GTA FLNG Commercial Operations Date Reached

KOSMOS ENERGY CONFIRMS COMMERCIAL OPERATIONS DATE REACHED FOR GOLAR'S FLNG GIMI AT GREATER TORTUE AHMEYIM

DALLAS, Texas, June 23, 2025-- Kosmos Energy (NYSE/LSE: KOS) notes the announcement by Golar LNG Limited ("Golar") that the FLNG Gimi has reached Commercial Operations Date ("COD") for the 20-year Lease and Operate Agreement with BP for the Greater Tortue Ahmeyim (GTA) project offshore Mauritania and Senegal.

The announcement of COD marks a significant milestone for the project partners, as LNG production volumes have successfully been ramped up to a level equivalent to the annual contracted volumes of approximately 2.4 million tonnes per annum (mtpa), or around 90% of nameplate capacity of 2.7mtpa.

The achievement of COD follows first LNG in February and the first LNG cargo in April. The second and third LNG cargo were exported in May and early June respectively and a fourth cargo is currently loading. The fifth cargo is expected at the start of the third quarter. With this expected cargo timing, Kosmos forecasts 3.5 gross cargos in the second quarter.

Achieving COD and the recent ramp up in cargo lifting activity highlights continued strong cooperation between the project partners and Golar.

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.

###