UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ---------------------- SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Five Star Quality Care, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 33832D106 (CUSIP Number) December 31, 2007 (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 purpose 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 13 Pages CUSIP No. 33832D106 13G/A Page 2 of 13 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS Highbridge International LLC ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands, British West Indies ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES -------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER $19,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,461,538 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER $19,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,461,538 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON $19,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,461,538 shares of Common Stock ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.41% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** OO ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G/A Page 3 of 13 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS Highbridge Convertible Arbitrage Master Fund, L.P. ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands, British West Indies ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES -------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER $1,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 76,923 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER $1,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 76,923 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON $1,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 76,923 shares of Common Stock ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.24% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** PN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G/A Page 4 of 13 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS Highbridge Statistical Opportunities Master Fund, L.P. ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands, British West Indies ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES -------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 165,484 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER 165,484 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 165,484 shares of Common Stock ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.52% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** PN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G/A Page 5 of 13 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS STAR, L.P. (a statistical arbitrage strategy) ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands, British West Indies ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES -------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 38,233 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER 38,233 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 38,233 shares of Common Stock ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.12% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** PN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G/A Page 6 of 13 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS Highbridge Capital Management, LLC 20-1901985 ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION State of Delaware ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES -------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.24% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** OO ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G/A Page 7 of 13 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS Glenn Dubin ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES -------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.24% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** IN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G/A Page 8 of 13 Pages ----------------------------------------------------------------------- (1) NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS Henry Swieca ----------------------------------------------------------------------- (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** (a) [X] (b) [ ] ----------------------------------------------------------------------- (3) SEC USE ONLY ----------------------------------------------------------------------- (4) CITIZENSHIP OR PLACE OF ORGANIZATION United States ----------------------------------------------------------------------- NUMBER OF (5) SOLE VOTING POWER 0 SHARES -------------------------------------------------------- BENEFICIALLY (6) SHARED VOTING POWER 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 203,717 shares of Common Stock $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock ----------------------------------------------------------------------- (10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES ** [ ] ----------------------------------------------------------------------- (11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.24% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** IN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G/A Page 9 of 13 Pages This Amendment No. 1 (this "Amendment") amends the statement on Schedule 13G filed on July 27, 2007 (as amended, the "Schedule 13G") with respect to the shares of common stock, par value $0.01 per share (the "Common Stock") of Five Star Quality Care, Inc., a Maryland 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 2(a), 2(b), 2(c), 4 and 10 in their entirety as set forth below. Item 2(a). Name of Person Filing Item 2(b). Address of Principal Business Office Item 2(c). Citizenship HIGHBRIDGE INTERNATIONAL LLC c/o Harmonic Fund Services The Cayman Corporate Centre, 4th Floor 27 Hospital Road Grand Cayman, Cayman Islands, British West Indies Citizenship: Cayman Islands, British West Indies HIGHBRIDGE CONVERTIBLE ARBITRAGE MASTER FUND, L.P. c/o Harmonic Fund Services The Cayman Corporate Centre, 4th Floor 27 Hospital Road Grand Cayman, Cayman Islands, British West Indies Citizenship: Cayman Islands, British West Indies HIGHBRIDGE STATISTICAL OPPORTUNITIES MASTER FUND, L.P. c/o Harmonic Fund Services The Cayman Corporate Centre, 4th Floor 27 Hospital Road Grand Cayman, Cayman Islands, British West Indies Citizenship: Cayman Islands, British West Indies STAR, L.P. (A STATISTICAL ARBITRAGE STRATEGY) c/o Harmonic Fund Services The Cayman Corporate Centre, 4th Floor 27 Hospital Road Grand Cayman, Cayman Islands, British West Indies Citizenship: Cayman Islands, British West Indies HIGHBRIDGE CAPITAL MANAGEMENT, LLC IRS #: 20-1901985 9 West 57th Street, 27th Floor New York, New York 10019 Citizenship: State of Delaware GLENN DUBIN c/o Highbridge Capital Management, LLC 9 West 57th Street, 27th Floor New York, New York 10019 Citizenship: United States HENRY SWIECA c/o Highbridge Capital Management, LLC 9 West 57th Street, 27th Floor New York, New York 10019 CUSIP No. 33832D106 13G/A Page 10 of 13 Pages Citizenship: United States 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. (a) Amount beneficially owned: As of the date of this filing, (i) Highbridge International LLC is the beneficial owner of $19,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,461,538 shares of Common Stock, (ii) Highbridge Convertible Arbitrage Master Fund, L.P. is the beneficial owner of $1,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 76,923 shares of Common Stock, (iii) Highbridge Statistical Opportunities Master Fund, L.P. is the beneficial owner of 165,484 shares of Common Stock, (iv) STAR, L.P. (a statistical arbitrage strategy) is the beneficial owner of 38,233 shares of Common Stock and (v) each of Highbridge Capital Management, LLC, Glenn Dubin and Henry Swieca may be deemed the beneficial owner of the $20,000,000 principal amount of 3.75% Convertible Senior Notes due 2026, convertible into 1,538,462 shares of Common Stock held by Highbridge International LLC and Highbridge Convertible Arbitrage Master Fund, L.P. and the 203,717 shares of Common Stock held by Highbridge Statistical Opportunities Master Fund, L.P. and STAR, L.P. (a statistical arbitrage strategy). Highbridge Capital Management, LLC is the trading manager of Highbridge International LLC, Highbridge Convertible Arbitrage Master Fund, L.P., Highbridge Statistical Opportunities Master Fund, L.P. and STAR, L.P. (a statistical arbitrage strategy). Glenn Dubin is the Chief Executive Officer of Highbridge Capital Management, LLC. Henry Swieca is the Chief Investment Officer of Highbridge Capital Management, LLC. The foregoing should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of shares of Common Stock owned by another Reporting Person. In addition, each of Highbridge Capital Management, LLC, Glenn Dubin and Henry Swieca disclaims beneficial ownership of shares of Common Stock held by Highbridge International LLC, Highbridge Convertible Arbitrage Master Fund, L.P., Highbridge Statistical Opportunities Master Fund, L.P. and STAR, L.P. (a statistical arbitrage strategy). (b) Percent of class: The Company's Quarterly Report filed on Form 10-Q for the quarterly period ended September 30, 2007 indicates that as of November 7, 2007, there were 31,708,134 shares of Common Stock outstanding. Therefore, based on the Company's outstanding shares of Common Stock and assuming the conversion of the 3.75% Convertible Senior Notes due 2026, (i) Highbridge International LLC may be deemed to beneficially own 4.41% of the outstanding shares of Common Stock of the Company, (ii) Highbridge Convertible Arbitrage Master Fund, L.P. may be deemed to beneficially own 0.24% of the outstanding shares of Common Stock of the Company, (iii) Highbridge Statistical Opportunities Master Fund, L.P. may be deemed to beneficially own 0.52% of the outstanding shares of Common Stock of the Company, (iv) STAR, L.P. (a statistical arbitrage strategy) may be deemed to beneficially own 0.12% of the outstanding shares of Common Stock of the Company, and (v) each of Highbridge Capital Management, LLC, Glenn Dubin and Henry Swieca may be deemed to beneficially own 5.24% of the outstanding shares of Common Stock of the Company. The foregoing should not be construed in and of itself as CUSIP No. 33832D106 13G/A Page 11 of 13 Pages an admission by any Reporting Person as to beneficial ownership of shares of Common Stock owned by another Reporting Person. (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote 0 (ii) Shared power to vote or to direct the vote See Item 4(a) (iii) Sole power to dispose or to direct the disposition of 0 (iv) Shared power to dispose or to direct the disposition of See Item 4(a) Item 10. Certification By signing below each of the undersigned certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. Exhibits: Exhibit I: Joint Filing Agreement, dated as of January 23, 2008, by and among Highbridge International LLC, Highbridge Convertible Arbitrage Master Fund, L.P., Highbridge Statistical Opportunities Master Fund, L.P., STAR, L.P. (a statistical arbitrage strategy), Highbridge Capital Management, LLC, Glenn Dubin and Henry Swieca. CUSIP No. 33832D106 13G/A Page 12 of 13 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: January 23, 2008 HIGHBRIDGE CAPITAL MANAGEMENT, LLC HIGHBRIDGE INTERNATIONAL LLC By: Highbridge Capital Management, LLC its Trading Manager By: /s/ Noah Greenhill -------------------------------- Name: Noah Greenhill By: /s/ Noah Greenhill Title: Managing Director ---------------------------------- Name: Noah Greenhill Title: Managing Director HIGHBRIDGE CONVERTIBLE ARBITRAGE HIGHBRIDGE STATISTICAL OPPORTUNITIES MASTER FUND, L.P. MASTER FUND, L.P. By: Highbridge Capital Management, LLC By: Highbridge Capital Management, LLC its Trading Manager its Trading Manager By: /s/ Noah Greenhill By: /s/ Noah Greenhill -------------------------------- ---------------------------------- Name: Noah Greenhill Name: Noah Greenhill Title: Managing Director Title: Managing Director STAR, L.P. By: Highbridge Capital Management, LLC its Trading Manager /s/ Glenn Dubin -------------------------------- GLENN DUBIN By: /s/ Noah Greenhill ---------------------------- Name: Noah Greenhill Title: Managing Director /s/ Henry Swieca -------------------------------- HENRY SWIECA CUSIP No. 33832D106 13G/A Page 13 of 13 Pages EXHIBIT I JOINT FILING AGREEMENT This will confirm the agreement by and among the undersigned that the Schedule 13G filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the shares of Common Stock, $0.01 par value, of Five Star Quality Care, Inc., is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Dated: January 23, 2008 HIGHBRIDGE CAPITAL MANAGEMENT, LLC HIGHBRIDGE INTERNATIONAL LLC By: Highbridge Capital Management, LLC its Trading Manager By: /s/ Noah Greenhill -------------------------------- Name: Noah Greenhill By: /s/ Noah Greenhill Title: Managing Director ---------------------------------- Name: Noah Greenhill Title: Managing Director HIGHBRIDGE CONVERTIBLE ARBITRAGE HIGHBRIDGE STATISTICAL OPPORTUNITIES MASTER FUND, L.P. MASTER FUND, L.P. By: Highbridge Capital Management, LLC By: Highbridge Capital Management, LLC its Trading Manager its Trading Manager By: /s/ Noah Greenhill By: /s/ Noah Greenhill -------------------------------- ---------------------------------- Name: Noah Greenhill Name: Noah Greenhill Title: Managing Director Title: Managing Director STAR, L.P. By: Highbridge Capital Management, LLC its Trading Manager /s/ Glenn Dubin -------------------------------- GLENN DUBIN By: /s/ Noah Greenhill ---------------------------- Name: Noah Greenhill Title: Managing Director /s/ Henry Swieca -------------------------------- HENRY SWIECA