CameroonFinal preparations to begin drilling at the Sipo-1 prospect, located on the Ndian River Block, onshore Cameroon, are underway. The drilling rig is currently being assembled on location, with plans to initiate drilling around the end of 2012 and results expected in the first quarter of 2013. Kosmos operates the Ndian River Block with a 100 percent participating interest. Suriname The Company’s joint exploration agreement with Chevron, whereby Kosmos agreed to assign half of its participating interest in Blocks 42 and 45, offshore Suriname, was formally approved by Staatsolie Maatschappii Suriname N.V., the national oil company of Suriname. Following the approvals, Kosmos retains a 50 percent participating interest and remains operator of both deepwater blocks during the exploration phase. Chevron will be development operator of any commercial discoveries. The Company completed acquisition of a large 3D seismic survey early in the fourth quarter of 2012, and data processing and interpretation will be conducted during 2013. Mauritania Offshore Mauritania, Kosmos anticipates initiating a large 2D seismic data acquisition, covering portions of the Company’s deepwater blocks C8, C12, and C13, in the first half of 2013. A 3D seismic program is expected to commence later in the year. Kosmos operates Blocks C8, C12, and C13 with a 90 percent participating interest. Morocco Further processing and interpretation of the 3D seismic data covering the Company’s Essaouira and Foum Assaka blocks is ongoing. Kosmos operates the Foum Assaka Block with a 56.25 percent participating interest. In addition, the Company has recently executed an agreement to acquire an additional 37.5 percent interest in the Essaouira Block, which will increase the Company’s operated participating interest to 75 percent, subject to final government approvals. About Kosmos Energy Kosmos Energy is a leading independent oil and gas exploration and production company focused on frontier and emerging areas in Africa and South America. The Company’s asset portfolio includes existing production, major discoveries and exploration prospects offshore Ghana, as well as exploration licenses with significant hydrocarbon potential offshore Mauritania, Morocco and Suriname and onshore Cameroon. Kosmos is listed on the New York Stock Exchange and is traded under the ticker symbol KOS. 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 the Company expects, believes or anticipates will or may occur in the future are forward-looking statements. The Company’s 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 the Company 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 the Company. 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 the Company, 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 the Company’s Securities and Exchange Commission (“SEC”) filings. The Company’s SEC filings are available on the Company’s website at www.kosmosenergy.com . 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.