Exhibit 4.1

ADDADDADDADD DESIGNATION MR PO BOX 4321 A SAMPLE 43004, (IF . ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS# COMMON STOCK PAR VALUE $0.01 Certificate Number COMMON STOCK Shares * * 0 0 0 0 0 0 * * * * * * * * * * * * * * * * * * ANY) Providence, RI 02940 - 3004 ZQ00000000 THIS CERTIFIES THAT KOSMOS ENERGY LTD. INCORPORATED UNDER THE LAWS OF DELAWARE Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** MrMR.Alexander.DavidSAMPLEample****Mr.AlexanderDavid&SampleMRS****Mr.Alexander.SAMPLEDavidSample****Mr.Alexander&David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David MRSample****.Mr. SAMPLEAlexanderDavidSample****Mr. &AlexanderMRSDavidSample.**** SAMPLEMr.AlexanderDavidSample**** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. lexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr. Sample * * * 0 0 0 0 0 0 * * * * * * * * * * * * * * * * * * * * * 0 0 0 0 0 0 * * * * * * * * * * * * * * * * * * * * * 0 0 0 0 0 0 * * * * * * * * * * * * * * * * * * * * * 0 0 0 0 0 0 * * * * * * * * * * * * * * SEE REVERSE FOR CERTAIN DEFINITIONS CUSIP 500688 10 6 Total 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 Certificate DTC Number Insurance Holder CUSIP Transaction of ID Numbers Shares Value is the registered holder of **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares*** *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares**** 000000**Shares 000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0 THIS CERTIFICATE IS TRANSFERABLE IN 00000**Shares 000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00 0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000***ZERO HUNDREDTHOUSAND CITIES DESIGNATED BY THE TRANSFER 000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000 AGENT, AVAILABLE ONLINE AT 00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000 0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000 **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*ZEROHUNDREDANDZERO*** www.computershare.com *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000** Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S fully paid and non-assessable common stock of the par value of US $0.01 each in the share capital of Kosmos Energy Ltd. (hereinafter called the “Company”), subject to the Certificate of Incorporation and Bylaws of the Company and transferable in accordance therewith. This certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar. Witness, the facsimile seal of the Company and the facsimile signatures of its duly authorised officers. 6 5 4 3 2 1 Num/No 12345678 . 123456789012345 6 54 32 1 Denom 1,000,000 XXXXXX . . XX 76 5 4 3 2 1 Total 12345600 XXXXXXXXXXX 

KOSMOS ENERGY LTD. (THE “COMPANY”) THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH REGISTERED HOLDER WHO SO REQUESTS, A SUMMARY OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OF THE COMPANY AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS, AND THE VARIATIONS IN RIGHTS, PREFERENCES AND LIMITATIONS DETERMINED FOR EACH SERIES, WHICH ARE FIXED BY THE CERTIFICATE OF INCORPORATION AND BYLAWS OF THE COMPANY, AND THE RESOLUTIONS OF THE BOARD OF DIRECTORS OF THE COMPANY, AND THE AUTHORITY OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS FOR FUTURE SERIES. SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE COMPANY OR TO THE TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE REGISTERED HOLDER OF A LOST OR DESTROYED SHARE CERTIFICATE, OR HIS LEGAL REPRESENTATIVES, TO GIVE THE COMPANY A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR DESTRUCTION OF ANY SUCH CERTIFICATE. The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: TEN COM - as tenants in common UNIF GIFT MIN ACT -........ Custodian....... (Cust) (Minor) TEN ENT - as tenants by the entireties under Uniform Gifts to Minors Act.......(State) JT TEN - as joint tenants with right of survivorship UNIF TRF MIN ACT -............................................ Custodian (until age................................ ) (Cust) .... under Uniform Transfers to Minors Act................... (Minor) (State) Additional abbreviations may also be used though not in the above list. PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE For value received, ____ hereby sell, assign and transfer unto ___ ___ ___ ____ (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) ___ ___ ___ _____ ___ ___ ___ _______ ___ ___ ______ Shares represented by the within Certificate, and do hereby irrevocably constitute and appoint ___ ___ ___ ______________ Attorney to transfer the said Shares on the books of the within-named Company with full power of substitution in the premises. Dated: __________________ 20__________________ Signature: ___ _________ Signature: ___ _________ Notice: The signature to this assignment must correspond with the name as written upon the face of the certificate, in every particular, without alteration or enlargement, or any change whatever. Signature(s) Guaranteed: Medallion Guarantee Stamp THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan Associations and Credit Unions) WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15.