X0306 4 2013-05-22 0 0001005010 ARTHROCARE CORP ARTC 0001471604 OEP AC Holdings, LLC C/O ARTHROCARE CORPORATION 7500 RIALTO BLVD, BUILDING TWO, STE 100 AUSTIN TX 78735 0 0 1 0 0001448689 OEP General Partner III, L.P. C/O ARTHROCARE CORPORATION 7500 RIALTO BLVD, BUILDING TWO, STE 100 AUSTIN TX 78735 0 0 1 0 0001509226 OEP Parent LLC C/O ARTHROCARE CORPORATION 7500 RIALTO BLVD, BUILDING TWO, STE 100 AUSTIN TX 78735 0 0 1 0 0001266798 ONE EQUITY PARTNERS LLC C/O ARTHROCARE CORPORATION 7500 RIALTO BLVD, BUILDING TWO, STE 100 AUSTIN TX 78735 0 0 1 0 Restricted Stock Units 2013-05-22 4 A 0 6600 0 A Common Stock 6600 6600 I By One Equity Partners III, L.P. See Footnotes Each restricted stock unit represents a contingent right to receive one share of ArthoCare Corporation (the "Issuer") common stock. The restricted stock units vest over a three year period, with an initial 33.33% of such award vesting on May 22, 2014 (the "Initial Vesting Date") and 33.33% of such award vesting on each of the successive two anniversaries of the Initial Vesting Date. Vested restricted stock units will be delivered to Messrs. Belinfanti and Ahrens upon their respective retirements. Each of Mr. Gregory A. Belinfanti and Mr. Christian P. Ahrens serves as a director of the Issuer and as an officer of OEP AC Holdings, LLC, a Delaware limited liability company ("OEP"). The managing member of OEP is One Equity Partners III, L.P., a Cayman Islands limited partnership ("OEP III"), of which the sole general partner is OEP General Partner III, L.P., a Cayman Islands limited partnership ("OEP GP III"), of which the sole general partner is OEP Parent LLC, a Delaware limited liability company ("OEP Parent"), of which the sole member is OEP Holding Corporation, a Delaware corporation ("OEP Holding") of which the sole stockholder is JPMorgan Capital Corporation, a Delaware corporation ("JPM CC"), of which the sole stockholder is Banc One Financial LLC, a Delaware limited liability company ("BOF LLC"), of which the sole member is JPMorgan Chase & Co., a Delaware corporation. The reported shares consist of (i) 3,300 restricted stock units granted to Mr. Belinfanti and held by him on behalf of OEP III and (ii) 3,300 restricted stock units granted to Mr. Ahrens and held by him on behalf of OEP III, pursuant to the Issuer's Amended and Restated 2003 Incentive Stock Plan in consideration of Mr. Belinfanti's and Mr. Ahrens' service on the Board of Directors of the Issuer. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein. Exhibit List Exhibit 99 - Joint Filer Information /s/ Christian P. Ahrens Vice-President & Treasurer of OEP AC Holdings, LLC 2013-05-23