Kosmos Energy Ltd.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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Kosmos Energy Ltd.

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A MESSAGE FROM OUR CHAIRMAN AND CEO

Fellow shareholders:

Over the past year, we have focused on improving the business and its ability to perform through the cycle. As we move through 2026, that work is starting to show in higher production, a lower cost base, and a clearer path to increased financial resilience. Energy markets remain volatile, and at the time of writing oil prices are higher than they have been in recent years. How long this will last, and how much prices may move, remains uncertain. That is why our agenda is focused on operational delivery to supply the energy the world needs – together with measured investment, strict cost discipline, and reducing debt. Our priorities for 2026 are clear and practical: grow production by around 15% year on year, reduce operating costs by 20%, and lower net debt by at least 10%. We have aligned our capital allocation, operating plans, and leadership focus behind those goals, and they will remain unchanged through market volatility.

Maintaining and growing Jubilee production takes a consistent drilling program, high facility uptime, steady water injection, and advanced subsurface imaging to support well selection – actions we are focused on delivering. The 2026 drilling campaign is well underway and building momentum, with further production increases expected as additional wells come online through the year. For 2026, Jubilee production is forecast at 70,000–80,000 bopd gross. With the Jubilee and TEN licenses now extended to 2040, we are aligned with our partners and the government of Ghana on continued investment to support higher production.

Greater Tortue Ahmeyim (GTA) Phase 1 exited 2025 at the floating LNG vessel’s 2.7 million tonnes per annum nameplate production capacity and has performed well early in 2026, with production year-to-date around 2.9 million tonnes per annum. This year, we are targeting 32-36 gross LNG cargoes, up from 18.5 last year. Unit operating costs per mmbtu are expected to decline materially versus 2025 as higher volumes, a lower-cost operating approach, and the FPSO refinancing flow through the cost base. Looking ahead, GTA Phase 1+ is structured to further reduce unit costs and support domestic gas sales to Mauritania and Senegal as the countries’ infrastructure becomes ready to receive the gas. Senegal has begun planning the build-out of its domestic gas pipeline network, an important step toward connecting future volumes to demand centers for power and industrial use.

In the Gulf of America, the Tiberius development is progressing, with a planned post-FID farm-down to keep our capital commitment at the right level. We are also preparing the Trailblazer exploration prospect for planned 2027 drilling as part of our strategic alliance with Shell. Both projects are being paced deliberately within a lean capital program and against clear capital-allocation priorities.

We expect 2026 capital expenditures of approximately $350 million, with the majority directed to the high-return Jubilee drilling program in Ghana. At the same time, we are executing material operating cost reductions during 2026 and continuing to high-grade the portfolio. Together with improved operating performance, these actions are designed to support debt reduction and strengthen the business through the cycle.

Operating responsibly remains a core part of our strategy and of how we create long-term value. Our portfolio is anchored by low-cost, lower carbon oil and gas production, which positions us as a reliable and responsible producer as countries balance energy security and affordability with the need to reduce emissions. External recognition does not define our performance, but it is a useful indicator that our approach is being recognized. In 2025, Kosmos earned MSCI’s highest possible AAA rating for the fourth consecutive year, placing us in the top quartile of companies in our sector. We were also named by Newsweek and Statista as one of America’s Most

Responsible Companies for the sixth consecutive year. We believe this matters because responsible operations, quality assets, and disciplined execution go together. They support our relationships with host governments and partners, strengthen our license to operate, and position the business to generate value for shareholders over the long term.

Our focus for 2026 is delivery: increasing production from our core assets, lowering costs, and reducing debt. We will continue to advance selective, high-value opportunities, but within a capital framework tightly aligned with attractive returns and balance-sheet priorities. We look forward to sharing more at our annual meeting. On behalf of the entire board of directors, I thank you for your investment, continued trust and support.

Sincerely yours,

Andrew G. Inglis

Chairman and Chief Executive Officer