UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ---------------------- SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* Odyssey Marine Exploration, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 676118102 (CUSIP Number) December 31, 2009 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [X] Rule 13d-1(c) [ ] Rule 13d-1(d) ---------------- *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Page 1 of 7 Pages CUSIP No. 676118102 13G/A Page 2 of 7 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS GLG North American Opportunity Fund ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 2,382,514 Shares 174,000 Preferred Shares, convertible into 174,000 Shares OWNED BY ------------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER 2,382,514 Shares 174,000 Preferred Shares, convertible into 174,000 Shares ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,382,514 Shares 174,000 Preferred Shares, convertible into 174,000 Shares ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.30% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON OO CUSIP No. 676118102 13G/A Page 3 of 7 Pages --------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS GLG Partners LP ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION United Kingdom ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares OWNED BY ------------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------------- PERSON WITH: (8) SHARED DISPOSITIVE POWER 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.81% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN ----------------------------------------------------------------------- CUSIP No. 676118102 13G/A Page 4 of 7 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) GLG Partners Limited ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION United Kingdom ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares OWNED BY ------------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------------- PERSON WITH: (8) SHARED DISPOSITIVE POWER 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.81% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) IA, HC ----------------------------------------------------------------------- CUSIP No. 676118102 13G/A Page 5 of 7 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) GLG Partners, Inc. ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES ------------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares OWNED BY ------------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING ------------------------------------------------------------- PERSON WITH: (8) SHARED DISPOSITIVE POWER 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,251,838 Shares 206,400 Preferred Shares, convertible into 206,400 Shares ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.81% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) CO ----------------------------------------------------------------------- CUSIP No. 676118102 13G/A Page 6 of 7 Pages This Amendment No. 4 (this "Amendment") amends the statement on Schedule 13G filed on March 21, 2005 (the "Original Schedule 13G"), as amended by Amendment No.1 filed on February 14, 2007, as further amended by Amendment No. 2 filed on February 14, 2008, and Amendment No. 3 filed on February 6, 2009(the "Original Schedule 13G" as amended, the "Schedule 13G") with respect to shares of Common Stock, par value $0.0001 per share (the "Shares") of Odyssey Marine Exploration, Inc., a Nevada corporation (the "Company"). Capitalized terms used herein and not otherwise defined in this Amendment have the meanings set forth in the Schedule 13G. This Amendment amends and restates Items 4 and 5 in their entirety as set forth below. Item 4. Ownership Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. The information required by Items 4(a) - (c) is set forth in Rows 5 - 11 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. Based upon the Company's Quarterly Report filed on Form 10-Q on November 9, 2009, for the quarterly period ended September 30, 2009, the Company had 59,326,194 Shares outstanding as of October 27, 2009. In calculating the percentage of Shares held by the Reporting Persons, we assumed the conversion of the reported convertible preferred stock. The Investment Manager, which serves as the investment manager to each of the GLG Funds, may be deemed to be the beneficial owner of all Shares owned by the GLG Funds. The Investment Manager exercises its investment authority directly or indirectly through various entities, including, without limitation, GLG Inc. The General Partner, as general partner to the Investment Manager, may be deemed to be the beneficial owner of all Shares owned by the GLG Funds. Each of Emmanuel Roman, Pierre Lagrange and Noam Gottesman are Managing Directors of the General Partner. The Parent Company, which indirectly wholly owns the General Partner, may be deemed to be the beneficial owner of all Shares owned by the GLG Funds. Each of the Investment Manager, the General Partner, the Parent Company, GLG Inc., Emmanuel Roman, Pierre Lagrange and Noam Gottesman hereby disclaims any beneficial ownership of any such Shares, except for their pecuniary interest therein. Item 5. Ownership of Five Percent or Less of a Class As of December 31, 2009, GLG North American Opportunity Fund had ceased to be a Reporting Person with respect to the Shares. CUSIP No. 676118102 13G/A Page 7 of 7 Pages SIGNATURES After reasonable inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information with respect to it set forth in this statement is true, complete, and correct. Dated: February 11, 2010 GLG NORTH AMERICAN OPPORTUNITY FUND By: GLG Partners LP, its Investment Manager GLG PARTNERS LP Individually and in its capacity as Investment Manager of North American Opportunity Fund By: /s/ Victoria Parry -------------------------------- Name: Victoria Parry Title: Senior Legal Counsel of GLG Partners LP GLG PARTNERS LIMITED Individually and in its capacity as General Partner of GLG Partners LP By: /s/ Emmanuel Roman -------------------------------- Name: Emmanuel Roman Title: Managing Director GLG PARTNERS, INC. By: /s/ Alejandro R. San Miguel -------------------------------- Name: Alejandro R. San Miguel Title: General Counsel and Corporate Secretary