Results of Operations and Financial Condition. On August 3, 2026, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter ended June 30, 2026. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liabi…

Completion of Acquisition or Disposition of Assets. On June 16 , 2026 , Kosmos Energy Ltd. (the “Company”) completed its previously announced sale (the “Transaction”) of its participating interests in the Ceiba Field and Okume Complex production assets located in Block G offshore Equatorial Guinea to a subsidiary of Panoro Energy ASA (“Panoro”). The Transaction was governed by the Share Sale and Purchase Agreement, dated February 24, 2026 (the “Purchase Agreement”), by and between Kosmos Ener…

Results of Operations and Financial Condition. On May 5, 2026, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter ended March 31, 2026. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liabili…

Results of Operations and Financial Condition. On March 2, 2026, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter and year ended December 31, 2025. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subj…

Entry into a Material Definitive Agreement. On February 24, 2026, Kosmos Energy Operating (“KEO”), a wholly-owned subsidiary of Kosmos Energy Ltd. (“Kosmos” or the “Company”), and Panoro Energy Block G Limited (the “Purchaser”), a wholly-owned subsidiary of Panoro Energy ASA, entered into a Share Sale and Purchase Agreement (the “SPA”) for the sale of all of the shares of KEO’s wholly-owned subsidiary, Kosmos International Petroleum, Inc., which indirectly holds a 40.375% participating intere…

Regulation FD Disclosure. Early Tender Results On January 29, 2026, Kosmos Energy Ltd. (“Kosmos” or the “Company”) announced the early tender results of its previously announced cash tender offer (the “Tender Offer”) for up to $250,000,000 aggregate principal amount of Kosmos’s outstanding 7.750% Senior Notes due 2027 (the “Notes”). The Tender Offer is being made upon the terms and subject to the conditions set forth in the offer to purchase dated January 12, 2026 (as amended and supplemented…

Regulation FD Disclosure. Tender Offer Early Tender Time Extension On January 26, 2026, Kosmos Energy Ltd. (“Kosmos” or the “Company”) announced that it is extending the Early Tender Time and Withdrawal Deadline (each as defined in the Company’s Offer to Purchase dated January 12, 2026, as amended and supplemented (the “Offer to Purchase”)) relating to the Company’s cash tender offer (the “Tender Offer”) of up to $250.0 million aggregate principal amount of its outstanding 7.750% Senior Notes…

of this Current Report), raising aggregate gross proceeds of at least equal to $350.0 million, and the release from escrow of the net proceeds from the New Bond Offering (the “Financing Condition”), as further described in the Offer to Purchase. The New Bonds and the guarantees in respect thereof have not been and will not be registered under the United States Securities Act of 1933, as amended (the “Securities Act”). Only Holders of the Notes who subscribe for and who are allocated New Bonds…

Regulation FD Disclosure. Tender Offer On January 12, 2026, Kosmos Energy Ltd. “Kosmos” or the “Company”) commenced a cash tender offer (the “Tender Offer”) for $250,000,000 aggregate principal amount (the “Notes Cap”) of Kosmos’s outstanding 7.750% Senior Notes due 2027 (the “Notes”). Kosmos reserves the right to modify the Notes Cap in its sole discretion. The Tender Offer is being made upon the terms and subject to the conditions set forth in the offer to purchase dated January 12, 2026 (t…

Regulation FD. On January 2, 2026, Kosmos Energy Ltd. (the “Company”) will issue a conditional notice of redemption with respect to all outstanding principal amount of its 7.125% senior notes due 2026 (the “Notes”). Redemption of the Notes is expected to occur on January 13, 2026, and will be funded by a draw by the Company under its Senior Secured Term Loan Credit Agreement, dated as of September 24, 2025. This Current Report on Form 8-K does not constitute a notice of redemption with respec…

Results of Operations and Financial Condition. On November 3, 2025, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter ended September 30, 2025. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject t…

Regulation FD. The Company issued a conditional notice of partial redemption on September 25, 2025, with respect to $150,000,000 principal amount of its 7.125% senior notes due 2026 (the “ Notes ”). Redemption of the Notes will occur on October 6, 2025. 3 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: September 30, 2025 KOSMOS EN…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Entry into a Material Definitive Agreement On September 24, 2025, Kosmos Energy Ltd. (the “ Company ”) announced that its wholly owned subsidiary, Kosmos Energy Gulf of Mexico Operations, LLC (the “ Borrower ”), and certain of Borrower’s Gulf of America related affiliates (the “ Guarantors ”) entered into a Senior Secured Term Loan Credit Agreement (the “ Credit Agreement ”) with Shell Trading (US) Company (“ STUSCO ”, or the “ Lender ”) and Ankura Trust Company, LLC, as administrative agent…

Chief Commercial Officer — Christopher J. Ball: Mr. Christopher J. Ball is retiring as Chief Commercial Officer, with his responsibilities transitioning to Neal D. Shah.

Results of Operations and Financial Condition. On August 4, 2025, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter ended June 30, 2025. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liabi…

Results of Operations and Financial Condition. On May 6, 2025, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter ended March 31, 2025. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liabili…

Results of Operations and Financial Condition. On February 24, 2025, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter and year ended December 31, 2024. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise…

Results of Operations and Financial Condition. On November 4, 2024, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter ended September 30, 2024. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject t…

Termination of a Material Definitive Agreement. As previously disclosed, Kosmos Energy Ltd. (the “ Company ”) and certain of its subsidiaries were party to a Revolving Credit Facility Agreement dated March 31, 2022, with The Standard Bank of South Africa Limited, as Facility Agent, Crédit Agricole Corporate and Investment Bank, as Security and Intercreditor Agent, and the other financial institutions listed therein (as amended or as amended and restated from time to time, the “ Corporate Revo…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Entry into a Material Definitive Agreement In connection with the previously announced private offering of $500 million aggregate principal amount of 8.750% senior notes due 2031 (the “Notes”) to eligible purchasers, Kosmos Energy Ltd. (the “Company”) issued such Notes under the indenture dated September 24, 2024 (the “Indenture”) among the Company, the guarantors named therein (the “Guarantors”), Wilmington Trust, National Association, as trustee, paying agent, transfer agent and registrar,…

Other Events. On September 10, 2024, the Company announced that it has priced an offering of $500,000,000 aggregate principal amount of its 8.750% senior notes due 2031 (the “New Notes”). The offering is expected to close on September 24, 2024, subject to customary closing conditions. The Company intends to use the net proceeds from the offering of the New Notes, together with cash on hand, to fund the tender offers for a portion of its 7.125% Senior Notes due 2026, 7.750% Senior Notes due 20…

Other Events. Notes Offering and Concurrent Tender Offers On September 9, 2024, the Company announced that it has commenced an offering of $500,000,000 aggregate principal amount of new senior notes due 2031 (the “New Notes”) and concurrent cash tender offers (the “Tender Offers”) to purchase (i) up to $400,000,000 aggregate principal amount of the Company’s outstanding 7.125% Senior Notes due 2026 and (ii) up to $100,000,000 aggregate principal amount of the Company’s outstanding 7.750% Seni…

Results of Operations and Financial Condition. On August 5, 2024, Kosmos Energy Ltd. (the “Company”) issued a news release announcing results for the fiscal quarter ended June 30, 2024. A copy of the news release issued by the Company is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K and Exhibit 99.1 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liabi…