X0306 4 2017-03-02 0 0000709283 QUANTUM CORP /DE/ QTM 0001584386 Powers Gregg J C/O QUANTUM CORPORATION 224 AIRPORT PARKWAY, SUITE 550 SAN JOSE CA 95110 1 0 0 0 Common Stock 2017-03-02 4 A 0 30000 0.00 A 295392 I Pelican Bay Holdings, LLC Common Stock 586500 D Restricted Stock Units will fully vest on March 31, 2017. The Restricted Stock Units were granted to Pelican Bay Holdings, LLC. Mr. Powers is the sole member of Pelican Bay Holdings, LLC. In addition, Mr. Powers, the CEO and Portfolio Manager of Private Capital Management, LLC ("PCM"), holds shared voting and dispositive power with respect to 13,311,187 shares held in PCM managed accounts. Mr. Powers disclaims beneficial ownership for these shares, and PCM and Mr. Powers disclaim the existence of a group with respect to any third party. /s/ Astrid Becker-Celik, Attorney in Fact for Gregg J. Powers 2017-03-06