KOS

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 4

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: Direct

Disclosed balance after: 16,090,787

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").

F4 · ownership.direct: Reflects the number of Common Shares directly owned by Warburg Pincus International Partners, L.P., a Delaware limited partnership ("WPIP"). This number does not include the number of Common Shares held by Warburg Pincus Netherlands International Partners I C.V., a company incorporated under the laws of the Netherlands ("WPIP Netherlands"), and WP-WPIP Investors L.P., a Delaware limited partnership ("WPIP Investors"), which are limited partnerships affiliated with WPIP (WPIP Netherlands and WPIP Investors, together with WPIP, the "WPIP Funds"). WPIP Netherlands and WPIP Investors sold 345,000 Common Shares and 12,765 Common Shares, respectively, in connection with the Offering, and 700,000 Common Shares and 25,900 Common Shares, respectively, pursuant to the Share Repurchase Agreement, subsequent to which they own 671,488 Common Shares and 24,841 Common Shares, respectively.

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 3

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: Direct

Disclosed balance after: 16,268,318

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").

F3 · ownership.direct: Reflects the number of Common Shares directly owned by Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"). This number does not include the number of Common Shares held by Warburg Pincus Netherlands Private Equity VIII C.V. I, a company incorporated under the laws of the Netherlands ("WP VIII Netherlands") and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP VIII Investors"), which are limited partnerships affiliated with WP VIII (WP VIII Netherlands and WP VIII Investors, together with WP VIII, the "WP VIII Funds"). WP VIII Netherlands and WP VIII Investors sold 242,275 Common Shares and 24,227 Common Shares, respectively, in connection with the Offering, and 491,573 Common Shares and 49,157 Common Shares, respectively, pursuant to the Share Repurchase Agreement, subsequent to which they own 472,018 Common Shares and 46,770 Common Shares, respectively.

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 2

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: Direct

Disclosed balance after: 32,864,887

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.

F4 · ownership.direct: Reflects the number of Common Shares directly owned by Warburg Pincus International Partners, L.P., a Delaware limited partnership ("WPIP"). This number does not include the number of Common Shares held by Warburg Pincus Netherlands International Partners I C.V., a company incorporated under the laws of the Netherlands ("WPIP Netherlands"), and WP-WPIP Investors L.P., a Delaware limited partnership ("WPIP Investors"), which are limited partnerships affiliated with WPIP (WPIP Netherlands and WPIP Investors, together with WPIP, the "WPIP Funds"). WPIP Netherlands and WPIP Investors sold 345,000 Common Shares and 12,765 Common Shares, respectively, in connection with the Offering, and 700,000 Common Shares and 25,900 Common Shares, respectively, pursuant to the Share Repurchase Agreement, subsequent to which they own 671,488 Common Shares and 24,841 Common Shares, respectively.

SEC source: 0001104659-18-070333 · a4.xml · nonDerivative · entry 1

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: Direct

Disclosed balance after: 33,227,588

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.

F3 · ownership.direct: Reflects the number of Common Shares directly owned by Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"). This number does not include the number of Common Shares held by Warburg Pincus Netherlands Private Equity VIII C.V. I, a company incorporated under the laws of the Netherlands ("WP VIII Netherlands") and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP VIII Investors"), which are limited partnerships affiliated with WP VIII (WP VIII Netherlands and WP VIII Investors, together with WP VIII, the "WP VIII Funds"). WP VIII Netherlands and WP VIII Investors sold 242,275 Common Shares and 24,227 Common Shares, respectively, in connection with the Offering, and 491,573 Common Shares and 49,157 Common Shares, respectively, pursuant to the Share Repurchase Agreement, subsequent to which they own 472,018 Common Shares and 46,770 Common Shares, respectively.

SEC source: 0001104659-18-070332 · a4.xml · nonDerivative · entry 2

Krieger David Benjamin · CIK 0001387043 · Director

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.

F3 · ownership.nature: Reflects the aggregate number of Common Shares directly owned by Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), together with two affiliated limited partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a company incorporated under the laws of the Netherlands ("WP VIII Netherlands"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP VIII Investors", and together with WP VIII Netherlands and WP VIII, the "WP VIII Funds"), and Warburg Pincus International Partners, L.P., a Delaware limited partnership ("WPIP"), together with two affiliated limited partnerships, Warburg Pincus Netherlands International Partners I C.V., a company incorporated under the laws of the Netherlands ("WPIP Netherlands") and WP-WPIP Investors L.P., a Delaware limited partnership ("WPIP Investors", and together with WPIP Netherlands and WPIP, the "WPIP Funds").

F4 · 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 the WPIP Funds are managed by Warburg Pincus LLC, a New York limited liability company ("WP LLC").

F5 · ownership.nature: Mr. Krieger is a Partner of WP and a Managing Director and Member of WP LLC. By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as a Partner of WP and a Managing Director and Member of WP LLC, Mr. Krieger may be deemed to be the beneficial owner of the Common Shares reported on this Form 4. Pursuant to Rule 16a-1(a)(4) under the Exchange Act, Mr. Krieger herein states that this filing shall not be deemed an admission that he is the beneficial owner of any of the Common Shares covered hereby. Mr. Krieger disclaims beneficial ownership of the Common Shares reported on this Form 4, except to the extent of his pecuniary interest in such Common Shares.

SEC source: 0001104659-18-070332 · a4.xml · nonDerivative · entry 1

Krieger David Benjamin · CIK 0001387043 · Director

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.

F3 · ownership.nature: Reflects the aggregate number of Common Shares directly owned by Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), together with two affiliated limited partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a company incorporated under the laws of the Netherlands ("WP VIII Netherlands"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP VIII Investors", and together with WP VIII Netherlands and WP VIII, the "WP VIII Funds"), and Warburg Pincus International Partners, L.P., a Delaware limited partnership ("WPIP"), together with two affiliated limited partnerships, Warburg Pincus Netherlands International Partners I C.V., a company incorporated under the laws of the Netherlands ("WPIP Netherlands") and WP-WPIP Investors L.P., a Delaware limited partnership ("WPIP Investors", and together with WPIP Netherlands and WPIP, the "WPIP Funds").

F4 · 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 the WPIP Funds are managed by Warburg Pincus LLC, a New York limited liability company ("WP LLC").

F5 · ownership.nature: Mr. Krieger is a Partner of WP and a Managing Director and Member of WP LLC. By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as a Partner of WP and a Managing Director and Member of WP LLC, Mr. Krieger may be deemed to be the beneficial owner of the Common Shares reported on this Form 4. Pursuant to Rule 16a-1(a)(4) under the Exchange Act, Mr. Krieger herein states that this filing shall not be deemed an admission that he is the beneficial owner of any of the Common Shares covered hereby. Mr. Krieger disclaims beneficial ownership of the Common Shares reported on this Form 4, except to the extent of his pecuniary interest in such Common Shares.

SEC source: 0001509991-19-000038 · wf-form5_154785061791505.xml · nonDerivative · entry 6

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,584,557

F3 · balance_after: These amounts reflect an adjustment of 1,000 shares that resulted from a prior administrative error.

F2 · ownership.nature: These shares are directly held by the reporting person's wife. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

SEC source: 0001509991-19-000038 · wf-form5_154785061791505.xml · nonDerivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,257,551

SEC source: 0001104659-18-058048 · a4.xml · nonDerivative · entry 4

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: 85,824,222

F6 · ownership.nature: Joseph P. Landy is a director of the Issuer, 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.

F7 · 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: 0001104659-18-058048 · a4.xml · nonDerivative · entry 3

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: 85,824,222

F3 · ownership.nature: Reflects the aggregate number of Common Shares directly owned by the WP VIII Funds and the WPIP Funds.

F4 · 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").

F5 · 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.

F7 · 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: 0001104659-18-058048 · a4.xml · nonDerivative · entry 2

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: Direct

Disclosed balance after: 41,132,122

F2 · ownership.direct: Reflects the number of Common Shares directly owned by Warburg Pincus International Partners, L.P., a Delaware limited partnership ("WPIP"). This number does not include the number of Common Shares held by Warburg Pincus Netherlands International Partners I C.V., a company incorporated under the laws of the Netherlands ("WPIP Netherlands"), and WP-WPIP Investors L.P., a Delaware limited partnership ("WPIP Investors"), which are limited partnerships affiliated with WPIP (WPIP Netherlands and WPIP Investors, together with WPIP, the "WPIP Funds"). WPIP Netherlands and WPIP Investors sold 113,689 Common Shares and 4,206 Common Shares, respectively, on September 19, 2018, subsequent to which they own 1,716,488 Common Shares and 63,506 Common Shares, respectively.

SEC source: 0001104659-18-058048 · a4.xml · nonDerivative · entry 1

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: Direct

Disclosed balance after: 41,586,086

F1 · ownership.direct: Reflects the number of Common Shares directly owned by Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"). This number does not include the number of Common Shares held by Warburg Pincus Netherlands Private Equity VIII C.V. I, a company incorporated under the laws of the Netherlands ("WP VIII Netherlands") and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP VIII Investors"), which are limited partnerships affiliated with WP VIII (WP VIII Netherlands and WP VIII Investors, together with WP VIII, the "WP VIII Funds"). WP VIII Netherlands and WP VIII Investors sold 79,837 Common Shares and 7,984 Common Shares, respectively, on September 19, 2018, subsequent to which they own 1,205,866 Common Shares and 120,154 Common Shares, respectively.

SEC source: 0000899243-18-025010 · 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: 135,227

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: 0000899243-18-025010 · 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: 995,919

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: 0000899243-18-025010 · 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: 1,199,476

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: 0000899243-18-025010 · 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: 761,020

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: 0000899243-18-025010 · 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: 46,665,299

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: 0001104659-18-058041 · a4.xml · nonDerivative · entry 1

Krieger David Benjamin · CIK 0001387043 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 85,824,222

F1 · ownership.nature: Reflects the aggregate number of Common Shares directly owned by Warburg Pincus Private Equity VIII, L.P., a Delaware limited partnership ("WP VIII"), together with two affiliated limited partnerships, Warburg Pincus Netherlands Private Equity VIII C.V. I, a company incorporated under the laws of the Netherlands ("WP VIII Netherlands"), and WP-WPVIII Investors, L.P., a Delaware limited partnership ("WP VIII Investors", and together with WP VIII Netherlands and WP VIII, the "WP VIII Funds"), and Warburg Pincus International Partners, L.P., a Delaware limited partnership ("WPIP"), together with two affiliated limited partnerships, Warburg Pincus Netherlands International Partners I C.V., a company incorporated under the laws of the Netherlands ("WPIP Netherlands") and WP-WPIP Investors L.P., a Delaware limited partnership ("WPIP Investors", and together with WPIP Netherlands and WPIP, the "WPIP Funds").

F2 · 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 the WPIP Funds are managed by Warburg Pincus LLC, a New York limited liability company ("WP LLC").

F3 · ownership.nature: Mr. Krieger is a Partner of WP and a Managing Director and Member of WP LLC. By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as a Partner of WP and a Managing Director and Member of WP LLC, Mr. Krieger may be deemed to be the beneficial owner of the Common Shares reported on this Form 4. Pursuant to Rule 16a-1(a)(4) under the Exchange Act, Mr. Krieger herein states that this filing shall not be deemed an admission that he is the beneficial owner of any of the Common Shares covered hereby. Mr. Krieger disclaims beneficial ownership of the Common Shares reported on this Form 4, except to the extent of his pecuniary interest in such Common Shares.

SEC source: 0000899243-18-025011 · 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: 135,227

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: 0000899243-18-025011 · 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: 995,919

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: 0000899243-18-025011 · 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: 1,199,476

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: 0000899243-18-025011 · 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: 761,020

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: 0000899243-18-025011 · 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: 46,665,299

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: 0001509991-18-000045 · wf-form4_152840352122291.xml · nonDerivative · entry 1

Ogunlesi Adebayo O. · CIK 0001481450 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,477,900

F1 · shares: .These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest 100% on the earlier of June 5, 2019 or the day immediately preceding the date of the Issuer's first annual shareholder meeting following the date of grant, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-18-000046 · wf-form4_152840360963795.xml · nonDerivative · entry 1

TONG CHRIS · CIK 0001191413 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 180,687

F1 · shares: .These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest 100% on the earlier of June 5, 2019 or the day immediately preceding the date of the Issuer's first annual shareholder meeting following the date of grant, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-18-000043 · wf-form4_152840344025419.xml · nonDerivative · entry 1

GOODWIN DEANNA L · CIK 0001730316 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,903

F1 · shares: .These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest 100% on the earlier of June 5, 2019 or the day immediately preceding the date of the Issuer's first annual shareholder meeting following the date of grant, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-18-000041 · wf-form4_152840312100397.xml · nonDerivative · entry 1

Dearlove Sir Richard Billing · CIK 0001564643 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 107,299

F1 · shares: .These restricted share units were granted under the Issuer's Long Term Incentive Plan (the "Plan") and are scheduled to vest 100% on the earlier of June 5, 2019 or the day immediately preceding the date of the Issuer's first annual shareholder meeting following the date of grant, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-18-000034 · wf-form4_152823021232947.xml · nonDerivative · entry 3

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 404,760

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: 0001509991-18-000034 · wf-form4_152823021232947.xml · nonDerivative · entry 2

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 408,625

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: 0001509991-18-000034 · wf-form4_152823021232947.xml · nonDerivative · entry 1

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 439,543

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on June 23, 2014, 2018 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: 0001509991-18-000033 · wf-form4_152823008567340.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,234,625

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: 0001509991-18-000033 · wf-form4_152823008567340.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,245,899

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: 0001509991-18-000033 · wf-form4_152823008567340.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,336,090

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on June 23, 2014, 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: 0001509991-18-000032 · wf-form4_152822992253949.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,446,833

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: 0001509991-18-000032 · wf-form4_152822992253949.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,459,482

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: 0001509991-18-000032 · wf-form4_152822992253949.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,560,668

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on June 23, 2014 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: 0001509991-18-000031 · wf-form4_152822973524601.xml · nonDerivative · entry 3

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 417,504

F3 · 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: 0001509991-18-000031 · wf-form4_152822973524601.xml · nonDerivative · entry 2

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 422,446

F3 · 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: 0001509991-18-000031 · wf-form4_152822973524601.xml · nonDerivative · entry 1

Haas Eric · CIK 0001567222 · SVP, Production & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 461,984

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on June 23, 2014 under the Issuer's Long Term Incentive Plan (the "Plan") that vested based on the level of achievement of the applicable performance condition.

F2 · balance_after: Reflects the exempt distribution of 136,184 shares from the reporting person pursuant to a DRO.

SEC source: 0001509991-18-000030 · wf-form4_152822962483420.xml · nonDerivative · entry 3

Doughty Jason · CIK 0001561919 · SVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 734,382

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: 0001509991-18-000030 · wf-form4_152822962483420.xml · nonDerivative · entry 2

Doughty Jason · CIK 0001561919 · SVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 739,756

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: 0001509991-18-000030 · wf-form4_152822962483420.xml · nonDerivative · entry 1

Doughty Jason · CIK 0001561919 · SVP and General Counsel

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 782,742

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on June 23, 2014 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: 0001509991-18-000029 · wf-form4_152822944936005.xml · nonDerivative · entry 3

Ball Christopher James · CIK 0001585399 · SVP, Planning and Bus. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 714,865

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: 0001509991-18-000029 · wf-form4_152822944936005.xml · nonDerivative · entry 2

Ball Christopher James · CIK 0001585399 · SVP, Planning and Bus. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 720,979

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: 0001509991-18-000029 · wf-form4_152822944936005.xml · nonDerivative · entry 1

Ball Christopher James · CIK 0001585399 · SVP, Planning and Bus. Dev.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 769,886

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on June 23, 2014 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: 0001509991-18-000017 · wf-form4_152287222415446.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,303,526

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: 0001509991-18-000017 · wf-form4_152287222415446.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,312,405

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: 0001509991-18-000017 · wf-form4_152287222415446.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,489,978

F1 · shares: Represents shares issued on settlement of restricted share units granted to the reporting person on April 1, 2014 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: 0001509991-18-000008 · wf-form4_151761007038346.xml · nonDerivative · entry 1

NOBEL PAUL · CIK 0001247295 · Senior VP, CAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 360,973

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 1 of each of 2019, 2020 and 2021, subject to the terms of the Plan and the applicable award agreement issued thereunder.

SEC source: 0001509991-18-000007 · wf-form4_151761000521004.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,145,614

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 1 of each of 2019, 2020 and 2021, subject to the terms of the Plan and the applicable award agreement issued thereunder.