UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number: 811-07528 ----------------------------------------------- Insured Municipal Income Fund Inc. ------------------------------------------------------------------------ (Exact name of registrant as specified in charter) 51 West 52nd Street, New York, New York 10019-6114 ------------------------------------------------------------------------ (Address of principal executive offices) (Zip code) Mark F. Kemper, Esq. UBS Global Asset Management 51 West 52nd Street New York, NY 10019-6114 (Name and address of agent for service) Copy to: Jack W. Murphy, Esq. Dechert LLP 1775 I Street, N.W. Washington, DC 20006-2401 Registrant's telephone number, including area code: 212-882 5000 Date of fiscal year end: March 31 Date of reporting period: September 30, 2006 ITEM 1. REPORTS TO STOCKHOLDERS. -------------------------------- [LOGO OF UBS] UBS Global Asset Management INSURED MUNICIPAL INCOME FUND INC. SEMIANNUAL REPORT SEPTEMBER 30, 2006 INSURED MUNICIPAL INCOME FUND INC. November 15, 2006 DEAR SHAREHOLDER, We are pleased to present you with the semiannual report for Insured Municipal Income Fund Inc. (the "Fund") for the six-month period ended September 30, 2006. PERFORMANCE Over the six-month period ended September 30, 2006, the Fund returned 4.33% on a net asset value basis and 2.10% on a market price basis. Over the same period, the Fund's peer group, the Lipper Insured Municipal Debt Funds (Leveraged) category, posted median net asset value and market price returns of 4.05% and 2.52%, respectively. Finally, the Fund's benchmark, the Lehman Brothers Municipal Bond Index (the "Index") returned 3.44% over the semiannual period. (For more performance information, please refer to "Performance at a glance" on page 6.) -------------------------------------------------------------------------------- INSURED MUNICIPAL INCOME FUND INC. INVESTMENT GOAL: High level of current income exempt from federal income tax, consistent with preservation of capital. PORTFOLIO MANAGER: Kevin McIntyre UBS Global Asset Management (Americas) Inc. COMMENCEMENT: June 8, 1993 NYSE SYMBOL: PIF DIVIDEND PAYMENTS: Monthly -------------------------------------------------------------------------------- The Fund continued to use leverage during the period, which helped performance on an absolute basis. As of September 30, 2006, leverage accounted for approximately 40% of the Fund's total assets. While short-term rates rose over the period and increased the Fund's borrowing costs, the leverage still had a positive effect on the Fund's income during the fiscal year, as the yields on the Fund's longer-term bonds more than offset the borrowing costs. Leverage magnifies returns on both the upside and on the downside. AN INTERVIEW WITH PORTFOLIO MANAGER KEVIN McINTYRE Q. HOW WOULD YOU DESCRIBE THE ECONOMIC ENVIRONMENT DURING THE REPORTING PERIOD? A. Economic data were generally positive during the past six months, although economic growth appears to be slowing from an above-average rate back to historical norms. Although the housing market continued to cool, offsetting that trend was a sharp decline in energy prices during the final two months of the reporting period. Other economic -------------------------------------------------------------------------------- 1 INSURED MUNICIPAL INCOME FUND INC. indicators were equally mixed; advance GDP data for the third quarter came in below expectations, while unemployment remained low and consumer confidence high. Q. HOW DID THE FEDERAL RESERVE BOARD (THE "FED") REACT TO THESE ECONOMIC CONDITIONS? A. After raising short-term interest rates in 17 consecutive meetings dating back to 2004, the Fed left rates unchanged at 5.25% in its past three sessions, including its October meeting after the Fund's reporting period ended. Future rate hikes remain a possibility, according to Fed releases, as "some inflation risks remain." The extent and timing of any future firming, or monetary easing for that matter, will likely be dependent on emerging economic data. Q. HOW DID THE MUNICIPAL BOND MARKET PERFORM IN THIS ENVIRONMENT? A. The municipal bond market on the whole outperformed Treasuries throughout the reporting period. Treasury yields rose, resulting in corresponding price declines, while municipal securities with maturities of 10 years and longer actually rallied during this same period. The difference in performance versus Treasuries was greatest when comparing securities with maturities of around 30 years. Q. IN GENERAL TERMS, HOW DID YOU POSITION THE PORTFOLIO? A. In terms of duration, our position remained neutral versus the Index during this reporting period. (Duration is a measure of a fund's sensitivity to interest rate changes and is related to the maturity of the bonds comprising the portfolio.) Our position in longer-term maturities benefited the portfolio on an absolute basis, as the longer end of the curve outperformed every other area on the yield curve. Additionally, some changes to the Fund's investment strategies benefited performance. The Fund has increased its exposure to lower-quality securities and securities subject to the alternative minimum tax (AMT). These changes were implemented to bring the Fund's investment style more in line with that of its peers, with the goal of making it more competitive. During the course of the period, we used these to our advantage. We diversified away from higher grade securities to increase the Fund's position in relatively lower-rated securities. We likewise increased the Fund's position in AMT securities, to benefit from the higher yields associated with these types of bonds. Q. FROM A SECTOR STANDPOINT, WHAT WERE IMPORTANT POSITIONS FOR THE FUND? A. We strive to maintain a well-diversified portfolio regardless of market conditions. As a result, the Fund holds bonds in a number of different -------------------------------------------------------------------------------- 2 INSURED MUNICIPAL INCOME FUND INC. sectors. During the reporting period, we have focused our research on uncovering new opportunities in the water, airport and hospital sectors. This research indicates that the water sector tends to have stronger revenue and earnings stability than some other sectors of the municipal market, even in changing economic climates. While we reduced the Fund's position in water related bonds during the period in order to diversify into other areas, we continued to view the sector positively, and it represented the Fund's largest sector position at period end. Meanwhile, the airport sector continued to rebound during the period. A significant portion of airport sector bonds are subject to AMT and tend to offer higher yields. The Fund owns NYC IDA revenue bonds for the Terminal One Group Association, which have performed well over this period, helping us to diversify the credit quality of the portfolio. While our long-term outlook for the healthcare sector as a whole remains negative, we see positive trends developing for certain healthcare providers that have stable or improving finances and strong market share. With that in mind, we have selectively added to our holdings in this sector, and performance has been solid in recent months. Although the tobacco sector posted very strong performance yet again during the reporting period, we continued to avoid it, which detracted from performance during the period. We do not believe the potential rewards in the tobacco sector are commensurate with the risks our analysis indicates these bonds entail. In an attempt to concentrate Fund assets on risks we feel are likely to be compensated, we minimized our exposure to this sector. Q. WERE THERE ANY STATES OR REGIONS THAT WERE AN AREA OF FOCUS FOR THE FUND? A. From a regional standpoint, we continued to focus on states that exhibited improved fiscal health and offered what we viewed as attractively valued municipal bonds. Issues that we believe met that definition included long-term California bonds and New York securities. While we opportunistically reduced these positions where we were able to benefit performance, they remained our largest single state exposures at period end. Additionally, we have increased our exposure to New Jersey bonds, primarily with the purchase of New Jersey Transportation Trust Fund Bonds, one of our best-performing bonds over the period. -------------------------------------------------------------------------------- 3 INSURED MUNICIPAL INCOME FUND INC. Q. WHAT IS YOUR OUTLOOK FOR THE ECONOMY AND THE MUNICIPAL FIXED INCOME MARKET? A. We are generally more upbeat on the prospects for the economy than some market prognosticators. Throughout 2006, corporate earnings have appeared quite healthy, while employment and wage data have appeared strong. Inflation, high energy prices and the prospect of a bursting housing bubble represent the major hurdles facing the economy and the markets, and we find it unlikely that any of the three represents enough of a threat to derail what has been a period of solid, if not exceptional, economic growth. With respect to the municipal bond market, we believe there continue to be pockets of attractive valuations along the yield curve and within certain sectors. Our in-house research should help position the Fund well in hopes of taking advantage of those investment opportunities we identify in the months and quarters that follow. -------------------------------------------------------------------------------- 4 INSURED MUNICIPAL INCOME FUND INC. We thank you for your continued support and welcome any comments or questions you may have. For additional information regarding your fund, please contact your financial advisor, or visit us at www.ubs.com/globalam-us. Sincerely, /s/ Kai R. Sotorp Kai R. Sotorp President Insured Municipal Income Fund Inc. Head of the Americas UBS Global Asset Management (Americas) Inc. /s/ Kevin McIntyre Kevin McIntyre Portfolio Management Team Insured Municipal Income Fund Inc. Director UBS Global Asset Management (Americas) Inc. /s/ Elbridge T. Gerry Elbridge T. Gerry III Portfolio Management Team Insured Municipal Income Fund Inc. Managing Director UBS Global Asset Management (Americas) Inc. This letter is intended to assist shareholders in understanding how the Fund performed during the six-month period ended September 30, 2006. The views and opinions in the letter were current as of November 15, 2006. They are not guarantees of performance or investment results and should not be taken as investment advice. Investment decisions reflect a variety of factors, and we reserve the right to change our views about individual securities, sectors and markets at any time. As a result, the views expressed should not be relied upon as a forecast of the Fund's future investment intent. We encourage you to consult your financial advisor regarding your personal investment program. -------------------------------------------------------------------------------- 5 INSURED MUNICIPAL INCOME FUND INC. PERFORMANCE AT A GLANCE (UNAUDITED) AVERAGE ANNUAL TOTAL RETURNS FOR PERIODS ENDED 09/30/06 INSURED MUNICIPAL INCOME FUND INC. 6 MONTHS 1 YEAR 5 YEARS 10 YEARS -------------------------------------------------------------------------------------------------- Net asset value 4.33% 5.41% 5.18% 5.95% -------------------------------------------------------------------------------------------------- Market price 2.10% 5.24% 5.70% 7.12% ================================================================================================== LIPPER INSURED MUNICIPAL DEBT FUNDS (LEVERAGED) MEDIAN -------------------------------------------------------------------------------------------------- Net asset value 4.05% 5.10% 6.34% 6.39% -------------------------------------------------------------------------------------------------- Market price 2.52% 3.64% 6.58% 6.75% ================================================================================================== LEHMAN BROTHERS MUNICIPAL BOND INDEX 3.44% 4.45% 5.17% 5.90% ================================================================================================== PAST PERFORMANCE DOES NOT PREDICT FUTURE PERFORMANCE. THE RETURN AND VALUE OF AN INVESTMENT WILL FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN SOLD, MAY BE WORTH MORE OR LESS THAN THEIR ORIGINAL COST. NAV RETURN ASSUMES, FOR ILLUSTRATION ONLY, THAT DIVIDENDS WERE REINVESTED AT THE NET ASSET VALUE ON THE PAYABLE DATES. NAV AND MARKET PRICE RETURNS FOR THE PERIOD OF LESS THAN ONE YEAR ARE CUMULATIVE. RETURNS DO NOT REFLECT THE DEDUCTION OF TAXES THAT A SHAREHOLDER COULD PAY ON FUND DISTRIBUTIONS. Lipper peer group data calculated by Lipper Inc.; used with permission. The Lipper median is the return of the fund that places in the middle of the peer group. SHARE PRICE, DIVIDEND AND YIELDS AS OF 09/30/06 ----------------------------------------------------------------------------------------- Market price $12.97 ----------------------------------------------------------------------------------------- Net asset value (per share applicable to common shareholders) $15.01 ----------------------------------------------------------------------------------------- Net investment income dividends paid to common shareholders during the twelve months ended 09/30/06 $0.64 ----------------------------------------------------------------------------------------- September 2006 dividend $0.05 ----------------------------------------------------------------------------------------- Market yield* 4.63% ----------------------------------------------------------------------------------------- NAV yield* 4.00% ========================================================================================= * Market yield is calculated by multiplying the September dividend by 12 and dividing by the month-end market price. NAV yield is calculated by multiplying the September dividend by 12 and dividing by the month-end net asset value. Prices and yields will vary. -------------------------------------------------------------------------------- 6 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO STATISTICS (UNAUDITED) CHARACTERISTICS 09/30/06 03/31/06 09/30/05 ---------------------------------------------------------------------------------------------------- Net assets applicable to common shareholders (mm) $309.6 $303.3 $311.0 ---------------------------------------------------------------------------------------------------- Weighted average maturity 15.0 yrs 15.4 yrs 14.3 yrs ---------------------------------------------------------------------------------------------------- Weighted average duration 4.9 yrs 5.2 yrs 4.2 yrs ---------------------------------------------------------------------------------------------------- Weighted average coupon 5.1% 5.1% 5.0% ---------------------------------------------------------------------------------------------------- Leverage** 40.1% 39.7% 40.1% ---------------------------------------------------------------------------------------------------- Securities subject to alternative minimum tax (AMT)* 14.8% 8.6% 1.4% ---------------------------------------------------------------------------------------------------- Callable/maturing within five years* 13.6% 12.3% 11.6% ---------------------------------------------------------------------------------------------------- Callable/maturing beyond five years* 86.4% 87.7% 88.4% ---------------------------------------------------------------------------------------------------- PORTFOLIO COMPOSITION*** 09/30/06 03/31/06 09/30/05 ---------------------------------------------------------------------------------------------------- Long-term municipal bonds 89.0% 91.2% 89.7% ---------------------------------------------------------------------------------------------------- Short-term municipal notes 10.6 8.0 8.4 ---------------------------------------------------------------------------------------------------- Futures and swaps (0.1) 0.0+ 0.5 ---------------------------------------------------------------------------------------------------- Other assets less liabilities 0.5 0.8 1.4 ---------------------------------------------------------------------------------------------------- Total 100.0% 100.0% 100.0% ==================================================================================================== CREDIT QUALITY* 09/30/06 03/31/06 09/30/05 ---------------------------------------------------------------------------------------------------- AAA 71.0% 82.8% 89.2% ---------------------------------------------------------------------------------------------------- AA 8.7 1.1 - ---------------------------------------------------------------------------------------------------- A 2.2 1.2 - ---------------------------------------------------------------------------------------------------- BBB 4.9 4.6 - ---------------------------------------------------------------------------------------------------- A-1 9.8 8.1 8.6 ---------------------------------------------------------------------------------------------------- Nonrated 3.4 2.2 2.2 ---------------------------------------------------------------------------------------------------- Total 100.0% 100.0% 100.0% ==================================================================================================== * Weightings represent percentages of total investments as of the dates indicated. The Fund's portfolio is actively managed and its composition will vary over time. ** As a percentage of total assets as of the dates indicated. *** As a percentage of net assets applicable to common and preferred shareholders as of the dates indicated. Credit quality ratings shown are designated by Standard & Poor's Rating Group, an independent rating agency. + Represents less than 0.05% of net assets applicable to common and preferred shareholders as of the date indicated. -------------------------------------------------------------------------------- 7 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO STATISTICS (UNAUDITED) (CONCLUDED) TOP FIVE STATES* 09/30/06 03/31/06 09/30/05 ---------------------------------------------------------------------------------------------- California 26.3% California 30.5% California 38.1% ---------------------------------------------------------------------------------------------- New York 13.4 Texas 15.5 Texas 13.4 ---------------------------------------------------------------------------------------------- Florida 7.4 New York 14.2 New York 7.3 ---------------------------------------------------------------------------------------------- Texas 7.0 Florida 7.4 Washington 6.4 ---------------------------------------------------------------------------------------------- South Carolina 6.5 South Carolina 4.9 Georgia 5.4 ---------------------------------------------------------------------------------------------- Total 60.6% 72.5% 70.6% ============================================================================================== TOP FIVE SECTORS* 09/30/06 03/31/06 09/30/05 ---------------------------------------------------------------------------------------------- Water 20.8% Water 25.4% Water 24.9% ---------------------------------------------------------------------------------------------- Power 14.5 Power 17.5 Power 19.3 ---------------------------------------------------------------------------------------------- Airport 12.1 Airport 8.4 Hospital 5.0 ---------------------------------------------------------------------------------------------- Hospital 9.1 Hospital 4.0 Lease 4.2 ---------------------------------------------------------------------------------------------- Transportation 7.3 University 2.5 Airport 3.3 ---------------------------------------------------------------------------------------------- Total 63.8% 57.8% 56.7% ============================================================================================== * Weightings represent percentages of total investments as of the dates indicated. The Fund's portfolio is actively managed and its composition will vary over time. -------------------------------------------------------------------------------- 8 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--149.28% ----------------------------------------------------------------------------------------------------- CALIFORNIA--43.71% $3,000 California State Department of Water Resources Revenue-Central Valley Project-Series AC (MBIA Insured) Aaa AAA 12/01/27 5.000% $3,170,760 ----------------------------------------------------------------------------------------------------- 4,000 California State General Obligation A1 A[PLUS] 02/01/33 5.000 4,151,440 ----------------------------------------------------------------------------------------------------- 30 California State General Obligation (FGIC Insured) Aaa AAA 11/01/12 7.000 30,087 ----------------------------------------------------------------------------------------------------- 7,000 California State General Obligation Refunding-Series 2 A1 A[PLUS] 09/01/27 5.000 7,387,170 ----------------------------------------------------------------------------------------------------- 3,305 Chino Valley Unified School District-Series A (FSA Insured) Aaa AAA 08/01/26 5.000 3,470,581 ----------------------------------------------------------------------------------------------------- 4,400 Inglewood Unified School District-1998 Election-Series C (FSA Insured) Aaa AAA 10/01/28 5.000 4,619,868 ----------------------------------------------------------------------------------------------------- 2,000 Long Beach Finance Authority Lease Revenue-Aquarium of the South Pacific (AMBAC Insured) Aaa AAA 11/01/15 5.500 2,178,100 ----------------------------------------------------------------------------------------------------- 5,000 Long Beach Harbor Revenue Refunding-Series A (FGIC Insured)++ Aaa AAA 05/15/13 6.000 5,606,250 ----------------------------------------------------------------------------------------------------- 5,000 Los Angeles Community College District Refunding-Election 2001-Series A (FSA Insured) Aaa AAA 08/01/25 5.000 5,322,950 ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 9 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- CALIFORNIA--(CONTINUED) $9,000 Los Angeles Community College District Refunding-Election 2001-Series A (FSA Insured) Aaa AAA 06/01/26 5.000% $9,560,700 ----------------------------------------------------------------------------------------------------- 6,000 Los Angeles County Sanitation Districts Financing Authority Revenue-Capital Projects-District No.14-Subseries B (FGIC Insured) NR AAA 10/01/28 5.000 6,370,680 ----------------------------------------------------------------------------------------------------- 8,475 Los Angeles County Sanitation Districts Financing Authority Revenue-Capital Projects-Series A (FSA Insured) Aaa AAA 10/01/20 5.000 9,111,557 ----------------------------------------------------------------------------------------------------- 3,000 Los Angeles Unified School District-Series A (FSA Insured) Aaa AAA 07/01/20 5.250 3,269,910 ----------------------------------------------------------------------------------------------------- 11,625 Los Angeles Wastewater System Revenue Refunding-Subseries A (MBIA Insured) Aaa AAA 06/01/26 5.000 12,195,090 ----------------------------------------------------------------------------------------------------- 5,000 Los Angeles Water & Power Revenue-Power System-Series A-Subseries A-2 (MBIA-IBC Insured) Aaa AAA 07/01/30 5.000 5,229,850 ----------------------------------------------------------------------------------------------------- 6,000 Los Angeles Water & Power Revenue-Power System-Series B (FSA Insured) Aaa AAA 07/01/25 5.000 6,345,600 ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 10 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- CALIFORNIA--(CONCLUDED) $7,160 Oxnard Financing Authority Wastewater Revenue-Redwood Trunk Sewer & Headworks-Series A (FGIC Insured) Aaa AAA 06/01/34 5.250% $7,658,981 ----------------------------------------------------------------------------------------------------- 10,000 Sacramento County Sanitation District Financing Authority Revenue Refunding (AMBAC Insured) Aaa AAA 12/01/27 5.000 10,352,800 ----------------------------------------------------------------------------------------------------- 7,000 Sacramento Municipal Utility District Electric Revenue-Municipal Utility District-Series R (MBIA Insured) Aaa AAA 08/15/19 5.000 7,517,090 ----------------------------------------------------------------------------------------------------- 5,000 Sacramento Municipal Utility District Electric Revenue-Municipal Utility District-Series R (MBIA Insured) Aaa AAA 08/15/33 5.000 5,227,450 ----------------------------------------------------------------------------------------------------- 4,000 San Francisco City & County Airports Commission International Airport Revenue Refunding-Second Series 27B (FGIC Insured) Aaa AAA 05/01/15 5.250 4,264,560 ----------------------------------------------------------------------------------------------------- 7,910 San Jose Libraries, Parks & Public Safety Project (MBIA Insured) Aaa AAA 09/01/27 5.000 8,320,371 ----------------------------------------------------------------------------------------------------- 3,825 Walnut Energy Center Authority Revenue-Series A (AMBAC Insured) Aaa AAA 01/01/34 5.000 3,978,038 ----------------------------------------------------------------------------------------------------- 135,339,883 ===================================================================================================== -------------------------------------------------------------------------------- 11 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- DISTRICT OF COLUMBIA--4.04% $4,000 District of Columbia Hospital Revenue Refunding-Medlantic Healthcare-Series A (Escrowed to Maturity) (MBIA Insured) Aaa AAA 08/15/14 5.750% $4,086,320 ----------------------------------------------------------------------------------------------------- 6,000 District of Columbia Water & Sewer Authority Public Utility Revenue- Subordinate Lien Revenue (FGIC Insured) Aaa AAA 10/01/33 5.000 6,240,660 ----------------------------------------------------------------------------------------------------- 2,000 Metropolitan Washington, D.C. Airport Authority Airport System Revenue-Series A (MBIA Insured)++ Aaa AAA 10/01/16 5.250 2,186,220 ----------------------------------------------------------------------------------------------------- 12,513,200 ===================================================================================================== FLORIDA--12.28% 8,000 Florida State Board of Education-Capital Outlay-Series E (FGIC Insured) Aaa AAA 06/01/24 5.000 8,422,720 ----------------------------------------------------------------------------------------------------- 10,220 Florida State Board of Education-Public Education-Series A (FSA Insured) Aaa AAA 06/01/27 5.000 10,721,189 ----------------------------------------------------------------------------------------------------- 1,060 Hillsborough County Port District Revenue- Tampa Port Authority Project-Series A (MBIA Insured)++ Aaa AAA 06/01/16 5.750 1,160,011 ----------------------------------------------------------------------------------------------------- 1,115 Hillsborough County Port District Revenue- Tampa Port Authority Project-Series A (MBIA Insured)++ Aaa AAA 06/01/17 5.750 1,220,200 ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 12 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- FLORIDA--(CONCLUDED) $1,175 Hillsborough County Port District Revenue- Tampa Port Authority Project-Series A (MBIA Insured)++ Aaa AAA 06/01/18 5.750% $1,285,861 ----------------------------------------------------------------------------------------------------- 1,240 Hillsborough County Port District Revenue- Tampa Port Authority Project-Series A (MBIA Insured)++ Aaa AAA 06/01/19 5.750 1,356,994 ----------------------------------------------------------------------------------------------------- 10,000 Miami-Dade County Aviation Revenue Refunding-Miami International Airport-Series B (XLCA Insured)++ Aaa AAA 10/01/18 5.000 10,610,100 ----------------------------------------------------------------------------------------------------- 3,000 Miami-Dade County Expressway Authority Toll System Revenue-Series B (FGIC Insured) Aaa AAA 07/01/26 5.250 3,260,250 ----------------------------------------------------------------------------------------------------- 38,037,325 ===================================================================================================== GEORGIA--7.42% 11,545 Atlanta Airport Revenue Refunding-Series D (FGIC Insured)++ Aaa AAA 01/01/15 5.250 12,385,245 ----------------------------------------------------------------------------------------------------- 1,015 Columbus Building Authority Lease Revenue-Series A (FGIC Insured) Aaa AAA 01/01/16 5.250 1,114,622 ----------------------------------------------------------------------------------------------------- 15 Georgia Municipal Electric Authority Power Revenue-Series Y (Escrowed to Maturity) (MBIA-IBC Insured) Aaa AAA 01/01/10 10.000 17,903 ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 13 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- GEORGIA--(CONCLUDED) $4,515 Georgia Municipal Electric Authority Power Revenue-Unrefunded Balance-Series Y (FSA-CR Insured)+ Aaa AAA 01/01/10 10.000% $5,382,467 ----------------------------------------------------------------------------------------------------- 3,410 Georgia Municipal Electric Authority Power Revenue-Unrefunded Balance-Series Y (MBIA-IBC Insured) Aaa AAA 01/01/10 10.000 4,065,163 ----------------------------------------------------------------------------------------------------- 22,965,400 ===================================================================================================== ILLINOIS--3.75% 1,500 Chicago General Obligation-Series A (FSA Insured) Aaa AAA 01/01/25 5.000 1,577,160 ----------------------------------------------------------------------------------------------------- 2,000 Chicago General Obligation-Series A (FSA Insured) Aaa AAA 01/01/26 5.000 2,100,320 ----------------------------------------------------------------------------------------------------- 4,500 Illinois Health Facilities Authority Revenue-Franciscan Sisters Health Care-Series C (Escrowed to Maturity) (MBIA Insured) Aaa AAA 09/01/18 5.750 5,123,790 ----------------------------------------------------------------------------------------------------- 2,395 Metropolitan Pier & Exposition Authority Dedicated State Tax-Series A-2002 (Pre-refunded with US Government Securities to 06/15/19 @ 100) (FGIC Insured) Aaa AAA 12/15/23 5.500 2,822,268 ----------------------------------------------------------------------------------------------------- 11,623,538 ===================================================================================================== INDIANA--2.05% 1,000 Indiana University Revenues-Student Fee- Series O (FGIC Insured) Aaa AAA 08/01/18 5.250 1,084,050 ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 14 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- INDIANA--(CONCLUDED) $5,000 Indianapolis Airport Authority Revenue Refunding-Special Facilities-Fed Ex Corp. Project (Federal Express Co. Insured)++ Baa2 BBB 01/15/17 5.100% $5,273,350 ----------------------------------------------------------------------------------------------------- 6,357,400 ===================================================================================================== MAINE--1.56% 4,785 Maine Health & Higher Educational Facilities Authority Revenue-Series A (Escrowed to Maturity) (FSA Insured) NR AAA 07/01/23 5.500 4,828,926 ===================================================================================================== MICHIGAN--1.87% 5,525 Michigan State Hospital Finance Authority Revenue Refunding-Trinity Health Credit-Series D Aa3 AA- 08/15/25 5.000 5,795,173 ===================================================================================================== MISSOURI--1.66% 1,740 St. Louis Airport Revenue-Capital Improvement Program-Series A (MBIA Insured) Aaa AAA 07/01/15 5.375 1,879,443 ----------------------------------------------------------------------------------------------------- 2,035 St. Louis Airport Revenue-Capital Improvement Program-Series A (MBIA Insured) Aaa AAA 07/01/16 5.375 2,193,710 ----------------------------------------------------------------------------------------------------- 1,000 St. Louis Airport Revenue-Capital Improvement Program-Series A (MBIA Insured) Aaa AAA 07/01/18 5.375 1,075,860 ----------------------------------------------------------------------------------------------------- 5,149,013 ===================================================================================================== -------------------------------------------------------------------------------- 15 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- NEVADA--5.75% $6,000 Clark County-Bond Bank (MBIA Insured) Aaa AAA 06/01/32 5.000% $6,235,080 ----------------------------------------------------------------------------------------------------- 4,000 Washoe County Gas & Water Facilities Revenue Refunding- Sierra Pacific Power Co. Project-Series B (MBIA Insured) Aaa AAA 06/01/23 5.900 4,042,480 ----------------------------------------------------------------------------------------------------- 7,500 Washoe County Water Facilities Revenue Refunding-Sierra Pacific Power Co. Project-Series A (MBIA Insured) Aaa AAA 06/01/23 5.900 7,513,425 ----------------------------------------------------------------------------------------------------- 17,790,985 ===================================================================================================== NEW JERSEY--8.33% 3,150 New Jersey Economic Development Authority Revenue-Cigarette Tax (FGIC Insured) Aaa AAA 06/15/09 5.000 3,265,259 ----------------------------------------------------------------------------------------------------- 20,000 New Jersey Transportation Trust Fund Authority- Transportation System-Series A A1 AA- 12/15/20 5.250 22,526,400 ----------------------------------------------------------------------------------------------------- 25,791,659 ===================================================================================================== NEW MEXICO--2.85% 4,130 University of New Mexico Revenues- Hospital Mortgage (FSA-FHA Insured) Aaa AAA 01/01/23 5.000 4,366,112 ----------------------------------------------------------------------------------------------------- 4,230 University of New Mexico Revenues- Hospital Mortgage (FSA-FHA Insured) Aaa AAA 07/01/23 5.000 4,471,829 ----------------------------------------------------------------------------------------------------- 8,837,941 ===================================================================================================== -------------------------------------------------------------------------------- 16 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- NEW YORK--21.99% $3,000 New York State Dormitory Authority Revenues-Memorial Sloan Kettering Center-Series 1 (MBIA Insured) Aaa AAA 07/01/16 5.000% $3,203,340 ----------------------------------------------------------------------------------------------------- 1,360 Long Island Power Authority Electric System Revenue- Series A-Unrefunded Balance (FSA Insured) Aaa AAA 12/01/22 5.125 1,409,028 ----------------------------------------------------------------------------------------------------- 5,650 Metropolitan Transportation Authority Dedicated Tax Fund- Series A (FSA Insured) Aaa AAA 11/15/24 5.250 6,100,248 ----------------------------------------------------------------------------------------------------- 5,000 New York City General Obligation-Series J- Subseries J-1 A1 AA- 06/01/27 5.000 5,274,300 ----------------------------------------------------------------------------------------------------- 6,000 New York City General Obligation-Series O A1 AA- 06/01/24 5.000 6,314,340 ----------------------------------------------------------------------------------------------------- 4,615 New York City General Obligation-Subseries F-1 A1 AA- 09/01/25 5.000 4,862,641 ----------------------------------------------------------------------------------------------------- 1,710 New York City Industrial Development Agency Special Facilities Revenue-Terminal One Group Association Project++ A3 BBB[PLUS] 01/01/07 5.000 1,714,942 ----------------------------------------------------------------------------------------------------- 5,000 New York City Industrial Development Agency Special Facilities Revenue-Terminal One Group Association Project++ A3 BBB[PLUS] 01/01/15 5.500 5,434,650 ----------------------------------------------------------------------------------------------------- 6,685 New York City Industrial Development Agency Special Facilities Revenue-Terminal One Group Association Project++ A3 BBB[PLUS] 01/01/16 5.500 7,297,079 ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 17 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- NEW YORK--(CONCLUDED) $2,750 New York City Industrial Development Agency Special Facilities Revenue-Terminal One Group Association Project++ A3 BBB[PLUS] 01/01/18 5.500(++)% $2,986,472 ----------------------------------------------------------------------------------------------------- 7,000 New York City Municipal Water Finance Authority Water & Sewer System Revenue-Series C (MBIA Insured) Aaa AAA 06/15/26 5.000 7,441,350 ----------------------------------------------------------------------------------------------------- 10,080 New York City Municipal Water Finance Authority Water & Sewer System Revenue-Series C (MBIA Insured) Aaa AAA 06/15/27 5.000 10,707,984 ----------------------------------------------------------------------------------------------------- 5,000 Triborough Bridge & Tunnel Authority Revenues-Subordinate Bonds (AMBAC Insured) Aaa AAA 11/15/26 5.125 5,329,650 ----------------------------------------------------------------------------------------------------- 68,076,024 ===================================================================================================== NORTH CAROLINA--0.87% 2,500 North Carolina Eastern Municipal Power Agency Power System Revenue Refunding-Series A Baa2 BBB 01/01/12 5.500 2,687,025 ===================================================================================================== OHIO--1.70% 5,000 Cleveland Airport System Revenue- Series A (FSA Insured) Aaa AAA 01/01/14 5.250 5,265,550 ===================================================================================================== PENNSYLVANIA--5.31% 15,390 Allegheny County Sanitation Authority Sewer Revenue Refunding-Series A (MBIA Insured) Aaa AAA 12/01/23 5.000 16,426,978 ===================================================================================================== -------------------------------------------------------------------------------- 18 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONTINUED) ----------------------------------------------------------------------------------------------------- SOUTH CAROLINA--10.86% $2,500 Medical University of South Carolina Hospital Authority Hospital Facilities Revenue Refunding- Series A (MBIA-FHA Insured) Aaa AAA 02/15/25 5.250% $2,681,325 ----------------------------------------------------------------------------------------------------- 1,000 Myrtle Beach Water & Sewer Revenue System Refunding (FGIC Insured) Aaa AAA 03/01/15 5.375 1,098,710 ----------------------------------------------------------------------------------------------------- 20,000 South Carolina Public Service Authority Revenue-Santee Cooper-Series A (MBIA Insured) Aaa AAA 01/01/25 5.000 21,341,800 ----------------------------------------------------------------------------------------------------- 8,180 South Carolina Transportation Infrastructure Bank Revenue-Series A Aaa NR 10/01/33 5.000 8,488,959 ----------------------------------------------------------------------------------------------------- 33,610,794 ===================================================================================================== TEXAS--10.48% 5,170 Fort Bend Independent School District Refunding-Series A (PSF-GTD) NR AAA 08/15/26 5.250 5,606,400 ----------------------------------------------------------------------------------------------------- 13,500 Houston Utility System Revenue Refunding- First Lien-Series A (FGIC Insured) Aaa AAA 05/15/23 5.250 14,608,485 ----------------------------------------------------------------------------------------------------- 2,000 Jefferson County General Obligation Refunding (FGIC Insured) Aaa AAA 08/01/20 5.250 2,148,300 ----------------------------------------------------------------------------------------------------- 720 San Antonio Water Revenue (Pre-refunded with US Government Securities to 05/15/07 @ 100) (MBIA Insured) Aaa AAA 05/15/16 6.000 806,313 ----------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------- 19 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- LONG-TERM MUNICIPAL BONDS--(CONCLUDED) ----------------------------------------------------------------------------------------------------- TEXAS--(CONCLUDED) $9,000 Wylie Independent School District Refunding (PSF-GTD) Aaa AAA 08/15/30 5.000% $9,290,160 ----------------------------------------------------------------------------------------------------- 32,459,658 ===================================================================================================== WASHINGTON--2.40% 2,220 Cowlitz County School District No. 458 Kelso (FSA Insured) Aaa NR 12/01/15 5.750 2,455,586 ----------------------------------------------------------------------------------------------------- 1,000 Cowlitz County School District No. 458 Kelso (FSA Insured) Aaa NR 12/01/18 5.750 1,099,670 ----------------------------------------------------------------------------------------------------- 1,500 King County Public Hospital District No. 2 Refunding-Evergreen Healthcare (MBIA Insured) Aaa AAA 12/01/18 5.000 1,616,595 ----------------------------------------------------------------------------------------------------- 2,095 King County Public Hospital District No. 2 Refunding-Evergreen Healthcare (MBIA Insured) Aaa AAA 12/01/19 5.000 2,248,794 ----------------------------------------------------------------------------------------------------- 7,420,645 ===================================================================================================== WISCONSIN--0.40% 1,105 Ladysmith-Hawkins School District Refunding (FGIC Insured) Aaa NR 04/01/20 5.500 1,245,236 ----------------------------------------------------------------------------------------------------- Total long-term municipal bonds (cost--$453,942,344) 462,222,353 ===================================================================================================== SHORT-TERM MUNICIPAL NOTES--17.78% ----------------------------------------------------------------------------------------------------- CALIFORNIA--0.20% 600 Access to Loans for Learning Student Loan Corp. Revenue-Student Loan Program-Series V-A-4 (AMBAC Insured)++ VMIG-1 A-1[PLUS] 10/02/06 3.890* 600,000 ===================================================================================================== -------------------------------------------------------------------------------- 20 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- SHORT-TERM MUNICIPAL NOTES--(CONTINUED) ----------------------------------------------------------------------------------------------------- GEORGIA--0.39% $1,200 Monroe County Development Authority Pollution Control Revenue- Oglethorpe Power Corp. Project (AMBAC Insured) NR A-1[PLUS] 10/02/06 3.790%* $1,200,000 ===================================================================================================== ILLINOIS--6.04% 7,900 Illinois Health Facilities Authority Revenue-University of Chicago Hospitals Project-Series C (MBIA Insured) VMIG-1 A-1[PLUS] 10/02/06 3.820* 7,900,000 ----------------------------------------------------------------------------------------------------- 6,000 Chicago Board of Education- Dedicated Revenues-Series D-2 (CIFG Insured) VMIG-1 A-1[PLUS] 10/02/06 3.860* 6,000,000 ----------------------------------------------------------------------------------------------------- 4,800 Chicago Midway Airport Revenue-Second Lien-Series B (MBIA Insured)++ VMIG-1 A-1[PLUS] 10/02/06 3.890* 4,800,000 ----------------------------------------------------------------------------------------------------- 18,700,000 ===================================================================================================== KENTUCKY--1.45% 4,500 Lexington-Fayette Urban County Airport Corp. Revenue-1st Mortgage-Series A (MBIA Insured)++ VMIG-1 NR 10/02/06 3.930* 4,500,000 ===================================================================================================== MASSACHUSETTS--0.60% 1,840 Massachusetts Health & Educational Facilities Authority Revenue-Capital Asset Program-Series C (MBIA Insured) VMIG-1 A-1[PLUS] 10/02/06 3.800* 1,840,000 ===================================================================================================== -------------------------------------------------------------------------------- 21 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATES RATES VALUE ----------------------------------------------------------------------------------------------------- SHORT-TERM MUNICIPAL NOTES--(CONTINUED) ----------------------------------------------------------------------------------------------------- MISSOURI--3.10% $9,600 Missouri Health & Educational Facilities Authority Health Facilities Revenue-Cox Health Systems (AMBAC Insured) VMIG-1 A-1[PLUS] 10/02/06 3.850%* $9,600,000 ===================================================================================================== NEVADA--1.45% 4,500 Clark County School District-Series A (FSA Insured) VMIG-1 A-1[PLUS] 10/02/06 3.750* 4,500,000 ===================================================================================================== NEW YORK--0.32% 1,000 New York City Municipal Water Finance Authority Water & Sewer Systems Revenue- Series A (FGIC Insured) VMIG-1 A-1[PLUS] 10/02/06 3.750* 1,000,000 ===================================================================================================== TEXAS--1.23% 3,800 Harris County Health Facilities Development Corp. Hospital Revenue- Texas Childrens Hospital-Series B-1 (MBIA Insured) VMIG-1 A-1[PLUS] 10/02/06 3.860* 3,800,000 ===================================================================================================== VIRGINIA--0.45% 1,400 Roanoke Industrial Development Authority Hospital Revenue-Carilion Health Systems- Series C-1 (FSA Insured) VMIG-1 A-1[PLUS] 10/02/06 3.820* 1,400,000 ===================================================================================================== -------------------------------------------------------------------------------- 22 INSURED MUNICIPAL INCOME FUND INC. PORTFOLIO OF INVESTMENTS--SEPTEMBER 30, 2006 (UNAUDITED) PRINCIPAL AMOUNT MOODY'S S&P MATURITY INTEREST (000) RATING RATING DATE RATE VALUE ----------------------------------------------------------------------------------------------------- SHORT-TERM MUNICIPAL NOTES--(CONCLUDED) ----------------------------------------------------------------------------------------------------- WASHINGTON--2.55% $7,900 Port Tacoma- Subordinate Lien (XLCA Insured)++ VMIG-1 A-1[PLUS] 10/02/06 3.900%* $7,900,000 ===================================================================================================== Total short-term municipal notes (cost--$55,040,000) 55,040,000 ===================================================================================================== Total investments (cost--$508,982,344)--167.06% 517,262,353 ----------------------------------------------------------------------------------------------------- Other assets in excess of liabilities--0.76% 2,359,788 ----------------------------------------------------------------------------------------------------- Liquidation value of auction preferred shares--(67.82)% (210,000,000) ----------------------------------------------------------------------------------------------------- Net assets applicable to common shareholders--100.00% $309,622,141 ===================================================================================================== * Variable rate demand notes are payable on demand. The maturity dates shown are the next interest rate reset dates. The interest rates shown are the current rates as of September 30, 2006. + Partial amount pledged as collateral for futures transactions. ++ Security subject to Alternative Minimum Tax. (++) Floating rate security. The interest rate shown is the current rate as of September 30, 2006. AMBAC American Municipal Bond Assurance Corporation CIFG CDC IXIS Financial Guaranty CR Custodial Receipts FGIC Financial Guaranty Insurance Company FHA Federal Housing Authority FSA Financial Security Assurance GTD Guaranteed IBC Insured Bond Certificate MBIA Municipal Bond Investors Assurance NR Not Rated PSF Permanent School Fund XLCA XL Capital Assurance FUTURES CONTRACTS NUMBER OF IN EXPIRATION UNREALIZED CONTRACTS CONTRACTS TO DELIVER EXCHANGE FOR DATES DEPRECIATION ------------------------------------------------------------------------------------------------ 80 US Treasury Bond 20 Year Futures $8,834,758 December 2006 $157,742 ------------------------------------------------------------------------------------------------ 110 US Treasury Note 10 Year Futures 11,777,321 December 2006 109,554 ------------------------------------------------------------------------------------------------ $267,296 ================================================================================================ See accompanying notes to financial statements -------------------------------------------------------------------------------- 23 INSURED MUNICIPAL INCOME FUND INC. STATEMENT OF ASSETS AND LIABILITIES--SEPTEMBER 30, 2006 (UNAUDITED) ASSETS: Investments in securities, at value (cost-$508,982,344) $517,262,353 ---------------------------------------------------------------------------------------- Receivable for interest 6,649,660 ---------------------------------------------------------------------------------------- Receivable for variation margin 10,313 ---------------------------------------------------------------------------------------- Other assets 11,713 ---------------------------------------------------------------------------------------- Total assets 523,934,039 ---------------------------------------------------------------------------------------- LIABILITIES: Payable for investments purchased 3,848,056 ---------------------------------------------------------------------------------------- Payable to investment advisor and administrator 210,357 ---------------------------------------------------------------------------------------- Dividends payable to auction preferred shareholders 86,387 ---------------------------------------------------------------------------------------- Payable to custodian 20,078 ---------------------------------------------------------------------------------------- Accrued expenses and other liabilities 147,020 ---------------------------------------------------------------------------------------- Total liabilities 4,311,898 ---------------------------------------------------------------------------------------- Auction preferred shares Series A, B, C, D, E & F-4,200 non-participating shares authorized, issued and outstanding; $0.001 par value per auction preferred share; $50,000 liquidation value per auction preferred share 210,000,000 ---------------------------------------------------------------------------------------- Net assets applicable to common shareholders $309,622,141 ---------------------------------------------------------------------------------------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS: Common stock-$0.001 par value per common share; 199,995,800 shares authorized; 20,628,363 shares issued and outstanding $301,976,191 ---------------------------------------------------------------------------------------- Distributions in excess of net investment income (132,565) ---------------------------------------------------------------------------------------- Accumulated net realized loss from investments, futures and swaps (234,198) ---------------------------------------------------------------------------------------- Net unrealized appreciation of investments and futures 8,012,713 ---------------------------------------------------------------------------------------- Net assets applicable to common shareholders $309,622,141 ---------------------------------------------------------------------------------------- Net asset value per common share ($309,622,141 applicable to 20,628,363 common shares outstanding) $15.01 ======================================================================================== See accompanying notes to financial statements -------------------------------------------------------------------------------- 24 INSURED MUNICIPAL INCOME FUND INC. STATEMENT OF OPERATIONS FOR THE SIX MONTHS ENDED SEPTEMBER 30, 2006 (UNAUDITED) ------------------------------------------------------------------------------------------ INVESTMENT INCOME: Interest $11,580,356 ------------------------------------------------------------------------------------------ EXPENSES: Investment advisory and administration fees 2,312,560 ------------------------------------------------------------------------------------------ Auction preferred shares expenses 305,809 ------------------------------------------------------------------------------------------ Custody and accounting fees 110,928 ------------------------------------------------------------------------------------------ Reports and notices to shareholders 53,540 ------------------------------------------------------------------------------------------ Professional fees 42,611 ------------------------------------------------------------------------------------------ Transfer agency fees 15,984 ------------------------------------------------------------------------------------------ Insurance fees 13,710 ------------------------------------------------------------------------------------------ Stock exchange listing fees 12,301 ------------------------------------------------------------------------------------------ Directors' fees 10,466 ------------------------------------------------------------------------------------------ Other expenses 7,984 ------------------------------------------------------------------------------------------ 2,885,893 ------------------------------------------------------------------------------------------ Less: Fee waivers by investment advisor and administrator (863,712) ------------------------------------------------------------------------------------------ Net expenses 2,022,181 ------------------------------------------------------------------------------------------ Net investment income 9,558,175 ------------------------------------------------------------------------------------------ REALIZED AND UNREALIZED GAINS (LOSSES) FROM INVESTMENT ACTIVITIES: Net realized gain (loss) from: Investments (160,927) ------------------------------------------------------------------------------------------ Futures (961,236) ------------------------------------------------------------------------------------------ Swaps 628,333 ------------------------------------------------------------------------------------------ Net change in unrealized appreciation/depreciation of: Investments 8,098,907 ------------------------------------------------------------------------------------------ Futures (267,982) ------------------------------------------------------------------------------------------ Swaps (413,608) ------------------------------------------------------------------------------------------ Net realized and unrealized gain from investment activities 6,923,487 ------------------------------------------------------------------------------------------ Dividends paid to auction preferred shareholders from net investment income (3,655,476) ------------------------------------------------------------------------------------------ Net increase in net assets applicable to common shareholders resulting from operations $12,826,186 ========================================================================================== See accompanying notes to financial statements -------------------------------------------------------------------------------- 25 INSURED MUNICIPAL INCOME FUND INC. STATEMENT OF CHANGES IN NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS FOR THE SIX MONTHS ENDED FOR THE SEPTEMBER 30, 2006 YEAR ENDED (UNAUDITED) MARCH 31, 2006 ----------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $9,558,175 $18,502,388 ----------------------------------------------------------------------------------------- Net realized gain (loss) from investments, futures and swaps (493,830) 6,929,139 ----------------------------------------------------------------------------------------- Net change in unrealized appreciation/ depreciation of investments, futures and swaps 7,417,317 (6,284,086) ----------------------------------------------------------------------------------------- DIVIDENDS AND DISTRIBUTIONS PAID TO AUCTION PREFERRED SHAREHOLDERS FROM: Net investment income (3,655,476) (4,609,332) ----------------------------------------------------------------------------------------- Net realized gains from investment activities - (1,383,754) ----------------------------------------------------------------------------------------- Total dividends and distributions paid to auction preferred shareholders (3,655,476) (5,993,086) ----------------------------------------------------------------------------------------- Net increase in net assets applicable to common shareholders resulting from operations 12,826,186 13,154,355 ----------------------------------------------------------------------------------------- DIVIDENDS AND DISTRIBUTIONS PAID TO COMMON SHAREHOLDERS FROM: Net investment income (6,518,563) (13,490,950) ----------------------------------------------------------------------------------------- Net realized gains from investment activities - (4,381,465) ----------------------------------------------------------------------------------------- Total dividends and distributions paid to common shareholders (6,518,563) (17,872,415) ----------------------------------------------------------------------------------------- Net increase (decrease) in net assets applicable to common shareholders 6,307,623 (4,718,060) ----------------------------------------------------------------------------------------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS: Beginning of period 303,314,518 308,032,578 ----------------------------------------------------------------------------------------- End of period $309,622,141 $303,314,518 ----------------------------------------------------------------------------------------- Accumulated undistributed (distributions in excess of) net investment income $(132,565) $483,299 ========================================================================================= See accompanying notes to financial statements -------------------------------------------------------------------------------- 26 INSURED MUNICIPAL INCOME FUND INC. NOTES TO FINANCIAL STATEMENTS (UNAUDITED) ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES Insured Municipal Income Fund Inc. (the "Fund") was incorporated in Maryland on February 18, 1993, and is registered with the Securities and Exchange Commission under the Investment Company Act of 1940, as amended, as a closed-end diversified management investment company. The Fund's investment objective is to achieve a high level of current income that is exempt from federal income tax, consistent with the preservation of capital. There can be no assurance that the Fund's investment objective will be achieved. In the normal course of business the Fund may enter into contracts that contain a variety of representations or that provide indemnifications for certain liabilities. The Fund's maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Fund that have not yet occurred. However, the Fund has not had prior claims or losses pursuant to these contracts and expects the risk of loss to be remote. The preparation of financial statements in accordance with US generally accepted accounting principles requires the Fund's management to make estimates and assumptions that affect the reported amounts and disclosures in the financial statements. Actual results could differ from those estimates. The following is a summary of significant accounting policies: VALUATION OF INVESTMENTS--The Fund calculates its net asset value based on the current market value, where available, for its portfolio securities. The Fund normally obtains market values for its securities from independent pricing sources and broker-dealers. Independent pricing sources may use last reported sale prices, current market quotations or valuations from computerized "matrix" systems that derive values based on comparable securities. A matrix system incorporates parameters such as security quality, maturity and coupon, and/or research and evaluations by its staff, including review of broker-dealer market price quotations, if available, in determining the valuation of the portfolio securities. If a market value is not available from an independent pricing source for a particular security, that security is valued at fair value as determined in good faith by or under the direction of the Fund's Board of Directors (the "Board"). Various factors may be reviewed in order to make a good faith determination of a security's fair value. These factors may include, but are not limited to, the type and cost of the security; contractual or legal restrictions on resale of the security; relevant financial or business developments of the issuer; actively traded similar or related -------------------------------------------------------------------------------- 27 INSURED MUNICIPAL INCOME FUND INC. NOTES TO FINANCIAL STATEMENTS (UNAUDITED) securities; conversion or exchange rights on the security; related corporate actions; and changes in overall market conditions. If events occur that materially affect the value of securities (particularly non-US securities) between the close of trading in those securities and the close of regular trading on the New York Stock Exchange, the securities are fair valued. The amortized cost method of valuation, which approximates market value, generally is used to value short-term debt instruments with sixty days or less remaining to maturity, unless the Board or its delegate determines that this does not represent fair value. Securities traded in the over-the-counter ("OTC") market are valued at the last bid price available on the valuation date prior to valuation. INVESTMENT TRANSACTIONS AND INVESTMENT INCOME--Investment transactions are recorded on the trade date. Realized gains and losses from investment transactions are calculated using the identified cost method. Interest income is recorded on an accrual basis. Discounts are accreted and premiums are amortized as adjustments to interest income and the identified cost of investments. FUTURES CONTRACTS--Upon entering into a financial futures contract, the Fund is required to deliver to a broker an amount of cash and/or securities equal to a certain percentage of the contract amount. This amount is known as the "initial margin". Subsequent payments, known as "variation margin", are made or received by the Fund each day, depending on the daily fluctuations in the value of the underlying financial futures contracts. Such variation margin is recorded for financial statement purposes on a daily basis as unrealized gain or loss until the financial futures contract is closed, at which time the net gain or loss is reclassified to realized gain or loss on futures. Variation margin calls could be substantial in the event of adverse price movements. Using financial futures contracts involves various market risks. If the Fund was unable to liquidate a futures position due to the absence of a liquid secondary market or the imposition of price limits, it could incur substantial losses and would continue to be subject to market risk with respect to the position. In addition, the Fund would continue to be required to make variation margin payments and might be required to maintain the position being hedged or to maintain cash or securities in a separate account. Furthermore, certain characteristics of the futures market might increase the risk that movements in the prices of the financial futures contracts might not correlate perfectly with movements in the prices of the investments -------------------------------------------------------------------------------- 28 INSURED MUNICIPAL INCOME FUND INC. NOTES TO FINANCIAL STATEMENTS (UNAUDITED) being hedged, including temporary price distortion. The separate account for margin will be maintained at the futures counterparty and may be subject to risks or delays if the counterparty becomes insolvent. INTEREST RATE SWAP AGREEMENTS--The Fund may enter into interest rate swap agreements for hedging purposes. This type of swap is an agreement that obligates two parties to exchange a series of cash flows at specified intervals based upon or calculated by reference to a specified interest rate(s) for a specified amount. The payment flows are usually netted against each other, with the difference being paid by one party to the other. Risks may arise as a result of the failure of the counterparty to the swap contract to comply with the terms of the contract. The loss incurred by the failure of a counterparty is generally limited to the net interest payment to be received by the Fund. Therefore, the Fund considers the creditworthiness of the counterparty to a swap contract in evaluating potential credit risk. The Fund accrues for interim payments on swap contracts on a daily basis, with the net amount recorded within unrealized appreciation/depreciation of swap contracts in the "Statement of assets and liabilities." Once interim payments are settled in cash, the net amount is recorded as realized gain/loss on swaps, in addition to realized gain/loss recorded upon the termination of swap contracts in the "Statement of operations." Fluctuations in the value of swap contracts are recorded for financial statement purposes as unrealized appreciation or depreciation of swaps. At September 30, 2006, the Fund was not invested in any interest rate swap agreements. DIVIDENDS AND DISTRIBUTIONS--The Fund intends to pay monthly dividends to common shareholders at a rate level that over time will result in the distribution of all of the Fund's net investment income remaining after the payment of dividends on any outstanding auction preferred shares. The dividend rate on the common stock is adjusted as necessary to reflect the earnings rate of the Fund. Dividends and distributions to common shareholders are recorded on the ex-dividend date. Dividends to auction preferred shareholders are accrued daily. The amount of dividends from net investment income and distributions from net realized capital gains is determined in accordance with federal income tax regulations, which may differ from US generally accepted accounting principles. These "book/tax" differences are either considered temporary or permanent in nature. To the extent these differences are permanent in nature, such amounts are reclassified within the capital -------------------------------------------------------------------------------- 29 INSURED MUNICIPAL INCOME FUND INC. NOTES TO FINANCIAL STATEMENTS (UNAUDITED) accounts based on their federal tax-basis treatment; temporary differences do not require reclassification. CONCENTRATION OF RISK The Fund follows an investment policy of investing primarily in municipal obligations of various states. Economic changes affecting those states and certain of their public bodies and municipalities may affect the ability of the issuers within those states to pay interest on, or repay principal of, municipal obligations held by the Fund. INVESTMENT ADVISOR AND ADMINISTRATOR The Board has approved an investment advisory and administration contract ("Advisory Contract") with UBS Global Asset Management (Americas) Inc. ("UBS Global AM"), under which UBS Global AM serves as investment advisor and administrator of the Fund. UBS Global AM is an indirect wholly owned asset management subsidiary of UBS AG, an internationally diversified organization with headquarters in Zurich and Basel, Switzerland and operations in many areas of the financial services industry. In accordance with the Advisory Contract, the Fund pays UBS Global AM an investment advisory and administration fee, which is accrued weekly and paid monthly, at the annual rate of 0.90% of the Fund's average weekly net assets applicable to holders of common and auction preferred shares. For the period April 1, 2006 through July 31, 2006, UBS Global AM had agreed to waive 0.30% of the advisory and administration fee, so that the Fund's effective fee was 0.60% of average weekly net assets applicable to holders of common and auction preferred shares. Effective August 1, 2006, UBS Global AM agreed to further reduce the Fund's management fee so that the Fund's effective fee for the period August 1, 2006 through September 30, 2006 was 0.83% of the Fund's average weekly net assets applicable only to holders of common shares. This waiver will continue indefinitely unless the Board agrees to any change. At September 30, 2006, the Fund owed UBS Global AM $210,357 in investment advisory and administration fees, which is composed of $383,440 of investment advisory and administration fees less fees waived of $173,083. For the six months ended September 30, 2006, UBS Global AM waived $863,712 of investment advisory and administration fees from the Fund. ADDITIONAL INFORMATION REGARDING COMPENSATION TO AFFILIATE OF A BOARD MEMBER Effective March 1, 2005, Professor Meyer Feldberg accepted the position of senior advisor to Morgan Stanley, resulting in him becoming an interested director of the Fund. The Fund has been informed that Professor Feldberg's -------------------------------------------------------------------------------- 30 INSURED MUNICIPAL INCOME FUND INC. NOTES TO FINANCIAL STATEMENTS (UNAUDITED) role at Morgan Stanley does not involve matters directly affecting any UBS funds. Fund transactions are executed through Morgan Stanley based on that firm's ability to provide best execution of the transactions. During the six months ended September 30, 2006, the Fund purchased and sold certain securities (e.g., fixed income securities) in principal trades with Morgan Stanley having an aggregate value of $19,914,382. Morgan Stanley received compensation in connection with these trades, which may have been in the form of a "mark-up" or "mark-down" of the price of the securities, a fee from the issuer for maintaining a commercial paper program, or some other form of compensation. Although the precise amount of this compensation is not generally known by UBS Global AM, UBS Global AM believes that under normal circumstances it represents a small portion of the total value of the transactions. In addition, Morgan Stanley may participate as a broker-dealer in auctions for the Fund's auction preferred shares and receive compensation therefore. Amounts received by Morgan Stanley, if any, will vary depending upon that firm's participation in an auction, and such amounts are calculated and paid by the auction agent from money provided by the Fund. AUCTION PREFERRED SHARES The Fund has issued 800 shares of auction preferred shares Series A, 800 shares of auction preferred shares Series B, 800 shares of auction preferred shares Series C, 600 shares of auction preferred shares Series D, 600 shares of auction preferred shares Series E and 600 shares of auction preferred shares Series F, which are referred to herein collectively as the "APS." All shares of each series of APS have a liquidation preference of $50,000 per share plus an amount equal to accumulated but unpaid dividends upon liquidation. Dividends, and/or capital gain distributions, which are cumulative, are generally reset every 7 days for each Series of APS. Dividend rates ranged from 2.900% to 4.000% for the six months ended September 30, 2006. The Fund is subject to certain restrictions relating to the APS. Failure to comply with these restrictions could preclude the Fund from declaring any distributions to common shareholders or repurchasing common shares and/or could trigger the mandatory redemption of APS at liquidation value. The APS are entitled to one vote per share and, unless otherwise required by law, will vote with holders of common stock as a single class, except that the APS will vote separately as a class on certain matters, as required by law. The holders of the APS have the right to elect two directors of the Fund. -------------------------------------------------------------------------------- 31 INSURED MUNICIPAL INCOME FUND INC. NOTES TO FINANCIAL STATEMENTS (UNAUDITED) The redemption of the Fund's APS is outside of the control of the Fund because it is redeemable upon the occurrence of an event that is not solely within the control of the Fund. PURCHASES AND SALES OF SECURITIES For the six months ended September 30, 2006, aggregate purchases and sales of portfolio securities, excluding short-term securities, were $88,623,036 and $115,424,399, respectively. FEDERAL TAX STATUS The Fund intends to distribute substantially all of its tax-exempt income and any taxable income and to comply with the other requirements of the Internal Revenue Code applicable to regulated investment companies. Accordingly, no provision for federal income taxes is required. In addition, by distributing during each calendar year substantially all of its net investment income, net realized capital gains and certain other amounts, if any, the Fund intends not to be subject to a federal excise tax. The tax character of distributions paid during the fiscal year ended March 31, 2006 was as follows: DISTRIBUTIONS PAID FROM: 2006 ------------------------------------------------------------------------------- Tax-exempt income $18,093,862 ------------------------------------------------------------------------------- Ordinary income 763,385 ------------------------------------------------------------------------------- Net long-term capital gains 5,008,254 ------------------------------------------------------------------------------- Total distributions paid $23,865,501 =============================================================================== The tax character of distributions paid and the components of accumulated earnings (deficit) on a tax basis for the current fiscal year will be calculated after the Fund's fiscal year ending March 31, 2007. For federal income tax purposes, which was substantially the same for book purposes, the tax cost of investments and the components of net unrealized appreciation of investments at September 30, 2006 were as follows: Tax cost of investments $508,982,344 ------------------------------------------------------------------------------- Gross unrealized appreciation 8,686,883 ------------------------------------------------------------------------------- Gross unrealized depreciation (406,874) ------------------------------------------------------------------------------- Net unrealized appreciation $8,280,009 =============================================================================== -------------------------------------------------------------------------------- 32 INSURED MUNICIPAL INCOME FUND INC. NOTES TO FINANCIAL STATEMENTS (UNAUDITED) On July 13, 2006, the Financial Accounting Standards Board (FASB) released FASB Interpretation No. 48 "Accounting for Uncertainty in Income Taxes" (FIN 48). FIN 48 provides guidance for how uncertain tax positions should be recognized, measured, presented and disclosed in the financial statements. FIN 48 requires the evaluation of tax positions taken or expected to be taken in the course of preparing the Fund's tax returns to determine whether the tax positions are "more-likely-than-not" of being sustained by the applicable tax authority. Tax positions not deemed to meet the more-likely-than-not threshold would be recorded as a tax benefit or expense in the current year. Adoption of FIN 48 is required for fiscal years beginning after December 15, 2006 and is to be applied to all open tax years as of the effective date. At this time, management is evaluating the implications of FIN 48, and its impact on the financial statements has not yet been determined. -------------------------------------------------------------------------------- 33 INSURED MUNICIPAL INCOME FUND INC. FINANCIAL HIGHLIGHTS Selected data for a share of common stock outstanding throughout each period is presented below: FOR THE SIX MONTHS ENDED SEPTEMBER 30, 2006 (UNAUDITED) ---------------------------------------------------------------------------------------------- NET ASSET VALUE, BEGINNING OF PERIOD $14.70 ---------------------------------------------------------------------------------------------- Net investment income 0.46 ---------------------------------------------------------------------------------------------- Net realized and unrealized gains (losses) from investment activities 0.34 ---------------------------------------------------------------------------------------------- Common share equivalent of dividends and distributions paid to auction preferred shareholders from: Net investment income (0.17) ---------------------------------------------------------------------------------------------- Net realized gains from investment activities -- ---------------------------------------------------------------------------------------------- Total dividends and distributions paid to auction preferred shareholders (0.17) ---------------------------------------------------------------------------------------------- Net increase from operations 0.63 ---------------------------------------------------------------------------------------------- Dividends and distributions paid to common shareholders from: Net investment income (0.32) ---------------------------------------------------------------------------------------------- Net realized gains from investment activities -- ---------------------------------------------------------------------------------------------- Total dividends and distributions paid to common shareholders (0.32) ---------------------------------------------------------------------------------------------- Auction preferred shares offering expenses -- ---------------------------------------------------------------------------------------------- NET ASSET VALUE, END OF PERIOD $15.01 ---------------------------------------------------------------------------------------------- MARKET VALUE, END OF PERIOD $12.97 ---------------------------------------------------------------------------------------------- TOTAL INVESTMENT RETURN(1) 2.10% ---------------------------------------------------------------------------------------------- RATIO TO AVERAGE NET ASSETS ATTRIBUTABLE TO COMMON SHARES: Total expenses, net of fee waivers by advisor 1.33%* ---------------------------------------------------------------------------------------------- Total expenses, before fee waivers by advisor 1.90%* ---------------------------------------------------------------------------------------------- Net investment income before auction preferred shares dividends 6.30%* ---------------------------------------------------------------------------------------------- Auction preferred shares dividends from net investment income 2.41%* ---------------------------------------------------------------------------------------------- Net investment income available to common shareholders 3.89%* ---------------------------------------------------------------------------------------------- SUPPLEMENTAL DATA: Net assets applicable to common shareholders, end of period (000's) $309,622 ---------------------------------------------------------------------------------------------- Portfolio turnover 19% ---------------------------------------------------------------------------------------------- Asset coverage per share of auction preferred shares, end of period $123,720 ============================================================================================== * Annualized. 1 Total investment return is calculated assuming a $10,000 purchase of common stock at the current market price on the first day of each period reported and a sale at the current market price on the last day of each period reported, and assuming reinvestment of dividends and other distributions to common shareholders at prices obtained under the Fund's Dividend Reinvestment Plan. Total investment return does not reflect brokerage commissions and has not been annualized for the period of less than one year. Returns do not reflect the deduction of taxes that a shareholder could pay on Fund distributions. # Amount represents less than $0.005 per common share. -------------------------------------------------------------------------------- 34 INSURED MUNICIPAL INCOME FUND INC. FOR THE YEARS ENDED MARCH 31, --------------------------------------------------------------------- 2006 2005 2004 2003 2002 --------------------------------------------------------------------- $14.93 $15.39 $15.76 $15.15 $15.30 --------------------------------------------------------------------- 0.90 0.83 0.84 0.97 1.01 --------------------------------------------------------------------- 0.02 (0.31) 0.00# 0.58 (0.26) --------------------------------------------------------------------- (0.22) (0.14) (0.07) (0.10) (0.17) --------------------------------------------------------------------- (0.07) (0.01) (0.02) -- -- --------------------------------------------------------------------- (0.29) (0.15) (0.09) (0.10) (0.17) --------------------------------------------------------------------- 0.63 0.37 0.75 1.45 0.58 --------------------------------------------------------------------- (0.65) (0.76) (0.84) (0.84) (0.73) --------------------------------------------------------------------- (0.21) (0.07) (0.24) -- -- --------------------------------------------------------------------- (0.86) (0.83) (1.08) (0.84) (0.73) --------------------------------------------------------------------- -- -- (0.04) -- -- --------------------------------------------------------------------- $14.70 $14.93 $15.39 $15.76 $15.15 --------------------------------------------------------------------- $13.02 $12.71 $14.48 $13.98 $13.42 --------------------------------------------------------------------- 9.51% (6.55)% 11.75% 10.61% 8.04% --------------------------------------------------------------------- 1.39% 1.51% 1.35% 1.41% 1.42% --------------------------------------------------------------------- 1.90% 1.96% 1.62% 1.60% 1.61% --------------------------------------------------------------------- 5.95% 5.52% 5.42% 6.23% 6.57% --------------------------------------------------------------------- 1.48% 0.90% 0.44% 0.61% 1.11% --------------------------------------------------------------------- 4.47% 4.62% 4.98% 5.62% 5.46% --------------------------------------------------------------------- $303,315 $308,033 $317,568 $325,060 $312,552 --------------------------------------------------------------------- 57% 50% 37% 24% 14% --------------------------------------------------------------------- $122,218 $123,341 $125,612 $158,353 $154,184 ===================================================================== -------------------------------------------------------------------------------- 35 INSURED MUNICIPAL INCOME FUND INC. GENERAL INFORMATION (UNAUDITED) THE FUND Insured Municipal Income Fund Inc. (the "Fund") is a diversified, closed-end management investment company whose shares trade on the New York Stock Exchange ("NYSE"). The Fund's investment objective is to achieve a high level of current income that is exempt from federal income tax, consistent with the preservation of capital. The Fund's NYSE trading symbol is "PIF." Comparative net asset value and market price information about the Fund is available weekly in various publications. Effective as of April 1, 2006, the Fund's investment advisor and administrator is UBS Global Asset Management (Americas) Inc., an indirect wholly owned asset management subsidiary of UBS AG. QUARTERLY FORM N-Q PORTFOLIO SCHEDULE The Fund will file its complete schedule of portfolio holdings with the Securities and Exchange Commission ("SEC") for the first and third quarters of each fiscal year on Form N-Q. The Fund's Forms N-Q are available on the SEC's Web site at http://www.sec.gov. The Fund's Forms N-Q may be reviewed and copied at the SEC's Public Reference Room in Washington, D.C. Information on the operation of the SEC's Public Reference Room may be obtained by calling 1-800-SEC 0330. Additionally, you may obtain copies of Forms N-Q from the Fund upon request by calling 1-800-647 1568. PROXY VOTING POLICIES, PROCEDURES AND RECORD You may obtain a description of the Fund's (1) proxy voting policies, (2) proxy voting procedures and (3) information regarding how the Fund voted any proxies related to portfolio securities during the most recent 12-month period ended June 30 for which an SEC filing has been made, without charge, upon request by contacting the Fund directly at 1-800-647 1568, online on the Fund's Web site: www.ubs.com/ubsglobalam-proxy, or on the EDGAR Database on the SEC's Web site (http://www.sec.gov). SHAREHOLDER MEETING INFORMATION An annual meeting of shareholders of the Fund was held on July 20, 2006. At the meeting, Richard Q. Armstrong, David J. Beaubien, Alan S. Bernikow, Richard R. Burt, Meyer Feldberg, Bernard H. Garil and Heather R. Higgins were elected to serve as directors until the next annual meeting of shareholders, or until their successors are duly elected and -------------------------------------------------------------------------------- 36 INSURED MUNICIPAL INCOME FUND INC. GENERAL INFORMATION (UNAUDITED) qualified or until they retire, resign or are earlier removed. The shares were voted as indicated below: COMMON STOCK AND APS SHARES VOTING AS A SINGLE CLASS: SHARES TO VOTE FOR OR WITHHOLD AUTHORITY SHARES WITHHOLD IN THE ELECTION OF: VOTED FOR AUTHORITY ----------------------------------------------------------------------------- Richard Q. Armstrong 18,368,783.510 644,267.040 ----------------------------------------------------------------------------- David J. Beaubien 18,370,213.510 642,867.040 ----------------------------------------------------------------------------- Alan S. Bernikow 18,378,487.510 634,593.040 ----------------------------------------------------------------------------- Bernard H. Garil 18,386,407.510 626,673.040 ----------------------------------------------------------------------------- Heather R. Higgins 18,379,678.510 633,402.040 ----------------------------------------------------------------------------- AUCTION PREFERRED SHARES: SHARES TO VOTE FOR OR WITHHOLD AUTHORITY SHARES WITHHOLD IN THE ELECTION OF: VOTED FOR AUTHORITY ----------------------------------------------------------------------------- Meyer Feldberg 3,892 0 ----------------------------------------------------------------------------- Richard R. Burt 3,892 0 ----------------------------------------------------------------------------- The Fund is not aware of any broker non-votes. (Broker non-votes are shares held in street name for which the broker indicates that instructions have not been received from the beneficial owners or other persons entitled to vote and for which the broker does not have discretionary voting authority.) At the end of September 2006, Mr. Beaubien retired from the Fund's board. DIVIDEND REINVESTMENT PLAN The Fund's Board has established a Dividend Reinvestment Plan (the "Plan") under which all common shareholders whose shares are registered in their own names, or in the name of UBS Financial Services Inc. or its nominee, will have all dividends and other distributions on their shares of common stock automatically reinvested in additional shares of common stock, unless such common shareholders elect to receive cash. Common shareholders who elect to hold their shares in the name of another broker or nominee should contact such broker or nominee to determine whether, or how, they may participate in the Plan. The ability of such shareholders to participate in the Plan may change if their shares are transferred into the name of another broker or nominee. A common shareholder may elect not to participate in the Plan or may terminate participation in the Plan at any time without penalty, and common shareholders who have previously terminated participation in -------------------------------------------------------------------------------- 37 INSURED MUNICIPAL INCOME FUND INC. GENERAL INFORMATION (UNAUDITED) the Plan may rejoin it at any time. Changes in elections must be made in writing to the Fund's transfer agent and should include the shareholder's name and address as they appear on the share certificate or in the transfer agent's records. An election to terminate participation in the Plan, until such election is changed, will be deemed an election by a common shareholder to take all subsequent distributions in cash. An election will be effective only for distributions declared and having a record date at least ten days after the date on which the election is received. Additional shares of common stock acquired under the Plan will be purchased in the open market, on the NYSE or otherwise, at prices that may be higher or lower than the net asset value per share of the common stock at the time of the purchase. The number of shares of common stock purchased with each dividend will be equal to the result obtained by dividing the amount of the dividend payable to a particular shareholder by the average price per share (including applicable brokerage commissions) that the transfer agent was able to obtain in the open market. The Fund will not issue any new shares of common stock in connection with the Plan. There currently is no charge to participants for reinvesting dividends or other distributions. The transfer agent's fees for handling the reinvestment of distributions will be paid by the Fund. However, each participant pays a pro rata share of brokerage commissions incurred with respect to the transfer agent's open market purchases of common stock in connection with the reinvestment of distributions. The automatic reinvestment of dividends and other distributions in shares of common stock does not relieve participants of any income tax that may be payable on such distributions. Experience under the Plan may indicate that changes are desirable. Accordingly, the Fund reserves the right to amend or terminate the Plan with respect to any dividend or other distribution if notice of the change is sent to Plan participants at least 30 days before the record date for such distribution. The Plan also may be amended or terminated by the transfer agent by at least 30 days' written notice to all Plan participants. Additional information regarding the Plan may be obtained from, and all correspondence concerning the Plan should be directed to, the transfer agent at PFPC Inc., P.O. Box 43027, Providence, Rhode Island 02940-3027. For further information regarding the Plan, you may also contact the transfer agent directly at 1-800-331 1710. -------------------------------------------------------------------------------- 38 INSURED MUNICIPAL INCOME FUND INC. BOARD APPROVAL OF INVESTMENT ADVISORY AND ADMINISTRATION AGREEMENT (UNAUDITED) BACKGROUND--At a meeting of the board of Insured Municipal Income Fund Inc. (the "Fund") on July 19, 2006, the members of the board, including the directors who are not "interested persons" of the Fund ("Independent Directors"), as defined in the Investment Company Act of 1940, as amended (the "1940 Act"), considered and approved the continuance of the Investment Advisory and Administration Agreement of the Fund with UBS Global Asset Management (Americas) Inc. ("UBS Global AM"). In preparing for the meeting, the board members had requested and received extensive information from UBS Global AM to assist them, including performance and expense information for other investment companies with similar investment objectives. The board received and considered a variety of information about UBS Global AM, as well as the advisory and administrative arrangements for the Fund. The Independent Directors discussed the materials initially provided by management prior to the scheduled board meeting in a session with their independent legal counsel and requested, and received from management, supplemental materials to assist them in their consideration of the Investment Advisory and Administration Agreement. The board received materials detailing the administrative services provided to the Fund by UBS Global AM, which include providing accounting and financial analysis, ensuring that all financial and tax regulatory reporting requirements were met, certifying required Securities and Exchange Commission documentation and monitoring the performance of the Fund's service providers. The Independent Directors also met for several hours the evening before the board meeting and met again after management's presentation was completed to review the disclosure that had been made to them at the meeting. At all of these sessions the Independent Directors met in session with their independent legal counsel. The Independent Directors also received a memorandum from their independent legal counsel discussing the duties of board members in considering approval of advisory and administration agreements. In its consideration of the approval of the Investment Advisory and Administration Agreement, the board considered the following factors: NATURE, EXTENT AND QUALITY OF THE SERVICES UNDER THE INVESTMENT ADVISORY AND ADMINISTRATION AGREEMENT--The board received and considered information regarding the nature, extent and quality of management services provided to the Fund by UBS Global AM (and its -------------------------------------------------------------------------------- 39 INSURED MUNICIPAL INCOME FUND INC. BOARD APPROVAL OF INVESTMENT ADVISORY AND ADMINISTRATION AGREEMENT (UNAUDITED) predecessor, UBS Global Asset Management (US) Inc.) under the Investment Advisory and Administration Agreement during the past year. The board also received a description of the administrative and other services rendered to the Fund and its shareholders by UBS Global AM. The board considered the nature, extent and quality of administrative and shareholder services performed by UBS Global AM and its affiliates. The board also considered the resources devoted to, and the record of compliance with, the Fund's compliance policies and procedures. The board noted that it received information at regular meetings throughout the year regarding the services rendered by UBS Global AM concerning the management of the Fund's affairs and UBS Global AM's role in coordinating providers of other services to the Fund, including custody, accounting and transfer agency services. The board's evaluation of the services provided by UBS Global AM took into account the board's knowledge and familiarity gained as board members of funds in the UBS New York Fund complex, including the scope and quality of UBS Global AM's investment management and other capabilities and the quality of its administrative and other services. The board observed that the scope of services provided by UBS Global AM had expanded over time as a result of regulatory and other developments, including maintaining and monitoring its own and the Fund's expanded compliance programs. The board had available to it the qualifications, backgrounds and responsibilities of the Fund's senior personnel at UBS Global AM and had received information regarding the persons primarily responsible for the day-to-day portfolio management of the Fund and recognized that the Fund's senior personnel at UBS Global AM report to the board regularly, some at every board meeting, and that at each regular meeting the board receives a report on the Fund's performance. The board also considered, based on its knowledge of UBS Global AM and its affiliates, the financial resources available to UBS Global AM and its parent organization, UBS AG. In that regard, the board received extensive financial information regarding UBS Global AM and noted that it was a wholly owned, indirect subsidiary of one of the largest financial services firms in the world. It was also noted that UBS Global AM had well over $100 billion in assets under management and was part of the UBS Global Asset Management Division, which had over $600 billion of assets under management worldwide. -------------------------------------------------------------------------------- 40 INSURED MUNICIPAL INCOME FUND INC. BOARD APPROVAL OF INVESTMENT ADVISORY AND ADMINISTRATION AGREEMENT (UNAUDITED) The board reviewed how transactions in Fund assets are effected. The board also reviewed the Fund's brokerage policies and practices, the standards applied in seeking best execution, policies and practices regarding soft dollars, the use of a broker affiliated with UBS Global AM and the existence of quality controls applicable to brokerage allocation procedures. In addition, UBS Global AM also reported to the board on, among other things, its disaster recovery plans and portfolio manager compensation plan. The board concluded that, overall, it was satisfied with the nature, extent and quality of services provided (and expected to be provided) to the Fund under the Investment Advisory and Administration Agreement. ADVISORY FEES AND EXPENSE RATIOS--The board reviewed and considered the contractual management fee ("Contractual Management Fee") payable by the Fund to UBS Global AM in light of the nature, extent and quality of the advisory and administrative services provided by UBS Global AM. The board also reviewed and considered the fee waiver arrangement in place for the Fund and considered the actual fee rate (after taking any waivers into account) (the "Actual Management Fee"). Additionally, the board received and considered information comparing the Fund's Contractual Management Fee, Actual Management Fee and overall expenses with those of funds in a group of funds selected and provided by Lipper, Inc. ("Lipper"), an independent provider of investment company data (the "Expense Group"). In connection with its consideration of the Fund's advisory fees, the board also received information on UBS Global AM's standard institutional account fees for accounts of a similar investment type to the Fund. The board noted that, in general, these fees were lower than the Contractual Management Fee and Actual Management Fee for the Fund, but also noted management's explanation that comparisons with such accounts may be of limited relevance given the different structures and regulatory requirements of mutual funds versus such accounts and the differences in the levels of services required by mutual funds and such accounts. The board also received information on fees charged to other mutual funds managed by UBS Global AM. In addition to the Contractual and Actual Management Fees, the board also reviewed and considered the total expenses for the Fund. The comparative -------------------------------------------------------------------------------- 41 INSURED MUNICIPAL INCOME FUND INC. BOARD APPROVAL OF INVESTMENT ADVISORY AND ADMINISTRATION AGREEMENT (UNAUDITED) Lipper information showed that the Fund's Contractual Management Fee, Actual Management Fee and total expenses were in the fifth quintile in the Fund's Expense Group for the comparison periods utilized in the Lipper report (with the first quintile representing that fifth of the funds in the Expense Group with the lowest level of fees or expenses, as applicable, and the fifth quintile representing that fifth of the funds in the Expense Group with the highest level of fees or expenses, as applicable). In light of the level of the Fund's fees and expenses, management proposed a revision in the management fee such that the management fee will be calculated only on the value of the net assets attributable to the Fund's common shares, rather than the net assets attributable to both the Fund's common and preferred shares. Management noted that this change should result in an anticipated reduction in the Fund's Actual Management Fee to 0.83% of net assets applicable to common shares from its current level of 1.005%, which would be at the median of its Expense Group. Management also explained that it had negotiated a reduction in the Fund's custodian fees such that the custodian fee rate will be based only on assets attributable to common shares and not on assets attributable to both common and preferred shares. Combined, these modifications should result in an anticipated reduction in the Fund's total expenses to approximately 0.99% of net assets applicable to common shares from its current level of 1.199%, which is below the median of its Expense Group. Taking all of the above into consideration, including the proposed reductions in the advisory fee and custodian fees, the board determined that the management fee was reasonable in light of the nature, extent and quality of the services provided to the Fund under the Investment Advisory and Administration Agreement. FUND PERFORMANCE--The board received and considered performance information of the Fund compared to other funds (the "Performance Universe") selected by Lipper over the one-, three-, five-, ten-year and since inception periods ended April 30, 2006. The board was provided with a description of the methodology Lipper used to determine the similarity of the Fund with the funds included in its Performance Universe. The board also noted that it had received information throughout the year at periodic intervals with respect to the Fund's performance, including in most cases with respect to its benchmark index. -------------------------------------------------------------------------------- 42 INSURED MUNICIPAL INCOME FUND INC. BOARD APPROVAL OF INVESTMENT ADVISORY AND ADMINISTRATION AGREEMENT (UNAUDITED) The comparative Lipper information showed that the Fund's performance was in the fourth quintile for the one-, three-, five- and ten-year periods and in the fifth quintile since inception (with the first quintile representing that fifth of the funds in the Performance Universe with the highest performance and the fifth quintile representing that fifth of the funds in the Performance Universe with the lowest performance). In its review, the board noted the Fund's performance as compared to the average return for the Fund's Performance Universe and benchmark index, taking the volatility in returns for the Performance Universe and the index into account. In addition, the board noted that in the past the Fund has been managed with a more conservative view when compared to its Performance Universe. Management noted that, as had been approved by the Board, it had taken certain steps to increase the Fund's exposure to interest rates by increasing the average life of the investments that it holds by one year. Management also noted that the Fund has increased its investment in lower quality issues within its allotted 20% non-insured, investment grade "bucket" and added approximately 8% exposure to AMT securities. Management explained that it believed that these initiatives were positive contributors to the Fund's performance and should make the Fund more competitive in the future as compared to its Performance Group. Management also noted that over the trailing 12 months, as of May 31, 2006, the Fund outperformed the Lipper median by 10 basis points before fees. Based on its review, and management's explanation and changes to the investment strategies of the Fund, the board concluded that the Fund's investment performance was acceptable. ADVISER PROFITABILITY--The board received and considered a profitability analysis of UBS Global AM and its affiliates in providing services to the Fund. The board also received profitability information with respect to the UBS New York fund complex as a whole. In addition, the board received information with respect to UBS Global AM's allocation methodologies used in preparing this profitability data. UBS Global AM's profitability was considered not excessive in light of the nature, extent and quality of the services provided to the Fund. ECONOMIES OF SCALE--The board received and considered information from management regarding whether it has achieved economies of scale with respect to the management of the Fund, whether the Fund has appropriately benefited from any economies of scale, and whether there is potential realization of further economies of scale. The board considered -------------------------------------------------------------------------------- 43 INSURED MUNICIPAL INCOME FUND INC. BOARD APPROVAL OF INVESTMENT ADVISORY AND ADMINISTRATION AGREEMENT (UNAUDITED) whether economies of scale in the provision of services to the Fund were being passed along to shareholders. The board also considered whether alternative fee structures (such as breakpoints) would be more appropriate or reasonable taking into consideration economies of scale or other efficiencies. In conducting its review, the board noted that the Fund's Contractual Management Fee did not contain any breakpoints. Further, the board noted that advisory agreements of closed-end funds usually do not contain breakpoints. Management informed the board that the Fund, as a closed-end investment company, was not expected to materially increase in size; thus, UBS Global AM would not benefit from economies of scale. The Board members considered whether economies of scale could be realized because UBS Global AM advises other similar funds, and, based on their experience, the board accepted UBS Global AM's explanation that significant economies of scale would not be realized because the nature of the market in which the Fund invests did not provide significant savings. OTHER BENEFITS TO UBS GLOBAL AM--The board considered other benefits received by UBS Global AM and its affiliates as a result of its relationship with the Fund, including the opportunity to offer additional products and services to Fund shareholders. In light of the costs of providing investment management, administrative and other services to the Fund and UBS Global AM's ongoing commitment to the Fund, the profits and other ancillary benefits that UBS Global AM and its affiliates received were considered reasonable. In light of all of the foregoing, the board approved the Advisory and Administration Agreement to continue for another year. In making its decision, the board identified no single factor as being determinative in approving the Investment Advisory and Administration Agreement. The Independent Directors were advised by separate independent legal counsel throughout the entire process. The board discussed the proposed continuance of the Investment Advisory and Administration Agreement in a private session with their independent legal counsel at which no representatives of UBS Global AM were present. -------------------------------------------------------------------------------- 44 (This page has been left blank intentionally) -------------------------------------------------------------------------------- 45 (This page has been left blank intentionally) -------------------------------------------------------------------------------- 46 (This page has been left blank intentionally) -------------------------------------------------------------------------------- 47 (This page has been left blank intentionally) -------------------------------------------------------------------------------- 48 DIRECTORS Richard Q. Armstrong Meyer Feldberg Chairman Bernard H. Garil Alan S. Bernikow Richard R. Burt Heather R. Higgins PRINCIPAL OFFICERS Kai R. Sotorp EIbridge T. Gerry III President Vice President Mark F. Kemper Kevin McIntyre Vice President and Secretary Vice President Thomas Disbrow Vice President and Treasurer INVESTMENT ADVISOR AND ADMINISTRATOR UBS Global Asset Management (Americas) Inc. 51 West 52nd Street New York, New York 10019-6114 The financial information included herein is taken from the records of the Fund without examination by independent registered public accountants who do not express an opinion thereon. Notice is hereby given in accordance with Section 23(c) of the Investment Company Act of 1940 that from time to time the Fund may purchase shares of its common stock in the open market at market prices. This report is sent to the shareholders of the Fund for their information. It is not a prospectus, circular or representation intended for use in the purchase or sale of shares of the Fund or of any securities mentioned in this report. (C) 2006 UBS Global Asset Management (Americas) Inc. All rights reserved. [LOGO OF UBS] UBS --------------- PRESORTED STANDARD U.S. POSTAGE PAID COMPUTERSHARE --------------- UBS GLOBAL ASSET MANAGEMENT (AMERICAS) INC. 51 West 52nd Street New York, New York 10019-6114 ITEM 2. CODE OF ETHICS. ----------------------- Form N-CSR disclosure requirement not applicable to this filing of a semi-annual report. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. ----------------------------------------- Form N-CSR disclosure requirement not applicable to this filing of a semi-annual report. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. ----------------------------------------------- Form N-CSR disclosure requirement not applicable to this filing of a semi-annual report. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. ---------------------------------------------- Form N-CSR disclosure requirement not applicable to this filing of a semi-annual report. ITEM 6. SCHEDULE OF INVESTMENTS. -------------------------------- Included as part of the report to shareholders filed under Item 1 of this form. ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END ------------------------------------------------------------------------- MANAGEMENT INVESTMENT COMPANIES. -------------------------------- Form N-CSR disclosure requirement not applicable to this filing of a semi-annual report. ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES. ------------------------------------------------------------------------- Form N-CSR disclosure requirement not applicable to this filing of a semi-annual report. ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT -------------------------------------------------------------------------- COMPANY AND AFFILIATED PURCHASERS. ---------------------------------- There were no purchases made by or on behalf of the registrant or any "affiliated purchaser," as defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934, as amended, of shares of the registrant's equity securities made in the period covered by this report. ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS. ------------------------------------------------------------- The registrant's Board has established a Nominating and Corporate Governance Committee. The Nominating and Corporate Governance Committee will consider nominees recommended by shareholders if a vacancy occurs among those board members who are not "interested persons" as defined in Section 2(a)(19) of the Investment Company Act of 1940, as amended. In order to recommend a nominee, a shareholder should send a letter to the chairperson of the Nominating and Corporate Governance Committee, Richard R. Burt, care of the Secretary of the registrant at UBS Global Asset Management, 51 West 52nd Street, New York, New York 10019-6114, and indicate on the envelope "Nominating and Corporate Governance Committee." The shareholder's letter should state the nominee's name and should include the nominee's resume or curriculum vitae, and must be accompanied by a written consent of the individual to stand for election if nominated for the Board and to serve if elected by shareholders. ITEM 11. CONTROLS AND PROCEDURES. --------------------------------- (a) The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended) are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this document. (b) The registrant's principal executive officer and principal financial officer are aware of no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940, as amended) that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 12. EXHIBITS. ------------------ (a) (1) Code of Ethics - Form N-CSR disclosure requirement not applicable to this filing of a semi-annual report. (a) (2) Certifications of principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 is attached hereto as Exhibit EX-99.CERT. (a) (3) Written solicitation to purchase securities under Rule 23c-1 under the Investment Company Act of 1940 sent or given during the period covered by the report by or on behalf of the registrant to 10 or more persons - The registrant has not engaged in such a solicitation during the period covered by this report. (b) Certifications of principal executive officer and principal financial officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 is attached hereto as Exhibit EX-99.906CERT. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Insured Municipal Income Fund Inc. By: /s/ Kai R. Sotorp ----------------- Kai R. Sotorp President Date: November 29, 2006 ----------------- Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ Kai R. Sotorp ----------------- Kai R. Sotorp President Date: November 29, 2006 ----------------- By: /s/ Thomas Disbrow ------------------ Thomas Disbrow Vice President and Treasurer Date: November 29, 2006 -----------------