X0306 4 2018-09-19 0 0001509991 Kosmos Energy Ltd. KOS 0001516552 BCP IV GP L.L.C. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001273169 BLACKSTONE CAPITAL PARTNERS CAYMAN IV LP C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001273170 BLACKSTONE CAPITAL PARTNERS CAYMAN IV- A LP C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001273171 BLACKSTONE FAMILY INVESTMENT PARTNERSHIP CAYMAN IV-A LP C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001516550 Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 0001344486 Blackstone Participation Partnership (Cayman) IV L.P. C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 0 0 1 0 Common Shares 2018-09-19 4 S 0 3090802 8.94 D 46665299 I See Footnotes Common Shares 2018-09-19 4 S 0 50405 8.94 D 761020 I See Footnotes Common Shares 2018-09-19 4 S 0 79445 8.94 D 1199476 I See Footnotes Common Shares 2018-09-19 4 S 0 65963 8.94 D 995919 I See Footnotes Common Shares 2018-09-19 4 S 0 8956 8.94 D 135227 I See Footnotes These common shares, par value $0.01 per share (the "Common Shares"), of Kosmos Energy Ltd. (the "Issuer") are held by Blackstone Capital Partners (Cayman) IV L.P. ("BCP Cayman IV"). These Common Shares are held by Blackstone Capital Partners (Cayman) IV-A L.P. ("BCP Cayman IV-A"). These Common Shares are held by Blackstone Family Investment Partnership (Cayman) IV-A L.P. ("BFIP"). These Common Shares are held by Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. ("BFIP SMD"). These Common Shares are held by Blackstone Participation Partnership (Cayman) IV L.P. ("BPP", together with BCP Cayman IV, BCP Cayman IV-A, BFIP and BFIP SMD, the "Blackstone Funds"). The general partner of BFIP SMD is Blackstone Family GP L.L.C., which is wholly owned by Blackstone's senior managing directors and controlled by Mr. Stephen A. Schwarzman, its founder. The general partner of BCP Cayman IV and BCP Cayman IV-A is Blackstone Management Associates (Cayman) IV L.P. ("BMA"). A general partner of BMA, BFIP, and BPP is BCP IV GP L.L.C ("BCP IV"). Blackstone Holdings III L.P. is the sole member of BCP IV. The general partner of Blackstone Holdings III L.P. is Blackstone Holdings III GP L.P. The general partner of Blackstone Holdings III GP L.P. is Blackstone Holdings III GP Management L.L.C. The sole member of Blackstone Holdings III GP Management L.L.C. is The Blackstone Group L.P. The general partner of The Blackstone Group L.P. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly owned by Blackstone's senior managing directors and controlled by its founder, Stephen A. Schwarzman. Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4. Information with respect to each of the Reporting Persons is given solely by such Reporting Person, and no Reporting Person has responsibility for the accuracy or completeness of information supplied by another Reporting Person. Each of the Reporting Persons (other than each of the Blackstone Funds to the extent they directly hold securities reported herein), disclaims beneficial ownership of the securities held by the Blackstone Funds, except to the extent of such Reporting Person's pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than each of the Blackstone Funds to the extent they directly hold securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose. BCP IV GP L.L.C., By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2018-09-21 BLACKSTONE CAPITAL PARTNERS (CAYMAN) IV L.P., By: Blackstone Management Associates (Cayman) IV L.P., its general partner, By: BCP IV GP L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2018-09-21 BLACKSTONE CAPITAL PARTNERS (CAYMAN) IV-A L.P., By: Blackstone Management Associates (Cayman) IV L.P., its general partner, By: BCP IV GP L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2018-09-21 BLACKSTONE FAMILY INVESTMENT PARTNERSHIP (CAYMAN) IV-A L.P., By: BCP IV GP L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2018-09-21 BLACKSTONE FAMILY INVESTMENT PARTNERSHIP (CAYMAN) IV-A SMD L.P., By: Blackstone Family GP L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2018-09-21 BLACKSTONE PARTICIPATION PARTNERSHIP (CAYMAN) IV L.P., By: BCP IV GP L.L.C., its general partner, By: /s/ John G. Finley, Name: John G. Finley, Title: Chief Legal Officer 2018-09-21