X0303 4 2009-05-11 0 0001022345 MARINER ENERGY INC ME 0001162242 GINNS JONATHAN J ACON INVESTMENTS LLC 1133 CONNECTICUT AVENUE, NW, SUITE 700 WASHINGTON DC 20036 1 0 0 0 Common Stock 2009-05-11 4 A 0 11169 A 30372 D Common Stock 184044 I See Footnote Shares of restricted stock granted on May 11, 2009 under the issuer's Stock Incentive Plan, as amended and restated from time to time. The shares vest one-third on each of the next three regularly-scheduled annual meetings of the issuer's stockholders following the date of grant. The number of shares granted was determined by reference to the closing price per share of the issuer's common stock on the New York Stock Exchange on May 8, 2009 of $13.43. Represents shares held by ACON E&P, LLC ("LLC"). The reporting person is a managing member of LLC. The reporting person disclaims beneficial ownership of the securities held by LLC except to the extent of his pecuniary interest therein. Jonathan J. Ginns by Teresa G. Bushman pursuant to Power of Attorney dated March 1, 2006 (previously filed as Exhibit 24 to Mr. Ginns' Form 4/A filed on April 4, 2006). 2009-05-11