X0304 4 2012-02-29 0 0001471261 Cobalt International Energy, Inc. CIE 0001478434 KERN Cobalt Co-Invest Partners AP LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478635 KERN Cobalt Group Management Ltd. CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478432 KERN Energy Partners I LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478431 KERN Energy Partners II LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478430 KERN Energy Partners III LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478537 KERN Cobalt Co-Invest V LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478429 KERN Energy Partners I U.S. LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478428 KERN Energy Partners II U.S. LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478427 KERN Energy Partners III U.S. LP CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 0001478456 KERN Cobalt Group V LLC CENTENNIAL PLACE EAST, 3110-520 3RD AVENUE SW CALGARY A0 T2P 0R3 ALBERTA, CANADA 0 0 1 0 Common Stock, par value $0.01 2012-02-29 4 S 0 5095298 27.16 D 26939795 D For text of Footnote 1, see Exhibit 99.1. For text of Footnote 2, see Exhibit 99.1. For text of Footnote 3, see Exhibit 99.1. See Exhibit 99.2 2012-03-02