News Release Details

DALLAS--(BUSINESS WIRE)--May. 20, 2013-- Kosmos Energy Ltd. (“Kosmos”) (NYSE: KOS) announced today results from the Sipo-1 exploration well onshore Cameroon. Drilled on the Ndian River Block in the Rio del Rey Basin, the well was targeting the Miocene Isongo Formation. The Sipo-1 well was located approximately 14 kilometers (8 miles) onshore and was drilled to a total depth of 1,725 meters (5,660 feet). Oil and gas shows evidenced during drilling indicated a working petroleum system; however, the well failed to encounter commercial reservoirs.

Following the completion of drilling operations, including plugging and abandoning of the well, the drilling rig will be released. Full well assessment and the integration of drilling results into the Company’s geologic models is ongoing to determine forward exploration plans on Kosmos’ onshore Cameroon acreage position. Kosmos has now completed its drilling program commitment on the Ndian River Block.

Kosmos holds a 100 percent participating interest in the Ndian River Block. Associated with the results of the well, the Company will record approximately $75 million to exploration expense in its second quarter 2013 results.

About Kosmos Energy

Kosmos Energy is a leading independent oil and gas exploration and production company focused on frontier and emerging areas along the Atlantic Margin. The Company’s asset portfolio includes existing production and other major project developments offshore Ghana, as well as exploration licenses with significant hydrocarbon potential offshore Ireland, 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 Kosmos expects, believes or anticipates will or may occur in the future are forward-looking statements. Kosmos’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 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’s 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.

Source: Kosmos Energy Ltd.

Kosmos Energy Ltd.
Investor Relations
Brad Whitmarsh, +1-214-445-9772
bwhitmarsh@kosmosenergy.com