Senior Secured Term Loan with Shell

KOSMOS ENERGY ENTERS INTO Senior SEcured TERM loan facility
with shell for up to $250 MILLION

DALLAS, Texas, September 25, 2025 - Kosmos Energy (NYSE/LSE: KOS) ("Kosmos" or the "Company") announced today that its wholly-owned subsidiary, Kosmos Energy Gulf of Mexico Operations, LLC ("the Borrower"), has entered into a senior secured term loan facility (the "Term Facility") with Shell Trading (US) Company  ("STUSCO" or "Lender"), with funding anticipated on October 1, 2025.

The Term Facility provides up to $250 million to be used for the repayment of the Company's outstanding unsecured notes. The Term Facility is structured in two tranches, with the first tranche of $150 million to be drawn at close and used to partially redeem the Company's outstanding 2026 unsecured notes ($250 million outstanding). A second tranche of $100 million is available for drawing until April 1, 2026. The Term Facility has an interest rate of SOFR + 3.75%, is secured against the Borrower's assets in the Gulf of America and has a final maturity date of four years after closing.

Neal Shah, Chief Financial Officer, said "We continue to be proactive in improving the resilience of the company's balance sheet in a volatile commodity price environment by raising new liquidity on attractive terms and addressing near-term maturities. With production near record high levels and capital at multi-year lows, closing the Term Loan facility complements our near-term goal of organically reducing net debt through free cash flow generation from our high-quality assets while also continuing to grow our strategic relationship with Shell in the Gulf of America."

About Kosmos Energy

Kosmos Energy is a leading deepwater exploration and production company focused on meeting the world's growing demand for energy. We have diversified oil and gas production from assets offshore Ghana, Equatorial Guinea, Mauritania, Senegal and the Gulf of America. Additionally, in the proven basins where we operate we are advancing high-quality development opportunities, which have come from our exploration success. Kosmos is listed on the NYSE and LSE and is traded under the ticker symbol KOS. As an ethical and transparent company, Kosmos is committed to doing things the right way. The Company's Business Principles articulate our commitment to transparency, ethics, human rights, safety and the environment. Read more about this commitment in the Kosmos Sustainability Report. For additional information, visit www.kosmosenergy.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements, other than statements of historical facts, included in this press release that address activities, events or developments that Kosmos expects, believes or anticipates will or may occur in the future are forward-looking statements. Kosmos' estimates and forward-looking statements are mainly based on its current expectations and estimates of future events and trends, which affect or may affect its businesses and operations. Although Kosmos believes that these estimates and forward-looking statements are based upon reasonable assumptions, they are subject to several risks and uncertainties and are made in light of information currently available to Kosmos. When used in this press release, the words "anticipate," "believe," "intend," "expect," "plan," "will" or other similar words are intended to identify forward-looking statements. Such statements are subject to a number of assumptions, risks and uncertainties, many of which are beyond the control of Kosmos, which may cause actual results to differ materially from those implied or expressed by the forward-looking statements. Further information on such assumptions, risks and uncertainties is available in Kosmos' Securities and Exchange Commission ("SEC") filings. Kosmos undertakes no obligation and does not intend to update or correct these forward-looking statements to reflect events or circumstances occurring after the date of this press release, except as required by applicable law. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release. All forward-looking statements are qualified in their entirety by this cautionary statement.

Management does not provide a reconciliation for forward looking non GAAP financial measures where it is unable to provide a meaningful or accurate calculation or estimation of reconciling items and the information is not available without unreasonable effort. This is due to the inherent difficulty of forecasting the occurrence and the financial impact of various items that have not yet occurred, are out of our control or cannot be reasonably predicted. For the same reasons, management is unable to address the probable significance of the unavailable information. Forward looking non GAAP financial measures provided without the most directly comparable GAAP financial measures may vary materially from the corresponding GAAP financial measures.

###

Source: Kosmos Energy Ltd.

Investor Relations

Jamie Buckland

+44 (0) 203 954 2831

[email protected]

Media Relations

Thomas Golembeski

+1-214-445-9674

[email protected]