SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a) (Amendment No. 20) CAPSTEAD MORTGAGE CORPORATION ------------------------------------------------------- (Name of Issuer) COMMON STOCK, PAR VALUE $0.01 PER SHARE ----------------------------------------------------------- (Title of Class of Securities) 14067E 40 7 ---------------------------------------------------------------- (CUSIP Number) Randal A. Nardone Chief Operating Officer and Secretary Fortress Registered Investment Trust sole member of Fortress CAP LLC 1251 Avenue of the Americas New York, New York 10020 (212) 798-6100 ----------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) Copy to: J. Gregory Milmoe Skadden, Arps, Slate, Meagher & Flom LLP Four Times Square New York, New York 10036-6522 (212) 735-3000 June 5, 2003 ----------------------------------------------------------------- (Date of Event Which Requires Filing of This Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d(f) or 13d-1(g), check the following box |_|. (Page 1 of 12 Pages) CUSIP No. 14067E 40 7 13D Page 2 of 12 Pages ------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Fortress CAP LLC ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| Not applicable (b) |_| ------------------------------------------------------------------------------- 3 SEC USE ONLY ------------------------------------------------------------------------------- 4 SOURCE OF FUNDS Not applicable ------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) |_| ------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- NUMBER OF SHARES 7 SOLE VOTING POWER - 0 - BENEFICIALLY OWNED ------------------------------------------------------ BY EACH REPORTING PERSON 8 SHARED VOTING POWER - 356,959 - WITH ------------------------------------------------------ 9 SOLE DISPOSITIVE POWER - 0 - ------------------------------------------------------ 10 SHARED DISPOSITIVE POWER - 356,959 - ------------------------------------------------------ 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 356,959 - ------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| ------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.5% (based on 14,014,044 shares of Common Stock outstanding as of May 7, 2003) ------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO ------------------------------------------------------------------------------- CUSIP No. 14067E 40 7 13D Page 3 of 12 Pages ------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Fortress Registered Investment Trust ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| Not applicable (b) |_| ------------------------------------------------------------------------------- 3 SEC USE ONLY ------------------------------------------------------------------------------- 4 SOURCE OF FUNDS WC ------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) |_| ------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- NUMBER OF 7 SOLE VOTING POWER - 0 - SHARES ------------------------------------------------------ BENEFICIALLY 8 SHARED VOTING POWER - 356,959 - OWNED BY EACH ------------------------------------------------------ REPORTING 9 SOLE DISPOSITIVE POWER - 0 - PERSON WITH ------------------------------------------------------ 10 SHARED DISPOSITIVE POWER - 356,959 - ------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 356,959 - ------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| ------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.5% (based on 14,014,044 shares of Common Stock outstanding as of May 7, 2003) ------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO ------------------------------------------------------------------------------- CUSIP No. 14067E 40 7 13D Page 4 of 12 Pages ------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Fortress Investment Fund LLC ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| Not applicable (b) |_| ------------------------------------------------------------------------------- 3 SEC USE ONLY ------------------------------------------------------------------------------- 4 SOURCE OF FUNDS Not applicable ------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) |_| ------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- NUMBER OF 7 SOLE VOTING POWER - 0 - SHARES BENEFICIALLY ------------------------------------------------------ OWNED BY 8 SHARED VOTING POWER - 356,959 - EACH REPORTING ------------------------------------------------------ PERSON WITH 9 SOLE DISPOSITIVE POWER - 0 - ------------------------------------------------------ 10 SHARED DISPOSITIVE POWER - 356,959 - ------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 356,959 - ------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| ------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.5% (based on 14,014,044 shares of Common Stock outstanding as of May 7, 2003) ------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO ------------------------------------------------------------------------------- CUSIP No. 14067E 40 7 13D Page 5 of 12 Pages ------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Fortress Investment Group LLC ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| Not applicable (b) |_| ------------------------------------------------------------------------------- 3 SEC USE ONLY ------------------------------------------------------------------------------- 4 SOURCE OF FUNDS Not applicable ------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) |_| ------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- NUMBER OF 7 SOLE VOTING POWER - 0 - SHARES BENEFICIALLY ------------------------------------------------------ OWNED BY 8 SHARED VOTING POWER - 356,959 - EACH REPORTING ------------------------------------------------------ PERSON WITH 9 SOLE DISPOSITIVE POWER - 0 - ------------------------------------------------------ 10 SHARED DISPOSITIVE POWER - 356,959 - ------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 356,959 - ------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| ------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.5% (based on 14,014,044 shares of Common Stock outstanding as of May 7, 2003) ------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO ------------------------------------------------------------------------------- CUSIP No. 14067E 40 7 13D Page 6 of 12 Pages ------------------------------------------------------------------------------- 1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) Fortress Principal Investment Holdings LLC ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| Not applicable (b) |_| ------------------------------------------------------------------------------- 3 SEC USE ONLY ------------------------------------------------------------------------------- 4 SOURCE OF FUNDS Not applicable ------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) |_| ------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- NUMBER OF 7 SOLE VOTING POWER - 0 - SHARES BENEFICIALLY ------------------------------------------------------ OWNED BY 8 SHARED VOTING POWER - 356,959 - EACH REPORTING ------------------------------------------------------ PERSON WITH 9 SOLE DISPOSITIVE POWER - 0 - ------------------------------------------------------ 10 SHARED DISPOSITIVE POWER - 356,959 - ------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 356,959 - ------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| ------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.5% (based on 14,014,044 shares of Common Stock outstanding as of May 7, 2003) ------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON CO ------------------------------------------------------------------------------- This Amendment No. 20 (this "Amendment") to the Statement on Schedule 13D dated January 21, 2000, as amended by Amendment No. 1 thereto dated February 22, 2000, Amendment No. 2 thereto dated July 12, 2000, Amendment No. 3 thereto dated September 8, 2000, Amendment No. 4 thereto dated October 31, 2000, Amendment No. 5 thereto dated January 9, 2001, Amendment No. 6 thereto dated December 3, 2001, Amendment No. 7 thereto dated March 4, 2003, Amendment No. 8 thereto dated March 20, 2003, Amendment No. 9 thereto dated March 24, 2003, Amendment No. 10 thereto dated March 25, 2003, Amendment No. 11 thereto dated March 26, 2003, Amendment No. 12 thereto dated March 27, 2003, Amendment No. 13 thereto dated May 8, 2003, Amendment No. 14 thereto dated May 14, 2003, Amendment No. 15 thereto dated May 21, 2003, Amendment No. 16 thereto dated May 22, 2003, Amendment No. 17 thereto dated May 27, 2003, Amendment No. 18 thereto dated May 28, 2003 and Amendment No. 19 thereto dated June 5, 2003 (as so amended, the "Schedule 13D") filed by Fortress CAP LLC, a Delaware limited liability company ("Fortress CAP"), Fortress Registered Investment Trust, a Delaware business trust ("Fortress Trust"), Fortress Investment Fund LLC, a Delaware limited liability company ("Fortress Fund"), Fortress Investment Group LLC, a Delaware limited liability company ("Fortress Group"), and Fortress Principal Investment Holdings LLC, a Delaware limited liability company ("FPIH"), relates to the common stock, par value $0.01 per share (the "Common Stock"), of Capstead Mortgage Corporation, a Maryland corporation ("Capstead"). This Amendment is filed jointly by Fortress CAP, Fortress Trust, Fortress Fund, Fortress Group and FPIH (collectively, the "Reporting Persons"). All capitalized terms used but not defined herein have the meanings ascribed to them in the Schedule 13D. Item 5. Item 5 of the Schedule 13D is hereby amended and supplemented to add the following: On June 5, 2003, in a privately negotiated block transaction, Fortress CAP sold 500,800 shares of Common Stock at $11.3693 per share, yielding aggregate net proceeds of $5,693,754.44. After this sale, Fortress CAP was the direct beneficial owner of 356,959 shares of Common Stock, which represents approximately 2.5% of the outstanding Common Stock. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. June 6, 2003 FORTRESS CAP LLC By: /s/ Randal A. Nardone --------------------------------- Randal A. Nardone, as Chief Operating Officer and Secretary of Fortress Registered Investment Trust, sole member of Fortress CAP LLC SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. June 6, 2003 FORTRESS REGISTERED INVESTMENT TRUST By: /s/ Randal A. Nardone ----------------------------------- Randal A. Nardone, as Chief Operating Officer and Secretary of Fortress Registered Investment Trust SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. June 6, 2003 FORTRESS INVESTMENT FUND LLC By: /s/ Randal A. Nardone ------------------------------------- Randal A. Nardone, as Chief Operating Officer and Secretary of Fortress Fund MM LLC, managing member of Fortress Investment Fund LLC SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. June 6, 2003 FORTRESS INVESTMENT GROUP LLC By: /s/ Randal A. Nardone --------------------------------- Randal A. Nardone, as Chief Operating Officer and Secretary of Fortress Investment Group LLC SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. June 6, 2003 FORTRESS PRINCIPAL INVESTMENT HOLDINGS LLC By: /s/ Randal A. Nardone ------------------------------- Randal A. Nardone, as Secretary