X0303 4 2011-05-16 0001509991 Kosmos Energy Ltd. KOS 0001517321 Dailly Paul A C/O KOSMOS ENERGY, LLC 8176 PARK LANE, SUITE 500 DALLAS TX 75231 0 1 0 0 Senior V.P, Exploration Common Shares 2011-05-16 4 J 0 4418011 0 A 4418011 D Common Shares 2011-05-16 4 J 0 1514666 0 A 1514666 I See Footnote Common Shares 2011-05-18 4 A 0 1552941 0 A 5970952 D Common Shares (Right to Receive) 2011-05-18 4 A 0 388235 0 A Common Shares 388235 388235 D In connection with a corporate reorganization, which involved Kosmos Energy Holdings becoming wholly-owned by the Issuer, and the Issuer's initial public offering described in the prospectus dated May 11, 2011, the reporting person received 3,912,758 common shares in exchange for his vested units in Kosmos Energy Holdings, the Issuer's predecessor, and 505,253 restricted shares in exchange for his unvested profit units in Kosmos Energy Holdings under the Issuer's Long Term Incentive Plan (the "Plan"). Subject to the terms of the Plan and an award agreement under the Plan, these restricted shares are scheduled to vest on the same dates as the exchanged profit units were scheduled to vest, as follows: 82,413 of these restricted shares are scheduled to vest on June 13, 2011, and 422,840 of these restricted shares are scheduled to vest 50% on June 11, 2011 and 50% on June 11, 2012. These shares granted under the Plan are directly owned by Dailly-Simmie Ventures, Ltd., an entity controlled by the reporting person. In connection with the Issuer's corporate reorganization and initial public offering, Dailly-Simmie Ventures, Ltd. received 929,420 common shares in exchange for its vested units in Kosmos Energy Holdings and 585,246 restricted shares in exchange for its unvested profit units under the Plan. Subject to the terms of the Plan and an award agreement under the Plan, these restricted shares are scheduled to vest on the same dates as the exchanged profit units were scheduled to vest, as follows: 20,599 of these restricted shares are scheduled to vest on June 13, 2011, and 564,647 of these restricted shares are scheduled to vest 50% on June 11, 2011 and 50% on June 11, 2012. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. These restricted shares were granted under the Plan and are scheduled to vest 25% on each of the first four anniversaries of May 16, 2011, subject to the terms of the Plan and an award agreement under the Plan. 1 for 1. In connection with the Issuer's initial public offering, the reporting person acquired a contractual right to receive restricted shares under the Plan within 30 days after the offering. These restricted shares are scheduled to vest 25% on each of the first four anniversaries of May 16, 2011 based on the satisfaction of certain performance conditions, in accordance with the terms of the Plan and an award agreement to be issued under the Plan. /s/ Phillip Feiner, as Attorney-in-Fact 2011-05-18