KOS

SEC source: 0000899243-19-005473 · doc4.xml · nonDerivative · entry 5

BCP IV GP L.L.C. · CIK 0001516552 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV LP · CIK 0001273169 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV- A LP · CIK 0001273170 · 10% owner

BLACKSTONE FAMILY INVESTMENT PARTNERSHIP CAYMAN IV-A LP · CIK 0001273171 · 10% owner

Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. · CIK 0001516550 · 10% owner

Blackstone Participation Partnership (Cayman) IV L.P. · CIK 0001344486 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 74,078

F5 · ownership.nature: 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").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005473 · doc4.xml · nonDerivative · entry 4

BCP IV GP L.L.C. · CIK 0001516552 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV LP · CIK 0001273169 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV- A LP · CIK 0001273170 · 10% owner

BLACKSTONE FAMILY INVESTMENT PARTNERSHIP CAYMAN IV-A LP · CIK 0001273171 · 10% owner

Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. · CIK 0001516550 · 10% owner

Blackstone Participation Partnership (Cayman) IV L.P. · CIK 0001344486 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 545,566

F4 · ownership.nature: These Common Shares are held by Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. ("BFIP SMD").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005473 · doc4.xml · nonDerivative · entry 3

BCP IV GP L.L.C. · CIK 0001516552 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV LP · CIK 0001273169 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV- A LP · CIK 0001273170 · 10% owner

BLACKSTONE FAMILY INVESTMENT PARTNERSHIP CAYMAN IV-A LP · CIK 0001273171 · 10% owner

Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. · CIK 0001516550 · 10% owner

Blackstone Participation Partnership (Cayman) IV L.P. · CIK 0001344486 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 657,075

F3 · ownership.nature: These Common Shares are held by Blackstone Family Investment Partnership (Cayman) IV-A L.P. ("BFIP").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005473 · doc4.xml · nonDerivative · entry 2

BCP IV GP L.L.C. · CIK 0001516552 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV LP · CIK 0001273169 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV- A LP · CIK 0001273170 · 10% owner

BLACKSTONE FAMILY INVESTMENT PARTNERSHIP CAYMAN IV-A LP · CIK 0001273171 · 10% owner

Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. · CIK 0001516550 · 10% owner

Blackstone Participation Partnership (Cayman) IV L.P. · CIK 0001344486 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 416,888

F2 · ownership.nature: These Common Shares are held by Blackstone Capital Partners (Cayman) IV-A L.P. ("BCP Cayman IV-A").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005473 · doc4.xml · nonDerivative · entry 1

BCP IV GP L.L.C. · CIK 0001516552 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV LP · CIK 0001273169 · 10% owner

BLACKSTONE CAPITAL PARTNERS CAYMAN IV- A LP · CIK 0001273170 · 10% owner

BLACKSTONE FAMILY INVESTMENT PARTNERSHIP CAYMAN IV-A LP · CIK 0001273171 · 10% owner

Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. · CIK 0001516550 · 10% owner

Blackstone Participation Partnership (Cayman) IV L.P. · CIK 0001344486 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 25,563,334

F1 · ownership.nature: 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").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005475 · doc4.xml · nonDerivative · entry 5

Blackstone Holdings III L.P. · CIK 0001404073 · 10% owner

BLACKSTONE MANAGEMENT ASSOCIATES CAYMAN IV LP · CIK 0001273623 · 10% owner

BLACKSTONE FAMILY GP LLC · CIK 0001404964 · 10% owner

Blackstone Holdings III GP L.P. · CIK 0001478809 · 10% owner

Blackstone Holdings III GP Management L.L.C. · CIK 0001478815 · 10% owner

Blackstone Group L.P. · CIK 0001393818 · 10% owner

Blackstone Group Management L.L.C. · CIK 0001404071 · 10% owner

SCHWARZMAN STEPHEN A · CIK 0001070844 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 74,078

F5 · ownership.nature: 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").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005475 · doc4.xml · nonDerivative · entry 4

Blackstone Holdings III L.P. · CIK 0001404073 · 10% owner

BLACKSTONE MANAGEMENT ASSOCIATES CAYMAN IV LP · CIK 0001273623 · 10% owner

BLACKSTONE FAMILY GP LLC · CIK 0001404964 · 10% owner

Blackstone Holdings III GP L.P. · CIK 0001478809 · 10% owner

Blackstone Holdings III GP Management L.L.C. · CIK 0001478815 · 10% owner

Blackstone Group L.P. · CIK 0001393818 · 10% owner

Blackstone Group Management L.L.C. · CIK 0001404071 · 10% owner

SCHWARZMAN STEPHEN A · CIK 0001070844 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 545,566

F4 · ownership.nature: These Common Shares are held by Blackstone Family Investment Partnership (Cayman) IV-A SMD L.P. ("BFIP SMD").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005475 · doc4.xml · nonDerivative · entry 3

Blackstone Holdings III L.P. · CIK 0001404073 · 10% owner

BLACKSTONE MANAGEMENT ASSOCIATES CAYMAN IV LP · CIK 0001273623 · 10% owner

BLACKSTONE FAMILY GP LLC · CIK 0001404964 · 10% owner

Blackstone Holdings III GP L.P. · CIK 0001478809 · 10% owner

Blackstone Holdings III GP Management L.L.C. · CIK 0001478815 · 10% owner

Blackstone Group L.P. · CIK 0001393818 · 10% owner

Blackstone Group Management L.L.C. · CIK 0001404071 · 10% owner

SCHWARZMAN STEPHEN A · CIK 0001070844 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 657,075

F3 · ownership.nature: These Common Shares are held by Blackstone Family Investment Partnership (Cayman) IV-A L.P. ("BFIP").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005475 · doc4.xml · nonDerivative · entry 2

Blackstone Holdings III L.P. · CIK 0001404073 · 10% owner

BLACKSTONE MANAGEMENT ASSOCIATES CAYMAN IV LP · CIK 0001273623 · 10% owner

BLACKSTONE FAMILY GP LLC · CIK 0001404964 · 10% owner

Blackstone Holdings III GP L.P. · CIK 0001478809 · 10% owner

Blackstone Holdings III GP Management L.L.C. · CIK 0001478815 · 10% owner

Blackstone Group L.P. · CIK 0001393818 · 10% owner

Blackstone Group Management L.L.C. · CIK 0001404071 · 10% owner

SCHWARZMAN STEPHEN A · CIK 0001070844 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 416,888

F2 · ownership.nature: These Common Shares are held by Blackstone Capital Partners (Cayman) IV-A L.P. ("BCP Cayman IV-A").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0000899243-19-005475 · doc4.xml · nonDerivative · entry 1

Blackstone Holdings III L.P. · CIK 0001404073 · 10% owner

BLACKSTONE MANAGEMENT ASSOCIATES CAYMAN IV LP · CIK 0001273623 · 10% owner

BLACKSTONE FAMILY GP LLC · CIK 0001404964 · 10% owner

Blackstone Holdings III GP L.P. · CIK 0001478809 · 10% owner

Blackstone Holdings III GP Management L.L.C. · CIK 0001478815 · 10% owner

Blackstone Group L.P. · CIK 0001393818 · 10% owner

Blackstone Group Management L.L.C. · CIK 0001404071 · 10% owner

SCHWARZMAN STEPHEN A · CIK 0001070844 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 25,563,334

F1 · ownership.nature: 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").

F6 · ownership.nature: 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.

F7 · ownership.nature: Due to the limitations of the electronic filing system certain Reporting Persons are filing a separate Form 4.

F8 · ownership.nature: 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.

F9 · ownership.nature: 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.

SEC source: 0001509991-19-000042 · wf-form4_154932047916385.xml · nonDerivative · entry 1

CHAMBERS THOMAS P · CIK 0001240205 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 613,171

F1 · shares: These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest with respect to one-third of the total number of shares on January 31 of each of 2020, 2021 and 2022, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-19-000052 · wf-form4_154932147783450.xml · nonDerivative · entry 1

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 447,633

F1 · shares: These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest with respect to one-third of the total number of shares on January 31 of each of 2020, 2021 and 2022, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-19-000050 · wf-form4_154932128513886.xml · nonDerivative · entry 1

INGLIS ANDREW G · CIK 0001600834 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,582,927

F1 · shares: These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest with respect to one-third of the total number of shares on January 31 of each of 2020, 2021 and 2022, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-19-000046 · wf-form4_154932087999591.xml · nonDerivative · entry 1

Doughty Jason · CIK 0001561919 · SVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 791,256

F1 · shares: These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest with respect to one-third of the total number of shares on January 31 of each of 2020, 2021 and 2022, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-19-000048 · wf-form4_154932110075918.xml · nonDerivative · entry 1

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 465,960

F1 · shares: These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest with respect to one-third of the total number of shares on January 31 of each of 2020, 2021 and 2022, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-19-000044 · wf-form4_154932064409722.xml · nonDerivative · entry 1

Clark Richard Ryan · CIK 0001754167 · SVP, President Gulf of Mexico

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,125

F1 · shares: These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest with respect to one-third of the total number of shares on January 31 of each of 2020, 2021 and 2022, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-19-000040 · wf-form4_154932030987859.xml · nonDerivative · entry 1

Ball Christopher James · CIK 0001585399 · SVP, Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 793,578

F1 · shares: These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest with respect to one-third of the total number of shares on January 31 of each of 2020, 2021 and 2022, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-19-000016 · wf-form4_154699068662346.xml · nonDerivative · entry 2

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 407,633

F2 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Plan.

SEC source: 0001509991-19-000016 · wf-form4_154699068662346.xml · nonDerivative · entry 1

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 420,660

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on January 22, 2016 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000028 · wf-form4_154699587879884.xml · nonDerivative · entry 2

MAXTED BRIAN F · CIK 0001240698 · Director · Chief Exploration Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,869,569

F2 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Plan.

SEC source: 0001509991-19-000028 · wf-form4_154699587879884.xml · nonDerivative · entry 1

MAXTED BRIAN F · CIK 0001240698 · Director · Chief Exploration Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,906,228

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on January 22, 2016 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000026 · wf-form4_154699180770449.xml · nonDerivative · entry 2

CHAMBERS THOMAS P · CIK 0001240205 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 540,046

F2 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Plan.

SEC source: 0001509991-19-000026 · wf-form4_154699180770449.xml · nonDerivative · entry 1

CHAMBERS THOMAS P · CIK 0001240205 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 563,987

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on January 22, 2016 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000024 · wf-form4_154699135992661.xml · nonDerivative · entry 2

Ball Christopher James · CIK 0001585399 · SVP, Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 720,453

F2 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Plan.

SEC source: 0001509991-19-000024 · wf-form4_154699135992661.xml · nonDerivative · entry 1

Ball Christopher James · CIK 0001585399 · SVP, Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 741,527

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on January 22, 2016 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000022 · wf-form4_154699120024960.xml · nonDerivative · entry 2

INGLIS ANDREW G · CIK 0001600834 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,459,102

F2 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Plan.

SEC source: 0001509991-19-000022 · wf-form4_154699120024960.xml · nonDerivative · entry 1

INGLIS ANDREW G · CIK 0001600834 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,499,862

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on January 22, 2016 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000020 · wf-form4_154699102261744.xml · nonDerivative · entry 2

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 429,529

F2 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Plan.

SEC source: 0001509991-19-000020 · wf-form4_154699102261744.xml · nonDerivative · entry 1

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 446,566

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on January 22,2016 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000018 · wf-form4_154699087408056.xml · nonDerivative · entry 2

Doughty Jason · CIK 0001561919 · SVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 739,104

F2 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Plan.

SEC source: 0001509991-19-000018 · wf-form4_154699087408056.xml · nonDerivative · entry 1

Doughty Jason · CIK 0001561919 · SVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 757,626

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on January 22, 2016 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000034 · wf-form4a_154784839757567.xml · nonDerivative · entry 2

MAXTED BRIAN F · CIK 0001240698 · Director · Chief Exploration Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,666,711

F1 · balance_after: These amounts reflect an exempt transfer of 563,340 shares previously made by the reporting person to Maxted Ventures LLC.

SEC source: 0001509991-19-000034 · wf-form4a_154784839757567.xml · nonDerivative · entry 1

MAXTED BRIAN F · CIK 0001240698 · Director · Chief Exploration Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,703,370

F1 · balance_after: These amounts reflect an exempt transfer of 563,340 shares previously made by the reporting person to Maxted Ventures LLC.

SEC source: 0001509991-19-000036 · wf-form4a_154784875887985.xml · nonDerivative · entry 1

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 421,884

F1 · shares: Due to an administrative error, the original Form 4 timely filed on January 8, 2019 reporting the number of shares withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan were stated as 17,037, and the correct amount is 18,439.

SEC source: 0001509991-19-000010 · wf-form4_154664264289707.xml · nonDerivative · entry 1

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 387,380

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan.

SEC source: 0001509991-19-000014 · wf-form4_154664302908294.xml · nonDerivative · entry 1

MAXTED BRIAN F · CIK 0001240698 · Director · Chief Exploration Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,197,844

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan.

SEC source: 0001509991-19-000012 · wf-form4_154664279244357.xml · nonDerivative · entry 3

CHAMBERS THOMAS P · CIK 0001240205 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 503,147

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan (the "Plan").

SEC source: 0001509991-19-000012 · wf-form4_154664279244357.xml · nonDerivative · entry 2

CHAMBERS THOMAS P · CIK 0001240205 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 556,534

F2 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on December 1, 2014 under the Plan that vested based on the level of achievement of the applicable performance condition.

SEC source: 0001509991-19-000012 · wf-form4_154664279244357.xml · nonDerivative · entry 1

CHAMBERS THOMAS P · CIK 0001240205 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 424,835

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan (the "Plan").

SEC source: 0001509991-19-000008 · wf-form4_154664247760237.xml · nonDerivative · entry 1

Doughty Jason · CIK 0001561919 · SVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 710,555

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan.

SEC source: 0001509991-19-000006 · wf-form4_154664228859726.xml · nonDerivative · entry 1

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 403,270

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan.

SEC source: 0001509991-19-000004 · wf-form4_154664212266132.xml · nonDerivative · entry 1

INGLIS ANDREW G · CIK 0001600834 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,396,278

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan.

SEC source: 0001509991-19-000002 · wf-form4_154664191601828.xml · nonDerivative · entry 1

Ball Christopher James · CIK 0001585399 · SVP, Chief Commercial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 687,971

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan.

SEC source: 0001509991-19-000030 · wf-form4a_154784751810479.xml · nonDerivative · entry 1

MAXTED BRIAN F · CIK 0001240698 · Director · Chief Exploration Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,192,246

F1 · shares: Due to an administrative error, the original Form 4 timely filed on January 4, 2019 reporting the number of shares withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan were stated as 36,781, and the correct amount is 42,379.

SEC source: 0001509991-19-000032 · wf-form4a_154784774266999.xml · nonDerivative · entry 1

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 397,027

F1 · shares: Due to an administrative error, the original Form 4 timely filed on January 4, 2019 reporting the number of shares withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan were stated as 14,234, and the correct amount is 20,477.

SEC source: 0000950103-18-014457 · dp99414_4-chambers.xml · nonDerivative · entry 1

CHAMBERS THOMAS P · CIK 0001240205 · SVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 453,611

F1 · shares: These shares were withheld by the Issuer to satisfy the tax withholding requirement arising from the vesting of restricted share units granted to the reporting person under the Issuer's Long Term Incentive Plan.

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 8

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

Warburg Pincus Private Equity VIII, L.P. · CIK 0001157334 · Director · 10% owner

Warburg Pincus International Partners, L.P. · CIK 0001299643 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · Director · 10% owner

Landy Joseph P. · CIK 0001220638 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 33,574,222

F2 · price: This amount represents the per share price of Common Shares sold to the Issuer pursuant to the Share Repurchase Agreement dated November 26, 2018 (the "Share Repurchase Agreement").

F8 · ownership.nature: Joseph P. Landy is a Managing General Partner of WP and a Managing Member and Co-Chief Executive Officer of WP LLC. Pursuant to Rule 16a-1 of the Exchange Act, Mr. Landy may be deemed to be the beneficial owner of any securities reported herein that may be deemed to be beneficially owned by the WP VIII Funds and the WPIP Funds.

F9 · ownership.nature: Pursuant to Rule 16a-1(a)(4) of the Exchange Act, each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy herein state that this filing shall not be deemed an admission that he or it is the beneficial owner of any such Common Shares covered herein. Each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy disclaims beneficial ownership of such Common Shares, except to the extent of its or his pecuniary interest in such Common Shares. This Form 4 shall not be deemed an admission that any reporting person or any other person referred to herein is a beneficial owner of any securities of the Issuer for purposes of Section 16 of the Exchange Act, or for any other purpose or that any reporting person or other person has an obligation to file this Form 4.

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 7

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

Warburg Pincus Private Equity VIII, L.P. · CIK 0001157334 · Director · 10% owner

Warburg Pincus International Partners, L.P. · CIK 0001299643 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · Director · 10% owner

Landy Joseph P. · CIK 0001220638 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 33,574,222

F2 · price: This amount represents the per share price of Common Shares sold to the Issuer pursuant to the Share Repurchase Agreement dated November 26, 2018 (the "Share Repurchase Agreement").

F5 · ownership.nature: Reflects the aggregate number of Common Shares directly owned by the WP VIII Funds and the WPIP Funds.

F6 · ownership.nature: WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP VIII Investors GP"), is the general partner of WP VIII Investors. WP-WPIP Investors GP L.P., a Delaware limited partnership ("WPIP Investors GP"), is the general partner of WPIP Investors. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of each of WP VIII Investors GP and WPIP Investors GP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII, WP VIII Netherlands, WPIP, and WPIP Netherlands. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners. Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. The WP VIII Funds and WPIP Funds are managed by Warburg Pincus LLC, a New York limited liability company ("WP LLC").

F7 · ownership.nature: Charles R. Kaye is a Managing General Partner of WP and a Managing Member and Co-Chief Executive Officer of WP LLC. Pursuant to Rule 16a-1 of the Securities and Exchange Act of 1934, as amended (the "Exchange Act"), WP Partners, WP Partners GP, WP, WP LLC and Mr. Kaye may be deemed to be the beneficial owners of any securities reported herein that may be deemed to be beneficially owned by the WP VIII Funds and the WPIP Funds.

F9 · ownership.nature: Pursuant to Rule 16a-1(a)(4) of the Exchange Act, each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy herein state that this filing shall not be deemed an admission that he or it is the beneficial owner of any such Common Shares covered herein. Each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy disclaims beneficial ownership of such Common Shares, except to the extent of its or his pecuniary interest in such Common Shares. This Form 4 shall not be deemed an admission that any reporting person or any other person referred to herein is a beneficial owner of any securities of the Issuer for purposes of Section 16 of the Exchange Act, or for any other purpose or that any reporting person or other person has an obligation to file this Form 4.

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 6

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

Warburg Pincus Private Equity VIII, L.P. · CIK 0001157334 · Director · 10% owner

Warburg Pincus International Partners, L.P. · CIK 0001299643 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · Director · 10% owner

Landy Joseph P. · CIK 0001220638 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 68,574,222

F1 · price: This amount represents the per share price of common shares (the "Common Shares") of Kosmos Energy Ltd. (the "Issuer") sold by the underwriters in connection with a secondary offering of the Issuer pursuant to an Underwriting Agreement dated November 26, 2018 (the "Offering"). The material terms of the Offering are described in the prospectus supplement, dated November 26, 2018, filed by the Issuer with the Securities and Exchange Commission (the "SEC") on November 28, 2018.

F8 · ownership.nature: Joseph P. Landy is a Managing General Partner of WP and a Managing Member and Co-Chief Executive Officer of WP LLC. Pursuant to Rule 16a-1 of the Exchange Act, Mr. Landy may be deemed to be the beneficial owner of any securities reported herein that may be deemed to be beneficially owned by the WP VIII Funds and the WPIP Funds.

F9 · ownership.nature: Pursuant to Rule 16a-1(a)(4) of the Exchange Act, each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy herein state that this filing shall not be deemed an admission that he or it is the beneficial owner of any such Common Shares covered herein. Each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy disclaims beneficial ownership of such Common Shares, except to the extent of its or his pecuniary interest in such Common Shares. This Form 4 shall not be deemed an admission that any reporting person or any other person referred to herein is a beneficial owner of any securities of the Issuer for purposes of Section 16 of the Exchange Act, or for any other purpose or that any reporting person or other person has an obligation to file this Form 4.

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 5

WARBURG PINCUS & CO. · CIK 0000929408 · Director · 10% owner

WARBURG PINCUS LLC · CIK 0001162870 · Director · 10% owner

Warburg Pincus Partners, L.P. · CIK 0001621242 · Director · 10% owner

Warburg Pincus Partners GP LLC · CIK 0001621224 · Director · 10% owner

Warburg Pincus Private Equity VIII, L.P. · CIK 0001157334 · Director · 10% owner

Warburg Pincus International Partners, L.P. · CIK 0001299643 · Director · 10% owner

KAYE CHARLES R · CIK 0001239318 · Director · 10% owner

Landy Joseph P. · CIK 0001220638 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 68,574,222

F1 · price: This amount represents the per share price of common shares (the "Common Shares") of Kosmos Energy Ltd. (the "Issuer") sold by the underwriters in connection with a secondary offering of the Issuer pursuant to an Underwriting Agreement dated November 26, 2018 (the "Offering"). The material terms of the Offering are described in the prospectus supplement, dated November 26, 2018, filed by the Issuer with the Securities and Exchange Commission (the "SEC") on November 28, 2018.

F5 · ownership.nature: Reflects the aggregate number of Common Shares directly owned by the WP VIII Funds and the WPIP Funds.

F6 · ownership.nature: WP-WPVIII Investors GP L.P., a Delaware limited partnership ("WP VIII Investors GP"), is the general partner of WP VIII Investors. WP-WPIP Investors GP L.P., a Delaware limited partnership ("WPIP Investors GP"), is the general partner of WPIP Investors. WPP GP LLC, a Delaware limited liability company ("WPP GP"), is the general partner of each of WP VIII Investors GP and WPIP Investors GP. Warburg Pincus Partners, L.P., a Delaware limited partnership ("WP Partners"), is (i) the managing member of WPP GP, and (ii) the general partner of WP VIII, WP VIII Netherlands, WPIP, and WPIP Netherlands. Warburg Pincus Partners GP LLC, a Delaware limited liability company ("WP Partners GP"), is the general partner of WP Partners. Warburg Pincus & Co., a New York general partnership ("WP"), is the managing member of WP Partners GP. The WP VIII Funds and WPIP Funds are managed by Warburg Pincus LLC, a New York limited liability company ("WP LLC").

F7 · ownership.nature: Charles R. Kaye is a Managing General Partner of WP and a Managing Member and Co-Chief Executive Officer of WP LLC. Pursuant to Rule 16a-1 of the Securities and Exchange Act of 1934, as amended (the "Exchange Act"), WP Partners, WP Partners GP, WP, WP LLC and Mr. Kaye may be deemed to be the beneficial owners of any securities reported herein that may be deemed to be beneficially owned by the WP VIII Funds and the WPIP Funds.

F9 · ownership.nature: Pursuant to Rule 16a-1(a)(4) of the Exchange Act, each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy herein state that this filing shall not be deemed an admission that he or it is the beneficial owner of any such Common Shares covered herein. Each of WP VIII, WPIP, WP Partners, WP Partners GP, WP, WP LLC, Mr. Kaye and Mr. Landy disclaims beneficial ownership of such Common Shares, except to the extent of its or his pecuniary interest in such Common Shares. This Form 4 shall not be deemed an admission that any reporting person or any other person referred to herein is a beneficial owner of any securities of the Issuer for purposes of Section 16 of the Exchange Act, or for any other purpose or that any reporting person or other person has an obligation to file this Form 4.