the sell-through revenue recognition method. The increase in accounts receivable in each period reflects increasing wholesaler purchases in connection with the growth of product demand, primarily AVINZA for which co-promotion activities with Organon started in 2003. Likewise, the increase in accounts payable and accrued liabilities for each year primarily reflects the growth in Medicaid rebates and government chargebacks in connection with the growth in demand of AVINZA and ONTAK. Operating cash flows in 2003 also benefited from the impact of the accounts receivable factoring arrangement which was entered into in the second quarter of 2003.

     Operating cash flow in 2003 compared to 2002 benefited from increased product shipments, as reflected in the increase in deferred revenue. The increase in 2003 was also due to increases in our sales related liability accounts.

     We expect operating cash flows to benefit in 2005 from increased product demand due primarily to growth in AVINZA. Operating cash is expected to be negatively impacted, however, by lower product shipments to wholesalers in accordance with reduced inventory levels we negotiated with our major wholesaler customers in the distribution service agreements. The impact of the lower shipments will be partially offset by lower fees paid under the distribution service agreements. Operating cash flows are expected to be further negatively impacted by higher selling and marketing expenses on AVINZA and increased accounting and legal expenses incurred in connection with the restatement of our consolidated financial statements.

     Investing Activities

     Investing activities used cash of $38.8 million for the nine months ended September 30, 2005 compared to cash provided of $2.5 million for the same 2004 period. The use of cash for the nine months ended September 30, 2005 reflects $33.0 million of payments for the buy-down of ONTAK royalty payments in connection with the amended royalty agreement entered into in November 2004 between the Company and Lilly, $3.5 million of net purchases of short-term investments, $1.8 million of purchases of property and equipment, and a $0.5 million capitalized payment to The Salk Institute for the exercise of an option to buy out royalty payments due on future sales of lasofoxifene for a second indication. Cash provided by investing activities for the nine months ended September 30, 2004 primarily reflects a decrease in restricted investments and net proceeds from the sale of short-term investments of $4.6 million and $1.1 million respectively, partially offset by purchases of property and equipment of $2.8 million.

     Investing activities provided cash of $19.6 million in 2004 and used cash of $14.2 million in 2003 and $124.1 million in 2002. Cash provided by investing activities for 2004 reflects net proceeds of $14.1 million from the sale of short-term investments and $9.2 million from the maturing of restricted investments which was subsequently used to pay interest on our 6% Convertible Subordinated Notes. The use of cash in 2004 reflects $3.6 million for capital purchases. The use of cash in 2003 reflects the net purchase of short-term investments of $18.0 million, a $4.1 million payment to Elan in connection with the November 2002 restructuring of the AVINZA license and supply agreement and capital purchases of $2.8 million. Cash provided by investing activities for 2003 includes $10.4 million from the maturing of restricted investments which was subsequently used to pay interest on our 6% Convertible Subordinated Notes.

     The use of cash in 2002 includes $100.0 million paid to Elan to restructure the AVINZA license and supply agreement and $1.3 million in related transaction fees. The use of cash in 2002 also includes the restriction of $18.0 million of the proceeds from the Company’s issuance in November 2002 of 6% Convertible Subordinated Notes. The $18.0 million was required to be invested in a U.S. government securities and placed with a trustee to pay the first four scheduled interest payments on the notes. Other investing activity in 2002 includes a $5.0 million payment to X-Ceptor Therapeutics, Inc. (X-Ceptor) and capital expenditures of $3.2 million, partially offset by net proceeds of $4.1 million from the sale of short-term investments. The payment to X-Ceptor was pursuant to a 1999 investment agreement where we maintained the right to acquire all of the outstanding stock of X-Ceptor not held by Ligand at June 30, 2002, or to extend the purchase right for 12 months by providing additional funding of $5.0 million. In April 2002, we elected to extend the purchase right and payment was subsequently made in July 2002. In March 2003, Ligand informed X-Ceptor that it would not exercise the purchase right.

     Financing Activities

     Financing activities used cash of $0.2 million for the nine months ended September 30, 2005 compared to cash provided of $8.0 million for the same 2004 period. Cash used in financing activities for the nine months ended September 30, 2005 reflects repayment of long-term debt and net payments under equipment financing arrangements of $0.2 million and $0.8 million, respectively, partially offset by net proceeds from the exercise of employee stock options and purchases under the Company’s employee stock purchase plan of $0.9 million. Cash provided by financing activities for the nine months ended September 30, 2004 includes proceeds from the exercise of employee stock options and purchases under the Company’s employee stock purchase plan and net proceeds from equipment financing arrangements of $6.3 million and $1.9 million, respectively.

     Financing activities provided cash of $7.9 million in 2004 compared to $32.1 million in 2003 and $171.1 million in 2002. Cash provided by financing activities in 2004 includes net proceeds of $6.6 million from the exercise of employee stock options and stock purchases under our employee stock purchase plan and $1.8 million of net proceeds received under equipment financing arrangements. Cash provided by financing activities in 2003 includes net proceeds of $45.0 million from the issuance of common stock through a private placement of 3,483,593 shares of our common stock, $4.5 million from the exercise of employee stock options and employee stock purchases, and $1.1 million from equipment financing arrangements. The net proceeds of $45.0 million from the private placement were used to support our working capital priorities, including qualifying second source manufacturer(s) for AVINZA, work on a second generation formulation of ONTAK, continuing expansion of commercial support activities for AVINZA and ONTAK, and for general corporate purposes. These proceeds were offset by the $15.9 million repurchase and retirement of approximately 2.2 million shares of our outstanding common stock held by an affiliate of Elan in connection with a November 2002 share repurchase agreement completed in February 2003, and payments of $2.5 million on equipment financing arrangements.

     Cash provided by financing activities in 2002 includes net proceeds of $150.1 million from the issuance of 6% Convertible Subordinated Notes in November 2002, net proceeds of $66.1 million through a private placement of 4,252,500 shares of our common stock, and $3.8 million from the exercise of employee stock options and employee stock purchases. This was partially offset by the $50.0 million early redemption of convertible subordinated debentures in June 2002. The Convertible Subordinated Notes issued in November 2002 pay interest at a semi-annual rate of 6% and mature on November 16, 2007. Of the net proceeds, $18.0 million was used to pay the first four scheduled interest payments.

     Certain of our property and equipment is pledged as collateral under various equipment financing arrangements. As of September 30, 2005, $5.8 million was outstanding under such arrangements with $2.5 million classified as current. Our equipment financing arrangements have terms of three to five years with interest ranging from 4.73% to 10.66%.

     We believe our available cash, cash equivalents, short-term investments and existing sources of funding will be sufficient to satisfy our anticipated operating and capital requirements through at least the next 12 months. Our future operating and capital requirements will depend on many factors, including: the effectiveness of our commercial activities; the pace of scientific progress in our research and development programs; the magnitude of these programs; the scope and results of preclinical testing and clinical trials; the time and costs involved in obtaining regulatory approvals; the costs involved in preparing, filing, prosecuting, maintaining and enforcing patent claims; competing technological and market developments; the ability to establish additional collaborations or changes in existing collaborations; the efforts of our collaborators; and the cost of production. We will also consider additional equipment financing arrangements similar to arrangements currently in place.

     Leases and Off-Balance Sheet Arrangements

     We lease certain of our office and research facilities under operating lease arrangements with varying terms through July 2015. The agreements provide for increases in annual rents based on changes in the Consumer Price Index or fixed percentage increases ranging from 3% to 7%.

     As of September 30, 2005, we are not involved in any off-balance sheet arrangements.

     As of December 31, 2003, we leased one of our corporate office buildings from Nexus Equity VI LLC (“Nexus”), a limited liability company in which Ligand held a 1% ownership interest. No Ligand officer or employee had any financial interest with regard to this lease arrangement or with Nexus. The lease agreement provided for increases in annual rent of 4% and terminated in 2014. In addition, we had the option to either purchase the portion of Nexus that we did not own, purchase the property from the lessor at a purchase price equal to the outstanding debt on the property plus a calculated return on the investment made by Nexus’ other shareholder, sell the property to a third party, or renew the lease arrangement.

     This specific type of operating lease is commonly referred to as a “synthetic lease.” Prior to the issuance of FIN 46(R), synthetic leases represented a form of off-balance sheet financing under which they were treated as an operating lease for financial reporting purposes and as a financing lease for tax purposes. Under FIN 46(R), a synthetic lease is evaluated to determine i) if it qualifies as a VIE and if so, ii) the primary beneficiary required to consolidate the VIE.

     Under FIN 46(R), we determined that Nexus qualified as a VIE, and that we were the primary beneficiary of the VIE, as we would absorb the majority of the entity’s expected losses, if any, as defined by the Interpretation. In accordance with FIN 46(R), we consolidated Nexus as of December 31, 2003. See Note 3, “Significant Accounting Policies – Cumulative Effect of Accounting Change” section for information on the impact of the Company’s adoption of FIN 46(R).

     In April 2004, we exercised our right to acquire the portion of Nexus that we did not own. The acquisition resulted in our assumption of the existing loan against the property and payment to Nexus’ other shareholder of approximately $0.6 million.

          Contractual Obligations

     As of December 31, 2004, future minimum payments due under our contractual obligations are as follows (in thousands):

		Payments Due by Period
						Less than
		Total				1 year				1-3 years				3-5 years				After 5 years
Capital lease obligations (1)		$	7,365			$	2,980			$	3,684			$	701			$	—
Operating lease obligations			22,464				2,939				4,177				3,721				11,627
Loan payable to bank (2)			15,190				1,191				2,381				11,618				—
6% Convertible Subordinated Notes (3)			183,195				9,315				173,880				—				—
Other liabilities (4)			3,549				3,000				549				—				—
Distribution service agreements			6,864				6,864				—				—				—
Consulting agreements			418				418				—				—				—
Manufacturing agreements (5)			11,231				11,131				100				—				—
Total contractual obligations		$	250,276			$	37,838			$	184,771			$	16,040			$	11,627

     As of December 31, 2004, we had net open purchase orders (defined as total open purchase orders at period end less any accruals or invoices charged to or amounts paid against such purchase orders) totaling approximately $18.5 million. In the next twelve months, we also plan to spend approximately $3.0 million on capital expenditures.

     In November 2002, Ligand and Elan agreed to amend the terms of the AVINZA license and supply agreement. Under the terms of the amendment, we paid Elan $100.0 million in return for a reduction in Elan’s product supply price on sales of AVINZA by Ligand, rights to sublicense and obtain a co-promotion partner in its territories, and rights to qualify, and purchase AVINZA from a second manufacturing source. Elan’s adjusted royalty and supply price of AVINZA is approximately 10% of the product’s net sales. We also committed to purchase an annual minimum number of batches of AVINZA from Elan through 2005 estimated at approximately $9.2 million per year.

     In March 2004, we entered into a five-year manufacturing and packaging agreement with Cardinal Health PTS, LLC (“Cardinal”) under which Cardinal will manufacture AVINZA at its Winchester, Kentucky facility. Under the terms of the agreement, we committed to certain minimum annual purchases ranging from approximately $1.6 million to $2.3 million. In August 2005, the FDA approved the production of AVINZA at the Cardinal facility.

          Critical Accounting Policies

     Certain of our policies require the application of management judgment in making estimates and assumptions that affect the amounts reported in the consolidated financial statements and disclosures made in the accompanying notes. Those estimates and assumptions are based on historical experience and various other factors deemed to be applicable and reasonable under the circumstances. The use of judgment in determining such estimates and assumptions is by nature, subject to a degree of uncertainty. Accordingly, actual results could differ materially from the estimates made. Our critical accounting policies are as follows:

          Revenue Recognition

     The Company generates revenue from product sales, collaborative research and development arrangements, and other activities such as distribution agreements, royalties, and sales of technology rights. The Company’s collaborative arrangements and distribution agreements may include multiple elements within a single contract. Each element of the contract is separately negotiated. Payments received may include non-refundable fees at the inception of the contract for technology rights under collaborative arrangements or product rights under distribution agreements, fully burdened funding for services performed during the research phase of collaborative arrangements, milestone payments for specific achievements designated in the collaborative or distribution agreements, royalties on sales of products resulting from collaborative arrangements, and payments for the supply of products under distribution agreements.

     The Company recognizes product revenue in accordance with SAB 104 and SFAS 48. SAB 104 states that revenue should not be recognized until it is realized or realizable and earned. Revenue is realized or realizable and earned when all of the following criteria are met: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services have been rendered; (3) the seller’s price to the buyer is fixed and determinable; and (4) collectibility is reasonably assured. SFAS 48 states that revenue from sales transactions where the buyer has the right to return the product shall be recognized at the time of sale only if (1) the seller’s price to the buyer is substantially fixed or determinable at the date of sale, (2) the buyer has paid the seller, or the buyer is obligated to pay the seller and the obligation is not contingent on resale of the product, (3) the buyer’s obligation to the seller would not be changed in the event of theft or physical destruction or damage of the product, (4) the buyer acquiring the product for resale has economic substance apart from that provided by the seller, (5) the seller does not have significant obligations for future performance to directly bring about resale of the product by the buyer, and (6) the amount of future returns can be reasonably estimated.

          Product sales

     The Company has determined that domestic shipments made to wholesalers for AVINZA, ONTAK, Targretin capsules and Targretin gel do not meet the revenue recognition criteria of SFAS 48 and SAB 104 at the time of shipment, and therefore such shipments are accounted for using the sell-through method. Under the sell-through method, the Company does not recognize revenue upon shipment of product to the wholesaler. For these product sales, the Company invoices the wholesaler, records deferred revenue at gross invoice sales price less estimated cash discounts and for ONTAK, end-customer returns, and classifies the inventory held by the wholesaler as “deferred cost of goods sold” within “Other current assets.” At that point, the Company makes an estimate of units that may be returned and records a reserve for those units against the “deferred cost of goods sold” account. The Company recognizes revenue when such inventory is sold through (as defined hereafter), on a first-in first-out (FIFO) basis. Sell through for ONTAK, Targretin capsules and Targretin gel are considered to be at the point of out movement from the wholesaler to the wholesaler’s customer. Sell through for AVINZA is considered to be at the prescription level or at the point of patient consumption for channels with no prescription requirements.

     A summary of the revenue recognition policy used for each of our products and the expiration of the underlying patents for each product is as follows:

		Method		Revenue Recognition Event		Patent Expiration
AVINZA		Sell-through		Prescriptions		November 2017
ONTAK		Sell-through		Wholesaler out-movement		December 2014
Targretin capsules		Sell-through		Wholesaler out-movement		October 2016
Targretin gel		Sell-through		Wholesaler out-movement		October 2016
Panretin		Sell-in		Shipment to wholesaler		August 2016
International		Sell-in		Shipment to international distributor		February 2011 through April 2013

     For the years ended December 31, 2004, 2003 and 2002, net product sales recognized under the sell-through method represented 96%, 94%, and 95%, respectively, of total net product sales.

     Additionally under the sell-through method, royalties paid based on unit shipments to wholesalers are deferred and recognized as royalty expense as those units are sold through and recognized as revenue. Royalties paid to technology partners are deferred as the Company has the right to offset royalties paid for product that are later returned against subsequent royalty obligations. Royalties for which the Company does not have the ability to offset (for example, at the end of the contractual royalty period) are expensed in the period the royalty obligation becomes due.

     The Company estimates sell-through based upon (1) analysis of third-party information, including information obtained from certain wholesalers with respect to their inventory levels and sell-through to customers, and third-party market research data, and (2) the Company’s internal product movement information. To assess the reasonableness of third-party demand (i.e. sell-through) information, the Company prepares separate demand reconciliations based on inventory in the distribution channel. Differences identified through these reconciliations outside an acceptable range will be recognized as an adjustment to the third-party reported demand in the period those differences are identified. This adjustment mechanism is designed to identify and correct for any material variances between reported and actual demand over time and other potential anomalies such as inventory shrinkage at wholesalers. The Company’s estimates are subject to the inherent limitations of estimates that rely on third-party data, as certain third-party information is itself in the form of estimates. The Company’s sales and revenue recognition under the sell-through method reflect the Company’s estimates of actual product sold through the channel.

     We use information from external sources to estimate our gross product sales under the sell-through revenue recognition method and significant gross to net sales adjustments. Our estimates include product information with respect to prescriptions, wholesaler out-movement and inventory levels, and retail pharmacy stocking levels, and our own internal information. We receive information from IMS Health, a supplier of market research to the pharmaceutical industry, which we use to estimate sell-through demand for our products and retail pharmacy inventory levels. We also receive wholesaler out-movement and inventory information from our wholesaler customers that is used to support and validate our demand-based, sell-through revenue recognition estimates. Additionally, we use wholesaler provided out-movement information to estimate ONTAK sell-through revenue as this data is not available from IMS. The inventory information received from wholesalers is a product of their record-keeping process and their internal contacts surrounding such processes.

     We recognize revenue for Panretin upon shipment to wholesalers as our wholesaler customers only stock minimal amounts of Panretin, if any. As such, wholesaler orders are considered to approximate end-customer demand for the product. Revenues from sales Panretin are net of allowances for rebates, chargebacks and discounts. For international shipments of our product, revenue is recognized upon shipment to our third-party international distributors.

          Sale of Royalty Rights

     Revenue from the sale of royalty rights represents the non-refundable sale to third parties of rights for and exercise of options to acquire future royalties the Company may earn from the sale of products in development with its collaborative partners. If the Company has no continuing involvement in the research, development or marketing of these products, sales of royalty rights are recognized as revenue in the period the transaction is consummated or

the options are exercised or expired. If the Company has significant continuing involvement in the research, development or marketing of the product, proceeds received for the sale of royalty rights are accounted for as a financing arrangement in accordance with EITF 88-18: Sales of Future Royalties.

          Collaborative Research and Development and Other Revenues

     Collaborative research and development and other revenues are recognized as services are performed consistent with the performance requirements of the contract. Non-refundable contract fees for which no further performance obligation exists and where the Company has no continuing involvement are recognized upon the earlier of when payment is received or collection is assured. Revenue from non-refundable contract fees where Ligand has continuing involvement through research and development collaborations or other contractual obligations is recognized ratably over the development period or the period for which Ligand continues to have a performance obligation. Revenue from performance milestones is recognized upon the achievement of the milestones as specified in the respective agreement. Payments received in advance of performance or delivery are recorded as deferred revenue and subsequently recognized over the period of performance or upon delivery.

          Net Product Sales

     The Company’s net product sales represent total product sales less allowances for rebates, chargebacks, discounts, and promotions and losses to be incurred on returns from wholesalers resulting from increases in the selling price of the Company’s products. In addition, the Company incurs certain distributor service agreement fees related to the management of its product by wholesalers. These fees have been recorded within net revenues. For ONTAK, the Company also has established reserves for returns from end customers after sell-through revenue recognition has occurred. Due to estimates and assumptions inherent in determining the amount of returns, chargebacks, and rebates, the actual amount of product returns and claims for chargeback and rebates may be materially different from our estimates.

     The following summarizes the activity in the accrued liability accounts related to allowances for loss on returns, rebates, chargebacks, other discounts, ONTAK end-customer and Panretin returns (in thousands):

		Nine Months Ended								Year Ended December 31,
		September 30,				September 30,
		2005				2004				2004				2003				2002
						(Restated)								(Restated)				(Restated)
Balance — beginning of period		$	16,151			$	9,196			$	9,196			$	3,952			$	3,190
Provision for ONTAK end-customer and Panretin returns			2,360				1,948				3,015				1,547				2,886
Returns			(2,853	)			(1,397	)			(2,492	)			(1,308	)			(2,986	)
Net change — ONTAK end-customer and Panretin returns			(493	)			551				523				239				(100	)
Provision for losses on returns due to changes in prices			4,380				3,034				5,018				4,229				2,265
Charges			(3,281	)			(2,536	)			(3,025	)			(856	)			(1,802	)
Net change — losses on returns			1,099				498				1,993				3,373				463
Provision for Medicaid rebates			15,215				9,792				14,430				2,724				511
Payments			(14,335	)			(5,714	)			(11,074	)			(1,239	)			(445	)
Net change — Medicaid rebates			880				4,078				3,356				1,485				66
Provision for chargebacks			4,263				2,784				3,962				2,184				936
Payments			(4,573	)			(2,494	)			(3,684	)			(2,123	)			(958	)
Net change — chargebacks			(310	)			290				278				61				(22	)
Provision for managed care rebates and other contract discounts			7,362				3,736				5,773				852				34
Payments			(6,273	)			(2,161	)			(4,455	)			(457	)			(3	)
Net change — managed care rebates and other contract discounts			1,089				1,575				1,318				395				31
Provision for other discounts			—				6,321				6,495				9,035				2,091
Payments			(4	)			(5,643	)			(7,008	)			(9,344	)			(1,767	)
Net change — other discounts			(4	)			678				(513	)			(309	)			324
Balance — end of period		$	18,412			$	16,866			$	16,151			$	9,196			$	3,952