UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 2054 ---------------------- SCHEDULE 13G Under the Securities Exchange Act of 1934 Five Star Quality Care, Inc. (Name of Issuer) Common Stock, par value $0.01 per share (Title of Class of Securities) 33832D106 (CUSIP Number) July 19, 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 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) 4.61% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** OO ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G 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 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 127,295 shares of Common Stock OWNED BY -------------------------------------------------------- EACH (7) SOLE DISPOSITIVE POWER 0 REPORTING -------------------------------------------------------- PERSON WITH (8) SHARED DISPOSITIVE POWER 127,295 shares of Common Stock ----------------------------------------------------------------------- (9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 127,295 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) 0.40% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** PN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G Page 5 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 127,295 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 127,295 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 127,295 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) 5.26% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** OO ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G Page 6 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 127,295 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 127,295 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 127,295 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) 5.26% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** IN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G Page 7 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 127,295 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 127,295 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 127,295 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) 5.26% ----------------------------------------------------------------------- (12) TYPE OF REPORTING PERSON ** IN ----------------------------------------------------------------------- ** SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP No. 33832D106 13G Page 8 of 13 Pages Item 1. (a) Name of Issuer Five Star Quality Care, Inc. (the "Company"). (b) Address of Issuer's Principal Executive Offices 400 Centre Street Newton, Massachusetts 02458 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 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 Citizenship: United States Item 2(d) Title of Class of Securities Common Stock, $0.01 par value ("Common Stock") CUSIP No. 33832D106 13G Page 9 of 13 Pages Item 2(e) CUSIP Number 33832D106 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a: (a) [ ] Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o). (b) [ ] Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c). (c) [ ] Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c). (d) [ ] Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8). (e) [ ] An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E); (f) [ ] An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F); (g) [ ] A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G); (h) [ ] A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) [ ] A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3); (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J). If this statement is filed pursuant to Rule 13d-1(c), check this box. [X] 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 127,295 shares of Common Stock and (iv) 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 127,295 shares of Common Stock held by Highbridge Statistical Opportunities Master Fund, L.P. CUSIP No. 33832D106 13G Page 10 of 13 Pages Highbridge Capital Management, LLC is the trading manager of Highbridge International LLC, Highbridge Convertible Arbitrage Master Fund, L.P. and Highbridge Statistical Opportunities Master Fund, L.P. Glenn Dubin is a Co-Chief Executive Officer of Highbridge Capital Management, LLC. Henry Swieca is a Co-Chief Executive 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. and Highbridge Statistical Opportunities Master Fund, L.P. (b) Percent of class: The Company's Quaterly Report filed on Form 10-Q on May 10, 2007, indicates that as of May 10, 2007, there were 31,684,134 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 4.61% 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 0.40% of the outstanding shares of Common Stock of the Company and (iv) each of Highbridge Capital Management, LLC, Glenn Dubin and Henry Swieca may be deemed to beneficially own 5.26% of the outstanding shares of Common Stock of the Company. 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. (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 5. Ownership of Five Percent or Less of a Class Not applicable. Item 6. Ownership of More than Five Percent on Behalf of Another Person Not applicable. CUSIP No. 33832D106 13G Page 11 of 13 Pages Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person Not applicable. Item 8. Identification and Classification of Members of the Group See Exhibit I. Item 9. Notice of Dissolution of Group Not applicable. 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 July 27, 2007, by and among Highbridge International LLC, Highbridge Convertible Arbitrage Master Fund, L.P., Highbridge Statistical Opportunities Master Fund, L.P., Highbridge Capital Management, LLC, Glenn Dubin and Henry Swieca. CUSIP No. 33832D106 13G 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: July 27, 2007 HIGHBRIDGE CAPITAL MANAGEMENT, LLC HIGHBRIDGE INTERNATIONAL LLC By: Highbridge Capital Management, LLC its Trading Manager By: /s/ Carolyn Rubin -------------------------- By: /s/ Carolyn Rubin Name: Carolyn Rubin -------------------------- Title: Managing Director Name: Carolyn Rubin 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/ Carolyn Rubin By: /s/ Carolyn Rubin -------------------------- -------------------------- Name: Carolyn Rubin Name: Carolyn Rubin Title: Managing Director Title: Managing Director /s/ Glenn Dubin /s/ Henry Swieca -------------------------- -------------------------- GLENN DUBIN HENRY SWIECA CUSIP No. 33832D106 13G 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 as of July 27, 2007 HIGHBRIDGE CAPITAL MANAGEMENT, LLC HIGHBRIDGE INTERNATIONAL LLC By: Highbridge Capital Management, LLC its Trading Manager By: /s/ Carolyn Rubin -------------------------- By: /s/ Carolyn Rubin Name: Carolyn Rubin -------------------------- Title: Managing Director Name: Carolyn Rubin 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/ Carolyn Rubin By: /s/ Carolyn Rubin -------------------------- -------------------------- Name: Carolyn Rubin Name: Carolyn Rubin Title: Managing Director Title: Managing Director /s/ Glenn Dubin /s/ Henry Swieca -------------------------- -------------------------- GLENN DUBIN HENRY SWIECA