X0303 4 2010-05-19 0001471261 Cobalt International Energy, Inc. CIE 0001295907 Bryant Joseph H C/O TWO POST OAK CENTRAL 1980 POST OAK BOULEVARD, SUITE 1200 HOUSTON TX 77056 1 1 0 0 Chairman of the Board and CEO Common Stock 2010-05-19 4 P 0 15000 8.93 A 4848387 D Common Stock 506152 I See footnote This purchase price is a weighted average purchase price that represents the purchase of these shares of Common Stock at prices ranging from $8.88 to $8.95. The reporting person undertakes to provide upon request by the SEC staff, the Issuer or any security holder of the Issuer, full information regarding the number of shares of Common Stock sold at each separate price. These shares of Common Stock are directly owned by the Bryant 2007 Descendants' Trust for the benefit of the reporting person's minor children. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. /s/ Jeffrey A. Starzec, Attorney-in-Fact 2010-05-19