Result of Equity Issue

DALLAS, Texas, MARCH 10, 2026- Kosmos Energy Ltd. ("Kosmos" or the "Company") (NYSE/LSE:KOS) announced today the pricing of its registered underwritten public offering of 97,500,000 shares of common stock (the "Offering") at a price to the public of $1.90, resulting in gross proceeds to Kosmos of $185,250,000. In addition, Kosmos has granted the underwriters a 30-day option to purchase up to an additional 14,625,000 shares of common stock at the public offering price less underwriting discounts. The Offering is expected to close on March 12, 2026, subject to customary closing conditions.

Kosmos intends to use the net proceeds from this offering to repay outstanding borrowings under its commercial debt facility and repayment of additional outstanding debt.

Barclays and Stifel are acting as joint book-running managers in the Offering.

The Offering is being made pursuant to an effective shelf registration statement, including a prospectus, filed by Kosmos with the U.S. Securities and Exchange Commission ("SEC") on June 20, 2024. The Offering may only be made by means of a prospectus supplement and an accompanying prospectus. The preliminary prospectus supplement and accompanying prospectus relating to the Offering has been filed, and the final prospectus supplement and accompanying base prospectus relating to the Offering will be filed, with the SEC. You may access these documents for free by visiting EDGAR on the SEC website at www.sec.gov. Alternatively, we, the underwriters or any dealer participating in the offering will arrange to send you the preliminary prospectus supplement and the accompanying prospectus upon request to: Barclays Capital Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, by telephone at 1-888-603-5847 or by e-mail at barclaysprospectus@broadridge.com and Stifel, Nicolaus & Company, Incorporated, Attention: Syndicate Department, 1201 Wills St., Suite 600, Baltimore, MD 21231, by telephone at (855) 300-7136 or by email at SyndProspectus@Stifel.com.