10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

xQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2012

oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                    

Commission file number:  001-35167

Kosmos Energy Ltd.

(Exact name of registrant as specified in its charter)

Bermuda	98-0686001
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)

Clarendon House
2 Church Street
Hamilton, Bermuda	HM 11
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code:  +1 441 295 5950

Not applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer o	Accelerated filer o
Non-accelerated filer x	Smaller reporting company o
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes o  No x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	Outstanding at October 31, 2012
Common Shares, $0.01 par value	388,937,188

KOSMOS ENERGY LTD.

INDEX

	Page
PART I. FINANCIAL INFORMATION
Glossary and Select Abbreviations	1
Item 1. Financial Statements
Consolidated Balance Sheets as of September 30, 2012 and December 31, 2011	3
Consolidated Statements of Operations for the three and nine months ended September 30, 2012 and 2011	4
Consolidated Statements of Comprehensive Income (Loss) for the three and nine months ended September 30, 2012 and 2011	5
Consolidated Statements of Shareholders’ Equity for the nine months ended September 30, 2012	6
Consolidated Statements of Cash Flows for the nine months ended September 30, 2012 and 2011	7
Notes to Consolidated Financial Statements	8
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	27
Item 3. Quantitative and Qualitative Disclosures about Market Risk	37
Item 4. Controls and Procedures	38
PART II. OTHER INFORMATION
Item 1. Legal Proceedings	39
Item 1A. Risk Factors	39
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	39
Item 3. Defaults Upon Senior Securities	39
Item 4. Mine Safety Disclosures	39
Item 5. Other Information	39
Item 6. Exhibits	39
Signatures	40
Index to Exhibits	41

KOSMOS ENERGY LTD.

GLOSSARY AND SELECT ABBREVIATIONS

The following are abbreviations and definitions of certain terms used in this report. Unless listed below, all defined terms under Rule 4-10(a) of Regulation S-X shall have their statutorily prescribed meanings.

“2D seismic data”	Two-dimensional seismic data, serving as interpretive data that allows a view of a vertical cross-section beneath a prospective area.
“3D seismic data”	Three-dimensional seismic data, serving as geophysical data that depicts the subsurface strata in three dimensions. 3D seismic data typically provides a more detailed and accurate interpretation of the subsurface strata than 2D seismic data.
“API”	A specific gravity scale, expressed in degrees, that denotes the relative density of various petroleum liquids. The scale increases inversely with density. Thus lighter petroleum liquids will have a higher API than heavier ones.
“ASC”	Financial Accounting Standards Board Accounting Standards Codification.
“ASU”	Financial Accounting Standards Board Accounting Standards Update.
“Barrel” or “Bbl”	A standard measure of volume for petroleum corresponding to approximately 42 gallons at 60 degrees Fahrenheit.
“BBbl”	Billion barrels of oil.
“BBoe”	Billion barrels of oil equivalent.
“Bcf”	Billion cubic feet.
“Boe”	Barrels of oil equivalent. Volumes of natural gas converted to barrels of oil using a conversion factor of 6,000 cubic feet of natural gas to one barrel of oil.
“Boepd”	Barrels of oil equivalent per day.
“Bopd”	Barrels of oil per day.
“Bwpd”	Barrels of water per day.
“Developed acreage”	The number of acres that are allocated or assignable to productive wells or wells capable of production.
“Development”	The phase in which an oil or natural gas field is brought into production by drilling development wells and installing appropriate production systems.
“Dry hole”	A well that has not encountered a hydrocarbon bearing reservoir expected to produce in commercial quantities.
“E&P”	Exploration and production.
“FASB”	Financial Accounting Standards Board.
“Farm-in”	An agreement whereby an oil company acquires a portion of the working interest in a block from the owner of such interest, usually in return for cash and for taking on a portion of the drilling costs of one or more specific wells or other performance by the assignee as a condition of the assignment.
“FPSO”	Floating production, storage and offloading vessel.
“MBbl”	Thousand barrels of oil.
“Mcf”	Thousand cubic feet of natural gas.
“Mcfpd”	Thousand cubic feet per day of natural gas.
“MMBbl”	Million barrels of oil.
“MMBoe”	Million barrels of oil equivalent.
“MMcf”	Million cubic feet of natural gas.
“Natural gas liquid” or “NGL”	Components of natural gas that are separated from the gas state in the form of liquids. These include propane, butane, and ethane, among others.
“Petroleum contract”	A contract in which the owner of minerals gives an E&P company temporary and limited rights, including an exclusive option, to explore for, develop, and produce minerals from the lease area.
“Petroleum system”	A petroleum system consists of organic material that has been buried at a sufficient depth to allow adequate temperature and pressure to expel hydrocarbons and cause the movement of oil from the area in which it was formed to a reservoir rock where it can accumulate.
“Plan of development” or “PoD”	A written document outlining the steps to be undertaken to develop a field.
“Productive well”	An exploratory or development well found to be capable of producing either oil or natural gas in sufficient quantities to justify completion as an oil or natural gas well.

1

“Prospect(s)”	A potential trap that may contain hydrocarbons and is supported by the necessary amount and quality of geologic and geophysical data to indicate a probability of oil and/or natural gas accumulation ready to be drilled. The five required elements (generation, migration, reservoir, seal and trap) must be present for a prospect to work and if any of them fail neither oil nor natural gas will be present, at least not in commercial volumes.
“Proved reserves”	Estimated quantities of crude oil, natural gas and natural gas liquids that geological and engineering data demonstrate with reasonable certainty to be economically recoverable in future years from known reservoirs under existing economic and operating conditions, as well as additional reserves expected to be obtained through confirmed improved recovery techniques, as defined in SEC Regulation S-X 4-10(a)(2).
“Proved developed reserves”	Proved developed reserves are those proved reserves that can be expected to be recovered through existing wells and facilities and by existing operating methods.
“Proved undeveloped reserves”	Proved undeveloped reserves are those proved reserves that are expected to be recovered from future wells and facilities, including future improved recovery projects which are anticipated with a high degree of certainty in reservoirs which have previously shown favorable response to improved recovery projects.
“Shelf margin”	The path created by the change in direction of the shoreline in reaction to the filling of a sedimentary basin.
“Structural trap”	A structural strap is a topographic feature in the earth’s subsurface that forms a high point in the rock strata. This facilitates the accumulation of oil and gas in the strata.
“Structural-stratigraphic trap”	A structural-stratigraphic trap is a combination trap with structural and stratigraphic features.
“Stratigraphy”	The study of the composition, relative ages and distribution of layers of sedimentary rock.
“Stratigraphic trap”	A stratigraphic trap is formed from a change in the character of the rock rather than faulting or folding of the rock and oil is held in place by changes in the porosity and permeability of overlying rocks.
“Submarine fan”	A fan-shaped deposit of sediments occurring in a deep water setting where sediments have been transported via mass flow, gravity induced, processes from the shallow to deep water. These systems commonly develop at the bottom of sedimentary basins or at the end of large rivers.
“Three-way fault trap”	A structural trap where at least one of the components of closure is formed by offset of rock layers across a fault.
“Trap”	A configuration of rocks suitable for containing hydrocarbons and sealed by a relatively impermeable formation through which hydrocarbons will not migrate.
“Undeveloped acreage”	Lease acreage on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of natural gas and oil regardless of whether such acreage contains discovered resources.

2

KOSMOS ENERGY LTD.

CONSOLIDATED BALANCE SHEETS

(In thousands, except share data)

	September 30,			December 31,
	2012			2011
	(Unaudited)
Assets
Current assets:
Cash and cash equivalents	$	399,650		$	673,092
Restricted cash	21,336			23,747
Receivables:
Joint interest billings	113,946			199,699
Oil sales	106,561			109,475
Other	1,560			981
Inventories	37,992			27,101
Prepaid expenses and other	9,801			13,913
Current deferred tax assets	48,040			64,473
Derivatives	3,185			—
Total current assets	742,071			1,112,481
Property and equipment:
Oil and gas properties, net of accumulated depletion of $262,698 and $135,622, respectively	1,474,696			1,367,265
Other property, net of accumulated depreciation of $10,614 and $8,068, respectively	15,704			9,776
Property and equipment, net	1,490,400			1,377,041
Other assets:
Restricted cash	29,300			3,800
Deferred financing costs, net of accumulated amortization of $13,164 and $6,582, respectively	48,639			54,847
Long-term deferred tax assets	8,750			3,765
Total assets	$	2,319,160		$	2,551,934
Liabilities and shareholders’ equity
Current liabilities:
Accounts payable	$	128,231		$	278,006
Accrued liabilities	64,693			37,194
Derivatives	24,722			24,407
Total current liabilities	217,646			339,607
Long-term liabilities:
Long-term debt	1,000,000			1,110,000
Derivatives	6,094			8,427
Asset retirement obligations	22,662			20,670
Deferred tax liability	88,027			47,608
Other long-term liabilities	12,507			4,896
Total long-term liabilities	1,129,290			1,191,601
Shareholders’ equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at September 30, 2012 and December 31, 2011	—			—
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 391,411,703 and 390,530,946 issued at September 30, 2012 and December 31, 2011, respectively	3,914			3,905
Additional paid-in capital	1,687,669			1,629,453
Accumulated deficit	(714,782		)	(616,148		)
Accumulated other comprehensive income	3,817			3,522
Treasury stock, at cost, 2,454,279 and 649,818 shares at September 30, 2012 and December 31, 2011, respectively	(8,394		)	(6		)
Total shareholders’ equity	972,224			1,020,726
Total liabilities and shareholders’ equity	$	2,319,160		$	2,551,934

See accompanying notes.

3

KOSMOS ENERGY LTD.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Revenues and other income:
Oil and gas revenue	$	222,375		$	230,262		$	450,360		$	446,914
Interest income	137			2,492			1,165			7,459
Other income	725			91			930			735
Total revenues and other income	223,237			232,845			452,455			455,108
Costs and expenses:
Oil and gas production	44,873			24,185			71,791			58,481
Exploration expenses	37,359			11,005			93,904			104,657
General and administrative	40,666			39,093			114,788			72,140
Depletion and depreciation	63,794			42,593			128,442			88,960
Amortization - deferred financing costs	2,194			2,194			6,582			13,999
Interest expense	20,213			16,581			43,717			55,239
Derivatives, net	24,529			(4,984		)	26,407			5,250
Loss on extinguishment of debt	—			—			—			59,643
Doubtful accounts expense	—			—			—			(39,782		)
Other expenses, net	(64		)	(79		)	728			(18		)
Total costs and expenses	233,564			130,588			486,359			418,569
Income (loss) before income taxes	(10,327		)	102,257			(33,904		)	36,539
Income tax expense	25,923			50,481			64,730			48,505
Net income (loss)	(36,250		)	51,776			(98,634		)	(11,966		)
Accretion to redemption value of convertible preferred units	—			—			—			(24,442		)
Net income (loss) attributable to common shareholders/unit holders	$	(36,250	)	$	51,776		$	(98,634	)	$	(36,408	)
Net income (loss) per share attributable to common shareholders:
Basic	$	(0.10	)	$	0.13		$	(0.27	)
Diluted	$	(0.10	)	$	0.13		$	(0.27	)
Pro forma basic										$	(0.03	)
Pro forma diluted										$	(0.03	)
Weighted average number of shares used to compute net income (loss) per share:
Basic	373,448			368,996			371,140
Diluted	373,448			369,341			371,140
Pro forma basic										349,792
Pro forma diluted										349,792

See accompanying notes.

4

KOSMOS ENERGY LTD.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(In thousands)

(Unaudited)

	Three Months Ended September 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
Net income (loss)	$	(36,250	)	$	51,776	$	(98,634	)	$	(11,966	)
Other comprehensive income (loss):
Reclassification adjustments for derivative (gains) losses included in net income (loss)	(133		)	1,193		295			2,934
Income tax benefit	—			—		—			—
Other comprehensive income (loss)	(133		)	1,193		295			2,934
Comprehensive income (loss)	$	(36,383	)	$	52,969	$	(98,339	)	$	(9,032	)

See accompanying notes.

5

KOSMOS ENERGY LTD.

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(In thousands)

(Unaudited)

										Accumulated
				Additional						Other
	Common Shares			Paid-in			Accumulated			Comprehensive		Treasury
	Shares	Amount		Capital			Deficit			Income		Stock			Total
Balance as of December 31, 2011	390,531	$	3,905	$	1,629,453		$	(616,148	)	$	3,522	$	(6	)	$	1,020,726
Equity-based compensation	—	—		58,215			—			—		—			58,215
Derivatives, net	—	—		—			—			295		—			295
Restricted stock awards	881	9		(9		)	—			—		—			—
Restricted stock forfeitures	—	—		10			—			—		(10		)	—
Purchase of treasury stock	—	—		—			—			—		(8,378		)	(8,378		)
Net loss	—	—		—			(98,634		)	—		—			(98,634		)
Balance as of September 30, 2012	391,412	$	3,914	$	1,687,669		$	(714,782	)	$	3,817	$	(8,394	)	$	972,224

See accompanying notes.

6

KOSMOS ENERGY LTD.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Nine Months Ended September 30,
	2012			2011
Operating activities
Net loss	$	(98,634	)	$	(11,966	)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depletion, depreciation and amortization	135,024			102,959
Deferred income taxes	51,867			37,176
Unsuccessful well costs	19,357			87,845
Non-cash change in fair value of derivatives	13,847			16,946
Cash settlements on derivatives	(18,755		)	(4,779		)
Equity-based compensation	58,215			29,264
Doubtful accounts expense	—			(39,782		)
Loss on extinguishment of debt	—			59,643
Other	7,739			1,939
Changes in assets and liabilities:
(Increase) decrease in receivables	89,102			(40,279		)
(Increase) decrease in inventories	(7,812		)	2,126
(Increase) decrease in prepaid expenses and other	4,112			(2,455		)
Increase (decrease) in accounts payable	(127,025		)	33,729
Increase (decrease) in accrued liabilities	23,073			(5,220		)
Net cash provided by operating activities	150,110			267,146
Investing activities
Oil and gas assets	(272,681		)	(282,098		)
Other property	(9,030		)	(1,928		)
Notes receivable	—			4,448
Restricted cash	(23,089		)	85,551
Net cash used in investing activities	(304,800		)	(194,027		)
Financing activities
Borrowings under long-term debt	—			1,393,000
Payments on long-term debt	(110,000		)	(1,438,000		)
Net proceeds from the initial public offering	—			580,374
Purchase of treasury stock	(8,378		)	—
Deferred financing costs	(374		)	(52,466		)
Net cash provided by (used in) financing activities	(118,752		)	482,908
Net increase (decrease) in cash and cash equivalents	(273,442		)	556,027
Cash and cash equivalents at beginning of period	673,092			100,415
Cash and cash equivalents at end of period	$	399,650		$	656,442
Supplemental cash flow information
Cash paid for:
Interest	$	30,247		$	36,854
Income taxes	$	16,620		$	850

See accompanying notes.

7

KOSMOS ENERGY LTD.

Notes to Consolidated Financial Statements

(Unaudited)

1. Organization

Kosmos Energy Ltd. was incorporated pursuant to the laws of Bermuda in January 2011 to become a holding company for Kosmos Energy Holdings. Kosmos Energy Holdings is a privately held Cayman Islands company that was formed March 5, 2004. As a holding company, Kosmos Energy Ltd.’s management operations are conducted through a wholly owned subsidiary, Kosmos Energy, LLC. The terms “Kosmos,” the “Company,” “we,” “us,” “our,” “ours,” and similar terms when used in the present tense or prospectively or for historical periods since May 16, 2011 refer to Kosmos Energy Ltd. and its wholly owned subsidiaries and for historical periods prior to May 16, 2011 refer to Kosmos Energy Holdings and its wholly owned subsidiaries, unless the context indicates otherwise.

We are an independent oil and gas exploration and production company currently focused on frontier and emerging areas in Africa and South America. Our asset portfolio includes existing production, discoveries and exploration prospects offshore Ghana, as well as petroleum contracts offshore Mauritania, Morocco and Suriname and onshore Cameroon. Kosmos Energy Ltd. transitioned from its development stage to operational activities in January 2011. Accordingly, reporting as a development stage company is no longer deemed necessary.

In May 2012, Kosmos entered into an agreement with Chevron Global Energy Inc. (“Chevron”) under which Kosmos will assign half of its interest in Block 42 and Block 45, offshore Suriname, to Chevron. Upon receipt of approval from the Suriname government and the closing of the agreement, each party will have a 50% working interest in Block 42 and Block 45.

We have one business segment, which is the exploration and production of oil and natural gas. Substantially all of our long-lived assets and product sales are related to production located offshore Ghana.

2. Accounting Policies

General

The interim-period financial information presented in the consolidated financial statements included in this report is unaudited and, in the opinion of management, includes all adjustments of a normal recurring nature necessary to present fairly the consolidated financial position as of September 30, 2012, the consolidated results of operations for the three and nine months ended September 30, 2012 and 2011, and consolidated cash flows for the nine months ended September 30, 2012 and 2011. The results of the interim periods shown in this report are not necessarily indicative of the final results to be expected for the full year. These consolidated financial statements and the accompanying notes should be read in conjunction with our audited consolidated financial statements for the year ended December 31, 2011, included in our annual report on Form 10-K.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Kosmos Energy Ltd. and its wholly owned subsidiaries. All intercompany transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosures of contingent assets and liabilities. Actual results could differ from these estimates.

Reclassifications

Certain prior period amounts have been reclassified to conform with the current year presentation. Such reclassifications had no impact on our reported net income, current assets, total assets, current liabilities, total liabilities or shareholders equity.

Cash and Cash Equivalents

Cash and cash equivalents includes demand deposits and funds invested in highly liquid instruments with original maturities of three months or less at the date of purchase.

8

Restricted Cash

In accordance with our commercial debt facility, we are required to maintain a restricted cash balance that is sufficient to meet the payment of interest and fees for the next six-month period. As of September 30, 2012 and December 31, 2011, we had $21.3 million and $23.7 million, respectively, in current restricted cash to meet this requirement. Additionally as of September 30, 2012 and December 31, 2011, we had $29.3 million and $3.8 million, respectively, of long-term restricted cash used to cash collateralize performance guarantees related to our petroleum agreements.

Receivables

Our receivables consist of joint interest billings, oil sales and other receivables for which the Company generally does not require collateral security. Receivables from joint interest owners are stated at amounts due, net of any allowances for doubtful accounts. We determine our allowance by considering the length of time past due, future net revenues of the debtor’s ownership interest in oil and natural gas properties we operate, and the owner’s ability to pay its obligation, among other things. We did not have any allowances for doubtful accounts as of September 30, 2012 and December 31, 2011.

Inventories

Inventories consisted of $32.8 million and $26.9 million of materials and supplies and $5.2 million and $0.2 million of hydrocarbons as of September 30, 2012 and December 31, 2011, respectively. The Company’s materials and supplies inventory primarily consists of casing and wellheads and is stated at the lower of cost, using the weighted average cost method, or market.

Hydrocarbon inventory is carried at the lower of cost, using the weighted average cost method, or market. Hydrocarbon inventory costs include expenditures and other charges (including depletion) directly and indirectly incurred in bringing the inventory to its existing condition. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory costs.

Exploration and Development Costs

The Company follows the successful efforts method of accounting for its oil and gas properties. Acquisition costs for proved and unproved properties are capitalized when incurred. Costs of unproved properties are transferred to proved properties when a determination that proved reserves have been found. Exploration costs, including geological and geophysical costs and costs of carrying unproved properties, are expensed as incurred. Exploratory drilling costs are capitalized when incurred. If exploratory wells are determined to be commercially unsuccessful or dry holes, the applicable costs are expensed and recorded in exploration expenses on the consolidated statement of operations. Costs incurred to drill and equip development wells, including unsuccessful development wells, are capitalized. Costs incurred to operate and maintain wells and equipment and to lift oil and natural gas to the surface are expensed.

The Company evaluates unproved property periodically for impairment. These costs are generally related to the acquisition of leasehold costs. The impairment assessment considers results of exploration activities, commodity price outlooks, planned future sales or expiration of all or a portion of such projects. If the quantity of potential future reserves determined by such evaluations is not sufficient to fully recover the cost invested in each project, the Company will recognize an impairment loss at that time.

Depletion, Depreciation and Amortization

Proved properties and support equipment and facilities are depleted using the unit-of-production method based on estimated proved oil and natural gas reserves. Capitalized exploratory drilling costs that result in a discovery of proved reserves and development costs are amortized using the unit-of-production method based on estimated proved oil and natural gas reserves for the related field.

Depreciation and amortization of other property is computed using the straight-line method over the assets’ estimated useful lives (not to exceed the lease term for leasehold improvements), ranging from three to eight years.

	Years Depreciated
Leasehold improvements	6 to 8
Office furniture, fixtures and computer equipment	3 to 7
Vehicles	5

Amortization of deferred financing costs is computed using the straight-line method over the life of the related debt.

9

Capitalized Interest

Interest costs from external borrowings are capitalized on major projects with an expected construction period of one year or longer. Capitalized interest is added to the cost of the underlying asset and is amortized over the useful lives of the assets in the same manner as the underlying assets.

Asset Retirement Obligations

The Company accounts for asset retirement obligations as required by ASC 410—Asset Retirement and Environmental Obligations. Under these standards, the fair value of a liability for an asset retirement obligation is recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. If a reasonable estimate of fair value cannot be made in the period the asset retirement obligation is incurred, the liability is recognized when a reasonable estimate of fair value can be made. If a tangible long-lived asset with an existing asset retirement obligation is acquired, a liability for that obligation is recognized at the asset’s acquisition date. In addition, a liability for the fair value of a conditional asset retirement obligation is recorded if the fair value of the liability can be reasonably estimated. We capitalize the asset retirement costs by increasing the carrying amount of the related long-lived asset by the same amount as the liability. We record increases in the discounted abandonment liability resulting from the passage of time in depletion and depreciation in the consolidated statement of operations.

Variable Interest Entity

A variable interest entity (“VIE”), as defined by ASC 810—Consolidation, is an entity that by design has insufficient equity to permit it to finance its activities without additional subordinated financial support or equity holders that lack the characteristics of a controlling financial interest. VIEs are consolidated by the primary beneficiary, which is the entity that has the power to direct the activities of the VIE that most significantly impact the VIE’s performance and will absorb losses or receive benefits from the VIE that could potentially be significant to the VIE.

Our wholly owned subsidiary, Kosmos Energy Finance International, meets the definition of a VIE. The Company is the primary beneficiary of this VIE, which is consolidated in these financial statements.

Prior to the incorporation of Kosmos Energy Finance International on March 18, 2011, Kosmos Energy Finance International did not have any financial statement activity. Kosmos Energy Finance International’s assets and liabilities are shown separately on the face of the consolidated balance sheet as of September 30, 2012, and December 31, 2011, in the following line items: current restricted cash; deferred financing costs; long-term debt; and current and long-term derivatives liabilities. At September 30, 2012, Kosmos Energy Finance International had $119.8 million in cash and cash equivalents, $0.4 million in prepaid expenses and other, $0.6 million in accrued liabilities and $7.2 million in other long-term liabilities. At December 31, 2011, Kosmos Energy Finance International had $231.6 million in cash and cash equivalents, $0.1 million in other receivables, $1.2 million in accrued liabilities and $3.0 million in other long-term liabilities.

Impairment of Long-lived Assets

The Company reviews its long-lived assets for impairment when changes in circumstances indicate that the carrying amount of an asset may not be recoverable. ASC 360—Property, Plant and Equipment requires an impairment loss to be recognized if the carrying amount of a long-lived asset is not recoverable and exceeds its fair value. The carrying amount of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. That assessment shall be based on the carrying amount of the asset at the date it is tested for recoverability, whether in use or under development. An impairment loss shall be measured as the amount by which the carrying amount of a long-lived asset exceeds its fair value. Assets to be disposed of and assets not expected to provide any future service potential to the Company are recorded at the lower of carrying amount or fair value less cost to sell.

Derivative Instruments and Hedging Activities

We utilize oil derivative contracts to mitigate our exposure to commodity price risk associated with our anticipated future oil production. These derivative contracts consist of purchased puts, swaps with calls and three-way collars. We also use interest rate swap contracts to mitigate our exposure to interest rate fluctuations related to our long-term debt. Our derivative financial instruments are recorded on the balance sheet as either assets or liabilities and are measured at fair value. We do not apply hedge accounting to our oil derivative contracts. Effective June 1, 2010, we discontinued hedge accounting on our interest rate swap contracts. Therefore, from that date forward, the changes in the fair value of the instruments are recognized in earnings during the period of change. See Note 10—Derivative Financial Instruments.

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Estimates of Proved Oil and Natural Gas Reserves

Reserve quantities and the related estimates of future net cash flows affect our periodic calculations of depletion and assessment of impairment of our oil and natural gas properties. Proved oil and natural gas reserves are the estimated quantities of crude oil, natural gas and natural gas liquids that geological and engineering data demonstrate with reasonable certainty to be recoverable in future periods from known reservoirs under existing economic and operating conditions. As additional proved reserves are discovered, reserve quantities and future cash flows will be estimated by independent petroleum consultants and prepared in accordance with guidelines established by the Securities and Exchange Commission (“SEC”) and the FASB. The accuracy of these reserve estimates is a function of:

·the engineering and geological interpretation of available data;

·estimates of the amount and timing of future operating cost, production taxes, development cost and workover cost;

·the accuracy of various mandated economic assumptions; and

·the judgments of the persons preparing the estimates.

Revenue Recognition

We use the sales method of accounting for oil and gas revenues. Under this method, we recognize revenues on the volumes sold based on the provisional sales prices. The volumes sold may be more or less than the volumes to which we are entitled based on our ownership interest in the property. These differences result in a condition known in the industry as a production imbalance. A receivable or liability is recognized only to the extent that we have an imbalance on a specific property greater than the expected remaining proved reserves on such property. As of September 30, 2012 and December 31, 2011, we had no oil and gas imbalances recorded in our consolidated financial statements.

Our oil and gas revenues are based on provisional price contracts which contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from oil sales at the spot price on the date of sale. The embedded derivative, which is not designated as a hedge, is marked to market through oil and gas revenue each period until the final settlement occurs, which generally is limited to the month after the sale occurs.

Equity-based Compensation

For equity-based compensation awards, compensation expense is recognized in the Company’s financial statements over the awards’ vesting periods based on their grant date fair value. The Company utilizes (i) the closing stock price on the date of grant to determine the fair value of service vesting restricted stock awards and restricted stock units and (ii) a Monte Carlo simulation to determine the fair value of restricted stock awards and restricted stock units with a combination of market and service vesting criteria.

Treasury Stock

We record treasury stock purchases at cost. All of our treasury stock purchases are from our employees that surrendered shares to the Company to satisfy their minimum tax withholding requirements and were not part of a formal stock repurchase plan. Additionally, treasury stock includes forfeited restricted stock awards granted under our long-term incentive plan.

Income Taxes

The Company accounts for income taxes as required by ASC 740—Income Taxes. Under this method, deferred income taxes are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. On a quarterly basis, management evaluates the need for and adequacy of valuation allowances based on the expected realizability of the deferred tax assets and adjusts the amount of such allowances, if necessary.

We recognize tax benefits from uncertain tax positions only if it is more likely than not that the tax position will be sustained upon examination by the tax authorities, based on the technical merits of the position. Accordingly, we measure tax benefits from such positions based on the most likely outcome to be realized.

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Foreign Currency Translation

The U.S. dollar is the functional currency for the Company’s foreign operations. Foreign currency transaction gains and losses and adjustments resulting from translating monetary assets and liabilities denominated in foreign currencies are included in other expenses. Cash balances held in foreign currencies are not significant, and as such, the effect of exchange rate changes is not material to any reporting period.

Concentration of Credit Risk

There are a variety of factors which affect the market for oil, including the proximity and capacity of transportation facilities, demand for oil, the marketing of competitive fuels and the effects of government regulations on oil production and sales. Our revenue can be materially affected by current economic conditions and the price of oil. However, based on the current demand for crude oil and the fact that alternative purchasers are readily available, we believe that the loss of our marketing agent and/or any of the purchasers identified by our marketing agent would not have a long-term material adverse effect on our financial position or results of operations. We have required our marketing agent to post a letter of credit covering the estimated proceeds from our revenue transactions, until such proceeds are received.

Recent Accounting Standards

In December 2011, the FASB issued ASU No. 2011-11, “Disclosures about Offsetting Assets and Liabilities,” to improve reporting and transparency of offsetting (netting) assets and liabilities and the related effects on the financial statements. This ASU is effective for fiscal years and interim periods within those years beginning on or after January 1, 2013. We do not expect the adoption of this ASU will have a material effect on our consolidated financial statements.

3. Acquisition of FPSO

Effective May 7, 2010, Tullow Ghana Limited, a subsidiary of Tullow Oil plc, (“Tullow”) as Unit Operator for and on behalf of the Jubilee Unit partners under the Unitization and Unit Operating Agreement (“Jubilee UUOA”), entered into the Advance Payments Agreement with MODEC, Inc. (“MODEC”) related to partial funding of the construction of the FPSO. The maturity date of the Advance Payments Agreement was extended from September 15, 2011 through the acquisition date of the FPSO.

On December 29, 2011, Tullow as Unit Operator for and on behalf of the Jubilee Unit partners under the Jubilee UUOA, acquired the FPSO we are using to produce hydrocarbons from the Jubilee Field from MODEC for $754.5 million, or $202.6 million net to Kosmos. At the time of the acquisition of the FPSO, our note receivable under the Advance Payments Agreement was $102.8 million. To fund the purchase, we paid $99.8 million in cash and applied the note receivable due under the Advance Payments Agreement to the purchase. As of December 31, 2011 the remaining balance under the Advance Payments Agreement was zero. The acquisition was recorded as an increase to oil and gas property. Prior to the acquisition of the FPSO, the Jubilee Unit leased the FPSO from MODEC and the lease costs were recorded as oil and gas production costs.

4. Jubilee Field Unitization

The Jubilee Field in Ghana covers an area within both the West Cape Three Points (“WCTP”) and Deepwater Tano (“DT”) Blocks. Consistent with the Ghanaian Petroleum Law, the WCTP and DT Petroleum Agreements (“PAs”) and as required by Ghana’s Ministry of Energy, it was agreed the Jubilee Field would be unitized for optimal resource recovery. Kosmos and its partners negotiated a comprehensive unit operating agreement, the Jubilee UUOA, to unitize the Jubilee Field and govern each party’s respective rights and duties in the Jubilee Unit. The Jubilee UUOA was executed by all parties and was effective July 16, 2009. The tract participations were 50% for each block. Tullow is the Unit Operator, and Kosmos is the Technical Operator for the development of the Jubilee Field. Pursuant to the terms of the Jubilee UUOA, the tract participations are subject to a process of redetermination. The initial redetermination process was completed on October 14, 2011. Any party to the Jubilee UUOA with more than a 10% Jubilee Unit Interest may call for a second redetermination after December 1, 2013. As a result of the initial redetermination process, the tract participation was determined to be 54.36660% for the WCTP Block and 45.63340% for the DT Block. Our Unit Interest was increased from 23.50868% (our percentage after Tullow’s acquisition of EO Group Limited (“EO Group”) — see Note 5—Joint Interest Billings) to 24.07710%. The consolidated financial statements are based on these re-determined tract participations. As a result of the change in our Unit Interest, we recorded increases in joint interest billings receivables, oil and gas properties, notes receivable, inventories, oil and gas production expenses and general and administrative expenses of $67.6 million, $22.1 million, $2.5 million, $0.4 million, $1.6 million and $0.6 million, respectively, and an increase of $94.9 million in accounts payable as of December 31, 2011. Our capital costs related to the increased Unit Interest was paid during 2012. Although the Jubilee Field is unitized, our working interest in each block outside the Jubilee Unit area did not change. We remain operator of the WCTP Block outside the Jubilee Unit area.

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5. Joint Interest Billings

The Company’s joint interest billings consist of receivables from partners with interests in common oil and gas properties operated by the Company. Joint interest billings are classified on the face of the consolidated balance sheets as current receivables based on when collection is expected to occur. As of September 30, 2012 and December 31, 2011, we had $113.9 million and $199.7 million, respectively, included in current joint interest billings receivable.

EO Group’s share of costs under the WCTP PA incurred attributable to its WCTP Block interest were paid by Kosmos until first production. EO Group was required to reimburse Kosmos for all development costs paid on EO Group’s behalf upon commencement of production in 2010.

On July 22, 2011, Tullow acquired EO Group’s entire 3.5% interest in the WCTP PA, including the correlative interest in the Jubilee Unit. As a result of the transaction, we received full repayment of the long-term joint interest billing receivable related to Jubilee Field development costs we paid on EO Group’s behalf. The related valuation allowance of $39.8 million was reversed during the second quarter of 2011. In addition, our participation interest in the Jubilee Unit increased 0.01738%. This resulted from the elimination of EO Group’s carry by the other Jubilee owners of Ghana National Petroleum Corporation’s (“GNPC”) additional paying interest of 3.75% in the Jubilee Unit. Our working interest in the remainder of the WCTP Block was not changed by the transaction and remains 30.875% (before giving effect to GNPC’s optional additional paying interest).

6. Property and Equipment

Property and equipment is stated at cost and consisted of the following:

	September 30, 2012			December 31, 2011
	(In thousands)
Oil and gas properties:
Proved properties	$	696,047		$	607,338
Unproved properties	429,552			294,701
Support equipment and facilities	611,795			600,848
Total oil and gas properties	1,737,394			1,502,887
Less: accumulated depletion	(262,698		)	(135,622		)
Oil and gas properties, net	1,474,696			1,367,265
Other property, net	15,704			9,776
Property and equipment, net	$	1,490,400		S	1,377,041

We recorded depletion expense of $61.9 million and $41.3 million for the three months ended September 30, 2012 and 2011, respectively, and $123.3 million and $85.4 million for the nine months ended September 30, 2012 and 2011, respectively.  The Company had depletion costs of $3.9 million and nil included in crude oil inventory and other receivables as of September 30, 2012 and December 31, 2011, respectively.

7. Suspended Well Costs

The Company capitalizes exploratory well costs into oil and gas properties until a determination is made that the well has either found proved reserves or is impaired. If proved reserves are found, the capitalized exploratory well costs are reclassified to proved properties. The well costs are charged to expense if the exploratory well is determined to be impaired.

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The following table reflects the Company’s capitalized exploratory well costs on completed wells as of and during the nine months ended September 30, 2012. The table excludes $16.7 million in costs that were capitalized and subsequently expensed in the same period.

	September 30, 2012
	(In thousands)
Beginning balance (January 1, 2012)	$	267,592
Additions to capitalized exploratory well costs pending the determination of proved reserves	104,255
Reclassification due to determination of proved reserves	—
Capitalized exploratory well costs charged to expense	(2,627		)
Ending balance (September 30, 2012)	$	369,220

The following table provides aging of capitalized exploratory well costs based on the date drilling was completed and the number of projects for which exploratory well costs have been capitalized for more than one year since the completion of drilling:

	September 30, 2012		December 31,2011
	(In thousands, except well counts)
Exploratory well costs capitalized for a period of one year or less	$	129,389	$	132,838
Exploratory well costs capitalized for a period one to three years	239,831		134,754
Ending balance	$	369,220	$	267,592
Number of projects with exploratory well costs that have been capitalized for more than one year	7		3

As of September 30, 2012, the projects with exploratory well costs capitalized for more than one year since the completion of drilling are related to the Mahogany Area (formerly known as the Mahogany East Area), Teak-1, Teak-2 and Akasa discoveries in the WCTP Block and the Tweneboa, Enyenra and Ntomme discoveries in the DT Block, which are all in Ghana.

Mahogany Area—The Mahogany area, a combined area covering parts of the Mahogany discovery and the Mahogany Deep discovery area was declared commercial in September 2010, and a PoD was submitted to Ghana’s Ministry of Energy as of May 2, 2011. In a letter dated May 16, 2011, the Ministry of Energy did not approve the PoD and requested that the WCTP Block partners take certain steps regarding notifications of discovery and commerciality; and requested other information. The WCTP Block partners believe the combined submission was proper and have held meetings with GNPC which resolved issues relating to the PoD work program. From May 2011, GNPC and the WCTP Block partners continued working to resolve other differences; however, the WCTP PA contains specific timelines for PoD approval and discussions, which expired at the end of June 2011. On June 30, 2011, we, as Operator of the WCTP Block and on behalf of the WCTP Block partners, delivered a Notice of Dispute to the Ministry of Energy as provided under the WCTP PA, which is the initial step in triggering the formal dispute resolution process under the WCTP PA with the Government of Ghana regarding approval of the Mahogany PoD. This Notice of Dispute establishes a process for negotiation and consultation for a period of 30 days (or longer if mutually agreed) among senior representatives from the Ministry of Energy, GNPC and the WCTP Block partners to resolve the matter of approval of the PoD. We and the WCTP Block partners continue discussions with the Ministry of Energy and GNPC to resolve differences on the PoD.

Teak-1 Discovery—Two appraisal wells have been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Teak-1 discovery is expected to be made by the WCTP Block partners in 2013. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the WCTP PA.

Teak-2 Discovery—We have performed a gauge installation on the well and are reprocessing seismic data. Following additional appraisal and evaluation, a decision regarding commerciality of the Teak-2 discovery is expected to be made by the WCTP Block partners in 2013. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the WCTP PA.

Akasa Discovery—We have performed a drill stem test and gauge installation on the well and are analyzing the data. Following additional appraisal and evaluation, a decision regarding commerciality of the Akasa discovery is expected to be made by the WCTP Block partners in 2013. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the WCTP PA.

Ntomme Discovery—One appraisal well has been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Ntomme discovery is expected to be made by the DT Block partners by the end of 2012. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the DT PA.

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Tweneboa Discovery—Three appraisal wells have been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Tweneboa discovery is expected to be made by the DT Block partners by the end of 2012. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the DT PA. However, the DT Block partners have the option to request a new petroleum agreement for the non-associated gas within the Tweneboa discovery area, thereby extending the period of commercial assessment of the discovery.

Enyenra Discovery—Four appraisal wells have been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Enyenra discovery is expected to be made by the DT Block partners by the end of 2012. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the DT PA.

8. Accounts Payable and Accrued Liabilities

At September 30, 2012 and December 31, 2011, $128.2 million and $278.0 million, respectively, were recorded for invoices received but not paid. Accrued liabilities were $64.7 million and $37.2 million at September 30, 2012 and December 31, 2011, respectively, and consisted of the following:

	September 30, 2012		December 31, 2011
	(In thousands)
Accrued liabilities:
Accrued exploration, development and production	$	40,212	$	27,666
Accrued general and administrative expenses	11,303		2,159
Accrued taxes other than income	11,252		1,095
Accrued interest	620		1,208
Accrued income taxes	1,306		5,066
	$	64,693	$	37,194

9. Debt

In March 2011, the Company secured a $2.0 billion commercial debt facility (the “Facility”) from a number of financial institutions and extinguished the then existing commercial debt facilities. The Facility was syndicated to certain participants of the existing facilities, as well as new participants. The Facility supports our oil and gas exploration, appraisal and development programs and corporate activities. The total loan commitments of the Facility may be increased up to a maximum of $3.0 billion if the lenders increase their commitments or if loan commitments from new financial institutions are added. The International Finance Corporation entered the Facility in February 2012. The terms and conditions of the Facility remained consistent with the original terms and conditions, and the total commitment under the Facility remained unchanged.

As part of the debt refinancing in March 2011, the repayment of borrowings under the existing facility attributable to financial institutions that did not participate in the Facility was accounted for as an extinguishment of debt, and existing unamortized debt issuance costs attributable to those participants were expensed. For participants in the existing facility that participated in the Facility, an analysis was performed to determine if an exchange of debt instruments with substantially different terms had occurred. As a result, we recorded a $59.6 million loss on the extinguishment of debt. Additionally, we have $61.3 million of deferred financing costs related to the Facility, which are being amortized over the term of the Facility.

As of September 30, 2012, borrowings under the Facility totaled $1.0 billion. As of September 30, 2012, the undrawn availability under the Facility was $160.0 million. In October 2012, as part of the normal borrowing base determination process, the undrawn availability under the Facility was increased $180.4 million to $340.4 million. Interest expense was $8.2 million and $9.3 million (net of capitalized interest of $2.8 million and $1.0 million), and commitment fees were $1.5 million and $2.2 million for the three months ended September 30, 2012 and 2011, respectively. Interest expense was $26.6 million and $36.6 million (net of capitalized interest of $7.3 million and $3.0 million) and commitment fees were $4.8 million and $5.7 million for the nine months ended September 30, 2012 and 2011, respectively.

The interest is the aggregate of the applicable margin (3.25% to 4.75%, depending on the amount of the Facility that is being utilized and the length of time that has passed from the date the Facility was entered into); LIBOR; and mandatory cost (if any, as defined in the Facility). Interest is payable on the last day of each interest period (and, if the interest period is longer than six months, on the dates falling at six-month intervals after the first day of the interest period). We pay commitment fees on the undrawn and unavailable portion of the total commitments. Commitment fees for the lenders are equal to 40% per annum of the then-applicable respective margin when a commitment is available for utilization and, equal to 20% per annum of the then-applicable respective

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margin when a commitment is not available for utilization. The Company recognizes interest expense in accordance with ASC 835—Interest, which requires interest expense to be recognized using the effective interest method. We determined the effective interest rate based on the estimated level of borrowings under the Facility.  Accordingly, we recognized interest expense in excess of interest currently payable of $1.2 million and $1.0 million during the three months ended September 30, 2012 and 2011, respectively, and $4.3 million and $2.2 million during the nine months ended September 30, 2012 and 2011, respectively.

The Facility provides a revolving-credit and letter of credit facility for an availability period that expires on May 15, 2014 (in the case of the revolving-credit facility) and on the final maturity date (in the case of the letter of credit facility) of March 29, 2018. The available facility amount is subject to borrowing base constraints and also is constrained by the amortization schedule (once repayments under the Facility begin) commencing on May 15, 2014. The first required payment could be as early as June 15, 2014, subject to the level of outstanding borrowings.

We have the right to cancel all the undrawn commitments under the Facility. The amount of funds available to be borrowed under the Facility, also known as the borrowing base amount, was previously determined each year on June 15 and December 15 as part of a forecast that is prepared by and agreed to by Kosmos and the Technical and Modeling Banks; however, in April 2012, the lenders agreed to change the borrowing base determination dates to April 15 and October 15. The formula to calculate the borrowing base amount is based, in part, on the sum of the net present values of net cash flows and relevant capital expenditures reduced by certain ratios.

If an event of default exists under the Facility, the lenders can accelerate the maturity and exercise other rights and remedies, including the enforcement of security granted pursuant to the Facility over certain assets held by us.

We were in compliance with the financial covenants contained in the Facility as of the October 15, 2012 forecast, which requires the maintenance of:

·the field life cover ratio, not less than 1.30x; and

·the loan life cover ratio, not less than 1.10x.

The “field life cover ratio” is broadly defined, for each applicable forecast period, as the ratio of (x) net present value of net cash flow through the depletion of the Jubilee Field plus the net present value of capital expenditures incurred in relation to the Jubilee Field and certain other fields in Ghana, to (y) the aggregate loan amounts outstanding under the Facility. The “loan life cover ratio” is broadly defined, for each applicable forecast period, as the ratio of (x) net present value of net cash flow through the final maturity date of the Facility plus the net present value of capital expenditures incurred in relation to the Jubilee Field and certain other fields in Ghana, to (y) the aggregate loan amounts outstanding under the Facility.

At September 30, 2012, the scheduled maturities of debt during the five year period and thereafter are as follows:

	Payments Due by Year
	2012 (1)		2013		2014		2015		2016		Thereafter
	(In thousands)
Commercial debt facility(2)	$	—	$	—	$	—	$	—	$	444,444	$	555,556

(1)   Represents payments for the period October 1, 2012 through December 31, 2012.

(2)The scheduled maturities of debt are based on the level of borrowings and the available borrowing base as of September 30, 2012. Any increases or decreases in the level of borrowings or decreases in the available borrowing base would impact the scheduled maturities of debt during the five year period and thereafter.

10. Derivative Financial Instruments

We use financial derivative contracts to manage exposures to commodity price and interest rate fluctuations. We do not hold or issue derivative financial instruments for trading purposes.

We apply the provisions of ASC 815—Derivatives and Hedging, which require each derivative instrument to be recorded in the balance sheet at fair value. If a derivative has not been designated as a hedge or does not otherwise qualify for hedge accounting, it must be adjusted to fair value through earnings. We do not apply hedge accounting treatment to our oil derivative contracts and, therefore, the changes in the fair values of these instruments are recognized in earnings in the period the change occurred. These fair value changes are shown in our consolidated statements of operations.

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Effective June 1, 2010, we discontinued hedge accounting on all interest rate derivative instruments. Therefore, from that date forward, changes in the fair value of the instruments are recognized in earnings during the period of change. The effective portions of the discontinued hedges as of May 31, 2010, are included in accumulated other comprehensive income or loss (“AOCI”) in the equity section of the accompanying consolidated balance sheets, and are being transferred to earnings when the hedged transaction settles.

Oil Derivative Contracts

We enter into various oil derivative contracts to mitigate our exposure to commodity price risk associated with anticipated future oil production. These contracts currently consist of purchased puts, swaps with calls and three-way collars.

We manage market and counterparty credit risk in accordance with our policies and guidelines. In accordance with these policies and guidelines, our management determines the appropriate timing and extent of derivative transactions. We have included an estimate of nonperformance risk in the fair value measurement of our commodity derivative contracts as required by ASC 820—Fair Value Measurements and Disclosures.

The following table sets forth the volumes in barrels underlying the Company’s outstanding oil derivative contracts and the weighted average Dated Brent prices per Bbl for those contracts as of September 30, 2012.

			Weighted Average Price per Bbl
Term(1)	Type of Contract	MBbl	Deferred Premium		Swaps		Floor		Ceiling		Calls
2012:
October - December	Purchased puts	426	$	6.86	$	—	$	61.48	$	—	$	—
October - December	Swaps with calls	600	—		97.21		—		—		110.00
2013:
January - December	Three-way collars	1,500	$	4.82	$	—	$	95.00	$	105.00	$	125.00
January - December	Three-way collars	1,004	—		—		87.50		115.00		135.00

(1)In October 2012, we entered into costless three-way collar contracts for 1.0 MMBbl from January 2013 through December 2013 with a floor price of $90.00 per Bbl, a weighted average ceiling price of $115.39 per Bbl and a call price of $135.00 per Bbl. The three-way collar contracts are indexed to Dated Brent prices.

Provisional Oil Sales

At September 30, 2012, we had sales volumes of 995 MBbl priced at an average of $110.28 per bbl, after differentials, which are subject to final pricing over the next month.

Interest Rate Swaps Derivative Contracts

The following table summarizes our open interest rate swaps as of September 30, 2012:

Term	Weighted Average Notional Amount		Weighted Average Fixed Rate		Floating Rate
	(In thousands)
October 2012 — December 2012	$	306,420	1.98	%	6-month LIBOR
January 2013 — December 2013		227,103	2.06	%	6-month LIBOR
January 2014 — December 2014		133,434	1.99	%	6-month LIBOR
January 2015 — December 2015		45,319	2.03	%	6-month LIBOR
January 2016 — June 2016		12,500	2.27	%	6-month LIBOR

Effective June 1, 2010, the Company discontinued hedge accounting on all existing interest rate derivative instruments. Prior to June 1, 2010, any ineffectiveness on the interest rate swaps was immaterial; therefore, no amount was recorded in earnings for ineffectiveness. We have included an estimate of nonperformance risk in the fair value measurement of our interest rate derivative contracts as required by ASC 820—Fair Value Measurements and Disclosures.

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The following tables disclose the Company’s derivative instruments as of September 30, 2012 and December 31, 2011:

		Estimated Fair Value
		Asset (Liability)
		September 30,			December 31,
Type of Contract	Balance Sheet Location	2012			2011
		(In thousands)
Derivatives not designated as hedging instruments:
Derivative asset:
Commodity	Derivatives assets — current	$	3,185		$	—
Derivative liability:
Commodity(1)(2)	Derivatives liabilities — current	(20,306		)	(20,303		)
Interest rate	Derivatives liabilities — current	(4,416		)	(4,104		)
Commodity(3)	Derivatives liabilities — long-term	(2,715		)	(4,457		)
Interest rate	Derivatives liabilities — long-term	(3,379		)	(3,970		)
Total derivatives not designated as hedging instruments		$	(27,631	)	$	(32,834	)

(1)Includes $3.5 million and $3.2 million, as of September 30, 2012 and December 31, 2011, of cash settlements made on our purchased puts and swaps with calls which were settled in the month subsequent to period end.

(2)Includes deferred premiums of $8.7 million related to various purchased puts and three-way collar contracts.

(3)Includes deferred premiums of $2.4 million related to three-way collar contracts.

		Amount of Gain/(Loss)						Amount of Gain/(Loss)
		Three Months Ended September 30,						Nine months Ended September 30,
Type of Contract	Location of Gain/(Loss)	2012			2011			2012			2011
		(In thousands)
Derivatives in cash flow hedging relationships:
Interest rate(1)	Interest expense	$	133		$	(1,193	)	$	(295	)	$	(2,934	)
Total derivatives in cash flow hedging relationships		$	133		$	(1,193	)	$	(295	)	$	(2,934	)
Derivatives not designated as hedging instruments:
Commodity(2)	Oil and gas revenue	$	11,494		$	1,320		$	15,221		$	1,171
Commodity	Derivatives, net	(24,529		)	4,984			(26,407		)	(5,250		)
Interest rate	Interest expense	(931		)	(3,921		)	(2,366		)	(9,933		)
Total derivatives not designated as hedging instruments		$	(13,966	)	$	2,383		$	(13,552	)	$	(14,012	)

(1)Amounts were reclassified from AOCI into earnings.

(2)Amounts represent the mark-to-market portion of our provisional oil sales contracts.

The fair value of the effective portion of the derivative contracts on May 31, 2010, is reflected in AOCI and is being transferred to interest expense over the remaining term of the contracts. In accordance with the mark-to-market method of accounting, the Company recognizes changes in fair values of its derivative contracts as gains or losses in earnings during the period in which they occur. The Company expects to reclassify $1.3 million of gains from AOCI to interest expense within the next 12 months. See
Note 11—Fair Value Measurements for additional information regarding the Company’s derivative instruments.

11. Fair Value Measurements

In accordance with ASC 820—Fair Value Measurements and Disclosures, fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are classified into two categories: observable inputs and unobservable inputs. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect

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a company’s own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. We prioritize the inputs used in measuring fair value into the following fair value hierarchy:

·Level 1—quoted prices for identical assets or liabilities in active markets.

·Level 2—quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs derived principally from or corroborated by observable market data by correlation or other means.

·Level 3—unobservable inputs for the asset or liability.

The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety.

The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2012 and December 31, 2011, for each fair value hierarchy level:

	Fair Value Measurements Using:
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
	(Level 1)		(Level 2)			(Level 3)		Total
	(In thousands)
September 30, 2012
Assets:
Money market accounts	$	271,270	$	—		$	—	$	271,270
Commodity derivatives	—		3,185			—		3,185
Liabilities:
Commodity derivatives	—		(23,021		)	—		(23,021		)
Interest rate derivatives	—		(7,795		)	—		(7,795		)
Total	$	271,270	$	(27,631	)	$	—	$	243,639
December 31, 2011
Assets:
Money market accounts(1)	$	489,761	$	—		$	—	$	489,761
Liabilities:
Commodity derivatives	—		(24,760		)	—		(24,760		)
Interest rate derivatives	—		(8,074		)	—		(8,074		)
Total	$	489,761	$	(32,834	)	$	—	$	456,927

(1)As reported in our annual report on Form 10-K, the Level 1 fair value measurements excluded $27.5 million of restricted cash. The table above has been revised to properly include this amount.

All fair values have been adjusted for nonperformance risk resulting in a decrease of the commodity derivative liabilities of approximately $0.5 million and a decrease of the interest rate derivatives of approximately of $0.2 million as of September 30, 2012. When the accumulated net present value for all of the derivative contracts with a counterparty is in an asset position, the Company uses the counterparty’s credit default swap (“CDS”) rates to estimate non-performance risk. When the accumulated net present value for all derivative contracts for a counterparty are in a liability position, we use our internal rate of borrowing to estimate our non-performance risk.

The book values of cash and cash equivalents and restricted cash approximate fair value based on Level 1 inputs. Joint interest billings, oil sales and other receivables, and accounts payable and accrued liabilities approximate fair value due to the short-term nature of these instruments. The carrying values of our debt approximates fair value since they are subject to short-term floating interest rates that approximate the rates available to us for those periods. Our long-term receivables, if any, after any allowances for doubtful accounts approximate fair value. The estimates of fair value of these items are based on Level 2 inputs.

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Commodity Derivatives

Our commodity derivatives represent crude oil purchased puts, swaps with calls and three-way collars for notional barrels of oil at fixed Dated Brent oil prices. The values attributable to the our oil derivatives are based on (i) the contracted notional volumes, (ii) independent active futures price quotes for Dated Brent, (iii) a credit-adjusted yield curve applicable to each counterparty by reference to the CDS market and (iv) an independently sourced estimate of volatility for Dated Brent. The volatility estimate was provided by certain independent brokers who are active in buying and selling oil options and was corroborated by market-quoted volatility factors. The deferred premium is included in the fair market value of the puts and compound options. See Note 10—Derivative Financial Instruments for additional information regarding the Company’s derivative instruments.

Provisional Oil Sales

The value attributable to the provisional oil sales derivative is based on (i) the sales volumes subject to provisional pricing and (ii) an independently sourced forward curve over the term of the provisional pricing period.

Interest Rate Derivatives

As of September 30, 2012, we had interest rate swaps with notional amounts of $306.4 million, whereby the Company pays a fixed rate of interest and the counterparty pays a variable LIBOR-based rate. The values attributable to the Company’s interest rate derivative contracts are based on (i) the contracted notional amounts, (ii) LIBOR yield curves provided by independent third parties and corroborated with forward active market-quoted LIBOR yield curves and (iii) a credit-adjusted yield curve as applicable to each counterparty by reference to the CDS market.

12. Asset Retirement Obligations

The following table summarizes the changes in the Company’s asset retirement obligations:

	September 30, 2012
	(In thousands)
Asset retirement obligations:
Beginning asset retirement obligations	$	20,670
Liabilities incurred during period	—
Revisions in estimated retirement obligations	—
Liabilities settled during period	—
Accretion expense	1,992
Ending asset retirement obligations	$	22,662

The Ghanaian legal and regulatory regime regarding oil field abandonment and other environmental matters is evolving. Currently, no Ghanaian environmental regulations expressly require that companies abandon or remove offshore assets although under international industry standards we would do so. The Petroleum Law provides for restoration that includes removal of property and abandonment of wells, but further states the manner of such removal and abandonment will be as provided in the Regulations; however, such Regulations have not been promulgated. Under the Environmental Permit for the Jubilee Field, a decommissioning plan will be prepared and submitted to the Ghana Environmental Protection Agency. ASC 410—Asset Retirement and Environmental Obligations requires the Company to recognize this liability in the period in which the liability was incurred. We have recorded an asset retirement obligation for fields that have commenced production. Additional asset retirement obligations will be recorded in the period in which wells within such producing fields are commissioned.

13. Convertible Preferred Units

In May 2011, contemporaneous with Kosmos Energy Ltd.’s IPO, the Series A Convertible Preferred Units (“Series A Units”), Series B Convertible Preferred Units (“Series B Units”) and Series C Convertible Preferred Units (“Series C Units”) of Kosmos Energy Holdings were exchanged into our common shares based on the pre-offering equity value of such interests. This resulted in the Series A Units, Series B Units and Series C Units being exchanged into 163.1 million; 109.8 million; and 4.8 million common shares of Kosmos Energy Ltd., respectively, or 277.7 million common shares in the aggregate. The common shares have one vote per share and a par value of $0.01. The exchange of the Convertible Preferred Units had the effect of increasing the book value of shareholders’ equity by approximately $1.0 billion. Accretion to redemption value of the Convertible Preferred Units was recorded through the date of the exchange. After the date of the exchange, the related accretion on the Convertible Preferred Units ceased to

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accrue and all rights of the holders with respect to the Convertible Preferred Units terminated, except for the right to receive shares of common shares issuable upon the exchange and the rights entitled to a holder of a common share.

The Convertible Preferred Units were issued in separate series at an issue price of $10 per unit, $25 per unit, and $28.25 per unit, respectively. Under the Fourth Amended and Restated Operating Agreement of Kosmos Energy Holdings, as amended, (the “Agreement”) governing Kosmos Energy Holdings, the Convertible Preferred Units received distributions, if any, equal to the “Accreted Value” of the units, prior to any distributions to the common unit holders. The Accreted Value was defined in the Agreement as the unit purchase price plus the preferred return amount per unit equal to 7% of the Accreted Value per annum (compounded quarterly) for the first nine years after the year of Kosmos Energy Holdings’ initial operating agreement and 14% of the Accreted Value per annum (compounded quarterly) thereafter, unless a monetization event (as defined in the Agreement) occurred at which time the preferred return would revert to 7%. The holders of the Convertible Preferred Units received the accumulated preferred return upon the consummation of our IPO, as defined in the Agreement. The accumulated preferred return on the Convertible Preferred Units was recorded through the date of the offering. The amount was applied to additional paid-in capital first, with the remaining amount applied to the accumulated deficit. The Convertible Preferred Units were classified as mezzanine equity at December 31, 2010, as Kosmos Energy Holdings could not solely control the type of consideration issuable on the exchange and the Convertible Preferred Unit holders controlled Kosmos Energy Holdings’ Board of Directors.

We recorded accretion on the Convertible Preferred Units of $24.4 million for the nine months ended September 30, 2011.

14. Equity-based Compensation

Profit Units

Prior to our corporate reorganization, Kosmos Energy Holdings issued common units designated as profit units with a threshold value of $0.85 to $90 to employees, management and directors. Profit units, the defined term in the related agreements, are equity awards that are measured on the grant date and expensed over a vesting period of four years. Founding management and directors vested 20% as of the date of issuance and an additional 20% on the anniversary date for each of the next four years. Profit units issued to employees vested 50% on the second and fourth anniversary of the issuance date. Of the 100 million authorized common units, 15.7 million were designated as profit units.

The following is a summary of the Kosmos Energy Holdings’ profit unit activity immediately prior to the corporate reorganization:

			Weighted-Average
			Grant-Date
	Profit Units		Fair Value
	(In thousands)
Outstanding at December 31, 2010	13,910		$	1.76
Granted	1,783		15.71
Relinquished	(2,503	)	0.12
Outstanding at May 16, 2011	13,190		3.96

A summary of the status of the Kosmos Energy Holdings’ unvested profit units immediately prior to the corporate reorganization were as follows:

			Weighted-Average
	Unvested		Grant-Date
	Profit Units		Fair Value
	(In thousands)
Outstanding at December 31, 2010	3,464		$	1.60
Granted	1,783		15.71
Vested	(1,066	)	1.09
Relinquished	(1,253	)	0.10
Outstanding at May 16, 2011	2,928		11.02

Total profit unit compensation expense recognized in income was zero and $1.2 million for the three and nine months ended
September 30, 2011, respectively.

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The significant assumptions used to calculate the fair values of the profit units during 2011, as calculated using a binomial tree, were as follows: no dividend yield, expected volatility ranging from approximately 25% to 66%; risk-free interest rate ranging from 1.3% to 5.1%; expected life ranging from 1.2 to 8.1 years; and projected turnover rate of 7.0% for employees and none for management.

Restricted Stock Awards and Restricted Stock Units

As part of our corporate reorganization, vested profit units were exchanged for 31.7 million common shares of Kosmos Energy Ltd., unvested profit units were exchanged for 10.0 million restricted stock awards and the $90 profit units were cancelled. Based on the terms and conditions of our corporate reorganization, the exchange of profit units for common shares of Kosmos Energy Ltd. resulted in no incremental compensation costs.

In April 2011, the Board of Directors approved a Long-Term Incentive Plan (the “LTIP”), which provides for the granting of incentive awards in the form of stock options, stock appreciation rights, restricted stock awards, restricted stock units, among other award types. The LTIP provides for the issuance of 24.5 million shares pursuant to awards under the plan, in addition to the 10.0 million restricted stock awards exchanged for unvested profit units.

The following table shows the number of shares available for issuance pursuant to awards under the Company’s LTIP at September 30, 2012:

	Shares
	(In thousands)
Approved and authorized awards(1)	24,503
Awards issued after May 16, 2011(1)	(18,285	)
Awards forfeited(1)	86
Awards available for future grant	6,304

(1)Excludes 10.0 million restricted stock awards that were exchanged for unvested profit units and any related forfeitures of such awards. Also, excludes forfeited restricted stock awards issued in connection with our initial public offering, which include the May 18, 2011 and June 15, 2011 award tranches, as these awards are not available for future grant.

The Company records compensation expense equal to the fair value of share-based payments over the vesting periods of the LTIP awards. The Company recorded compensation expense from awards granted under our LTIP of $19.4 million and $20.1 million during the three months ended September 30, 2012 and 2011, respectively, and $58.2 million and $28.1 million during the nine months ended September 30, 2012 and 2011, respectively. Subsequent to May 16, 2011, the Company granted both restricted stock awards and restricted stock units with service vesting criteria and granted both restricted stock awards and restricted stock units with a combination of market and service vesting criteria under the LTIP.

The following table reflects the outstanding restricted stock awards as of September 30, 2012:

			Weighted-		Market / Service		Weighted-
	Service Vesting Restricted Stock		Average Grant-Date		Vesting Restricted Stock		Average Grant-Date
	Awards		Fair Value		Awards		Fair Value
	(In thousands)				(In thousands)
Outstanding at December 31, 2011	17,195		$	13.36	3,522		$	13.21
Granted	578		12.06		303		9.45
Forfeited	(852	)	13.77		(155	)	12.92
Vested	(5,202	)	9.97		—		—
Outstanding at September 30, 2012	11,719		14.77		3,670		12.91

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The following table reflects the outstanding restricted stock units as of September 30, 2012:

			Weighted-		Market / Service		Weighted-
	Service Vesting Restricted Stock		Average Grant-Date		Vesting Restricted Stock		Average Grant-Date
	Units		Fair Value		Units		Fair Value
	(In thousands)				(In thousands)
Outstanding at December 31, 2011	—		$	—	—		$	—
Granted	983		10.58		792		15.81
Forfeited	(23	)	10.98		(17	)	15.81
Vested	—		—		—		—
Outstanding at September 30, 2012	960		10.57		775		15.81

For equity-based compensation awards, compensation expense is recognized in the Company’s financial statements over the awards’ vesting periods based on their grant date fair value. The Company utilizes (i) the closing stock price on the date of grant to determine the fair value of service vesting restricted stock awards and service vesting restricted stock units and (ii) a Monte Carlo simulation to determine the fair value of restricted stock awards and restricted stock units with a combination of market and service vesting criteria.

For restricted stock awards with a combination of market and service vesting criteria, the number of common shares to be issued is determined by comparing the Company’s total shareholder return with the total shareholder return of a predetermined group of peer companies over the performance period and can vest in up to 100% of the awards granted. The grant date fair value of these awards ranged from $6.70 to $13.57 per award. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. The expected volatility utilized in the model was estimated using our historical volatility and the historical volatilities of our peer companies and ranged from 41.3% to 56.7%. The risk-free interest rate was based on the U.S. treasury rate for a term commensurate with the expected life of the grant and ranged from 0.5% to 1.1%.

For restricted stock units with a combination of market and service vesting criteria, the number of common shares to be issued is determined by comparing the Company’s total shareholder return with the total shareholder return of a predetermined group of peer companies over the performance period and can vest in up to 200% of the awards granted. The grant date fair value of these awards was $15.81 per award. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. The expected volatility utilized in the model was estimated using our historical volatility and the historical volatilities of our peer companies and was 54.0%. The risk-free interest rate was based on the U.S. treasury rate for a term commensurate with the expected life of the grant and was 0.5%.

15. Income Taxes

The income tax expense was $25.9 million and $50.5 million for the three months ended September 30, 2012 and 2011, respectively, and was $64.7 million and $48.5 million for the nine months ended September 30, 2012 and 2011, respectively. The income tax provision consists of U.S. and Ghanaian income and Texas margin taxes.

The components of income (loss) before income taxes were as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
	(In thousands)
Bermuda	$	(2,316	)	$	5,945	$	(8,735	)	$	(2,901	)
United States	3,145			3,430		9,492			4,239
Foreign—other	(11,156		)	92,882		(34,661		)	35,201
Income (loss) before income taxes	$	(10,327	)	$	102,257	$	(33,904	)	$	36,539

Our effective tax rate for the three months ended September 30, 2012 and 2011 was (251)% and 49%, respectively. For the nine months ended September 30, 2012 and 2011 our effective tax rate was (191)% and 133%. The effective tax rate for the United States is approximately 43% and 35% for the three months ended September 30, 2012 and 2011, respectively, and 116% and 36% for the nine months ended September 30, 2012 and 2011, respectively. The increase in the effective tax rate in the United States resulted from the difference between the amount deductible on our tax return for vested stock awards and the amount of cumulative compensation cost recognized for accounting purposes. The effective tax rate for Ghana ranges from 32% to 39% for all periods presented. The effective tax rate for our other foreign jurisdictions is 0%. Our other foreign jurisdictions have a 0% effective tax rate

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because they reside in countries with a 0% statutory rate, or we have experienced losses in those countries and have a full valuation allowance reserved against the corresponding net deferred tax assets.

The Company has no material unrecognized income tax benefits.

A subsidiary of the Company files a U.S. federal income tax return and a Texas margin tax return. In addition to the United States, the Company files income tax returns in the countries in which we operate. The Company is open to U.S. federal income tax examinations for tax years 2009 through 2011 and to Texas margin tax examinations for the tax years 2007 through 2011. In addition, the Company is open to income tax examinations for tax years as early as 2004 in its significant foreign jurisdictions (Ghana, Cameroon and Morocco).

The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense if they are considered probable, but has had no need to accrue any to date.

16. Net Income (Loss) Per Share

In the calculation of basic net income (loss) per common share attributable to common shareholders, participating securities are allocated earnings based on actual dividend distributions received plus a proportionate share of undistributed net income attributable to common shareholders, if any, after recognizing distributed earnings. The Company’s participating securities do not participate in undistributed net losses because they are not contractually obligated to do so. The computation of diluted net income (loss) per share attributable to common shareholders reflects the potential dilution that could occur if securities or other contracts to issue common shares that are dilutive were exercised or converted into common shares or resulted in the issuance of common shares that would then share in the earnings of the Company. During periods in which the Company realizes a loss from continuing operations attributable to common shareholders, securities would not be dilutive to net loss per share and conversion into common shares is assumed not to occur. Diluted net income (loss) per share attributable to common shareholders is calculated under both the two-class method and the treasury stock method and the more dilutive of the two calculations is presented.

Basic net income (loss) per share attributable to common shareholders is computed as (i) net income (loss) attributable to common shareholders, (ii) less income allocable to participating securities (iii) divided by weighted average basic shares outstanding. The Company’s diluted net income (loss) per share attributable to common shareholders is computed as (i) basic net income (loss) attributable to common shareholders, (ii) plus diluted adjustments to income allocable to participating securities (iii) divided by weighted average diluted shares outstanding.

Basic and diluted net income (loss) per share is not presented for periods prior to the completion of our IPO as the ownership structure of the Company prior to the IPO was not a common unit of ownership. Instead, pro forma net income (loss) attributable to common shares is presented. Pro forma net income (loss) attributable to common shares reflects net income (loss) as reported and gives effect to an adjustment to remove accretion on the Convertible Preferred Units. In our pro forma basic and diluted income (loss) per share attributable to common shareholders calculation, we assumed the conversion of the Convertible Preferred Units occurred on
January 1, 2011 and, therefore, we have removed the related accretion to determine pro forma net income (loss).

Pro forma weighted average common shares outstanding used in the computation of pro forma basic and diluted income (loss) per share attributable to common shareholders has been computed taking into account (1) the conversion ratio at the time of the IPO of all common units and Convertible Preferred Units into common shares as if the conversion occurred as of the beginning of the year and (2) the 34.5 million common shares issued by the Company in the IPO, which included 1.5 million common shares issued pursuant to the over-allotment option exercised by the underwriters of the IPO.

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The following table is a reconciliation of the Company’s net income (loss) attributable to common shareholders to basic and pro forma basic net income (loss) attributable to common shareholders and to diluted and pro forma diluted net income (loss) attributable to common shareholders and a reconciliation of basic and pro forma basic weighted average common shares outstanding to diluted and pro forma diluted weighted average common shares outstanding for the three and nine months ended September 30, 2012 and 2011:

	Three Months EndedSeptember 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
	(In thousands, except per share data)
Numerator:
Net income (loss) attributable to common shareholders	$	(36,250	)	$	51,776	$	(98,634	)	$	(36,408	)
Less: Basic income allocable to participating securities(1)	—			2,349		—			—
Basic net income (loss) attributable to common shareholders	(36,250		)	49,427		(98,634		)
Plus: Accretion to redemption value of convertible preferred units	—			—		—			24,442
Pro forma basic net loss attributable to common shareholders	—			—		—			(11,966		)
Diluted adjustments to income allocable to participating securities(1)	—			3		—			—
Diluted net income (loss) attributable to common shareholders	$	(36,250	)	$	49,430	$	(98,634	)
Pro forma diluted net loss attributable to common shareholders									$	(11,966	)
Denominator:
Weighted average number of shares used to compute net income (loss) per share:
Basic	373,448			368,996		371,140
Restricted stock awards(1)(2)	—			345		—
Diluted	373,448			369,341		371,140
Pro forma basic									349,792
Pro forma restricted stock awards(1)(2)									—
Pro forma diluted									349,792
Net income (loss) per share attributable to common shareholders:
Basic	$	(0.10	)	$	0.13	$	(0.27	)
Diluted	$	(0.10	)	$	0.13	$	(0.27	)
Pro forma basic									$	(0.03	)
Pro forma diluted									$	(0.03	)

(1)Our service vesting restricted stock awards represent participating securities because they participate in nonforfeitable dividends with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Our restricted stock awards with market and service vesting criteria and all restricted stock units are not considered to be participating securities and, therefore, are excluded from the basic net income (loss) per common share calculation. Our service vesting restricted stock awards do not participate in undistributed net losses and, therefore, are excluded from the basic net income (loss) per common share calculation in periods we are in a net loss position.

(2)Due to our basic net loss attributable to common shareholders for the three and nine months ended September 30, 2012, we excluded 17.1 million outstanding restricted stock awards and restricted stock units from the computations of diluted net loss per share because the effect would have been anti-dilutive. Due to our basic net loss attributable to common shareholders for the nine months ended September 30, 2011, we excluded 13.6 million outstanding restricted stock awards from the computations of pro forma diluted net loss per share because the effect would have been anti-dilutive.  For the three months

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ended September 30, 2011, we excluded 5.5 million outstanding restricted stock awards from the computations of diluted net income per share because the effect would have been anti-dilutive.

17. Contingencies

We are involved in litigation, regulatory examinations and administrative proceedings primarily arising in the ordinary course of our business in jurisdictions in which we do business. Although the outcome of these matters cannot be predicted with certainty, management believes none of these matters, either individually or in the aggregate, would have a material effect upon the Company’s financial statements.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis should be read in conjunction with our consolidated financial statements and notes thereto contained herein and our annual financial statements for the year ended December 31, 2011, included in our annual report on Form 10-K along with the section Management’s Discussion and Analysis of financial condition and Results of Operations contained in such annual report. Any terms used but not defined in the following discussion have the same meaning given to them in the annual report. Our discussion and analysis includes forward-looking information that involves risks and uncertainties and should be read in conjunction with “Risk Factors” under Item 1A of this report and in the annual report, along with “Forward-Looking Information” at the end of this section for information about the risks and uncertainties that could cause our actual results to be materially different than our forward-looking statements.

Overview

We are an independent oil and gas exploration and production company currently focused on frontier and emerging areas in Africa and South America. Our 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.

We were incorporated pursuant to the laws of Bermuda as Kosmos Energy Ltd. in January 2011 to become a holding company for Kosmos Energy Holdings. Pursuant to the terms of a corporate reorganization that was completed immediately prior to the closing of Kosmos Energy Ltd.’s IPO on May 16, 2011, all of the interests in Kosmos Energy Holdings were exchanged for newly issued common shares of Kosmos Energy Ltd. As a result, Kosmos Energy Holdings became wholly owned by Kosmos Energy Ltd.

Recent Highlights

Ghana

During the third quarter of 2012, we had two liftings of oil totaling 1,985 MBbl from our Jubilee Field production resulting in revenues of $222.4 million. Our average realized price per barrel was $112.01.

A total of 17 development wells have been drilled during the Jubilee Field Phase 1 development. The Jubilee Field Phase 1A PoD was approved by the Ministry of Energy in January 2012. Drilling for the Phase 1A PoD is underway and includes eight additional wells, including five production wells and three water injection wells.

In July 2012, the Wawa-1 exploration well made a hydrocarbon discovery on the DT Block.  Analysis of well results, including wireline logs, reservoir pressures and fluid samples, indicated the well encountered gas-condensate and oil-bearing pay. Fluid samples recovered from the well indicate an oil gravity of between 38 and 44 degrees API.

In August 2012, a drill stem test performed on the Akasa-1 well on the WCTP Block was successful in encountering oil flow.

The WCTP PA, which governs our activities related to the WCTP Block, has a duration of 30 years from its effective date (July 2004); however, in July 2011, at the end of the seven-year exploration phase, parts of the WCTP Block on which we had not declared a discovery area, were not in a development and production area or were not in the Jubilee Unit were subject to relinquishment (“WCTP Relinquishment Area”). Our existing discoveries within the WCTP Block have not been relinquished, as the WCTP PA remains in effect after the end of the exploration phase and these are Akasa, Banda, Mahogany and Teak. In addition, we have disputed the relinquishment of the area around the Cedrela prospect. In July 2011, immediately prior to Kosmos receiving the drilling rig from another operator, damage to the rig incurred during preparations to move the rig to the WCTP Block rendered the rig incapable of drilling the Cedrela-1 exploration well prior to the end of the WCTP exploration period on July 21, 2011. As a result of this unforeseen delay in the drilling of the Cedrela-1 exploration well, the Company, as Operator for the WCTP PA Block partners, delivered a Notice of Force Majeure. The Ministry of Energy and GNPC did not agree this event was Force Majeure. On August 24, 2011, we as Operator of the WCTP Block and on behalf of the WCTP PA Block partners, delivered a Notice of Dispute to the Ministry of Energy and GNPC as provided under the WCTP PA, which is the initial step in triggering the formal dispute resolution process under the WCTP PA with the Government of Ghana regarding our rights to drill the Cedrela-1 exploration well. This Notice of Dispute establishes a process for negotiation and consultation for a period of 30 days (or longer if mutually agreed) among senior representatives from the Ministry of Energy, GNPC and the WCTP Block partners to resolve the matter. The issue continues to be discussed in an effort to reach a mutually agreed upon resolution among the parties.

We and our WCTP Block partners have certain rights to negotiate a new petroleum contract with respect to the WCTP Relinquishment Area. We and our WCTP Block partners exercised such right in July 2010 and formally submitted a proposed new

27

petroleum agreement for the WCTP Relinquishment Area in early 2011. We and our WCTP Block partners, the Ministry of Energy and GNPC have agreed such WCTP PA rights extend from July 21, 2011 until such time as either a new petroleum contract is negotiated and entered into with us or we decline to match a bona fide third party offer GNPC may receive for the WCTP Relinquishment Area.

Morocco

In October 2012, the Moroccan government issued a joint ministerial order approving our acquisition of an additional 18.75% participating interest in the Foum Assaka Offshore Block from Pathfinder Hydrocarbon Ventures Ltd. (“Pathfinder”), a wholly owned subsidiary of Fastnet Oil and Gas plc (Fastnet), one of our block partners. Upon receipt of this order, we closed the acquisition of such additional participating interest with Pathfinder. We expect final governmental processes required to officially reflect the acquisition under Moroccan law to be completed in due course. After giving effect to the acquisition, our participating interest in the Foum Assaka Offshore Block is 56.25%.

In September 2012, Kosmos entered into an agreement to acquire an additional 37.5% participating interest in the Essaouira Offshore Block from Canamens Energy Morocco SARL, one of our block partners. Certain governmental approvals and processes are still required to be completed before this acquisition can be closed. After completing the acquisition, our participating interest in the Essaouira Offshore Block will be 75%.

Suriname

In May 2012, Kosmos entered into an agreement with Chevron Global Energy Inc. (“Chevron”) under which Kosmos will assign half of its interest in Block 42 and Block 45, offshore Suriname, to Chevron. Upon receipt of approval from the Suriname government and the closing of the agreement, each party will have a 50% working interest in Block 42 and Block 45.

In October 2012, we completed a 3,800 square kilometer 3D seismic data acquisition program which covered portions of Block 42 and Block 45, both in the Suriname-Guyana Basin.

Results of Operations

Certain operating results and statistics for the comparative three and nine months ended, September 30, 2012 and 2011, are included in the following table:

	Three Months EndedSeptember 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
	(In thousands, except per barrel data)
Sales volumes:
MBbl	1,985		1,994		3,913		3,979
Revenues:
Oil sales	$	222,375	$	230,262	$	450,360	$	446,914
Average sales price per Bbl	112.01		115.50		115.08		112.32
Costs:
Oil production, excluding workovers	$	16,936	$	24,185	$	33,595	$	58,481
Oil production, workovers	27,937		—		38,196		—
Total oil production costs	44,873		24,185		71,791		58,481
Depletion	61,913		41,297		123,256		85,393
Average cost per Bbl:
Oil production, excluding workovers	$	8.53	$	12.13	$	8.58	$	14.70
Oil production, workovers	14.07		—		9.76		—
Total oil production costs	22.60		12.13		18.34		14.70
Depletion	31.18		20.71		31.50		21.46
Oil production cost and depletion costs	$	53.78	$	32.84	$	49.84	$	36.16

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The following table shows the number of wells in the process of drilling or in active completion stages, and the number of wells suspended or awaiting completion as of September 30, 2012:

	Wells in the Process of Drilling or				Wells Suspended or
	in Active Completion				Awaiting Completion
	Exploration		Development		Exploration		Development
	Gross	Net	Gross	Net	Gross	Net	Gross	Net
Ghana
West Cape Three Points	—	—	—	—	8	2.47	—	—
Deepwater Tano	—	—	—	—	12	2.16	—	—
Jubilee Unit	—	—	1	0.24	—	—	4	0.96

The discussion of the results of operations and the period-to-period comparisons presented below analyze our historical results. The following discussion may not be indicative of future results.

Three months ended September 30, 2012 compared to three months ended September 30, 2011

	Three Months Ended September 30,						Increase
	2012			2011			(Decrease)
	(In thousands)
Revenues and other income:
Oil and gas revenue	$	222,375		$	230,262		$	(7,887	)
Interest income	137			2,492			(2,355		)
Other income	725			91			634
Total revenues and other income	223,237			232,845			(9,608		)
Costs and expenses:
Oil and gas production	44,873			24,185			20,688
Exploration expenses	37,359			11,005			26,354
General and administrative	40,666			39,093			1,573
Depletion and depreciation	63,794			42,593			21,201
Amortization—deferred financing costs	2,194			2,194			—
Interest expense	20,213			16,581			3,632
Derivatives, net	24,529			(4,984		)	29,513
Other expenses, net	(64		)	(79		)	15
Total costs and expenses	233,564			130,588			102,976
Income (loss) before income taxes	(10,327		)	102,257			(112,584		)
Income tax expense	25,923			50,481			(24,558		)
Net loss	$	(36,250	)	$	51,776		$	(88,026	)

Oil and gas revenue.  Oil and gas revenue decreased $7.9 million during the three months ended September 30, 2012, as compared with the three months ended September 30, 2011 due to a lower average realized price per barrel.

Oil and gas production.  Oil and gas production costs increased $20.7 million during the three months ended September 30, 2012, as compared with the three months ended September 30, 2011 primarily due to workover costs for acid stimulations on Jubilee Field wells, offset by a decrease due to the purchase of the FPSO in December 2011. For the three months ended September 30, 2012, the amortization of costs capitalized in connection with the purchase of the FPSO were expensed as depletion.  Prior to the acquisition of the FPSO, we leased the FPSO from a third party and the lease costs were included in oil and gas production costs.

Exploration expenses.  Exploration expenses increased $26.4 million during the three months ended September 30, 2012, as compared with the three months ended September 30, 2011 primarily due to an increase in seismic costs. The increase in seismic costs is primarily related to a seismic data acquisition program offshore Suriname.

Depletion and depreciation.  Depletion and depreciation increased $21.2 million during the three months ended September 30, 2012, as compared with the three months ended September 30, 2011, primarily due to an increase in the cost basis of our oil and gas properties related to the purchase of the FPSO and an increase in the number of completed wells.

Interest expense.  Interest expense increased $3.6 million during the three months ended September 30, 2012, as compared with the three months ended September 30, 2011, primarily due to an accrual for transaction taxes.

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Derivatives, net.  Derivatives, net increased $29.5 million during the three months ended September 30, 2012, as compared with the three months ended September 30, 2011, due to the change in fair value of the commodity derivative instruments during each period.

Income tax expense.  Income tax expense decreased $24.6 million during the three months ended September 30, 2012, as compared to the three months ended September 30, 2011 due to a decrease in pre-tax net income from our Ghanaian and U.S. subsidiaries.

Nine months ended September 30, 2012 compared to nine months ended September 30, 2011

	Nine Months Ended September 30,						Increase
	2012			2011			(Decrease)
	(In thousands)
Revenues and other income:
Oil and gas revenue	$	450,360		$	446,914		$	3,446
Interest income	1,165			7,459			(6,294		)
Other income	930			735			195
Total revenues and other income	452,455			455,108			(2,653		)
Costs and expenses:
Oil and gas production	71,791			58,481			13,310
Exploration expenses	93,904			104,657			(10,753		)
General and administrative	114,788			72,140			42,648
Depletion and depreciation	128,442			88,960			39,482
Amortization—deferred financing costs	6,582			13,999			(7,417		)
Interest expense	43,717			55,239			(11,522		)
Derivatives, net	26,407			5,250			21,157
Loss on extinguishment of debt	—			59,643			(59,643		)
Doubtful accounts expense	—			(39,782		)	39,782
Other expenses, net	728			(18		)	746
Total costs and expenses	486,359			418,569			67,790
Income (loss) before income taxes	(33,904		)	36,539			(70,443		)
Income tax expense	64,730			48,505			16,225
Net loss	$	(98,634	)	$	(11,966	)	$	(86,668	)

Oil and gas revenue.  Oil and gas revenue increased $3.4 million during the nine months ended September 30, 2012, as compared with the nine months ended September 30, 2011 primarily due to a higher average realized price per barrel during the nine months ended September 30, 2012.

Interest income.  Interest income decreased $6.3 million during the nine months ended September 30, 2012, as compared with the nine months ended September 30, 2011 primarily due to a decrease in interest received on notes receivable. The related note receivable was retired in December 2011 as part of the acquisition of the Jubilee FPSO. As such, the note receivable was not outstanding during 2012.

Oil and gas production.  Oil and gas production costs increased $13.3 million during the nine months ended September 30, 2012, as compared with the nine months ended September 30, 2011 primarily due to workover costs for acid stimulations on five Jubilee Field wells offset by a decrease related to the purchase of the FPSO in December 2011. During the nine months ended September 30, 2012, the amortization of costs capitalized in connection with the purchase of the FPSO were expensed as depletion.  Prior to the acquisition of the FPSO, we leased the FPSO from a third party and the lease costs were included in oil and gas production costs.

Exploration expenses.  Exploration expenses decreased $10.8 million during the nine months ended September 30, 2012, as compared with the nine months ended September 30, 2011. During the nine months ended September 30, 2012, we incurred $66.2 million for seismic costs for Morocco, Suriname, Ghana and Cameroon; $19.4 million of unsuccessful well costs, primarily related to the Ghana Teak-4A appraisal well; and $7.3 million of new business costs. During the nine months ended September 30, 2011, the Company incurred $87.8 million of unsuccessful well costs primarily related to the Cameroon N’gata-1, Cameroon Mombe-1, Ghana Makore-1, Ghana Banda-1 and Ghana Odum exploration wells; $15.9 million for seismic costs primarily for Ghana and Cameroon.

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General and administrative.  General and administrative costs increased $42.6 million during the nine months ended September 30, 2012, as compared with the nine months ended September 30, 2011, due to increases in non-cash expenses of $28.9 million for equity-based compensation and an increase in staffing. Total non-cash general and administrative costs were $58.2 million and $29.3 million for the nine months ended September 30, 2012 and 2011, respectively.

Depletion and depreciation.  Depletion and depreciation increased $39.5 million during the nine months ended September 30, 2012, as compared with the nine months ended September 30, 2011, primarily due to an increase in the cost basis of our oil and gas properties related to the purchase of the FPSO and an increase in the number of completed wells.

Amortization—deferred financing costs and Loss on extinguishment of debt.  In March 2011, we refinanced our existing commercial debt facilities. As part of the transaction, we incurred approximately $52.3 million of deferred financing costs, in addition to our existing unamortized deferred financing costs of $68.6 million. As a result of the transaction, we recorded a $59.6 million loss on the extinguishment of debt. The remaining costs were capitalized and are being amortized over the term of our commercial debt facility (“Facility”) entered into in March 2011. The related amortization of deferred financing costs decreased by $7.4 million during the nine months ended September 30, 2012, as compared to the nine months ended September 30, 2011, due to the decrease in capitalized deferred financing costs and the longer term associated with the new Facility.

Interest expense.  Interest expense decreased $11.5 million during the nine months ended September 30, 2012, as compared with the nine months ended September 30, 2011, primarily due to a decrease in the unrealized loss on the interest rate derivative instruments related to changes in fair value and a lower weighted average interest rate on the Facility, partially offset by an accrual for transaction taxes during the nine months ended September 30, 2012.

Income tax expense (benefit).  Income tax expense increased $16.2 million during the nine months ended September 30, 2012, as compared to the nine months ended September 30, 2011 due to an increase in pre-tax net income from our Ghanaian and U.S. subsidiaries.

Liquidity and Capital Resources

We are actively engaged in an ongoing process to anticipate and meet our funding requirements related to exploring for and developing oil and natural gas resources in Africa and South America. We have historically secured funding from equity commitments and commercial debt facilities to meet our ongoing liquidity requirements. In addition, we received our first oil revenues in January 2011 from Jubilee Field production and the cash flows generated from our operating activities should provide an additional source of future funding. Additionally, existing cash on hand will be utilized as a source to fund our operating and investing activities.

Significant Sources of Capital

In March 2011, the Company secured a $2.0 billion Facility from a number of financial institutions and extinguished the then existing commercial debt facilities. The Facility supports our oil and gas exploration, appraisal and development programs and corporate activities. The total loan commitments of the Facility may be increased up to a maximum of $3.0 billion if the lenders increase their commitments or if loan commitments from new financial institutions are added. In all cases, however, the availability under the Facility is limited by borrowing base capacity, which is redetermined semi-annually. The International Finance Corporation entered the Facility in February 2012. The terms and conditions of the Facility remained consistent with the original terms and conditions, and the total commitment under the Facility remained unchanged.

As of September 30, 2012, borrowings under the Facility totaled $1.0 billion. As of September 30, 2012, the undrawn availability under the Facility was an additional $160.0 million. In October 2012, as part of our normal borrowing base redetermination process, the undrawn availability under the Facility was increased $180.4 million to $340.4 million.

The interest is the aggregate of the applicable margin (3.25% to 4.75%, depending on the amount of the Facility that is being utilized and the length of time that has passed from the date the Facility was entered into); LIBOR; and mandatory cost (if any, as defined in the Facility). Interest is payable on the last day of each interest period (and, if the interest period is longer than six months, on the dates falling at six-month intervals after the first day of the interest period). Kosmos pays commitment fees on the undrawn and unavailable portion of the total commitments. Commitment fees for the lenders are equal to 40% per annum of the then-applicable respective margin when a commitment is available for utilization and, equal to 20% per annum of the then-applicable respective margin when a commitment is not available for utilization. The Company recognizes interest expense in accordance with ASC 835—Interest, which requires interest expense to be recognized using the effective interest method. We determined the effective interest rate based on the estimated level of borrowings under the Facility. Accordingly, we recognized interest expense in excess of interest currently payable of $1.2 million and $1.0 million during the three months ended September 30, 2012 and 2011, respectively, and $4.3 million and $2.2 million during the nine months ended September 30, 2012 and 2011, respectively.

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The Facility provides a revolving-credit and letter of credit facility for an availability period that expires on May 15, 2014 (in the case of the revolving-credit facility) and on the final maturity date (in the case of the letter of credit facility) of March 29, 2018. The available facility amount is subject to borrowing base constraints and also is constrained by the amortization schedule (once repayments under the Facility begin) commencing on May 15, 2014. The first required payment could be as early as June 15, 2014, subject to the level of outstanding borrowings.

Kosmos has the right to cancel all the undrawn commitments under the Facility. The amount of funds available to be borrowed under the Facility, also known as the borrowing base amount, was previously determined each year on June 15 and December 15 as part of a forecast that is prepared by and agreed to by Kosmos and the Technical and Modeling Banks. In April 2012, the lenders agreed to change the borrowing base determination dates to April 15 and October 15. The formula to calculate the borrowing base amount is based, in part, on the sum of the net present values of net cash flows and relevant capital expenditures, reduced by certain ratios.

If an event of default exists under the Facility, the lenders can accelerate the maturity and exercise other rights and remedies, including the enforcement of security granted pursuant to the Facility over certain assets held by us.

We were in compliance with the financial covenants contained in the Facility as of October 15, 2012, our most recent forecast date, which requires the maintenance of:

·the field life cover ratio, not less than 1.30x; and

·the loan life cover ratio, not less than 1.10x.

The “field life cover ratio” is broadly defined, for each applicable forecast period, as the ratio of (x) net present value of net cash flow through the depletion of the Jubilee Field plus the net present value of capital expenditures incurred in relation to the Jubilee Field and certain other fields in Ghana, to (y) the aggregate loan amounts outstanding under the Facility. The “loan life cover ratio” is broadly defined, for each applicable forecast period, as the ratio of (x) net present value of net cash flow through the final maturity date of the Facility plus the net present value of capital expenditures incurred in relation to the Jubilee Field and certain other fields in Ghana, to (y) the aggregate loan amounts outstanding under the Facility.

Capital Expenditures and Investments

We expect to incur substantial costs as we continue to develop our oil and natural gas prospects and as we:

·complete our 2012 exploration and appraisal drilling program in our license areas;

·develop our discoveries that we determine to be commercially viable;

·purchase and analyze seismic and other geological and geophysical data to identify future prospects; and

·invest in additional oil and natural gas leases and licenses and potentially make additional acquisitions.

We have relied on a number of assumptions in budgeting for our future activities. These include the number of wells we plan to drill, our working interests in our prospects, the costs involved in developing or participating in the development of a prospect, the timing of third-party projects, and the availability of suitable equipment and qualified personnel. These assumptions are inherently subject to significant business, political, economic, regulatory, environmental and competitive uncertainties, contingencies and risks, all of which are difficult to predict and many of which are beyond our control. We may need to raise additional funds more quickly if one or more of our assumptions proves to be incorrect or if we choose to expand our hydrocarbon asset acquisition, exploration, appraisal or development efforts more rapidly than we presently anticipate. We may decide to raise additional funds before we need them if the conditions for raising capital are favorable. We may seek to sell equity or debt securities or obtain additional bank credit facilities. The sale of equity securities could result in dilution to our shareholders. The incurrence of additional indebtedness could result in increased fixed obligations and additional covenants that could restrict our operations.

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2012 Capital Program

Our estimate for the 2012 capital program remains $500 million for the year ending December 31, 2012. With the success of the Company’s acid treatment program at Jubilee, we do not anticipate performing any further sidetrack operations in the current year. The 2012 capital expenditure budget consists of:

·approximately 45% for developmental related expenditures; and

·approximately 55% for exploration and appraisal related expenditures, including new ventures exploration and expanding our license portfolio (including geological and geophysical expenses).

The ultimate amount of capital we will spend may fluctuate materially based on market conditions and the success of our drilling results. Our future financial condition and liquidity will be impacted by, among other factors, our level of production of oil and natural gas and the prices we receive from the sale of these commodities, the success of our exploration and appraisal drilling program, the number of commercially viable oil and natural gas discoveries made and the quantities of oil and natural gas discovered, the speed with which we can bring such discoveries to production, and the actual cost of exploration, appraisal and development of our oil and natural gas assets.

The following table presents our liquidity and financial position as of September 30, 2012:

	September 30,2012
	(In thousands)
Cash	$	399,650
Drawings under the commercial debt facility	1,000,000
Net debt	600,350
Total of unused borrowing base(1)	160,000
Unused borrowing base plus cash(1)	559,650

(1)In October 2012, as part of the borrowing base determination process, the undrawn availability under the Facility was increased $180.4 million to $340.4 million.

Cash Flows

	Nine Months Ended September 30,
	2012			2011
	(In thousands)
Net cash provided by (used in):
Operating activities	$	150,110		$	267,146
Investing activities	(304,800		)	(194,027		)
Financing activities	(118,752		)	482,908

Operating activities.  Net cash provided by operating activities for the nine months ended September 30, 2012 was $150.1 million, compared with net cash provided by operating activities for the nine months ended September 30, 2011 of $267.1 million. The decrease in cash provided by operating activities in the nine months ended September 30, 2012 compared with the same period in 2011 was primarily due to timing of cash receipts for oil sales, workover costs for acid stimulations and other working capital changes.

Investing activities.  Net cash used in investing activities for the nine months ended September 30, 2012 was $304.8 million, compared with net cash used in investing activities for the nine months ended September 30, 2011 of $194.0 million. The increase in cash used in investing activities in the nine months ended September 30, 2012 compared with the same period in 2011 was primarily attributable to changes in restricted cash, notes receivable and expenditures for oil and gas assets primarily in Ghana for development activities. During the nine months ended September 30, 2012, we set aside $23.1 million of restricted cash to support our exploration related activities. During the nine months ended September 30, 2011, we released $112.0 million of associated restricted cash and set aside $26.4 million primarily related to requirements under the Facility.

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Financing activities.  Net cash used in financing activities for the nine months ended September 30, 2012 was $118.8 million, compared with net cash provided by financing activities for the nine months ended September 30, 2011 of $482.9 million. The decrease in cash provided by financing activities in the nine months ended September 30, 2012 compared with the same period in 2011 was primarily due net to proceeds received from the IPO of $580.4 million received in 2011.

Contractual Obligations

The following table summarizes by period the payments due for our estimated contractual obligations as of September 30, 2012:

	Payments Due By Year(3)
	Total		2012(4)		2013		2014		2015		2016		Thereafter
	(In thousands)
Commercial debt facility(1)	$	1,000,000	$	—	$	—	$	—	$	—	$	444,444	$	555,556
Interest payments on commercial debt facility(2)	226,440		10,797		43,003		44,916		45,087		52,342		30,295
Deferred premiums on oil derivative contracts	11,142		2,941		7,598		603		—		—		—
Operating leases	21,797		234		2,821		2,921		3,022		3,122		9,677

(1)The amounts included in the table represent principal maturities only. The scheduled maturities of debt are based on the level of borrowings and the available borrowing base as of September 30, 2012. Any increases or decreases in the level of borrowings or decreases in the available borrowing base would impact the scheduled maturities of debt during the next five years and thereafter.

(2)Based on outstanding borrowings as noted in (1) above and the LIBOR yield curve at the reporting date.

(3)Does not include purchase commitments for jointly owned fields and facilities where we are not the operator and excludes
$12.2 million of commitments for exploration activities in our petroleum contracts. Does not include any well commitments we may have under our petroleum contracts.

(4)Represents payments for the period October 1, 2012 through December 31, 2012.

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The following table presents maturities by expected maturity dates under the Facility, the weighted average interest rates expected to be paid on the Facility given current contractual terms and market conditions, and the debt’s estimated fair value. Weighted-average interest rates are based on implied forward rates in the yield curve at the reporting date. This table does not take into account amortization of deferred financing costs.

	Year Ending December 31,
	October 1 Through December 31, 2012			2013			2014			2015			2016			Thereafter			Liability Fair Value at September 30, 2012
	(In thousands, except percentages)
Variable rate debt:
Commercial debt facility maturities	$	—		$	—		$	—		$	—		$	444,444		$	555,556		$	(1,000,000	)
Weighted average interest rate	4.28		%	4.30		%	4.49		%	4.51		%	5.89		%	6.62		%
Interest rate swaps:
Notional debt amount(1)	$	114,896		$	91,683		$	47,033		$	16,875		$	6,250		$	—		$	(3,388	)
Fixed rate payable	2.22		%	2.22		%	2.22		%	2.22		%	2.22		%
Variable rate receivable(2)	0.73		%	0.53		%	0.54		%	0.73		%	1.12		%
Notional debt amount(1)	$	114,896		$	91,683		$	47,033		$	16,875		$	6,250		$	—		$	(3,596	)
Fixed rate payable	2.31		%	2.31		%	2.31		%	2.31		%	2.31		%
Variable rate receivable(2)	0.73		%	0.53		%	0.54		%	0.73		%	1.12		%
Notional debt amount(1)(3)	$	49,751		$	19,057		$	1,868		$	—		$	—		$	—		$	(151	)
Fixed rate payable	0.98		%	0.98		%	0.98		%
Variable rate receivable(2)	0.73		%	0.53		%	0.52		%
Notional debt amount(1)(4)	$	26,877		$	24,680		$	38,434		$	23,137		$	—		$	—		$	(660	)
Fixed rate payable	1.34		%	1.34		%	1.34		%	1.34		%
Variable rate receivable(2)	0.73		%	0.53		%	0.54		%	0.66		%

(1)Represents weighted average notional contract amounts of interest rate derivatives.

(2)Based on implied forward rates in the yield curve at the reporting date.

(3)For 2014, represents notional amount from January — June 2014.

(4)For 2015, represents notional amount from January — June 2015.

Off-Balance Sheet Arrangements

As of September 30, 2012, we did not have any material off-balance sheet arrangements.

Critical Accounting Policies

We consider accounting policies related to our revenue recognition, exploration and development costs, receivables, income taxes, derivatives and hedging activities, estimates of proved oil and natural gas reserves, asset retirement obligations and impairment of long-lived assets as critical accounting policies. The policies include significant estimates made by management using information available at the time the estimates are made. However, these estimates could change materially if different information or assumptions were used. Other than as described below, these policies are summarized in “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations section in our annual report on Form 10-K, for the year ended December 31, 2011.

Revenue Recognition

We use the sales method of accounting for oil and gas revenues. Under this method, we recognize revenues on the volumes sold based on 100% of the provisional sales prices. The volumes sold may be more or less than the volumes to which we are entitled based on our ownership interest in the property. These differences result in a condition known in the industry as a production

35

imbalance. A receivable or liability is recognized only to the extent that we have an imbalance on a specific property greater than the expected remaining proved reserves on such property. As of September 30, 2012 and December 31, 2011, we had no oil and gas imbalances recorded in our consolidated financial statements.

Our oil and gas revenues are based on provisional price contracts which contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from oil sales at the spot price on the date of sale. The embedded derivative, which is not designated as a hedge, is marked to market through oil and gas revenue each period until the final settlement occurs, which generally is limited to the month after the sale occurs.

Cautionary Note Regarding Forward-looking Statements

This quarterly report on Form 10-Q contains estimates and forward-looking statements, principally in “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” Our estimates and forward-looking statements are mainly based on our current expectations and estimates of future events and trends, which affect or may affect our businesses and operations. Although we believe 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 us. Many important factors, in addition to the factors described in our quarterly report on Form 10-Q and our annual report on Form 10-K, may adversely affect our results as indicated in forward-looking statements. You should read this quarterly report on Form 10-Q, the annual report on Form 10-K and the documents that we have filed with the Securities and Exchange Commission completely and with the understanding that our actual future results may be materially different from what we expect. Our estimates and forward-looking statements may be influenced by the following factors, among others:

·our ability to find, acquire or gain access to other discoveries and prospects and to successfully develop our current discoveries and prospects;

·uncertainties inherent in making estimates of our oil and natural gas data;

·the successful implementation of our and our block partners’ prospect discovery and development and drilling plans;

·projected and targeted capital expenditures and other costs, commitments and revenues;

·termination of or intervention in concessions, rights or authorizations granted by the governments of Ghana, Cameroon, Mauritania, Morocco or Suriname (or their respective national oil companies) or any other federal, state or local governments, to us;

·our dependence on our key management personnel and our ability to attract and retain qualified technical personnel;

·the ability to obtain financing and to comply with the terms under which such financing may be available;

·the volatility of oil and natural gas prices;

·the availability, cost, function and reliability of developing appropriate infrastructure around and transportation to our discoveries and prospects;

·the availability and cost of drilling rigs, production equipment, supplies, personnel and oilfield services;

·other competitive pressures;

·potential liabilities inherent in oil and natural gas operations, including drilling risks and other operational and environmental hazards;

·current and future government regulation of the oil and gas industry;

·cost of compliance, and our and our partners ability to comply, with laws and regulations;

·changes in environmental, health and safety or climate change laws, greenhouse gas regulation or the implementation, or interpretation, of those laws and regulations;

·environmental liabilities;

·geological, reservoir, technical, drilling, production and processing problems;

36

·military operations, civil unrest, terrorist acts, wars or embargoes;

·the cost and availability of adequate insurance coverage;

·our vulnerability to severe weather events; and

·other risk factors discussed in the “Item 1A. Risk Factors” section of this quarterly report on Form 10-Q and our annual report on Form 10-K.

The words “believe,” “may,” “will,” “aim,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “plan” and similar words are intended to identify estimates and forward-looking statements. Estimates and forward-looking statements speak only as of the date they were made, and, except to the extent required by law, we undertake no obligation to update or to review any estimate and/or forward-looking statement because of new information, future events or other factors. Estimates and forward-looking statements involve risks and uncertainties and are not guarantees of future performance. As a result of the risks and uncertainties described above, the estimates and forward-looking statements discussed in this Quarterly Report on Form 10-Q might not occur and our future results and our performance may differ materially from those expressed in these forward-looking statements due to, including, but not limited to, the factors mentioned above. Because of these uncertainties, you should not place undue reliance on these forward-looking statements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

The primary objective of the following information is to provide forward-looking quantitative and qualitative information about our potential exposure to market risks. The term “market risks” as it relates to our currently anticipated transactions refers to the risk of loss arising from changes in commodity prices and interest rates. These disclosures are not meant to be precise indicators of expected future losses, but rather they are indicators of reasonably possible losses. This forward-looking information provides indicators of how we view and manage ongoing market risk exposures. We enter into market-risk sensitive instruments for purposes other than speculation.

The following table reconciles the changes that occurred in fair values of our open derivative contracts during the nine months ending September 30, 2012:

	Derivative Contracts Assets (Liabilities)
	Commodities			Interest Rates			Total
	(In thousands)
Fair value of contracts outstanding as of December 31, 2011	$	(24,760	)	$	(8,074	)	$	(32,834	)
Changes in contract fair value	(11,186		)	(2,366		)	(13,552		)
Contract maturities (settlements)	16,110			2,645			18,755
Fair value of contracts outstanding as of September 30, 2012	$	(19,836	)	$	(7,795	)	$	(27,631	)

Commodity Derivative Instruments

We enter into various oil derivative contracts to mitigate our exposure to commodity price risk associated with anticipated future oil production. These contracts currently consist of purchased puts, swaps with calls and three-way collars.

We manage market and counterparty credit risk in accordance with our policies and guidelines. In accordance with these policies and guidelines, we determine the appropriate timing and extent of derivative transactions. We attempt to minimize credit risk exposure to counterparties through formal credit policies, monitoring procedures and diversification. See Note 10—Derivative Financial Instruments in our notes to consolidated financial statements for a description of the accounting procedures we follow relative to our derivative financial instruments.

37

Commodity Price Sensitivity

The following table provides information about our oil derivative financial instruments that were sensitive to changes in oil prices as of September 30, 2012:

			Weighted Average Price per Bbl										Liability Fair Value at
Term	Type of Contract	MBbl	Deferred Premium		Swaps		Floor		Ceiling		Calls		September 30,2012(1)(2)
2012:
October - December	Purchased puts	426	$	6.86	$	—	$	61.48	$	—	$	—	$	2,821
October - December	Swaps with calls	600	—		97.21		—		—		110.00		5,687
2013(3):
January - December	Three-way collars	1,500	$	4.82	$	—	$	95.00	$	105.00	$	125.00	$	10,117
January - December	Three-way collars	1,004	—		—		87.50		115.00		135.00		850

(1)Fair values are based on the average forward Dated Brent oil prices on September 30, 2012 which are: October 1 through December 31, 2012 - $111.83; and 2013 - $107.53. These fair values are subject to changes in the forward curve of the underlying commodity price. The average forward Dated Brent oil prices based on October 31, 2012 market quotes are: November 1 through December 31, 2012 - $108.45 and 2013 - $104.30.

(2)Excludes $3.5 million of cash settlements made on our purchased puts and swaps with calls which were settled in the month subsequent to period end.

(3)In October 2012, we entered into costless three-way collar contracts for 1.0 MMBbl from January 2013 through December 2013 with a floor price of $90.00 per Bbl, a weighted average ceiling price of $115.39 per Bbl and a call price of $135.00 per Bbl. The three-way collar contracts are indexed to Dated Brent prices.

As of September 30, 2012, we had sales volumes of 995 MBbl priced at an average of $110.28 per Bbl, after differentials, which are subject to final pricing over the next month. The value attributable to the provisional oil sales derivative is based on (i) the sales volumes subject to provisional pricing and (ii) an independently sourced forward curve over the term of the provisional pricing period.

Interest Rate Sensitivity

At September 30, 2012, we had indebtedness outstanding under our Facility of $1.0 billion, of which $693.6 million bore interest at floating rates. The weighted average annual interest rate incurred on this indebtedness for the nine months ended September 30, 2012, was approximately 4.1%. If LIBOR increased 10% at this level of floating rate debt, we would pay an additional $0.2 million in interest expense per year on our Facility.

As of September 30, 2012, the fair market value of our interest rate swaps was a net liability of approximately $7.8 million. If LIBOR increased 10%, we estimate the liability would decrease to approximately $7.5 million, and if LIBOR decreased 10%, we estimate the liability would increase to approximately $8.1 million.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures.  As of the end of the period covered by this report, an evaluation of the effectiveness of the design and operation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) was performed under the supervision and with the participation of the Company’s management, including our Chief Executive Officer and Chief Financial Officer. Based on that evaluation, the Company’s Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were effective as of September 30, 2012.

Evaluation of Changes in Internal Control over Financial Reporting.  There were no changes in our internal controls over financial reporting during our most recent fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting. We have begun the process of documenting, reviewing and, as appropriate, improving our internal controls and procedures in anticipation of becoming subject to the SEC rules concerning internal control over financial reporting, which take effect beginning with the filing of our second annual report on Form 10-K due in March 2013.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

There have been no material changes from the information concerning legal proceedings discussed in the “Item 3. Legal Proceedings” section of our annual report on Form 10-K.

Item 1A. Risk Factors

There have been no material changes from the risk factors disclosed in “Item 1A. Risk Factors” section of our annual report on Form 10-K and “Item 1A. Risk Factors” section of our quarterly report on Form 10-Q for the quarter ended June 30, 2012.

Item 2.    Unregistered Sales of Equity Securities and Use of Proceeds

There have been no material changes from the information concerning the use of proceeds from our IPO discussed in the “Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities” section of our annual report on Form 10-K.

Item 3.    Defaults Upon Senior Securities

None.

Item 4.    Mine Safety Disclosures

Not applicable.

Item 5.    Other Information.

There have been no material changes required to be reported under this Item that have not previously been disclosed in the annual report on Form 10-K.

Item 6. Exhibits

The information required by this Item 6 is set forth in the Index to Exhibits accompanying this quarterly report on Form 10-Q.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereto duly authorized.

		Kosmos Energy Ltd.
		(Registrant)
Date	November 5, 2012	/s/ W. GREG DUNLEVY
		W. Greg Dunlevy
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)

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INDEX TO EXHIBITS

Exhibit Number		Description of Document
10.1†		Form of RSU Award Agreement (Directors — Service Vesting)
10.2†		Form of RSU Award Agreement (Employees — Service Vesting)
10.3†		Form of RSU Award Agreement (Employees — Performance Vesting)
31.1*		Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*		Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	*	Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2*	*	Certification of Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*		XBRL Instance Document
101.SCH*		XBRL Taxonomy Extension Schema Document
101.CAL*		XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB*		XBRL Taxonomy Extension Label Linkbase Document
101.PRE*		XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF*		XBRL Taxonomy Extension Definition Linkbase Document

*Filed herewith.

**Furnished herewith.

†Management contract or compensatory plan or arrangement.

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EX-10.1

Exhibit 10.1

 KOSMOS ENERGY LTD.

LONG TERM INCENTIVE PLAN

RSU Award Agreement

[Service Vesting – for Directors]

You have been granted a restricted share unit award (this “Award”) on the following terms and subject to the provisions of Attachment A and the Kosmos Energy Ltd. Long Term Incentive Plan (the “Plan”).  Unless defined in this Award agreement (including Attachment A, this “Agreement”), capitalized terms will have the meanings assigned to them in the Plan.  In the event of a conflict among the provisions of the Plan, this Agreement and any descriptive materials provided to you, the provisions of the Plan will prevail.

Participant	[Full name]
Number of Restricted Share Units	[·] Restricted Share Units (the “RSUs” or “Restricted Share Units”)
Grant Date	[Insert date]
Vesting	Subject to Section 3 of Attachment A, one-fourth of the RSUs shall vest on [insert applicable vesting portion] if the Participant does not experience a Termination of Service at any time prior to the applicable vesting date. Further, subject to Section 3 of Attachment A, if a Change in Control occurs and the Participant does not experience a Termination of Service from the Grant Date to [insert date], then the RSUs that have not vested pursuant to the preceding sentence shall fully vest on such [insert date].

Attachment A

RSU Award Agreement

Terms and Conditions

Grant to:  [Full name]

Section 1.  Grant of RSU Award.  Subject to the terms and conditions of the Plan and this Agreement, the Company hereby grants this Award to the Participant on the Grant Date on the terms set forth on the cover page of this Agreement, as more fully described in this Attachment A.  This Award is granted under the Plan, which is incorporated herein by this reference and made a part of this Agreement.

Section 2.  Issuance of RSUs.

(a)           Issuance.  Each RSU shall represent the right to receive one Share upon the vesting of such RSU in accordance with this Agreement.

(b)           Voting Rights.  The Participant shall have no voting rights with respect to the RSUs unless and until the Participant becomes the record owner of the Shares, including Dividend Shares (as defined below) to the extent applicable, underlying such RSUs.

(c)           Dividend Equivalents.  If a dividend is paid on Shares during the period commencing on the Grant Date and ending on the date on which the Shares underlying RSUs are distributed to the Participant, the Participant shall be eligible to receive an amount equal to the amount of the dividend that the Participant would have received had the Shares underlying the RSUs been distributed to the Participant as of the time at which such dividend is paid; it being understood that no such amount shall be payable with respect to any RSUs that are forfeited.  Such amount shall be paid to the Participant on the date on which the Shares underlying the RSUs are distributed to the Participant in the same form (cash, Shares or other property) in which such dividend is paid to holders of Shares generally.  Any Shares that the Participant is eligible to receive pursuant to this Section 2 are referred to herein as “Dividend Shares.”

(d)           Transferability.  The RSUs shall not be assigned, sold, transferred or otherwise be subject to alienation by the Participant.  Any assignment, sale, transfer or other alienation with respect to the Shares issuable upon the vesting of the RSUs shall be in accordance with applicable securities laws.

(e)           Withholding Requirements.  The Company may withhold any tax (or other governmental obligation) that becomes due with respect to the RSUs (or any dividend or distribution thereon), and the Participant shall make arrangements satisfactory to the Company to enable the Company to satisfy all such withholding requirements. Notwithstanding the foregoing, the Committee, in its

2

sole discretion, may permit the Participant to satisfy any such withholding requirement by transferring to the Company pursuant to such procedures as the Committee may require, effective as of the date on which such requirement arises, a number of vested Shares owned and designated by the Participant having an aggregate Fair Market Value as of such date that is equal to the minimum amount required to be withheld.  If the Committee permits the Participant to satisfy any such withholding requirement pursuant to the preceding sentence, the Company shall remit to the Internal Revenue Service and appropriate state and local revenue agencies, for the credit of the Participant, an amount of cash withholding equal to the Fair Market Value of the Shares transferred to the Company as provided above.

Section 3.  Accelerated Vesting, Forfeiture upon Termination of Service and Distribution.

(a)           Death or Disability.  In the event of the Participant’s Termination of Service at any time due to the Participant’s death or Disability, the RSUs shall fully vest.

(b)           For Cause.  In the event of the Participant’s Termination of Service at any time for cause (as defined in the Company’s Bye-Laws, as may be amended from time to time), any unvested RSUs shall be forfeited in their entirety without any payment to the Participant or, in the Committee’s sole discretion, if required pursuant to applicable law to effect such forfeiture, the Company may repurchase the RSUs at their par value.

(c)           For Any Other Reason.  In the event of the Participant’s Termination of Service at any time under circumstances not described in Sections 3(a) or 3(b), (i) the portion of the RSUs that is scheduled to vest on the next applicable vesting date shall vest on the date of such Termination of Service and (ii) the portion of the RSUs that is not scheduled to vest in accordance with clause (i) shall be forfeited in its entirety without any payment to the Participant or, in the Committee’s sole discretion, if required pursuant to applicable law to effect such forfeiture, the Company may repurchase the RSUs at their par value.

(d)           Distribution on Vesting.  Subject to the provisions of this Agreement, upon the vesting of any of the RSUs, the Company shall distribute to the Participant, on or within 30 days after the date of such vesting, one Share for each such RSU and the number of Dividend Shares determined in accordance with Section 2(c) of this Attachment A.  Subject to any applicable Lock Up Agreement, on such distribution, such Shares (including Dividend Shares) shall be fully assignable, saleable and transferable by the Participant, and the Company shall deliver such Shares to the Participant by transfer or issuance to the Depository Trust Company for the benefit of the Participant or by delivery of a share certificate registered in the Participant’s name and such transfer or issuance shall be evidenced in the register of members of the Company.

3

Section 4.  Miscellaneous Provisions.

(a)           Notices.  All notices, requests and other communications under this Agreement shall be in writing and shall be delivered in person (by courier or otherwise), mailed by certified or registered mail, return receipt requested, or sent by facsimile transmission, as follows:

if to the Company, to:

Kosmos Energy Ltd.

c/o Kosmos Energy, LLC

8176 Park Lane, Suite 500

Dallas, Texas 75231

Attention:  [·]

if to the Participant, to the address that the Participant most recently provided to the Company,

or to such other address or facsimile number as such party may hereafter specify for the purpose by notice to the other parties hereto.  All such notices, requests and other communications shall be deemed received on the date of receipt by the recipient thereof if received prior to 5:00 p.m. on a business day in the place of receipt.  Otherwise, any such notice, request or communication shall be deemed received on the next succeeding business day in the place of receipt.

(b)           Entire Agreement.  This Agreement, the Plan and any other agreements, schedules, exhibits and other documents referred to herein or therein constitute the entire agreement and understanding between the parties in respect of the subject matter hereof and supersede all prior and contemporaneous arrangements, agreements and understandings, both oral and written, whether in term sheets, presentations or otherwise, between the parties with respect to the subject matter hereof.

(c)           Amendment; Waiver.  No amendment or modification of any provision of this Agreement shall be effective unless signed in writing by or on behalf of the Company and the Participant, except that the Company may amend or modify this Agreement without the Participant’s consent in accordance with the provisions of the Plan or as otherwise set forth in this Agreement.  No waiver of any breach or condition of this Agreement shall be deemed to be a waiver of any other or subsequent breach or condition whether of like or different nature.  Any amendment or modification of or to any provision of this Agreement, or any waiver of any provision of this Agreement, shall be effective only in the specific instance and for the specific purpose for which made or given.

4

(d)           Assignment.  Neither this Agreement nor any right, remedy, obligation or liability arising hereunder or by reason hereof shall be assignable by the Participant.

(e)           Successors and Assigns; No Third Party Beneficiaries.  This Agreement shall inure to the benefit of and be binding upon the Company and the Participant and their respective heirs, successors, legal representatives and permitted assigns.  Nothing in this Agreement, expressed or implied, is intended to confer on any Person other than the Company and the Participant, and their respective heirs, successors, legal representatives and permitted assigns, any rights, remedies, obligations or liabilities under or by reason of this Agreement.

(f)            Counterparts.  This Agreement may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

(g)           Participant Undertaking.  The Participant agrees to take whatever additional action and execute whatever additional documents the Company may deem necessary or advisable to carry out or give effect to any of the obligations or restrictions imposed on either the Participant or the RSUs pursuant to the provisions of this Agreement.

(h)           Plan.  The Participant acknowledges and understands that material definitions and provisions concerning the RSUs and the Participant’s rights and obligations with respect thereto are set forth in the Plan.  The Participant has read carefully, and understands, the provisions of the Plan.

(i)            Dispute Resolution.  If any dispute arising out of or relating to this Agreement or the Plan, or the breach thereof, cannot be settled through negotiation, the parties agree first to try in good faith to settle such dispute by mediation administered by the American Arbitration Association under its Commercial Mediation Rules.  If the parties fail to settle such dispute within 30 days after the commencement of such mediation, such dispute shall be settled by arbitration administered by the American Arbitration Association under its Commercial Arbitration Rules, and judgment on the arbitral award rendered may be entered in any court having jurisdiction thereof.

5

IN WITNESS WHEREOF, the parties have executed this Agreement as of the day and year first written above.

KOSMOS ENERGY LTD.
By:
	Name:
	Title:
	[Name of Participant]

6

EX-10.2

Exhibit 10.2

 KOSMOS ENERGY LTD.

LONG TERM INCENTIVE PLAN

RSU Award Agreement

[Service Vesting]

You have been granted a restricted share unit award (this “Award”) on the following terms and subject to the provisions of Attachment A and the Kosmos Energy Ltd. Long Term Incentive Plan (the “Plan”).  Unless defined in this Award agreement (including Attachment A, this “Agreement”), capitalized terms will have the meanings assigned to them in the Plan.  In the event of a conflict among the provisions of the Plan, this Agreement and any descriptive materials provided to you, the provisions of the Plan will prevail.

Participant	[Full name]
Number of Restricted Share Units	[·] Restricted Share Units (the “RSUs” or “Restricted Share Units”)
Grant Date	[Insert date]
Vesting	Subject to Section 3 of Attachment A, one-fourth of the RSUs shall vest on [insert applicable vesting portion] if the Participant does not experience a Termination of Service at any time prior to the applicable vesting date. Further, subject to Section 3 of Attachment A, if a Change in Control occurs and the Participant does not experience a Termination of Service from [insert date] to the first anniversary of the date of such Change in Control, then the RSUs that have not vested pursuant to the preceding sentence shall fully vest on [insert date].

Attachment A

RSU Award Agreement

Terms and Conditions

Grant to:  [Full name]

Section 1.  Grant of RSU Award.  Subject to the terms and conditions of the Plan and this Agreement, the Company hereby grants this Award to the Participant on the Grant Date on the terms set forth on the cover page of this Agreement, as more fully described in this Attachment A.  This Award is granted under the Plan, which is incorporated herein by this reference and made a part of this Agreement.

Section 2.  Issuance of RSUs.

(a)           Issuance.  Each RSU shall represent the right to receive one Share upon the vesting of such RSU in accordance with this Agreement.

(b)           Voting Rights.  The Participant shall have no voting rights with respect to the RSUs unless and until the Participant becomes the record owner of the Shares, including Dividend Shares (as defined below) to the extent applicable, underlying such RSUs.

(c)           Dividend Equivalents.  If a dividend is paid on Shares during the period commencing on [insert date] and ending on the date on which the Shares underlying RSUs are distributed to the Participant, the Participant shall be eligible to receive an amount equal to the amount of the dividend that the Participant would have received had the Shares underlying the RSUs been distributed to the Participant as of the time at which such dividend is paid; it being understood that no such amount shall be payable with respect to any RSUs that are forfeited.  Such amount shall be paid to the Participant on the date on which the Shares underlying the RSUs are distributed to the Participant in the same form (cash, Shares or other property) in which such dividend is paid to holders of Shares generally.  Any Shares that the Participant is eligible to receive pursuant to this Section 2 are referred to herein as “Dividend Shares.”

(d)           Transferability.  The RSUs shall not be assigned, sold, transferred or otherwise be subject to alienation by the Participant.  Any assignment, sale, transfer or other alienation with respect to the Shares issuable upon the vesting of the RSUs shall be in accordance with applicable securities laws.

(e)           Withholding Requirements.  The Company may withhold any tax (or other governmental obligation) that becomes due with respect to the RSUs (or any dividend or distribution thereon), and the Participant shall make arrangements satisfactory to the Company to enable the Company to satisfy all such withholding requirements. Notwithstanding the foregoing, the Committee, in its

2

sole discretion, may permit the Participant to satisfy any such withholding requirement by transferring to the Company pursuant to such procedures as the Committee may require, effective as of the date on which such requirement arises, a number of vested Shares owned and designated by the Participant having an aggregate Fair Market Value as of such date that is equal to the minimum amount required to be withheld.  If the Committee permits the Participant to satisfy any such withholding requirement pursuant to the preceding sentence, the Company shall remit to the Internal Revenue Service and appropriate state and local revenue agencies, for the credit of the Participant, an amount of cash withholding equal to the Fair Market Value of the Shares transferred to the Company as provided above.

Section 3.  Accelerated Vesting, Forfeiture upon Termination of Service and Distribution.

[[For employees with a title of Senior Vice President or above:] (a)  Death, Disability, without Cause or for Good Reason.  In the event of the Participant’s Termination of Service at any time due to the Participant’s death or Disability, by the Company or any Affiliate without Cause or by the Participant for Good Reason, the RSUs shall fully vest.]

[[For all other employees:] (a)  Death or Disability; without Cause or for Good Reason within One Year After a Change in Control.  In the event of the Participant’s Termination of Service (x) at any time due to the Participant’s death or Disability or (y) on the date upon which a Change in Control occurs or within one year thereafter by the Company or any Affiliate without Cause or by the Participant for Good Reason, then, in any such case, the RSUs shall fully vest.]

(b)           For Any Other Reason.  In the event of the Participant’s Termination of Service at any time under circumstances not described in Section 3(a), the RSUs shall be forfeited in their entirety without any payment to the Participant or, in the Committee’s sole discretion, if required pursuant to applicable law to effect such forfeiture, the Company may repurchase the RSUs at their par value.

(c)           Distribution on Vesting.  Subject to the provisions of this Agreement, upon the vesting of any of the RSUs, the Company shall distribute to the Participant, on or within 30 days after the date of such vesting, one Share for each such RSU and the number of Dividend Shares determined in accordance with Section 2(c) of this Attachment A.  Subject to any applicable Lock Up Agreement, on such distribution, such Shares (including Dividend Shares) shall be fully assignable, saleable and transferable by the Participant, and the Company shall deliver such Shares to the Participant by transfer or issuance to the Depository Trust Company for the benefit of the Participant or by delivery of a share certificate registered in the Participant’s name and such transfer or issuance shall be evidenced in the register of members of the Company.

3

Section 4.  Miscellaneous Provisions.

(a)           Notices.  All notices, requests and other communications under this Agreement shall be in writing and shall be delivered in person (by courier or otherwise), mailed by certified or registered mail, return receipt requested, or sent by facsimile transmission, as follows:

if to the Company, to:

Kosmos Energy Ltd.

c/o Kosmos Energy, LLC

8176 Park Lane, Suite 500

Dallas, Texas 75231

Attention:  [·]

if to the Participant, to the address that the Participant most recently provided to the Company,

or to such other address or facsimile number as such party may hereafter specify for the purpose by notice to the other parties hereto.  All such notices, requests and other communications shall be deemed received on the date of receipt by the recipient thereof if received prior to 5:00 p.m. on a business day in the place of receipt.  Otherwise, any such notice, request or communication shall be deemed received on the next succeeding business day in the place of receipt.

(b)           Entire Agreement.  This Agreement, the Plan and any other agreements, schedules, exhibits and other documents referred to herein or therein constitute the entire agreement and understanding between the parties in respect of the subject matter hereof and supersede all prior and contemporaneous arrangements, agreements and understandings, both oral and written, whether in term sheets, presentations or otherwise, between the parties with respect to the subject matter hereof.

(c)           Amendment; Waiver.  No amendment or modification of any provision of this Agreement shall be effective unless signed in writing by or on behalf of the Company and the Participant, except that the Company may amend or modify this Agreement without the Participant’s consent in accordance with the provisions of the Plan or as otherwise set forth in this Agreement.  No waiver of any breach or condition of this Agreement shall be deemed to be a waiver of any other or subsequent breach or condition whether of like or different nature.  Any amendment or modification of or to any provision of this Agreement, or any waiver of any provision of this Agreement, shall be effective only in the specific instance and for the specific purpose for which made or given.

4

(d)           Assignment.  Neither this Agreement nor any right, remedy, obligation or liability arising hereunder or by reason hereof shall be assignable by the Participant.

(e)           Successors and Assigns; No Third Party Beneficiaries.  This Agreement shall inure to the benefit of and be binding upon the Company and the Participant and their respective heirs, successors, legal representatives and permitted assigns.  Nothing in this Agreement, expressed or implied, is intended to confer on any Person other than the Company and the Participant, and their respective heirs, successors, legal representatives and permitted assigns, any rights, remedies, obligations or liabilities under or by reason of this Agreement.

(f)            Counterparts.  This Agreement may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

(g)           Participant Undertaking.  The Participant agrees to take whatever additional action and execute whatever additional documents the Company may deem necessary or advisable to carry out or give effect to any of the obligations or restrictions imposed on either the Participant or the RSUs pursuant to the provisions of this Agreement.

(h)           Plan.  The Participant acknowledges and understands that material definitions and provisions concerning the RSUs and the Participant’s rights and obligations with respect thereto are set forth in the Plan.  The Participant has read carefully, and understands, the provisions of the Plan.

(i)            Dispute Resolution.  If any dispute arising out of or relating to this Agreement or the Plan, or the breach thereof, cannot be settled through negotiation, the parties agree first to try in good faith to settle such dispute by mediation administered by the American Arbitration Association under its Commercial Mediation Rules.  If the parties fail to settle such dispute within 30 days after the commencement of such mediation, such dispute shall be settled by arbitration administered by the American Arbitration Association under its Commercial Arbitration Rules, and judgment on the arbitral award rendered may be entered in any court having jurisdiction thereof.

5

IN WITNESS WHEREOF, the parties have executed this Agreement as of the day and year first written above.

KOSMOS ENERGY LTD.
By:
	Name:
	Title:
	[Name of Participant]

6

EX-10.3

Exhibit 10.3

KOSMOS ENERGY LTD.

LONG TERM INCENTIVE PLAN

RSU Award Agreement

[Performance Vesting]

You have been granted a restricted share unit award (this “Award”) on the following terms and subject to the provisions of Attachments A and B and the Kosmos Energy Ltd. Long Term Incentive Plan (the “Plan”).  Unless defined in this Award agreement (including Attachments A and B, this “Agreement”), capitalized terms will have the meanings assigned to them in the Plan.  In the event of a conflict among the provisions of the Plan, this Agreement and any descriptive materials provided to you, the provisions of the Plan will prevail.

Participant	[Full name]
Number of Restricted Share Units	[·] Restricted Share Units (the “RSUs” or “Restricted Share Units”), if 100% of the Performance Condition (as defined below) is satisfied (the “Target RSUs”)
Grant Date	[Insert date]
Vesting	Subject to Section 3 of Attachment A, the RSUs shall vest to the extent that both the applicable “Service Condition” and the applicable “Performance Condition” (as such terms are defined below) with respect to such RSUs are satisfied.
Service Condition	Subject to Section 3 of Attachment A, the “Service Condition” shall be satisfied with respect to [insert applicable vesting portion and vesting schedule], in each case if the Participant does not experience a Termination of Service at any time prior to the applicable vesting date.
Performance Condition	Subject to Section 3 of Attachment A, the “Performance Condition” shall be deemed satisfied with respect to between [·]% and [·]% of the RSUs based on attainment of Relative TSR as of [insert date], as detailed in Attachment B.

Attachment A

RSU Award Agreement

Terms and Conditions

Grant to:  [Full name]

Section 1.  Grant of RSU Award.  Subject to the terms and conditions of the Plan and this Agreement, the Company hereby grants this Award to the Participant on the Grant Date on the terms set forth on the cover page of this Agreement, as more fully described in this Attachment A and in Attachment B.  This Award is granted under the Plan, which is incorporated herein by this reference and made a part of this Agreement.

Section 2.  Issuance of RSUs..

(a)           Issuance.  Each RSU shall represent the right to receive up to [·]% of a Share upon the vesting of such RSU as determined in accordance with this Agreement.

(b)           Voting Rights.  The Participant shall have no voting rights with respect to the RSUs unless and until the Participant becomes the record owner of the Shares, including Dividend Shares (as defined below) to the extent applicable, underlying such RSUs.

(c)           Dividend Equivalents.  If a dividend is paid on Shares during the period commencing on [insert date] and ending on the date on which the Shares underlying RSUs are distributed to the Participant, the Participant shall be eligible to receive an amount equal to the amount of the dividend that the Participant would have received had the Shares underlying the RSUs been distributed to the Participant as of the time at which such dividend is paid; it being understood that no such amount shall be payable with respect to any RSUs that are forfeited.  Such amount shall be paid to the Participant on the date on which the Shares underlying the RSUs are distributed to the Participant in the same form (cash, Shares or other property) in which such dividend is paid to holders of Shares generally.  Any Shares that the Participant is eligible to receive pursuant to this Section 2 are referred to herein as “Dividend Shares.”

(d)           Transferability.  The RSUs shall not be assigned, sold, transferred or otherwise be subject to alienation by the Participant.  Any assignment, sale, transfer or other alienation with respect to the Shares issuable upon the vesting of the RSUs shall be in accordance with applicable securities laws.

(e)           Withholding Requirements.  The Company may withhold any tax (or other governmental obligation) that becomes due with respect to the RSUs (or any dividend or distribution thereon), and the Participant shall make arrangements satisfactory to the Company to enable the Company to satisfy all such withholding requirements.  Notwithstanding the foregoing, the Committee, in its sole discretion, may permit the Participant to satisfy any such withholding requirement by

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transferring to the Company pursuant to such procedures as the Committee may require, effective as of the date on which such requirement arises, a number of vested Shares owned and designated by the Participant having an aggregate Fair Market Value as of such date that is equal to the minimum amount required to be withheld.  If the Committee permits the Participant to satisfy any such withholding requirement pursuant to the preceding sentence, the Company shall remit to the Internal Revenue Service and appropriate state and local revenue agencies, for the credit of the Participant, an amount of cash withholding equal to the Fair Market Value of the Shares transferred to the Company as provided above.

Section 3.  Accelerated Vesting, Forfeiture and Distribution.

(a)           Termination of Service.

[[For employees with a title of Senior Vice President and above:] (i) Death, Disability, without Cause or for Good Reason.  In the event of the Participant’s Termination of Service at any time due to the Participant’s death or Disability, by the Company or any Affiliate without Cause or by the Participant for Good Reason, the Service Condition shall be deemed fully satisfied as of such termination; provided that, if such termination occurs prior to [insert date], then, subject to Section 3(b), the RSUs shall remain subject to the Performance Condition.

(ii)           Without Good Reason.  In the event of the Participant’s Termination of Service at any time by the Participant without Good Reason, (x) the RSUs, if any, for which the applicable Service Condition is satisfied as of such termination shall remain subject to the Performance Condition and (y) the RSUs, if any, for which the applicable Service Condition is not satisfied as of such termination shall be forfeited in their entirety without any payment to the Participant or, in the Committee’s sole discretion, if required pursuant to applicable law to effect such forfeiture, the Company may repurchase the RSUs at their par value.]

[[For all other employees:]  (i)        Death or Disability.  In the event of the Participant’s Termination of Service at any time due to the Participant’s death or Disability, the Service Condition shall be deemed fully satisfied as of such termination; provided that, if such termination occurs prior to [insert date], then, subject to Section 3(b), the RSUs shall remain subject to the Performance Condition.

(ii)           Without Good Reason; without Cause or for Good Reason Not on or within One Year After a Change in Control.  In the event of the Participant’s Termination of Service (x) by the Participant without Good Reason at any time prior to [insert date] or (y) by the Company or any Affiliate without Cause or by the Participant for Good Reason at any time prior to [insert date] and other than on or within one year after a Change in Control, (A) the RSUs, if any, for which the applicable Service Condition is satisfied as of such termination shall remain subject to the Performance Condition and (B) the RSUs, if any, for which the applicable Service

A-2

Condition is not satisfied as of such termination shall be forfeited in their entirety without any payment to the Participant or, in the Committee’s sole discretion, if required pursuant to applicable law to effect such forfeiture, the Company may repurchase the RSUs at their par value.]

(iii)          For Cause.  In the event of the Participant’s Termination of Service at any time by the Company or any Affiliate for Cause, the RSUs shall be forfeited in their entirety without any payment to the Participant or, in the Committee’s sole discretion, if required pursuant to applicable law to effect such forfeiture, the Company may repurchase the RSUs at their par value.

(b)           Change in Control.  In the event of a Change in Control, the Performance Condition shall be deemed satisfied at [·]% as of the date of such Change in Control and, following such Change in Control, (i) [insert applicable vesting portion] of the Target RSUs will vest in the event that any of the [insert vesting schedule] occurs during the first year after such Change in Control, if the Participant does not experience a Termination of Service at any time prior to such anniversary, and (ii) all of the remaining Target RSUs will fully vest on the earlier of (x) the first anniversary of such Change in Control, if the Participant does not experience a Termination of Service at any time prior to such anniversary, and (y) the Participant’s Termination of Service due to the Participant’s death or Disability, by the Company or any Affiliate without Cause or by the Participant for Good Reason.

(c)           Distribution on Vesting.  Subject to the provisions of this Agreement, upon the vesting of any of the RSUs, the Company shall distribute to the Participant, on or within 30 days after the date of such vesting, a number of Shares for each such RSU determined in accordance with Attachment B and, to the extent applicable, the number of Dividend Shares determined in accordance with Section 2(c) of this Attachment A.  Subject to any applicable Lock Up Agreement, on such distribution, such Shares (including Dividend Shares) shall be fully assignable, saleable and transferable by the Participant, and the Company shall deliver such Shares to the Participant by transfer or issuance to the Depository Trust Company for the benefit of the Participant or by delivery of a share certificate registered in the Participant’s name and such transfer or issuance shall be evidenced in the register of members of the Company.

(d)           Effect of Failure to Achieve Performance Condition.  On [insert date], any of the RSUs for which the Performance Condition is not satisfied as of such date shall be forfeited without any payment to the Participant or, in the Committee’s sole discretion, if required pursuant to applicable law to effect such forfeiture, the Company may repurchase the RSUs at their par value.

Section 4.  Miscellaneous Provisions.

(a)           Notices.  All notices, requests and other communications under this Agreement shall be in writing and shall be delivered in person (by courier or otherwise), mailed by certified or registered mail, return receipt requested, or sent by facsimile transmission, as follows:

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if to the Company, to:

Kosmos Energy Ltd.

c/o Kosmos Energy, LLC

8176 Park Lane, Suite 500

Dallas, Texas 75231

Attention:  [·]

if to the Participant, to the address that the Participant most recently provided to the Company,

or to such other address or facsimile number as such party may hereafter specify for the purpose by notice to the other parties hereto.  All such notices, requests and other communications shall be deemed received on the date of receipt by the recipient thereof if received prior to 5:00 p.m. on a business day in the place of receipt.  Otherwise, any such notice, request or communication shall be deemed received on the next succeeding business day in the place of receipt.

(b)           Entire Agreement.  This Agreement, the Plan and any other agreements, schedules, exhibits and other documents referred to herein or therein constitute the entire agreement and understanding between the parties in respect of the subject matter hereof and supersede all prior and contemporaneous arrangements, agreements and understandings, both oral and written, whether in term sheets, presentations or otherwise, between the parties with respect to the subject matter hereof.

(c)           Amendment; Waiver.  No amendment or modification of any provision of this Agreement shall be effective unless signed in writing by or on behalf of the Company and the Participant, except that the Company may amend or modify this Agreement without the Participant’s consent in accordance with the provisions of the Plan or as otherwise set forth in this Agreement.  No waiver of any breach or condition of this Agreement shall be deemed to be a waiver of any other or subsequent breach or condition whether of like or different nature.  Any amendment or modification of or to any provision of this Agreement, or any waiver of any provision of this Agreement, shall be effective only in the specific instance and for the specific purpose for which made or given.

(d)           Assignment.  Neither this Agreement nor any right, remedy, obligation or liability arising hereunder or by reason hereof shall be assignable by the Participant.

(e)           Successors and Assigns; No Third Party Beneficiaries.  This Agreement shall inure to the benefit of and be binding upon the Company and the Participant and their respective heirs, successors, legal representatives and permitted assigns.  Nothing in this Agreement, expressed or implied, is intended to confer on any Person other than the Company and the Participant, and their respective heirs, successors, legal representatives and permitted assigns, any rights, remedies, obligations or liabilities under or by reason of this Agreement.

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(f)            Counterparts.  This Agreement may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

(g)           Participant Undertaking.  The Participant agrees to take whatever additional action and execute whatever additional documents the Company may deem necessary or advisable to carry out or give effect to any of the obligations or restrictions imposed on either the Participant or the RSUs pursuant to the provisions of this Agreement.

(h)           Plan.  The Participant acknowledges and understands that material definitions and provisions concerning the RSUs and the Participant’s rights and obligations with respect thereto are set forth in the Plan.  The Participant has read carefully, and understands, the provisions of the Plan.

(i)            Dispute Resolution.  If any dispute arising out of or relating to this Agreement or the Plan, or the breach thereof, cannot be settled through negotiation, the parties agree first to try in good faith to settle such dispute by mediation administered by the American Arbitration Association under its Commercial Mediation Rules.  If the parties fail to settle such dispute within 30 days after the commencement of such mediation, such dispute shall be settled by arbitration administered by the American Arbitration Association under its Commercial Arbitration Rules, and judgment on the arbitral award rendered may be entered in any court having jurisdiction thereof.

IN WITNESS WHEREOF, the parties have executed this Agreement as of the day and year first written above.

KOSMOS ENERGY LTD.
By:
	Name:
	Title:
	[Name of Participant]

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Attachment B

Performance Condition

Section 1.  Definitions.  As used in this Attachment B, the following terms shall have the meanings set forth below:

(a)           “End Price” with respect to a Share or a Peer Share means the average of the closing price of such Share or Peer Share on each of the [insert number of days] trading days ending with [insert date] on the applicable Principal Exchange; provided that, if such Principal Exchange is a non-U.S. stock market or exchange, each such closing price shall be converted to U.S. dollars at the applicable spot exchange rate as of such trading day; provided further that the Committee shall adjust equitably the End Price with respect to such Share or Peer Share, as calculated in accordance with the preceding clause, to reflect any corporate transaction or event set forth in Section 5(c) of the Plan that affects such Share or Peer Share if such adjustment is appropriate to prevent dilution or enlargement of the benefits or potential benefits intended to be made available under this Award.

(b)           “Peer” means any of the following companies whose shares are quoted or traded on [insert date] on a Principal Exchange:  Anadarko Petroleum Corporation, Apache Corporation, BG Group plc, Cairn Energy plc, Cobalt International Energy, Inc., HRT Participacoes em Petroleo SA, Lundin Petroleum AB, Nexen, Inc., Niko Resources Ltd., Noble Energy, Inc., OGX Petroleo e Gas Participacoes SA, Premier Oil plc and Tullow Oil plc.

(c)           “Peer Share” means the share of a Peer that is quoted or traded on  a national securities exchange.

(d)           “Principal Exchange” means the principal U.S. securities exchange or non-U.S. stock market or exchange on which a Share or Peer Share is quoted or traded as of an applicable date.  For the avoidance of doubt, a Share or Peer Share that is quoted or traded only over the counter shall not be deemed to be quoted or traded on a Principal Exchange.

(e)           “Relative TSR” means the percentile ranking of the TSR of a Share in relation to the TSR of each of the Peers’ Shares, as calculated by the Committee in good faith applying a reasonable statistical method.

(f)            “Start Price” with respect to a Share or a Peer Share means the average of the closing price of such Share or Peer Share on each of the [insert number of days] trading days ending with [insert date] on the applicable Principal Exchange; provided that, if such Principal Exchange is a non-U.S. stock market or exchange, such closing price shall be converted to U.S. dollars at the applicable spot exchange rate on such date; provided further that the Committee shall adjust equitably the Start Price with respect to such Share or Peer Share, as calculated in accordance with the preceding clause, to reflect any corporate transaction or event set forth in Section 5(c) of the Plan that affects such Share or Peer Share if such adjustment is appropriate to

B-1

prevent dilution or enlargement of the benefits or potential benefits intended to be made available under this Award.

(f)            “TSR” with respect to a Share or Peer Share means (i) the sum of (x) the End Price of such Share or Peer Share minus the Start Price of such Share or Peer Share and (y) the aggregate amount of the dividends, if any, paid on such Share or Peer Share for any dividend record dates that occur during the period beginning [insert date] and ending [insert date], divided by (ii) such Start Price.

Section 2.  Performance Condition Attainment.  (a) The following table sets forth the percentage of an RSU for which the Performance Condition shall be deemed satisfied based on the attainment of Relative TSR indicated in the corresponding row of the table:

Relative TSR (Percentile)	Performance Condition Attainment(%)
[·]	[·]
[·]	[·]
[·]	[·]
[·]	[·]

(b)           If Relative TSR equals or exceeds the [·]th percentile and is less than the [·]th percentile, the percentage of an RSU for which the Performance Condition shall be deemed satisfied shall equal the sum of (i) [·] and (ii) the product of (x) [·] and (y) the amount of such excess.  For purposes of illustration only, if Relative TSR is the [·]th percentile, the percentage of an RSU for which the Performance Condition shall be deemed satisfied shall equal [·] (i.e., [·] + ([·] x [·])).

(c)           If Relative TSR equals or exceeds the [·]th percentile and is less than the [·]th percentile, the percentage of an RSU for which the Performance Condition shall be deemed satisfied shall equal the sum of (i) [·] and (ii) the product of (x) [·] and (y) the amount of such excess.  For purposes of illustration only, if Relative TSR is the [·]th percentile, the percentage of an RSU for which the Performance Condition shall be deemed satisfied shall equal [·] (i.e., [·] + ([·] x [·])).

(d) For the avoidance of doubt, to the extent that the total number of Shares (including Dividend Shares, to the extent applicable) eligible to be distributed to the Participant upon vesting of the RSUs pursuant to this Award would otherwise result in the issuance of a fractional Share, such fractional Share shall be cancelled in exchange for a cash payment therefor.

B-2

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Brian F. Maxted, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Kosmos Energy Ltd.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Reserved.

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 5, 2012	/s/ Brian F. Maxted
	Brian F. Maxted
	Director and Chief Executive Officer (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, W. Greg Dunlevy, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Kosmos Energy Ltd.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Reserved.

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 5, 2012	/s/ W. Greg Dunlevy
	W. Greg Dunlevy
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the accompanying quarterly report of Kosmos Energy Ltd. (the “Company”) on Form 10-Q for the quarter ended September 30, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Brian F. Maxted, Director and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 5, 2012	/s/ Brian F. Maxted
	Brian F. Maxted
	Director and Chief Executive Officer (Principal Executive Officer)

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the accompanying quarterly report of Kosmos Energy Ltd. (the “Company”) on Form 10-Q for the quarter ended September 30, 2012 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, W. Greg Dunlevy, Chief Financial Officer and Executive Vice President of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 5, 2012	/s/ W. Greg Dunlevy
	W. Greg Dunlevy
	Chief Financial Officer and Executive Vice President (Principal Financial Officer)

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Accounting Policies (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Restricted Cash
Current restricted cash	$ 21,336,000	$ 23,747,000
Long-term restricted cash	29,300,000	3,800,000
Inventories
Materials and supplies inventory	32,800,000	26,900,000
Hydrocarbons inventory	5,200,000	200,000
Restricted Cash | Commercial Debt Facility
Restricted Cash
Restricted cash period required as per commercial debt facility to meet interest and commitment fee payments	6 months
Current restricted cash	21,300,000	23,700,000
Restricted Cash | Petroleum agreements - performance guarantees
Restricted Cash
Long-term restricted cash	$ 29,300,000	$ 3,800,000

XML

Asset Retirement Obligations (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Asset retirement obligations:
Beginning asset retirement obligations	$ 20,670
Accretion expense	1,992
Ending asset retirement obligations	$ 22,662

XML

Debt (Details) (USD $)	1 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended			0 Months Ended
	Mar. 31, 2011	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2012 Facility	Sep. 30, 2011 Facility	Sep. 30, 2012 Facility	Sep. 30, 2011 Facility	Oct. 31, 2012 Facility Subsequent event	Oct. 15, 2012 Facility Minimum	Sep. 30, 2012 Facility Minimum	Sep. 30, 2012 Facility Maximum
Debt
Borrowing capacity				$ 2,000,000,000		$ 2,000,000,000
Maximum increased borrowing capacity				3,000,000,000		3,000,000,000
Loss on extinguishment of debt	59,600,000	59,643,000
Deferred financing costs				61,300,000		61,300,000
Borrowings				1,000,000,000		1,000,000,000
Undrawn availability				160,000,000		160,000,000		340,400,000
Increase in undrawn availability								180,400,000
Interest expense, net of capitalized interest				8,200,000	9,300,000	26,600,000	36,600,000
Capitalized interest				2,800,000	1,000,000	7,300,000	3,000,000
Commitment fees				1,500,000	2,200,000	4,800,000	5,700,000
Applicable margin (as a percent)										3.25%	4.75%
Variable rate basis						LIBOR
Commitment fee percentage of the then-applicable margin when commitment is available for utilization				40.00%
Commitment fee percentage of the then-applicable margin when commitment is not available for utilization				20.00%
Deferred interest expense				1,200,000	1,000,000	4,300,000	2,200,000
Field life cover ratio									1.30
Loan life cover ratio									1.10
Scheduled maturities of debt during the five year period and thereafter
2016			444,444,000
Thereafter			$ 555,556,000

XML

Convertible Preferred Units (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	9 Months Ended			1 Months Ended		9 Months Ended	1 Months Ended		1 Months Ended		1 Months Ended
	May 31, 2011	Sep. 30, 2012 vote	Sep. 30, 2011	Dec. 31, 2011	May 31, 2011 Convertible preferred units	May 31, 2011 Kosmos Energy Holdings Convertible preferred units	Sep. 30, 2011 Kosmos Energy Holdings Convertible preferred units	May 31, 2011 Kosmos Energy Holdings Series A Convertible Preferred Units	May 16, 2011 Kosmos Energy Holdings Series A Convertible Preferred Units	May 31, 2011 Kosmos Energy Holdings Series B Convertible Preferred Units	May 16, 2011 Kosmos Energy Holdings Series B Convertible Preferred Units	May 31, 2011 Kosmos Energy Holdings Series C Convertible Preferred Units	May 16, 2011 Kosmos Energy Holdings Series C Convertible Preferred Units
Convertible Preferred Units
Number of common shares into which the units were exchanged	277.7							163.1		109.8		4.8
Voting rights per common share		1
Common shares, par value (in dollars per share)		$ 0.01		$ 0.01
Effect of exchange on book value of shareholders' equity					$ 1,000,000,000
Original unit purchase price									$ 10		$ 25		$ 28.25
Accretion amount			$ 24,442,000				$ 24,400,000
Preferred return per annum for first nine years (as a percent)						7.00%
Preferred return per annum after first nine years (as a percent)						14.00%

XML

Suspended Well Costs (Details) (USD $)	9 Months Ended
	Sep. 30, 2012 project	Dec. 31, 2011 project
Suspended Well Costs
Capitalized exploratory well costs subsequently expensed in the same period	$ 16,700,000
Reconciliation of capitalized exploratory well costs on completed wells
Balance at the beginning of the period	267,592,000
Additions to capitalized exploratory well costs pending the determination of proved reserves	104,255,000
Capitalized exploratory well costs charged to expense	(2,627,000)
Balance at the end of the period	369,220,000
Aging of capitalized exploratory well costs and number of projects for which exploratory well costs were capitalized for more than one year
Exploratory well costs capitalized for a period of one year or less	129,389,000	132,838,000
Exploratory well costs capitalized for a period one to three years	239,831,000	134,754,000
Ending balance	$ 369,220,000
Number of projects with exploratory well costs that were capitalized for more than one year	7	3
Mahogany East Area | Minimum
Projects with exploratory well costs capitalized for more than one year
Period of negotiation and consultation of notice of dispute issued to Ministry of Energy by the entity	30 days
Teak-1 Discovery
Projects with exploratory well costs capitalized for more than one year
Number of appraisal wells which were drilled	2
Teak-1 Discovery | Maximum
Projects with exploratory well costs capitalized for more than one year
Submission of PoD to Ghana's Ministry of Energy, period	6 months
Teak-2 Discovery | Maximum
Projects with exploratory well costs capitalized for more than one year
Submission of PoD to Ghana's Ministry of Energy, period	6 months
Akasa Discovery | Maximum
Projects with exploratory well costs capitalized for more than one year
Submission of PoD to Ghana's Ministry of Energy, period	6 months
Ntomme Discovery
Projects with exploratory well costs capitalized for more than one year
Number of appraisal wells which were drilled	1
Ntomme Discovery | Maximum
Projects with exploratory well costs capitalized for more than one year
Submission of PoD to Ghana's Ministry of Energy, period	6 months
Tweneboa Discovery
Projects with exploratory well costs capitalized for more than one year
Number of appraisal wells which were drilled	3
Tweneboa Discovery | Maximum
Projects with exploratory well costs capitalized for more than one year
Submission of PoD to Ghana's Ministry of Energy, period	6 months
Enyenra Discovery
Projects with exploratory well costs capitalized for more than one year
Number of appraisal wells which were drilled	4
Enyenra Discovery | Maximum
Projects with exploratory well costs capitalized for more than one year
Submission of PoD to Ghana's Ministry of Energy, period	6 months

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Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2012

Asset Retirement Obligations

Schedule of changes in asset retirement obligations

	September 30, 2012
	(In thousands)
Asset retirement obligations:
Beginning asset retirement obligations	$	20,670
Liabilities incurred during period	—
Revisions in estimated retirement obligations	—
Liabilities settled during period	—
Accretion expense	1,992
Ending asset retirement obligations	$	22,662

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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Income tax expense	$ 25,923	$ 50,481	$ 64,730	$ 48,505
Income Taxes
Income (loss) before income taxes	(10,327)	102,257	(33,904)	36,539
Effective tax rate (as a percent)	(251.00%)	49.00%	(191.00%)	133.00%
Bermuda
Income Taxes
Income (loss) before income taxes	(2,316)	5,945	(8,735)	(2,901)
United States
Income Taxes
Income (loss) before income taxes	3,145	3,430	9,492	4,239
Effective tax rate (as a percent)	43.00%	35.00%	116.00%	36.00%
Foreign-other
Income Taxes
Income (loss) before income taxes	$ (11,156)	$ 92,882	$ (34,661)	$ 35,201
Effective tax rate (as a percent)	0.00%	0.00%	0.00%	0.00%
Statutory rate (as a percent)	0.00%	0.00%	0.00%	0.00%
Ghana | Minimum
Income Taxes
Effective tax rate (as a percent)	32.00%	32.00%	32.00%	32.00%
Ghana | Maximum
Income Taxes
Effective tax rate (as a percent)	39.00%	39.00%	39.00%	39.00%

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Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2012

Accounting Policies

General

General

The interim-period financial information presented in the consolidated financial statements included in this report is unaudited and, in the opinion of management, includes all adjustments of a normal recurring nature necessary to present fairly the consolidated financial position as of September 30, 2012, the consolidated results of operations for the three and nine months ended September 30, 2012 and 2011, and consolidated cash flows for the nine months ended September 30, 2012 and 2011. The results of the interim periods shown in this report are not necessarily indicative of the final results to be expected for the full year. These consolidated financial statements and the accompanying notes should be read in conjunction with our audited consolidated financial statements for the year ended December 31, 2011, included in our annual report on Form 10-K.

Principles of Consolidation

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Kosmos Energy Ltd. and its wholly owned subsidiaries. All intercompany transactions have been eliminated.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosures of contingent assets and liabilities. Actual results could differ from these estimates.

Reclassifications

Reclassifications

Certain prior period amounts have been reclassified to conform with the current year presentation. Such reclassifications had no impact on our reported net income, current assets, total assets, current liabilities, total liabilities or shareholders equity.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents includes demand deposits and funds invested in highly liquid instruments with original maturities of three months or less at the date of purchase.

Restricted Cash

Restricted Cash

In accordance with our commercial debt facility, we are required to maintain a restricted cash balance that is sufficient to meet the payment of interest and fees for the next six-month period. As of September 30, 2012 and December 31, 2011, we had $21.3 million and $23.7 million, respectively, in current restricted cash to meet this requirement. Additionally as of September 30, 2012 and December 31, 2011, we had $29.3 million and $3.8 million, respectively, of long-term restricted cash used to cash collateralize performance guarantees related to our petroleum agreements.

Receivables

Receivables

Our receivables consist of joint interest billings, oil sales and other receivables for which the Company generally does not require collateral security. Receivables from joint interest owners are stated at amounts due, net of any allowances for doubtful accounts. We determine our allowance by considering the length of time past due, future net revenues of the debtor’s ownership interest in oil and natural gas properties we operate, and the owner’s ability to pay its obligation, among other things. We did not have any allowances for doubtful accounts as of September 30, 2012 and December 31, 2011.

Inventories

Inventories

Inventories consisted of $32.8 million and $26.9 million of materials and supplies and $5.2 million and $0.2 million of hydrocarbons as of September 30, 2012 and December 31, 2011, respectively. The Company’s materials and supplies inventory primarily consists of casing and wellheads and is stated at the lower of cost, using the weighted average cost method, or market.

Hydrocarbon inventory is carried at the lower of cost, using the weighted average cost method, or market. Hydrocarbon inventory costs include expenditures and other charges (including depletion) directly and indirectly incurred in bringing the inventory to its existing condition. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory costs.

Exploration and Development Costs

Exploration and Development Costs

The Company follows the successful efforts method of accounting for its oil and gas properties. Acquisition costs for proved and unproved properties are capitalized when incurred. Costs of unproved properties are transferred to proved properties when a determination that proved reserves have been found. Exploration costs, including geological and geophysical costs and costs of carrying unproved properties, are expensed as incurred. Exploratory drilling costs are capitalized when incurred. If exploratory wells are determined to be commercially unsuccessful or dry holes, the applicable costs are expensed and recorded in exploration expenses on the consolidated statement of operations. Costs incurred to drill and equip development wells, including unsuccessful development wells, are capitalized. Costs incurred to operate and maintain wells and equipment and to lift oil and natural gas to the surface are expensed.

The Company evaluates unproved property periodically for impairment. These costs are generally related to the acquisition of leasehold costs. The impairment assessment considers results of exploration activities, commodity price outlooks, planned future sales or expiration of all or a portion of such projects. If the quantity of potential future reserves determined by such evaluations is not sufficient to fully recover the cost invested in each project, the Company will recognize an impairment loss at that time.

Depletion, Depreciation and Amortization

Depletion, Depreciation and Amortization

Proved properties and support equipment and facilities are depleted using the unit-of-production method based on estimated proved oil and natural gas reserves. Capitalized exploratory drilling costs that result in a discovery of proved reserves and development costs are amortized using the unit-of-production method based on estimated proved oil and natural gas reserves for the related field.

Depreciation and amortization of other property is computed using the straight-line method over the assets’ estimated useful lives (not to exceed the lease term for leasehold improvements), ranging from three to eight years.

	Years Depreciated
Leasehold improvements	6 to 8
Office furniture, fixtures and computer equipment	3 to 7
Vehicles	5

Amortization of deferred financing costs is computed using the straight-line method over the life of the related debt.

Capitalized Interest

Capitalized Interest

Interest costs from external borrowings are capitalized on major projects with an expected construction period of one year or longer. Capitalized interest is added to the cost of the underlying asset and is amortized over the useful lives of the assets in the same manner as the underlying assets.

Asset Retirement Obligations

Asset Retirement Obligations

The Company accounts for asset retirement obligations as required by ASC 410—Asset Retirement and Environmental Obligations. Under these standards, the fair value of a liability for an asset retirement obligation is recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. If a reasonable estimate of fair value cannot be made in the period the asset retirement obligation is incurred, the liability is recognized when a reasonable estimate of fair value can be made. If a tangible long-lived asset with an existing asset retirement obligation is acquired, a liability for that obligation is recognized at the asset’s acquisition date. In addition, a liability for the fair value of a conditional asset retirement obligation is recorded if the fair value of the liability can be reasonably estimated. We capitalize the asset retirement costs by increasing the carrying amount of the related long-lived asset by the same amount as the liability. We record increases in the discounted abandonment liability resulting from the passage of time in depletion and depreciation in the consolidated statement of operations.

Variable Interest Entity

Variable Interest Entity

A variable interest entity (“VIE”), as defined by ASC 810—Consolidation, is an entity that by design has insufficient equity to permit it to finance its activities without additional subordinated financial support or equity holders that lack the characteristics of a controlling financial interest. VIEs are consolidated by the primary beneficiary, which is the entity that has the power to direct the activities of the VIE that most significantly impact the VIE’s performance and will absorb losses or receive benefits from the VIE that could potentially be significant to the VIE.

Our wholly owned subsidiary, Kosmos Energy Finance International, meets the definition of a VIE. The Company is the primary beneficiary of this VIE, which is consolidated in these financial statements.

Prior to the incorporation of Kosmos Energy Finance International on March 18, 2011, Kosmos Energy Finance International did not have any financial statement activity. Kosmos Energy Finance International’s assets and liabilities are shown separately on the face of the consolidated balance sheet as of September 30, 2012, and December 31, 2011, in the following line items: current restricted cash; deferred financing costs; long-term debt; and current and long-term derivatives liabilities. At September 30, 2012, Kosmos Energy Finance International had $119.8 million in cash and cash equivalents, $0.4 million in prepaid expenses and other, $0.6 million in accrued liabilities and $7.2 million in other long-term liabilities. At December 31, 2011, Kosmos Energy Finance International had $231.6 million in cash and cash equivalents, $0.1 million in other receivables, $1.2 million in accrued liabilities and $3.0 million in other long-term liabilities.

Impairment of Long-lived Assets

Impairment of Long-lived Assets

The Company reviews its long-lived assets for impairment when changes in circumstances indicate that the carrying amount of an asset may not be recoverable. ASC 360—Property, Plant and Equipment requires an impairment loss to be recognized if the carrying amount of a long-lived asset is not recoverable and exceeds its fair value. The carrying amount of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. That assessment shall be based on the carrying amount of the asset at the date it is tested for recoverability, whether in use or under development. An impairment loss shall be measured as the amount by which the carrying amount of a long-lived asset exceeds its fair value. Assets to be disposed of and assets not expected to provide any future service potential to the Company are recorded at the lower of carrying amount or fair value less cost to sell.

Derivative Instruments and Hedging Activities

Derivative Instruments and Hedging Activities

We utilize oil derivative contracts to mitigate our exposure to commodity price risk associated with our anticipated future oil production. These derivative contracts consist of purchased puts, swaps with calls and three-way collars. We also use interest rate swap contracts to mitigate our exposure to interest rate fluctuations related to our long-term debt. Our derivative financial instruments are recorded on the balance sheet as either assets or liabilities and are measured at fair value. We do not apply hedge accounting to our oil derivative contracts. Effective June 1, 2010, we discontinued hedge accounting on our interest rate swap contracts. Therefore, from that date forward, the changes in the fair value of the instruments are recognized in earnings during the period of change. See Note 10—Derivative Financial Instruments.

Estimates of Proved Oil and Natural Gas Reserves

Estimates of Proved Oil and Natural Gas Reserves

Reserve quantities and the related estimates of future net cash flows affect our periodic calculations of depletion and assessment of impairment of our oil and natural gas properties. Proved oil and natural gas reserves are the estimated quantities of crude oil, natural gas and natural gas liquids that geological and engineering data demonstrate with reasonable certainty to be recoverable in future periods from known reservoirs under existing economic and operating conditions. As additional proved reserves are discovered, reserve quantities and future cash flows will be estimated by independent petroleum consultants and prepared in accordance with guidelines established by the Securities and Exchange Commission (“SEC”) and the FASB. The accuracy of these reserve estimates is a function of:

·the engineering and geological interpretation of available data;

·estimates of the amount and timing of future operating cost, production taxes, development cost and workover cost;

·the accuracy of various mandated economic assumptions; and

·the judgments of the persons preparing the estimates.

Revenue Recognition

Revenue Recognition

We use the sales method of accounting for oil and gas revenues. Under this method, we recognize revenues on the volumes sold based on the provisional sales prices. The volumes sold may be more or less than the volumes to which we are entitled based on our ownership interest in the property. These differences result in a condition known in the industry as a production imbalance. A receivable or liability is recognized only to the extent that we have an imbalance on a specific property greater than the expected remaining proved reserves on such property. As of September 30, 2012 and December 31, 2011, we had no oil and gas imbalances recorded in our consolidated financial statements.

Our oil and gas revenues are based on provisional price contracts which contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from oil sales at the spot price on the date of sale. The embedded derivative, which is not designated as a hedge, is marked to market through oil and gas revenue each period until the final settlement occurs, which generally is limited to the month after the sale occurs.

Equity-based Compensation

Equity-based Compensation

For equity-based compensation awards, compensation expense is recognized in the Company’s financial statements over the awards’ vesting periods based on their grant date fair value. The Company utilizes (i) the closing stock price on the date of grant to determine the fair value of service vesting restricted stock awards and restricted stock units and (ii) a Monte Carlo simulation to determine the fair value of restricted stock awards and restricted stock units with a combination of market and service vesting criteria.

Treasury Stock

Treasury Stock

We record treasury stock purchases at cost. All of our treasury stock purchases are from our employees that surrendered shares to the Company to satisfy their minimum tax withholding requirements and were not part of a formal stock repurchase plan. Additionally, treasury stock includes forfeited restricted stock awards granted under our long-term incentive plan.

Income Taxes

Income Taxes

The Company accounts for income taxes as required by ASC 740—Income Taxes. Under this method, deferred income taxes are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. On a quarterly basis, management evaluates the need for and adequacy of valuation allowances based on the expected realizability of the deferred tax assets and adjusts the amount of such allowances, if necessary.

We recognize tax benefits from uncertain tax positions only if it is more likely than not that the tax position will be sustained upon examination by the tax authorities, based on the technical merits of the position. Accordingly, we measure tax benefits from such positions based on the most likely outcome to be realized.

Foreign Currency Translation

Foreign Currency Translation

The U.S. dollar is the functional currency for the Company’s foreign operations. Foreign currency transaction gains and losses and adjustments resulting from translating monetary assets and liabilities denominated in foreign currencies are included in other expenses. Cash balances held in foreign currencies are not significant, and as such, the effect of exchange rate changes is not material to any reporting period.

Concentration of Credit Risk

Concentration of Credit Risk

There are a variety of factors which affect the market for oil, including the proximity and capacity of transportation facilities, demand for oil, the marketing of competitive fuels and the effects of government regulations on oil production and sales. Our revenue can be materially affected by current economic conditions and the price of oil. However, based on the current demand for crude oil and the fact that alternative purchasers are readily available, we believe that the loss of our marketing agent and/or any of the purchasers identified by our marketing agent would not have a long-term material adverse effect on our financial position or results of operations. We have required our marketing agent to post a letter of credit covering the estimated proceeds from our revenue transactions, until such proceeds are received.

Recent Accounting Standards

Recent Accounting Standards

In December 2011, the FASB issued ASU No. 2011-11, “Disclosures about Offsetting Assets and Liabilities,” to improve reporting and transparency of offsetting (netting) assets and liabilities and the related effects on the financial statements. This ASU is effective for fiscal years and interim periods within those years beginning on or after January 1, 2013. We do not expect the adoption of this ASU will have a material effect on our consolidated financial statements.

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Derivative Financial Instruments (Details 2) (Interest Rate Swaps, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Term October 2012 to December 2012
Derivative Financial Instruments
Weighted Average Notional Amount	$ 306,420
Weighted Average Fixed Rate	1.98%
Floating Rate	6-month LIBOR
Term January 2013 to December 2013
Derivative Financial Instruments
Weighted Average Notional Amount	227,103
Weighted Average Fixed Rate	2.06%
Floating Rate	6-month LIBOR
Term January 2014 to December 2014
Derivative Financial Instruments
Weighted Average Notional Amount	133,434
Weighted Average Fixed Rate	1.99%
Floating Rate	6-month LIBOR
Term January 2015 to December 2015
Derivative Financial Instruments
Weighted Average Notional Amount	45,319
Weighted Average Fixed Rate	2.03%
Floating Rate	6-month LIBOR
Term January 2016 to June 2016
Derivative Financial Instruments
Weighted Average Notional Amount	$ 12,500
Weighted Average Fixed Rate	2.27%
Floating Rate	6-month LIBOR

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Acquisition of FPSO (Details) (FPSO, USD $) In Millions, unless otherwise specified	Dec. 29, 2011
Acquisition of FPSO
Acquisition cost	$ 202.6
Notes receivable applied to FPSO purchase	102.8
Cash paid for purchase	99.8
Tullow
Acquisition of FPSO
Acquisition cost	$ 754.5

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Organization (Details) (Chevron, Block 42 and Block 45)	1 Months Ended
	May 31, 2012
Chevron | Block 42 and Block 45
Organization
Working interest to be assigned to Chevron (as a percent)	50.00%
Working interest upon closing of transaction	50.00%

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Derivative Financial Instruments (Details 4) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative instruments, Location of Gain/(Loss)
Amount of Gain/(Loss), derivatives not designated as hedging instruments	$ (13,966,000)	$ 2,383,000	$ (13,552,000)	$ (14,012,000)
Gains expected to be reclassified from AOCI to interest expense			1,300,000
Commodity derivatives | Derivatives, net
Derivative instruments, Location of Gain/(Loss)
Amount of Gain/(Loss), derivatives not designated as hedging instruments	(24,529,000)	4,984,000	(26,407,000)	(5,250,000)
Commodity derivatives | Oil and gas revenue
Derivative instruments, Location of Gain/(Loss)
Amount of Gain/(Loss), derivatives not designated as hedging instruments	11,494,000	1,320,000	15,221,000	1,171,000
Interest rate contracts | Interest expense
Derivative instruments, Location of Gain/(Loss)
Amount of Gain/(Loss), derivatives not designated as hedging instruments	(931,000)	(3,921,000)	(2,366,000)	(9,933,000)
Derivatives in cash flow hedging relationships | Interest rate contracts
Derivative instruments, Location of Gain/(Loss)
Total derivatives in cash flow hedging relationships	133,000	(1,193,000)	(295,000)	(2,934,000)
Derivatives in cash flow hedging relationships | Interest rate contracts | Interest expense
Derivative instruments, Location of Gain/(Loss)
Amount of Gain/(Loss), reclassified from AOCI into earnings	$ 133,000	$ (1,193,000)	$ (295,000)	$ (2,934,000)

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Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities
Accounts payable	$ 128,231	$ 278,006
Accrued liabilities:
Accrued exploration, development and production	40,212	27,666
Accrued general and administrative expenses	11,303	2,159
Accrued taxes other than income	11,252	1,095
Accrued interest	620	1,208
Accrued income taxes	1,306	5,066
Accrued liabilities	$ 64,693	$ 37,194

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Accounting Policies

9 Months Ended

Sep. 30, 2012

Accounting Policies

Accounting Policies

2. Accounting Policies

General

The interim-period financial information presented in the consolidated financial statements included in this report is unaudited and, in the opinion of management, includes all adjustments of a normal recurring nature necessary to present fairly the consolidated financial position as of September 30, 2012, the consolidated results of operations for the three and nine months ended September 30, 2012 and 2011, and consolidated cash flows for the nine months ended September 30, 2012 and 2011. The results of the interim periods shown in this report are not necessarily indicative of the final results to be expected for the full year. These consolidated financial statements and the accompanying notes should be read in conjunction with our audited consolidated financial statements for the year ended December 31, 2011, included in our annual report on Form 10-K.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Kosmos Energy Ltd. and its wholly owned subsidiaries. All intercompany transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosures of contingent assets and liabilities. Actual results could differ from these estimates.

Reclassifications

Certain prior period amounts have been reclassified to conform with the current year presentation. Such reclassifications had no impact on our reported net income, current assets, total assets, current liabilities, total liabilities or shareholders equity.

Cash and Cash Equivalents

Cash and cash equivalents includes demand deposits and funds invested in highly liquid instruments with original maturities of three months or less at the date of purchase.

Restricted Cash

In accordance with our commercial debt facility, we are required to maintain a restricted cash balance that is sufficient to meet the payment of interest and fees for the next six-month period. As of September 30, 2012 and December 31, 2011, we had $21.3 million and $23.7 million, respectively, in current restricted cash to meet this requirement. Additionally as of September 30, 2012 and December 31, 2011, we had $29.3 million and $3.8 million, respectively, of long-term restricted cash used to cash collateralize performance guarantees related to our petroleum agreements.

Receivables

Our receivables consist of joint interest billings, oil sales and other receivables for which the Company generally does not require collateral security. Receivables from joint interest owners are stated at amounts due, net of any allowances for doubtful accounts. We determine our allowance by considering the length of time past due, future net revenues of the debtor’s ownership interest in oil and natural gas properties we operate, and the owner’s ability to pay its obligation, among other things. We did not have any allowances for doubtful accounts as of September 30, 2012 and December 31, 2011.

Inventories

Inventories consisted of $32.8 million and $26.9 million of materials and supplies and $5.2 million and $0.2 million of hydrocarbons as of September 30, 2012 and December 31, 2011, respectively. The Company’s materials and supplies inventory primarily consists of casing and wellheads and is stated at the lower of cost, using the weighted average cost method, or market.

Hydrocarbon inventory is carried at the lower of cost, using the weighted average cost method, or market. Hydrocarbon inventory costs include expenditures and other charges (including depletion) directly and indirectly incurred in bringing the inventory to its existing condition. Selling expenses and general and administrative expenses are reported as period costs and excluded from inventory costs.

Exploration and Development Costs

The Company follows the successful efforts method of accounting for its oil and gas properties. Acquisition costs for proved and unproved properties are capitalized when incurred. Costs of unproved properties are transferred to proved properties when a determination that proved reserves have been found. Exploration costs, including geological and geophysical costs and costs of carrying unproved properties, are expensed as incurred. Exploratory drilling costs are capitalized when incurred. If exploratory wells are determined to be commercially unsuccessful or dry holes, the applicable costs are expensed and recorded in exploration expenses on the consolidated statement of operations. Costs incurred to drill and equip development wells, including unsuccessful development wells, are capitalized. Costs incurred to operate and maintain wells and equipment and to lift oil and natural gas to the surface are expensed.

The Company evaluates unproved property periodically for impairment. These costs are generally related to the acquisition of leasehold costs. The impairment assessment considers results of exploration activities, commodity price outlooks, planned future sales or expiration of all or a portion of such projects. If the quantity of potential future reserves determined by such evaluations is not sufficient to fully recover the cost invested in each project, the Company will recognize an impairment loss at that time.

Depletion, Depreciation and Amortization

Proved properties and support equipment and facilities are depleted using the unit-of-production method based on estimated proved oil and natural gas reserves. Capitalized exploratory drilling costs that result in a discovery of proved reserves and development costs are amortized using the unit-of-production method based on estimated proved oil and natural gas reserves for the related field.

Depreciation and amortization of other property is computed using the straight-line method over the assets’ estimated useful lives (not to exceed the lease term for leasehold improvements), ranging from three to eight years.

	Years Depreciated
Leasehold improvements	6 to 8
Office furniture, fixtures and computer equipment	3 to 7
Vehicles	5

Amortization of deferred financing costs is computed using the straight-line method over the life of the related debt.

Capitalized Interest

Interest costs from external borrowings are capitalized on major projects with an expected construction period of one year or longer. Capitalized interest is added to the cost of the underlying asset and is amortized over the useful lives of the assets in the same manner as the underlying assets.

Asset Retirement Obligations

The Company accounts for asset retirement obligations as required by ASC 410—Asset Retirement and Environmental Obligations. Under these standards, the fair value of a liability for an asset retirement obligation is recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. If a reasonable estimate of fair value cannot be made in the period the asset retirement obligation is incurred, the liability is recognized when a reasonable estimate of fair value can be made. If a tangible long-lived asset with an existing asset retirement obligation is acquired, a liability for that obligation is recognized at the asset’s acquisition date. In addition, a liability for the fair value of a conditional asset retirement obligation is recorded if the fair value of the liability can be reasonably estimated. We capitalize the asset retirement costs by increasing the carrying amount of the related long-lived asset by the same amount as the liability. We record increases in the discounted abandonment liability resulting from the passage of time in depletion and depreciation in the consolidated statement of operations.

Variable Interest Entity

A variable interest entity (“VIE”), as defined by ASC 810—Consolidation, is an entity that by design has insufficient equity to permit it to finance its activities without additional subordinated financial support or equity holders that lack the characteristics of a controlling financial interest. VIEs are consolidated by the primary beneficiary, which is the entity that has the power to direct the activities of the VIE that most significantly impact the VIE’s performance and will absorb losses or receive benefits from the VIE that could potentially be significant to the VIE.

Our wholly owned subsidiary, Kosmos Energy Finance International, meets the definition of a VIE. The Company is the primary beneficiary of this VIE, which is consolidated in these financial statements.

Prior to the incorporation of Kosmos Energy Finance International on March 18, 2011, Kosmos Energy Finance International did not have any financial statement activity. Kosmos Energy Finance International’s assets and liabilities are shown separately on the face of the consolidated balance sheet as of September 30, 2012, and December 31, 2011, in the following line items: current restricted cash; deferred financing costs; long-term debt; and current and long-term derivatives liabilities. At September 30, 2012, Kosmos Energy Finance International had $119.8 million in cash and cash equivalents, $0.4 million in prepaid expenses and other, $0.6 million in accrued liabilities and $7.2 million in other long-term liabilities. At December 31, 2011, Kosmos Energy Finance International had $231.6 million in cash and cash equivalents, $0.1 million in other receivables, $1.2 million in accrued liabilities and $3.0 million in other long-term liabilities.

Impairment of Long-lived Assets

The Company reviews its long-lived assets for impairment when changes in circumstances indicate that the carrying amount of an asset may not be recoverable. ASC 360—Property, Plant and Equipment requires an impairment loss to be recognized if the carrying amount of a long-lived asset is not recoverable and exceeds its fair value. The carrying amount of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. That assessment shall be based on the carrying amount of the asset at the date it is tested for recoverability, whether in use or under development. An impairment loss shall be measured as the amount by which the carrying amount of a long-lived asset exceeds its fair value. Assets to be disposed of and assets not expected to provide any future service potential to the Company are recorded at the lower of carrying amount or fair value less cost to sell.

Derivative Instruments and Hedging Activities

We utilize oil derivative contracts to mitigate our exposure to commodity price risk associated with our anticipated future oil production. These derivative contracts consist of purchased puts, swaps with calls and three-way collars. We also use interest rate swap contracts to mitigate our exposure to interest rate fluctuations related to our long-term debt. Our derivative financial instruments are recorded on the balance sheet as either assets or liabilities and are measured at fair value. We do not apply hedge accounting to our oil derivative contracts. Effective June 1, 2010, we discontinued hedge accounting on our interest rate swap contracts. Therefore, from that date forward, the changes in the fair value of the instruments are recognized in earnings during the period of change. See Note 10—Derivative Financial Instruments.

Estimates of Proved Oil and Natural Gas Reserves

Reserve quantities and the related estimates of future net cash flows affect our periodic calculations of depletion and assessment of impairment of our oil and natural gas properties. Proved oil and natural gas reserves are the estimated quantities of crude oil, natural gas and natural gas liquids that geological and engineering data demonstrate with reasonable certainty to be recoverable in future periods from known reservoirs under existing economic and operating conditions. As additional proved reserves are discovered, reserve quantities and future cash flows will be estimated by independent petroleum consultants and prepared in accordance with guidelines established by the Securities and Exchange Commission (“SEC”) and the FASB. The accuracy of these reserve estimates is a function of:

·the engineering and geological interpretation of available data;

·estimates of the amount and timing of future operating cost, production taxes, development cost and workover cost;

·the accuracy of various mandated economic assumptions; and

·the judgments of the persons preparing the estimates.

Revenue Recognition

We use the sales method of accounting for oil and gas revenues. Under this method, we recognize revenues on the volumes sold based on the provisional sales prices. The volumes sold may be more or less than the volumes to which we are entitled based on our ownership interest in the property. These differences result in a condition known in the industry as a production imbalance. A receivable or liability is recognized only to the extent that we have an imbalance on a specific property greater than the expected remaining proved reserves on such property. As of September 30, 2012 and December 31, 2011, we had no oil and gas imbalances recorded in our consolidated financial statements.

Our oil and gas revenues are based on provisional price contracts which contain an embedded derivative that is required to be separated from the host contract for accounting purposes. The host contract is the receivable from oil sales at the spot price on the date of sale. The embedded derivative, which is not designated as a hedge, is marked to market through oil and gas revenue each period until the final settlement occurs, which generally is limited to the month after the sale occurs.

Equity-based Compensation

For equity-based compensation awards, compensation expense is recognized in the Company’s financial statements over the awards’ vesting periods based on their grant date fair value. The Company utilizes (i) the closing stock price on the date of grant to determine the fair value of service vesting restricted stock awards and restricted stock units and (ii) a Monte Carlo simulation to determine the fair value of restricted stock awards and restricted stock units with a combination of market and service vesting criteria.

Treasury Stock

We record treasury stock purchases at cost. All of our treasury stock purchases are from our employees that surrendered shares to the Company to satisfy their minimum tax withholding requirements and were not part of a formal stock repurchase plan. Additionally, treasury stock includes forfeited restricted stock awards granted under our long-term incentive plan.

Income Taxes

The Company accounts for income taxes as required by ASC 740—Income Taxes. Under this method, deferred income taxes are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. On a quarterly basis, management evaluates the need for and adequacy of valuation allowances based on the expected realizability of the deferred tax assets and adjusts the amount of such allowances, if necessary.

We recognize tax benefits from uncertain tax positions only if it is more likely than not that the tax position will be sustained upon examination by the tax authorities, based on the technical merits of the position. Accordingly, we measure tax benefits from such positions based on the most likely outcome to be realized.

Foreign Currency Translation

The U.S. dollar is the functional currency for the Company’s foreign operations. Foreign currency transaction gains and losses and adjustments resulting from translating monetary assets and liabilities denominated in foreign currencies are included in other expenses. Cash balances held in foreign currencies are not significant, and as such, the effect of exchange rate changes is not material to any reporting period.

Concentration of Credit Risk

There are a variety of factors which affect the market for oil, including the proximity and capacity of transportation facilities, demand for oil, the marketing of competitive fuels and the effects of government regulations on oil production and sales. Our revenue can be materially affected by current economic conditions and the price of oil. However, based on the current demand for crude oil and the fact that alternative purchasers are readily available, we believe that the loss of our marketing agent and/or any of the purchasers identified by our marketing agent would not have a long-term material adverse effect on our financial position or results of operations. We have required our marketing agent to post a letter of credit covering the estimated proceeds from our revenue transactions, until such proceeds are received.

Recent Accounting Standards

In December 2011, the FASB issued ASU No. 2011-11, “Disclosures about Offsetting Assets and Liabilities,” to improve reporting and transparency of offsetting (netting) assets and liabilities and the related effects on the financial statements. This ASU is effective for fiscal years and interim periods within those years beginning on or after January 1, 2013. We do not expect the adoption of this ASU will have a material effect on our consolidated financial statements.

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Jubilee Field Unitization (Details) (Jubilee UUOA, USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended	9 Months Ended	1 Months Ended
	Oct. 31, 2011	Dec. 31, 2011	Sep. 30, 2012 Minimum	Oct. 31, 2011 WCTP Block	Jul. 31, 2009 WCTP Block	Oct. 31, 2011 DT Block	Jul. 31, 2009 DT Block
Jubilee field unitization
Initial tract participation for each block (as a percent)					50.00%		50.00%
Percentage participation interest required to call for second redetermination			10.00%
Tract participation for each block after redetermination (as a percent)				54.3666%		45.6334%
Unit interest as previously held (as a percent)	23.50868%
Unit interest after redetermination process (as a percent)	24.0771%
Increase in joint interest billing receivables due to change in participation interest as a result of redetermination process		$ 67.6
Increases in oil and gas properties due to change in participation interest resulting from redetermination process		22.1
Increases in notes receivable due to change in participation interest resulting from redetermination process		2.5
Increases in inventories due to change in participation interest resulting from redetermination process		0.4
Increases in oil and gas production expenses due to change in participation interest from redetermination process		1.6
Increases in general and administrative expenses due to change in participation interest from redetermination process		0.6
Increases in accounts payable due to change in participation interest from redetermination process		$ 94.9

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Accounts Payable and Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2012

Accounts Payable and Accrued Liabilities

Schedule of components of accrued liabilities

	September 30, 2012		December 31, 2011
	(In thousands)
Accrued liabilities:
Accrued exploration, development and production	$	40,212	$	27,666
Accrued general and administrative expenses	11,303		2,159
Accrued taxes other than income	11,252		1,095
Accrued interest	620		1,208
Accrued income taxes	1,306		5,066
	$	64,693	$	37,194

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Suspended Well Costs (Tables)

9 Months Ended

Sep. 30, 2012

Suspended Well Costs

Schedule of capitalized exploratory well costs

	September 30, 2012
	(In thousands)
Beginning balance (January 1, 2012)	$	267,592
Additions to capitalized exploratory well costs pending the determination of proved reserves	104,255
Reclassification due to determination of proved reserves	—
Capitalized exploratory well costs charged to expense	(2,627		)
Ending balance (September 30, 2012)	$	369,220

Schedule of aging of capitalized exploratory well costs and number of projects for which exploratory well costs were capitalized for more than one year

	September 30, 2012		December 31,2011
	(In thousands, except well counts)
Exploratory well costs capitalized for a period of one year or less	$	129,389	$	132,838
Exploratory well costs capitalized for a period one to three years	239,831		134,754
Ending balance	$	369,220	$	267,592
Number of projects with exploratory well costs that have been capitalized for more than one year	7		3

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Equity-based Compensation (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended		16 Months Ended	3 Months Ended	4 Months Ended	9 Months Ended	4 Months Ended				9 Months Ended	16 Months Ended		9 Months Ended	16 Months Ended		9 Months Ended		16 Months Ended		4 Months Ended	9 Months Ended	4 Months Ended		9 Months Ended
	May 31, 2011	Sep. 30, 2012 LTIP	Sep. 30, 2011 LTIP	Sep. 30, 2012 LTIP	Sep. 30, 2011 LTIP	Sep. 30, 2012 LTIP	Sep. 30, 2011 Profit units	May 16, 2011 Profit units	Sep. 30, 2011 Profit units	May 16, 2011 Profit units Minimum	May 16, 2011 Profit units Maximum	May 16, 2011 Profit units Employees	May 16, 2011 Restricted stock awards LTIP	Sep. 30, 2012 Service Vesting Restricted Stock Awards LTIP	Sep. 30, 2012 Market/Service Vesting Restricted Stock Awards Minimum	Sep. 30, 2012 Market/Service Vesting Restricted Stock Awards Maximum	Sep. 30, 2012 Market/Service Vesting Restricted Stock Awards LTIP	Sep. 30, 2012 Market/Service Vesting Restricted Stock Awards LTIP Minimum	Sep. 30, 2012 Market/Service Vesting Restricted Stock Awards LTIP Maximum	Sep. 30, 2012 Service Vesting Restricted Stock Units LTIP	Sep. 30, 2012 Market/Service Vesting Restricted Stock Units LTIP	Sep. 30, 2012 Market/Service Vesting Restricted Stock Units LTIP Maximum	May 16, 2011 Kosmos Energy Holdings	May 16, 2011 Kosmos Energy Holdings Profit units	Sep. 30, 2012 Kosmos Energy Holdings Profit units	May 16, 2011 Kosmos Energy Holdings Profit units Minimum	May 16, 2011 Kosmos Energy Holdings Profit units Maximum	Sep. 30, 2012 Kosmos Energy Holdings Profit units Founding Management and Directors	Sep. 30, 2012 Kosmos Energy Holdings Profit units Employees
Equity-based Compensation
Threshold value to employees, management and directors																										$ 0.85	$ 90
Vesting period																									4 years
Vesting rights as of the date of issuance (as a percent)																												20.00%
Additional vesting rights on the anniversary date for each of the next four years (as a percent)																												20.00%
Vesting rights on the second and fourth anniversary of issuance date (as a percent)																													50.00%
Common units, authorized (in shares)																							100,000,000	15,700,000
Outstanding awards activity
Outstanding at the beginning of the period (in shares)																								13,910,000
Relinquished (in shares)																								(2,503,000)
Outstanding at the end of the period (in shares)																								13,190,000
Weighted-Average Grant-Date Fair Value for awards
Outstanding at beginning of the period (in dollars per share)																								$ 1.76
Relinquished (in dollars per share)																								$ 0.12
Outstanding at the end of the period (in dollars per share)																								$ 3.96
Outstanding unvested awards activity
Unvested profit units exchanged for restricted stock awards (in shares)													10,000,000
Outstanding at the beginning of the period (in shares)														17,195,000			3,522,000							3,464,000
Granted (in shares)														578,000			303,000			983,000	792,000			1,783,000
Forfeited (in shares)						86,000								(852,000)			(155,000)			(23,000)	(17,000)			(1,253,000)
Vested (in shares)														(5,202,000)										(1,066,000)
Outstanding at the end of the period (in shares)														11,719,000			3,670,000			960,000	775,000			2,928,000
Weighted-Average Grant-Date Fair Value
Outstanding at beginning of the period (in dollars per share)														$ 13.36			$ 13.21							$ 1.60
Granted (in dollars per share)														$ 12.06	$ 6.70	$ 13.57	$ 9.45			$ 10.58	$ 15.81			$ 15.71
Forfeited/Relinquished (in dollars per share)														$ 13.77			$ 12.92			$ 10.98	$ 15.81			$ 0.10
Vested (in dollars per share)														$ 9.97										$ 1.09
Outstanding at the end of the period (in dollars per share)														$ 14.77			$ 12.91			$ 10.57	$ 15.81			$ 11.02
Compensation agreement
Compensation expense recognized		$ 19,400,000	$ 20,100,000	$ 58,200,000	$ 28,100,000		$ 0		$ 1,200,000
Significant assumptions used to calculate fair values
Expected volatility (as a percent)										25.00%	66.00%							41.30%	56.70%		54.00%
Risk-free interest rate (as a percent)										1.30%	5.10%							0.50%	1.10%		0.50%
Expected life										1 year 2 months 12 days	8 years 1 month 6 days
Projected turnover rate (as a percent)												7.00%
Number of common shares into which the units were exchanged	277,700,000							31,700,000
Threshold value of awards cancelled								$ 90
Number of shares available for future grant
Approved and authorized awards (in shares)		24,503,000		24,503,000		24,503,000
Awards issued after May 16, 2011 (in shares)						(18,285,000)
Awards available for future grant (in shares)		6,304,000		6,304,000		6,304,000
Vesting percentage of the awards granted																			100.00%			200.00%

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Joint Interest Billings (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			1 Months Ended	3 Months Ended		1 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Dec. 31, 2011	Jul. 31, 2011 WCTP PA WCTP Block	Jun. 30, 2011 EO Group WCTP PA	Jul. 22, 2011 Tullow WCTP PA	Jul. 31, 2011 Jubilee Field	Jul. 31, 2011 Jubilee Field GNPC
Joint interest billings
Current joint interest billings		$ 113,946	$ 199,699
Working interest acquired in EO Group (as a percent)						3.50%
Reversal of valuation allowance for long-term joint interest billing receivables related to Jubilee Field development costs	$ 39,782				$ 39,800
Increase in the participation interest in the Jubilee Unit (as a percent)							0.01738%
GNPC's paying interest								3.75%
Working interest (as a percent)				30.875%

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Debt (Tables)

9 Months Ended

Sep. 30, 2012

Debt

Schedule of maturities of debt

	Payments Due by Year
	2012 (1)		2013		2014		2015		2016		Thereafter
	(In thousands)
Commercial debt facility(2)	$	—	$	—	$	—	$	—	$	444,444	$	555,556

(1)   Represents payments for the period October 1, 2012 through December 31, 2012.

(2)The scheduled maturities of debt are based on the level of borrowings and the available borrowing base as of September 30, 2012. Any increases or decreases in the level of borrowings or decreases in the available borrowing base would impact the scheduled maturities of debt during the five year period and thereafter.

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Derivative Financial Instruments

Schedule of oil derivative contracts

			Weighted Average Price per Bbl
Term(1)	Type of Contract	MBbl	Deferred Premium		Swaps		Floor		Ceiling		Calls
2012:
October - December	Purchased puts	426	$	6.86	$	—	$	61.48	$	—	$	—
October - December	Swaps with calls	600	—		97.21		—		—		110.00
2013:
January - December	Three-way collars	1,500	$	4.82	$	—	$	95.00	$	105.00	$	125.00
January - December	Three-way collars	1,004	—		—		87.50		115.00		135.00

(1)In October 2012, we entered into costless three-way collar contracts for 1.0 MMBbl from January 2013 through December 2013 with a floor price of $90.00 per Bbl, a weighted average ceiling price of $115.39 per Bbl and a call price of $135.00 per Bbl. The three-way collar contracts are indexed to Dated Brent prices.

Schedule of interest rate swaps derivative contracts

Term	Weighted Average Notional Amount		Weighted Average Fixed Rate		Floating Rate
	(In thousands)
October 2012 — December 2012	$	306,420	1.98	%	6-month LIBOR
January 2013 — December 2013		227,103	2.06	%	6-month LIBOR
January 2014 — December 2014		133,434	1.99	%	6-month LIBOR
January 2015 — December 2015		45,319	2.03	%	6-month LIBOR
January 2016 — June 2016		12,500	2.27	%	6-month LIBOR

Schedule of derivative instruments by balance sheet location

		Estimated Fair Value
		Asset (Liability)
		September 30,			December 31,
Type of Contract	Balance Sheet Location	2012			2011
		(In thousands)
Derivatives not designated as hedging instruments:
Derivative asset:
Commodity	Derivatives assets — current	$	3,185		$	—
Derivative liability:
Commodity(1)(2)	Derivatives liabilities — current	(20,306		)	(20,303		)
Interest rate	Derivatives liabilities — current	(4,416		)	(4,104		)
Commodity(3)	Derivatives liabilities — long-term	(2,715		)	(4,457		)
Interest rate	Derivatives liabilities — long-term	(3,379		)	(3,970		)
Total derivatives not designated as hedging instruments		$	(27,631	)	$	(32,834	)

(1)Includes $3.5 million and $3.2 million, as of September 30, 2012 and December 31, 2011, of cash settlements made on our purchased puts and swaps with calls which were settled in the month subsequent to period end.

(2)Includes deferred premiums of $8.7 million related to various purchased puts and three-way collar contracts.

(3)Includes deferred premiums of $2.4 million related to three-way collar contracts.

Schedule of derivative instruments by location of gain/(loss)

		Amount of Gain/(Loss)						Amount of Gain/(Loss)
		Three Months Ended September 30,						Nine months Ended September 30,
Type of Contract	Location of Gain/(Loss)	2012			2011			2012			2011
		(In thousands)
Derivatives in cash flow hedging relationships:
Interest rate(1)	Interest expense	$	133		$	(1,193	)	$	(295	)	$	(2,934	)
Total derivatives in cash flow hedging relationships		$	133		$	(1,193	)	$	(295	)	$	(2,934	)
Derivatives not designated as hedging instruments:
Commodity(2)	Oil and gas revenue	$	11,494		$	1,320		$	15,221		$	1,171
Commodity	Derivatives, net	(24,529		)	4,984			(26,407		)	(5,250		)
Interest rate	Interest expense	(931		)	(3,921		)	(2,366		)	(9,933		)
Total derivatives not designated as hedging instruments		$	(13,966	)	$	2,383		$	(13,552	)	$	(14,012	)

(1)Amounts were reclassified from AOCI into earnings.

(2)Amounts represent the mark-to-market portion of our provisional oil sales contracts.

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Organization

9 Months Ended

Sep. 30, 2012

Organization

Organization

1. Organization

Kosmos Energy Ltd. was incorporated pursuant to the laws of Bermuda in January 2011 to become a holding company for Kosmos Energy Holdings. Kosmos Energy Holdings is a privately held Cayman Islands company that was formed March 5, 2004. As a holding company, Kosmos Energy Ltd.’s management operations are conducted through a wholly owned subsidiary, Kosmos Energy, LLC. The terms “Kosmos,” the “Company,” “we,” “us,” “our,” “ours,” and similar terms when used in the present tense or prospectively or for historical periods since May 16, 2011 refer to Kosmos Energy Ltd. and its wholly owned subsidiaries and for historical periods prior to May 16, 2011 refer to Kosmos Energy Holdings and its wholly owned subsidiaries, unless the context indicates otherwise.

We are an independent oil and gas exploration and production company currently focused on frontier and emerging areas in Africa and South America. Our asset portfolio includes existing production, discoveries and exploration prospects offshore Ghana, as well as petroleum contracts offshore Mauritania, Morocco and Suriname and onshore Cameroon. Kosmos Energy Ltd. transitioned from its development stage to operational activities in January 2011. Accordingly, reporting as a development stage company is no longer deemed necessary.

In May 2012, Kosmos entered into an agreement with Chevron Global Energy Inc. (“Chevron”) under which Kosmos will assign half of its interest in Block 42 and Block 45, offshore Suriname, to Chevron. Upon receipt of approval from the Suriname government and the closing of the agreement, each party will have a 50% working interest in Block 42 and Block 45.

We have one business segment, which is the exploration and production of oil and natural gas. Substantially all of our long-lived assets and product sales are related to production located offshore Ghana.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measurements

Schedule of Company's assets and liabilities that are measured at fair value on a recurring basis

	Fair Value Measurements Using:
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
	(Level 1)		(Level 2)			(Level 3)		Total
	(In thousands)
September 30, 2012
Assets:
Money market accounts	$	271,270	$	—		$	—	$	271,270
Commodity derivatives	—		3,185			—		3,185
Liabilities:
Commodity derivatives	—		(23,021		)	—		(23,021		)
Interest rate derivatives	—		(7,795		)	—		(7,795		)
Total	$	271,270	$	(27,631	)	$	—	$	243,639
December 31, 2011
Assets:
Money market accounts(1)	$	489,761	$	—		$	—	$	489,761
Liabilities:
Commodity derivatives	—		(24,760		)	—		(24,760		)
Interest rate derivatives	—		(8,074		)	—		(8,074		)
Total	$	489,761	$	(32,834	)	$	—	$	456,927

(1)As reported in our annual report on Form 10-K, the Level 1 fair value measurements excluded $27.5 million of restricted cash. The table above has been revised to properly include this amount.

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Accounting Policies (Details 2)	9 Months Ended
	Sep. 30, 2012
Minimum
Depreciation and amortization
Estimated useful lives (in years)	3 years
Maximum
Depreciation and amortization
Estimated useful lives (in years)	8 years
Leasehold improvements | Minimum
Depreciation and amortization
Estimated useful lives (in years)	6 years
Leasehold improvements | Maximum
Depreciation and amortization
Estimated useful lives (in years)	8 years
Office furniture, fixtures and computer equipment | Minimum
Depreciation and amortization
Estimated useful lives (in years)	3 years
Office furniture, fixtures and computer equipment | Maximum
Depreciation and amortization
Estimated useful lives (in years)	7 years
Vehicles
Depreciation and amortization
Estimated useful lives (in years)	5 years
Capitalized interest | Minimum
Capitalized Interest
Expected construction period for capitalization of interest costs on major projects	1 year

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Fair Value Measurements (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Interest rate derivatives
Liabilities:
Decrease in fair value of derivative liabilities attributable to nonperformance risk	$ 200,000
Notional amount	306,400,000
Commodity derivatives
Liabilities:
Decrease in fair value of derivative liabilities attributable to nonperformance risk	500,000
Recurring basis | Level 1
Assets:
Money market accounts	271,270,000	489,761,000
Liabilities:
Total fair value, net	271,270,000	489,761,000
Amount of money market accounts excluded from fair value measurements, as reported in our annual report on Form 10-K		27,500,000
Recurring basis | Level 2
Liabilities:
Total fair value, net	(27,631,000)	(32,834,000)
Recurring basis | Level 2 | Interest rate derivatives
Liabilities:
Derivative liability, fair value	(7,795,000)	(8,074,000)
Recurring basis | Level 2 | Commodity derivatives
Assets:
Derivative asset, fair value	3,185,000
Liabilities:
Derivative liability, fair value	(23,021,000)	(24,760,000)
Recurring basis | Total
Assets:
Money market accounts	271,270,000	489,761,000
Liabilities:
Total fair value, net	243,639,000	456,927,000
Amount of money market accounts excluded from fair value measurements, as reported in our annual report on Form 10-K		27,500,000
Recurring basis | Total | Interest rate derivatives
Liabilities:
Derivative liability, fair value	(7,795,000)	(8,074,000)
Recurring basis | Total | Commodity derivatives
Assets:
Derivative asset, fair value	3,185,000
Liabilities:
Derivative liability, fair value	$ (23,021,000)	$ (24,760,000)

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 399,650	$ 673,092
Restricted cash	21,336	23,747
Receivables:
Joint interest billings	113,946	199,699
Oil sales	106,561	109,475
Other	1,560	981
Inventories	37,992	27,101
Prepaid expenses and other	9,801	13,913
Current deferred tax assets	48,040	64,473
Derivatives	3,185
Total current assets	742,071	1,112,481
Property and equipment:
Oil and gas properties, net of accumulated depletion of $262,698 and $135,622, respectively	1,474,696	1,367,265
Other property, net of accumulated depreciation of $10,614 and $8,068, respectively	15,704	9,776
Property and equipment, net	1,490,400	1,377,041
Other assets:
Restricted cash	29,300	3,800
Deferred financing costs, net of accumulated amortization of $13,164 and $6,582, respectively	48,639	54,847
Long-term deferred tax assets	8,750	3,765
Total assets	2,319,160	2,551,934
Current liabilities:
Accounts payable	128,231	278,006
Accrued liabilities	64,693	37,194
Derivatives	24,722	24,407
Total current liabilities	217,646	339,607
Long-term liabilities:
Long-term debt	1,000,000	1,110,000
Derivatives	6,094	8,427
Asset retirement obligations	22,662	20,670
Deferred tax liability	88,027	47,608
Other long-term liabilities	12,507	4,896
Total long-term liabilities	1,129,290	1,191,601
Shareholders' equity:
Preference shares, $0.01 par value; 200,000,000 authorized shares; zero issued at September 30, 2012 and December 31, 2011
Common shares, $0.01 par value; 2,000,000,000 authorized shares; 391,411,703 and 390,530,946 issued at September 30, 2012 and December 31, 2011, respectively	3,914	3,905
Additional paid-in capital	1,687,669	1,629,453
Accumulated deficit	(714,782)	(616,148)
Accumulated other comprehensive income	3,817	3,522
Treasury stock, at cost, 2,454,279 and 649,818 shares at September 30, 2012 and December 31, 2011, respectively	(8,394)	(6)
Total shareholders' equity	972,224	1,020,726
Total liabilities and shareholders' equity	$ 2,319,160	$ 2,551,934

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Property and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Oil and gas properties:
Proved properties	$ 696,047,000		$ 696,047,000		$ 607,338,000
Unproved properties	429,552,000		429,552,000		294,701,000
Support equipment and facilities	611,795,000		611,795,000		600,848,000
Total oil and gas properties	1,737,394,000		1,737,394,000		1,502,887,000
Less: accumulated depletion	(262,698,000)		(262,698,000)		(135,622,000)
Oil and gas properties, net	1,474,696,000		1,474,696,000		1,367,265,000
Other property, net	15,704,000		15,704,000		9,776,000
Property and equipment, net	1,490,400,000		1,490,400,000		1,377,041,000
Depletion expense	61,900,000	41,300,000	123,300,000	85,400,000
Depletion costs included in crude oil inventory and other receivables	$ 3,900,000		$ 3,900,000

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Shares	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock
Balance at Dec. 31, 2011	$ 1,020,726	$ 3,905	$ 1,629,453	$ (616,148)	$ 3,522	$ (6)
Balance (in shares) at Dec. 31, 2011		390,531
Increase (Decrease) in Shareholders' Equity
Equity-based compensation	58,215		58,215
Derivatives, net	295				295
Restricted stock awards		9	(9)
Restricted stock awards (in shares)		881
Restricted stock forfeitures			10			(10)
Purchase of treasury stock	(8,378)					(8,378)
Net loss	(98,634)			(98,634)
Balance at Sep. 30, 2012	$ 972,224	$ 3,914	$ 1,687,669	$ (714,782)	$ 3,817	$ (8,394)
Balance (in shares) at Sep. 30, 2012		391,412

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Income Taxes

Schedule of components of income (loss) before income taxes

	Three Months Ended September 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
	(In thousands)
Bermuda	$	(2,316	)	$	5,945	$	(8,735	)	$	(2,901	)
United States	3,145			3,430		9,492			4,239
Foreign—other	(11,156		)	92,882		(34,661		)	35,201
Income (loss) before income taxes	$	(10,327	)	$	102,257	$	(33,904	)	$	36,539

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Income Taxes

9 Months Ended

Sep. 30, 2012

Income Taxes

Income Taxes

15. Income Taxes

The income tax expense was $25.9 million and $50.5 million for the three months ended September 30, 2012 and 2011, respectively, and was $64.7 million and $48.5 million for the nine months ended September 30, 2012 and 2011, respectively. The income tax provision consists of U.S. and Ghanaian income and Texas margin taxes.

The components of income (loss) before income taxes were as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
	(In thousands)
Bermuda	$	(2,316	)	$	5,945	$	(8,735	)	$	(2,901	)
United States	3,145			3,430		9,492			4,239
Foreign—other	(11,156		)	92,882		(34,661		)	35,201
Income (loss) before income taxes	$	(10,327	)	$	102,257	$	(33,904	)	$	36,539

Our effective tax rate for the three months ended September 30, 2012 and 2011 was (251)% and 49%, respectively. For the nine months ended September 30, 2012 and 2011 our effective tax rate was (191)% and 133%. The effective tax rate for the United States is approximately 43% and 35% for the three months ended September 30, 2012 and 2011, respectively, and 116% and 36% for the nine months ended September 30, 2012 and 2011, respectively. The increase in the effective tax rate in the United States resulted from the difference between the amount deductible on our tax return for vested stock awards and the amount of cumulative compensation cost recognized for accounting purposes. The effective tax rate for Ghana ranges from 32% to 39% for all periods presented. The effective tax rate for our other foreign jurisdictions is 0%. Our other foreign jurisdictions have a 0% effective tax rate because they reside in countries with a 0% statutory rate, or we have experienced losses in those countries and have a full valuation allowance reserved against the corresponding net deferred tax assets.

The Company has no material unrecognized income tax benefits.

A subsidiary of the Company files a U.S. federal income tax return and a Texas margin tax return. In addition to the United States, the Company files income tax returns in the countries in which we operate. The Company is open to U.S. federal income tax examinations for tax years 2009 through 2011 and to Texas margin tax examinations for the tax years 2007 through 2011. In addition, the Company is open to income tax examinations for tax years as early as 2004 in its significant foreign jurisdictions (Ghana, Cameroon and Morocco).

The Company’s policy is to recognize interest and penalties related to income tax matters in income tax expense if they are considered probable, but has had no need to accrue any to date.

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Net Income (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Net Income (Loss) Per Share

Schedule of calculation of the numerator and denominator used in earnings per share and pro forma earnings per share

	Three Months EndedSeptember 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
	(In thousands, except per share data)
Numerator:
Net income (loss) attributable to common shareholders	$	(36,250	)	$	51,776	$	(98,634	)	$	(36,408	)
Less: Basic income allocable to participating securities(1)	—			2,349		—			—
Basic net income (loss) attributable to common shareholders	(36,250		)	49,427		(98,634		)
Plus: Accretion to redemption value of convertible preferred units	—			—		—			24,442
Pro forma basic net loss attributable to common shareholders	—			—		—			(11,966		)
Diluted adjustments to income allocable to participating securities(1)	—			3		—			—
Diluted net income (loss) attributable to common shareholders	$	(36,250	)	$	49,430	$	(98,634	)
Pro forma diluted net loss attributable to common shareholders									$	(11,966	)
Denominator:
Weighted average number of shares used to compute net income (loss) per share:
Basic	373,448			368,996		371,140
Restricted stock awards(1)(2)	—			345		—
Diluted	373,448			369,341		371,140
Pro forma basic									349,792
Pro forma restricted stock awards(1)(2)									—
Pro forma diluted									349,792
Net income (loss) per share attributable to common shareholders:
Basic	$	(0.10	)	$	0.13	$	(0.27	)
Diluted	$	(0.10	)	$	0.13	$	(0.27	)
Pro forma basic									$	(0.03	)
Pro forma diluted									$	(0.03	)

(1)Our service vesting restricted stock awards represent participating securities because they participate in nonforfeitable dividends with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Our restricted stock awards with market and service vesting criteria and all restricted stock units are not considered to be participating securities and, therefore, are excluded from the basic net income (loss) per common share calculation. Our service vesting restricted stock awards do not participate in undistributed net losses and, therefore, are excluded from the basic net income (loss) per common share calculation in periods we are in a net loss position.

(2)Due to our basic net loss attributable to common shareholders for the three and nine months ended September 30, 2012, we excluded 17.1 million outstanding restricted stock awards and restricted stock units from the computations of diluted net loss per share because the effect would have been anti-dilutive. Due to our basic net loss attributable to common shareholders for the nine months ended September 30, 2011, we excluded 13.6 million outstanding restricted stock awards from the computations of pro forma diluted net loss per share because the effect would have been anti-dilutive.  For the three months ended September 30, 2011, we excluded 5.5 million outstanding restricted stock awards from the computations of diluted net income per share because the effect would have been anti-dilutive.

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Contingencies

9 Months Ended

Sep. 30, 2012

Contingencies

Contingencies

17. Contingencies

We are involved in litigation, regulatory examinations and administrative proceedings primarily arising in the ordinary course of our business in jurisdictions in which we do business. Although the outcome of these matters cannot be predicted with certainty, management believes none of these matters, either individually or in the aggregate, would have a material effect upon the Company’s financial statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Operating activities
Net loss	$ (98,634)	$ (11,966)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depletion, depreciation and amortization	135,024	102,959
Deferred income taxes	51,867	37,176
Unsuccessful well costs	19,357	87,845
Non-cash change in fair value of derivatives	13,847	16,946
Cash settlements on derivatives	(18,755)	(4,779)
Equity-based compensation	58,215	29,264
Doubtful accounts expense		(39,782)
Loss on extinguishment of debt		59,643
Other	7,739	1,939
Changes in assets and liabilities:
(Increase) decrease in receivables	89,102	(40,279)
(Increase) decrease in inventories	(7,812)	2,126
(Increase) decrease in prepaid expenses and other	4,112	(2,455)
Increase (decrease) in accounts payable	(127,025)	33,729
Increase (decrease) in accrued liabilities	23,073	(5,220)
Net cash provided by operating activities	150,110	267,146
Investing activities
Oil and gas assets	(272,681)	(282,098)
Other property	(9,030)	(1,928)
Notes receivable		4,448
Restricted cash	(23,089)	85,551
Net cash used in investing activities	(304,800)	(194,027)
Financing activities
Borrowings under long-term debt		1,393,000
Payments on long-term debt	(110,000)	(1,438,000)
Net proceeds from the initial public offering		580,374
Purchase of treasury stock	(8,378)
Deferred financing costs	(374)	(52,466)
Net cash provided by (used in) financing activities	(118,752)	482,908
Net increase (decrease) in cash and cash equivalents	(273,442)	556,027
Cash and cash equivalents at beginning of period	673,092	100,415
Cash and cash equivalents at end of period	399,650	656,442
Cash paid for:
Interest	30,247	36,854
Income taxes	$ 16,620	$ 850

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS
Oil and gas properties, accumulated depletion (in dollars)	$ 262,698	$ 135,622
Other property, accumulated depreciation (in dollars)	10,614	8,068
Deferred financing costs, accumulated amortization (in dollars)	$ 13,164	$ 6,582
Preference shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preference shares, authorized shares	200,000,000	200,000,000
Preference shares, issued shares	0	0
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized shares	2,000,000,000	2,000,000,000
Common shares, issued shares	391,411,703	390,530,946
Treasury stock, shares	2,454,279	649,818

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2012

Derivative Financial Instruments

Derivative Financial Instruments

10. Derivative Financial Instruments

We use financial derivative contracts to manage exposures to commodity price and interest rate fluctuations. We do not hold or issue derivative financial instruments for trading purposes.

We apply the provisions of ASC 815—Derivatives and Hedging, which require each derivative instrument to be recorded in the balance sheet at fair value. If a derivative has not been designated as a hedge or does not otherwise qualify for hedge accounting, it must be adjusted to fair value through earnings. We do not apply hedge accounting treatment to our oil derivative contracts and, therefore, the changes in the fair values of these instruments are recognized in earnings in the period the change occurred. These fair value changes are shown in our consolidated statements of operations.

Effective June 1, 2010, we discontinued hedge accounting on all interest rate derivative instruments. Therefore, from that date forward, changes in the fair value of the instruments are recognized in earnings during the period of change. The effective portions of the discontinued hedges as of May 31, 2010, are included in accumulated other comprehensive income or loss (“AOCI”) in the equity section of the accompanying consolidated balance sheets, and are being transferred to earnings when the hedged transaction settles.

Oil Derivative Contracts

We enter into various oil derivative contracts to mitigate our exposure to commodity price risk associated with anticipated future oil production. These contracts currently consist of purchased puts, swaps with calls and three-way collars.

We manage market and counterparty credit risk in accordance with our policies and guidelines. In accordance with these policies and guidelines, our management determines the appropriate timing and extent of derivative transactions. We have included an estimate of nonperformance risk in the fair value measurement of our commodity derivative contracts as required by ASC 820—Fair Value Measurements and Disclosures.

The following table sets forth the volumes in barrels underlying the Company’s outstanding oil derivative contracts and the weighted average Dated Brent prices per Bbl for those contracts as of September 30, 2012.

			Weighted Average Price per Bbl
Term(1)	Type of Contract	MBbl	Deferred Premium		Swaps		Floor		Ceiling		Calls
2012:
October - December	Purchased puts	426	$	6.86	$	—	$	61.48	$	—	$	—
October - December	Swaps with calls	600	—		97.21		—		—		110.00
2013:
January - December	Three-way collars	1,500	$	4.82	$	—	$	95.00	$	105.00	$	125.00
January - December	Three-way collars	1,004	—		—		87.50		115.00		135.00

(1)In October 2012, we entered into costless three-way collar contracts for 1.0 MMBbl from January 2013 through December 2013 with a floor price of $90.00 per Bbl, a weighted average ceiling price of $115.39 per Bbl and a call price of $135.00 per Bbl. The three-way collar contracts are indexed to Dated Brent prices.

Provisional Oil Sales

At September 30, 2012, we had sales volumes of 995 MBbl priced at an average of $110.28 per bbl, after differentials, which are subject to final pricing over the next month.

Interest Rate Swaps Derivative Contracts

The following table summarizes our open interest rate swaps as of September 30, 2012:

Term	Weighted Average Notional Amount		Weighted Average Fixed Rate		Floating Rate
	(In thousands)
October 2012 — December 2012	$	306,420	1.98	%	6-month LIBOR
January 2013 — December 2013		227,103	2.06	%	6-month LIBOR
January 2014 — December 2014		133,434	1.99	%	6-month LIBOR
January 2015 — December 2015		45,319	2.03	%	6-month LIBOR
January 2016 — June 2016		12,500	2.27	%	6-month LIBOR

Effective June 1, 2010, the Company discontinued hedge accounting on all existing interest rate derivative instruments. Prior to June 1, 2010, any ineffectiveness on the interest rate swaps was immaterial; therefore, no amount was recorded in earnings for ineffectiveness. We have included an estimate of nonperformance risk in the fair value measurement of our interest rate derivative contracts as required by ASC 820—Fair Value Measurements and Disclosures.

The following tables disclose the Company’s derivative instruments as of September 30, 2012 and December 31, 2011:

		Estimated Fair Value
		Asset (Liability)
		September 30,			December 31,
Type of Contract	Balance Sheet Location	2012			2011
		(In thousands)
Derivatives not designated as hedging instruments:
Derivative asset:
Commodity	Derivatives assets — current	$	3,185		$	—
Derivative liability:
Commodity(1)(2)	Derivatives liabilities — current	(20,306		)	(20,303		)
Interest rate	Derivatives liabilities — current	(4,416		)	(4,104		)
Commodity(3)	Derivatives liabilities — long-term	(2,715		)	(4,457		)
Interest rate	Derivatives liabilities — long-term	(3,379		)	(3,970		)
Total derivatives not designated as hedging instruments		$	(27,631	)	$	(32,834	)

(1)Includes $3.5 million and $3.2 million, as of September 30, 2012 and December 31, 2011, of cash settlements made on our purchased puts and swaps with calls which were settled in the month subsequent to period end.

(2)Includes deferred premiums of $8.7 million related to various purchased puts and three-way collar contracts.

(3)Includes deferred premiums of $2.4 million related to three-way collar contracts.

		Amount of Gain/(Loss)						Amount of Gain/(Loss)
		Three Months Ended September 30,						Nine months Ended September 30,
Type of Contract	Location of Gain/(Loss)	2012			2011			2012			2011
		(In thousands)
Derivatives in cash flow hedging relationships:
Interest rate(1)	Interest expense	$	133		$	(1,193	)	$	(295	)	$	(2,934	)
Total derivatives in cash flow hedging relationships		$	133		$	(1,193	)	$	(295	)	$	(2,934	)
Derivatives not designated as hedging instruments:
Commodity(2)	Oil and gas revenue	$	11,494		$	1,320		$	15,221		$	1,171
Commodity	Derivatives, net	(24,529		)	4,984			(26,407		)	(5,250		)
Interest rate	Interest expense	(931		)	(3,921		)	(2,366		)	(9,933		)
Total derivatives not designated as hedging instruments		$	(13,966	)	$	2,383		$	(13,552	)	$	(14,012	)

(1)Amounts were reclassified from AOCI into earnings.

(2)Amounts represent the mark-to-market portion of our provisional oil sales contracts.

The fair value of the effective portion of the derivative contracts on May 31, 2010, is reflected in AOCI and is being transferred to interest expense over the remaining term of the contracts. In accordance with the mark-to-market method of accounting, the Company recognizes changes in fair values of its derivative contracts as gains or losses in earnings during the period in which they occur. The Company expects to reclassify $1.3 million of gains from AOCI to interest expense within the next 12 months. See
Note 11—Fair Value Measurements for additional information regarding the Company’s derivative instruments.

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Document and Entity Information	9 Months Ended
	Sep. 30, 2012	Oct. 31, 2012
Document and Entity Information
Entity Registrant Name	Kosmos Energy Ltd.
Entity Central Index Key	0001509991
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		388,937,188
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3

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Fair Value Measurements

9 Months Ended

Sep. 30, 2012

Fair Value Measurements

Fair Value Measurements

11. Fair Value Measurements

In accordance with ASC 820—Fair Value Measurements and Disclosures, fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are classified into two categories: observable inputs and unobservable inputs. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect a company’s own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. We prioritize the inputs used in measuring fair value into the following fair value hierarchy:

·Level 1—quoted prices for identical assets or liabilities in active markets.

·Level 2—quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs derived principally from or corroborated by observable market data by correlation or other means.

·Level 3—unobservable inputs for the asset or liability.

The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety.

The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2012 and December 31, 2011, for each fair value hierarchy level:

	Fair Value Measurements Using:
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
	(Level 1)		(Level 2)			(Level 3)		Total
	(In thousands)
September 30, 2012
Assets:
Money market accounts	$	271,270	$	—		$	—	$	271,270
Commodity derivatives	—		3,185			—		3,185
Liabilities:
Commodity derivatives	—		(23,021		)	—		(23,021		)
Interest rate derivatives	—		(7,795		)	—		(7,795		)
Total	$	271,270	$	(27,631	)	$	—	$	243,639
December 31, 2011
Assets:
Money market accounts(1)	$	489,761	$	—		$	—	$	489,761
Liabilities:
Commodity derivatives	—		(24,760		)	—		(24,760		)
Interest rate derivatives	—		(8,074		)	—		(8,074		)
Total	$	489,761	$	(32,834	)	$	—	$	456,927

(1)As reported in our annual report on Form 10-K, the Level 1 fair value measurements excluded $27.5 million of restricted cash. The table above has been revised to properly include this amount.

All fair values have been adjusted for nonperformance risk resulting in a decrease of the commodity derivative liabilities of approximately $0.5 million and a decrease of the interest rate derivatives of approximately of $0.2 million as of September 30, 2012. When the accumulated net present value for all of the derivative contracts with a counterparty is in an asset position, the Company uses the counterparty’s credit default swap (“CDS”) rates to estimate non-performance risk. When the accumulated net present value for all derivative contracts for a counterparty are in a liability position, we use our internal rate of borrowing to estimate our non-performance risk.

The book values of cash and cash equivalents and restricted cash approximate fair value based on Level 1 inputs. Joint interest billings, oil sales and other receivables, and accounts payable and accrued liabilities approximate fair value due to the short-term nature of these instruments. The carrying values of our debt approximates fair value since they are subject to short-term floating interest rates that approximate the rates available to us for those periods. Our long-term receivables, if any, after any allowances for doubtful accounts approximate fair value. The estimates of fair value of these items are based on Level 2 inputs.

Commodity Derivatives

Our commodity derivatives represent crude oil purchased puts, swaps with calls and three-way collars for notional barrels of oil at fixed Dated Brent oil prices. The values attributable to the our oil derivatives are based on (i) the contracted notional volumes, (ii) independent active futures price quotes for Dated Brent, (iii) a credit-adjusted yield curve applicable to each counterparty by reference to the CDS market and (iv) an independently sourced estimate of volatility for Dated Brent. The volatility estimate was provided by certain independent brokers who are active in buying and selling oil options and was corroborated by market-quoted volatility factors. The deferred premium is included in the fair market value of the puts and compound options. See Note 10—Derivative Financial Instruments for additional information regarding the Company’s derivative instruments.

Provisional Oil Sales

The value attributable to the provisional oil sales derivative is based on (i) the sales volumes subject to provisional pricing and (ii) an independently sourced forward curve over the term of the provisional pricing period.

Interest Rate Derivatives

As of September 30, 2012, we had interest rate swaps with notional amounts of $306.4 million, whereby the Company pays a fixed rate of interest and the counterparty pays a variable LIBOR-based rate. The values attributable to the Company’s interest rate derivative contracts are based on (i) the contracted notional amounts, (ii) LIBOR yield curves provided by independent third parties and corroborated with forward active market-quoted LIBOR yield curves and (iii) a credit-adjusted yield curve as applicable to each counterparty by reference to the CDS market.

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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues and other income:
Oil and gas revenue	$ 222,375	$ 230,262	$ 450,360	$ 446,914
Interest income	137	2,492	1,165	7,459
Other income	725	91	930	735
Total revenues and other income	223,237	232,845	452,455	455,108
Costs and expenses:
Oil and gas production	44,873	24,185	71,791	58,481
Exploration expenses	37,359	11,005	93,904	104,657
General and administrative	40,666	39,093	114,788	72,140
Depletion and depreciation	63,794	42,593	128,442	88,960
Amortization - deferred financing costs	2,194	2,194	6,582	13,999
Interest expense	20,213	16,581	43,717	55,239
Derivatives, net	24,529	(4,984)	26,407	5,250
Loss on extinguishment of debt				59,643
Doubtful accounts expense				(39,782)
Other expenses, net	(64)	(79)	728	(18)
Total costs and expenses	233,564	130,588	486,359	418,569
Income (loss) before income taxes	(10,327)	102,257	(33,904)	36,539
Income tax expense	25,923	50,481	64,730	48,505
Net income (loss)	(36,250)	51,776	(98,634)	(11,966)
Accretion to redemption value of convertible preferred units				(24,442)
Net income (loss) attributable to common shareholders/unit holders	$ (36,250)	$ 51,776	$ (98,634)	$ (36,408)
Net income (loss) per share attributable to common shareholders:
Basic (in dollars per share)	$ (0.10)	$ 0.13	$ (0.27)
Diluted (in dollars per share)	$ (0.10)	$ 0.13	$ (0.27)
Pro forma basic (in dollars per share)				$ (0.03)
Pro forma diluted (in dollars per share)				$ (0.03)
Weighted average number of shares used to compute net income (loss) per share:
Basic (in shares)	373,448	368,996	371,140
Diluted (in shares)	373,448	369,341	371,140
Pro forma basic (in shares)				349,792
Pro forma diluted (in shares)				349,792

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Joint Interest Billings

9 Months Ended

Sep. 30, 2012

Joint Interest Billings

Joint Interest Billings

5. Joint Interest Billings

The Company’s joint interest billings consist of receivables from partners with interests in common oil and gas properties operated by the Company. Joint interest billings are classified on the face of the consolidated balance sheets as current receivables based on when collection is expected to occur. As of September 30, 2012 and December 31, 2011, we had $113.9 million and $199.7 million, respectively, included in current joint interest billings receivable.

EO Group’s share of costs under the WCTP PA incurred attributable to its WCTP Block interest were paid by Kosmos until first production. EO Group was required to reimburse Kosmos for all development costs paid on EO Group’s behalf upon commencement of production in 2010.

On July 22, 2011, Tullow acquired EO Group’s entire 3.5% interest in the WCTP PA, including the correlative interest in the Jubilee Unit. As a result of the transaction, we received full repayment of the long-term joint interest billing receivable related to Jubilee Field development costs we paid on EO Group’s behalf. The related valuation allowance of $39.8 million was reversed during the second quarter of 2011. In addition, our participation interest in the Jubilee Unit increased 0.01738%. This resulted from the elimination of EO Group’s carry by the other Jubilee owners of Ghana National Petroleum Corporation’s (“GNPC”) additional paying interest of 3.75% in the Jubilee Unit. Our working interest in the remainder of the WCTP Block was not changed by the transaction and remains 30.875% (before giving effect to GNPC’s optional additional paying interest).

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Jubilee Field Unitization

9 Months Ended

Sep. 30, 2012

Jubilee Field Unitization

Jubilee Field Unitization

4. Jubilee Field Unitization

The Jubilee Field in Ghana covers an area within both the West Cape Three Points (“WCTP”) and Deepwater Tano (“DT”) Blocks. Consistent with the Ghanaian Petroleum Law, the WCTP and DT Petroleum Agreements (“PAs”) and as required by Ghana’s Ministry of Energy, it was agreed the Jubilee Field would be unitized for optimal resource recovery. Kosmos and its partners negotiated a comprehensive unit operating agreement, the Jubilee UUOA, to unitize the Jubilee Field and govern each party’s respective rights and duties in the Jubilee Unit. The Jubilee UUOA was executed by all parties and was effective July 16, 2009. The tract participations were 50% for each block. Tullow is the Unit Operator, and Kosmos is the Technical Operator for the development of the Jubilee Field. Pursuant to the terms of the Jubilee UUOA, the tract participations are subject to a process of redetermination. The initial redetermination process was completed on October 14, 2011. Any party to the Jubilee UUOA with more than a 10% Jubilee Unit Interest may call for a second redetermination after December 1, 2013. As a result of the initial redetermination process, the tract participation was determined to be 54.36660% for the WCTP Block and 45.63340% for the DT Block. Our Unit Interest was increased from 23.50868% (our percentage after Tullow’s acquisition of EO Group Limited (“EO Group”) — see Note 5—Joint Interest Billings) to 24.07710%. The consolidated financial statements are based on these re-determined tract participations. As a result of the change in our Unit Interest, we recorded increases in joint interest billings receivables, oil and gas properties, notes receivable, inventories, oil and gas production expenses and general and administrative expenses of $67.6 million, $22.1 million, $2.5 million, $0.4 million, $1.6 million and $0.6 million, respectively, and an increase of $94.9 million in accounts payable as of December 31, 2011. Our capital costs related to the increased Unit Interest was paid during 2012. Although the Jubilee Field is unitized, our working interest in each block outside the Jubilee Unit area did not change. We remain operator of the WCTP Block outside the Jubilee Unit area.

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Net Income (Loss) Per Share

9 Months Ended

Sep. 30, 2012

Net Income (Loss) Per Share

Net Income (Loss) Per Share

16. Net Income (Loss) Per Share

In the calculation of basic net income (loss) per common share attributable to common shareholders, participating securities are allocated earnings based on actual dividend distributions received plus a proportionate share of undistributed net income attributable to common shareholders, if any, after recognizing distributed earnings. The Company’s participating securities do not participate in undistributed net losses because they are not contractually obligated to do so. The computation of diluted net income (loss) per share attributable to common shareholders reflects the potential dilution that could occur if securities or other contracts to issue common shares that are dilutive were exercised or converted into common shares or resulted in the issuance of common shares that would then share in the earnings of the Company. During periods in which the Company realizes a loss from continuing operations attributable to common shareholders, securities would not be dilutive to net loss per share and conversion into common shares is assumed not to occur. Diluted net income (loss) per share attributable to common shareholders is calculated under both the two-class method and the treasury stock method and the more dilutive of the two calculations is presented.

Basic net income (loss) per share attributable to common shareholders is computed as (i) net income (loss) attributable to common shareholders, (ii) less income allocable to participating securities (iii) divided by weighted average basic shares outstanding. The Company’s diluted net income (loss) per share attributable to common shareholders is computed as (i) basic net income (loss) attributable to common shareholders, (ii) plus diluted adjustments to income allocable to participating securities (iii) divided by weighted average diluted shares outstanding.

Basic and diluted net income (loss) per share is not presented for periods prior to the completion of our IPO as the ownership structure of the Company prior to the IPO was not a common unit of ownership. Instead, pro forma net income (loss) attributable to common shares is presented. Pro forma net income (loss) attributable to common shares reflects net income (loss) as reported and gives effect to an adjustment to remove accretion on the Convertible Preferred Units. In our pro forma basic and diluted income (loss) per share attributable to common shareholders calculation, we assumed the conversion of the Convertible Preferred Units occurred on
January 1, 2011 and, therefore, we have removed the related accretion to determine pro forma net income (loss).

Pro forma weighted average common shares outstanding used in the computation of pro forma basic and diluted income (loss) per share attributable to common shareholders has been computed taking into account (1) the conversion ratio at the time of the IPO of all common units and Convertible Preferred Units into common shares as if the conversion occurred as of the beginning of the year and (2) the 34.5 million common shares issued by the Company in the IPO, which included 1.5 million common shares issued pursuant to the over-allotment option exercised by the underwriters of the IPO.

The following table is a reconciliation of the Company’s net income (loss) attributable to common shareholders to basic and pro forma basic net income (loss) attributable to common shareholders and to diluted and pro forma diluted net income (loss) attributable to common shareholders and a reconciliation of basic and pro forma basic weighted average common shares outstanding to diluted and pro forma diluted weighted average common shares outstanding for the three and nine months ended September 30, 2012 and 2011:

	Three Months EndedSeptember 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
	(In thousands, except per share data)
Numerator:
Net income (loss) attributable to common shareholders	$	(36,250	)	$	51,776	$	(98,634	)	$	(36,408	)
Less: Basic income allocable to participating securities(1)	—			2,349		—			—
Basic net income (loss) attributable to common shareholders	(36,250		)	49,427		(98,634		)
Plus: Accretion to redemption value of convertible preferred units	—			—		—			24,442
Pro forma basic net loss attributable to common shareholders	—			—		—			(11,966		)
Diluted adjustments to income allocable to participating securities(1)	—			3		—			—
Diluted net income (loss) attributable to common shareholders	$	(36,250	)	$	49,430	$	(98,634	)
Pro forma diluted net loss attributable to common shareholders									$	(11,966	)
Denominator:
Weighted average number of shares used to compute net income (loss) per share:
Basic	373,448			368,996		371,140
Restricted stock awards(1)(2)	—			345		—
Diluted	373,448			369,341		371,140
Pro forma basic									349,792
Pro forma restricted stock awards(1)(2)									—
Pro forma diluted									349,792
Net income (loss) per share attributable to common shareholders:
Basic	$	(0.10	)	$	0.13	$	(0.27	)
Diluted	$	(0.10	)	$	0.13	$	(0.27	)
Pro forma basic									$	(0.03	)
Pro forma diluted									$	(0.03	)

(1)Our service vesting restricted stock awards represent participating securities because they participate in nonforfeitable dividends with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Our restricted stock awards with market and service vesting criteria and all restricted stock units are not considered to be participating securities and, therefore, are excluded from the basic net income (loss) per common share calculation. Our service vesting restricted stock awards do not participate in undistributed net losses and, therefore, are excluded from the basic net income (loss) per common share calculation in periods we are in a net loss position.

(2)Due to our basic net loss attributable to common shareholders for the three and nine months ended September 30, 2012, we excluded 17.1 million outstanding restricted stock awards and restricted stock units from the computations of diluted net loss per share because the effect would have been anti-dilutive. Due to our basic net loss attributable to common shareholders for the nine months ended September 30, 2011, we excluded 13.6 million outstanding restricted stock awards from the computations of pro forma diluted net loss per share because the effect would have been anti-dilutive.  For the three months ended September 30, 2011, we excluded 5.5 million outstanding restricted stock awards from the computations of diluted net income per share because the effect would have been anti-dilutive.

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Asset Retirement Obligations

9 Months Ended

Sep. 30, 2012

Asset Retirement Obligations

Asset Retirement Obligations

12. Asset Retirement Obligations

The following table summarizes the changes in the Company’s asset retirement obligations:

	September 30, 2012
	(In thousands)
Asset retirement obligations:
Beginning asset retirement obligations	$	20,670
Liabilities incurred during period	—
Revisions in estimated retirement obligations	—
Liabilities settled during period	—
Accretion expense	1,992
Ending asset retirement obligations	$	22,662

The Ghanaian legal and regulatory regime regarding oil field abandonment and other environmental matters is evolving. Currently, no Ghanaian environmental regulations expressly require that companies abandon or remove offshore assets although under international industry standards we would do so. The Petroleum Law provides for restoration that includes removal of property and abandonment of wells, but further states the manner of such removal and abandonment will be as provided in the Regulations; however, such Regulations have not been promulgated. Under the Environmental Permit for the Jubilee Field, a decommissioning plan will be prepared and submitted to the Ghana Environmental Protection Agency. ASC 410—Asset Retirement and Environmental Obligations requires the Company to recognize this liability in the period in which the liability was incurred. We have recorded an asset retirement obligation for fields that have commenced production. Additional asset retirement obligations will be recorded in the period in which wells within such producing fields are commissioned.

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Accounts Payable and Accrued Liabilities

9 Months Ended

Sep. 30, 2012

Accounts Payable and Accrued Liabilities

Accounts Payable and Accrued Liabilities

8. Accounts Payable and Accrued Liabilities

At September 30, 2012 and December 31, 2011, $128.2 million and $278.0 million, respectively, were recorded for invoices received but not paid. Accrued liabilities were $64.7 million and $37.2 million at September 30, 2012 and December 31, 2011, respectively, and consisted of the following:

	September 30, 2012		December 31, 2011
	(In thousands)
Accrued liabilities:
Accrued exploration, development and production	$	40,212	$	27,666
Accrued general and administrative expenses	11,303		2,159
Accrued taxes other than income	11,252		1,095
Accrued interest	620		1,208
Accrued income taxes	1,306		5,066
	$	64,693	$	37,194

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Property and Equipment

9 Months Ended

Sep. 30, 2012

Property and Equipment

Property and Equipment

6. Property and Equipment

Property and equipment is stated at cost and consisted of the following:

	September 30, 2012			December 31, 2011
	(In thousands)
Oil and gas properties:
Proved properties	$	696,047		$	607,338
Unproved properties	429,552			294,701
Support equipment and facilities	611,795			600,848
Total oil and gas properties	1,737,394			1,502,887
Less: accumulated depletion	(262,698		)	(135,622		)
Oil and gas properties, net	1,474,696			1,367,265
Other property, net	15,704			9,776
Property and equipment, net	$	1,490,400		S	1,377,041

We recorded depletion expense of $61.9 million and $41.3 million for the three months ended September 30, 2012 and 2011, respectively, and $123.3 million and $85.4 million for the nine months ended September 30, 2012 and 2011, respectively.  The Company had depletion costs of $3.9 million and nil included in crude oil inventory and other receivables as of September 30, 2012 and December 31, 2011, respectively.

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Suspended Well Costs

9 Months Ended

Sep. 30, 2012

Suspended Well Costs

Suspended Well Costs

7. Suspended Well Costs

The Company capitalizes exploratory well costs into oil and gas properties until a determination is made that the well has either found proved reserves or is impaired. If proved reserves are found, the capitalized exploratory well costs are reclassified to proved properties. The well costs are charged to expense if the exploratory well is determined to be impaired.

The following table reflects the Company’s capitalized exploratory well costs on completed wells as of and during the nine months ended September 30, 2012. The table excludes $16.7 million in costs that were capitalized and subsequently expensed in the same period.

	September 30, 2012
	(In thousands)
Beginning balance (January 1, 2012)	$	267,592
Additions to capitalized exploratory well costs pending the determination of proved reserves	104,255
Reclassification due to determination of proved reserves	—
Capitalized exploratory well costs charged to expense	(2,627		)
Ending balance (September 30, 2012)	$	369,220

The following table provides aging of capitalized exploratory well costs based on the date drilling was completed and the number of projects for which exploratory well costs have been capitalized for more than one year since the completion of drilling:

	September 30, 2012		December 31,2011
	(In thousands, except well counts)
Exploratory well costs capitalized for a period of one year or less	$	129,389	$	132,838
Exploratory well costs capitalized for a period one to three years	239,831		134,754
Ending balance	$	369,220	$	267,592
Number of projects with exploratory well costs that have been capitalized for more than one year	7		3

As of September 30, 2012, the projects with exploratory well costs capitalized for more than one year since the completion of drilling are related to the Mahogany Area (formerly known as the Mahogany East Area), Teak-1, Teak-2 and Akasa discoveries in the WCTP Block and the Tweneboa, Enyenra and Ntomme discoveries in the DT Block, which are all in Ghana.

Mahogany Area—The Mahogany area, a combined area covering parts of the Mahogany discovery and the Mahogany Deep discovery area was declared commercial in September 2010, and a PoD was submitted to Ghana’s Ministry of Energy as of May 2, 2011. In a letter dated May 16, 2011, the Ministry of Energy did not approve the PoD and requested that the WCTP Block partners take certain steps regarding notifications of discovery and commerciality; and requested other information. The WCTP Block partners believe the combined submission was proper and have held meetings with GNPC which resolved issues relating to the PoD work program. From May 2011, GNPC and the WCTP Block partners continued working to resolve other differences; however, the WCTP PA contains specific timelines for PoD approval and discussions, which expired at the end of June 2011. On June 30, 2011, we, as Operator of the WCTP Block and on behalf of the WCTP Block partners, delivered a Notice of Dispute to the Ministry of Energy as provided under the WCTP PA, which is the initial step in triggering the formal dispute resolution process under the WCTP PA with the Government of Ghana regarding approval of the Mahogany PoD. This Notice of Dispute establishes a process for negotiation and consultation for a period of 30 days (or longer if mutually agreed) among senior representatives from the Ministry of Energy, GNPC and the WCTP Block partners to resolve the matter of approval of the PoD. We and the WCTP Block partners continue discussions with the Ministry of Energy and GNPC to resolve differences on the PoD.

Teak-1 Discovery—Two appraisal wells have been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Teak-1 discovery is expected to be made by the WCTP Block partners in 2013. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the WCTP PA.

Teak-2 Discovery—We have performed a gauge installation on the well and are reprocessing seismic data. Following additional appraisal and evaluation, a decision regarding commerciality of the Teak-2 discovery is expected to be made by the WCTP Block partners in 2013. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the WCTP PA.

Akasa Discovery—We have performed a drill stem test and gauge installation on the well and are analyzing the data. Following additional appraisal and evaluation, a decision regarding commerciality of the Akasa discovery is expected to be made by the WCTP Block partners in 2013. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the WCTP PA.

Ntomme Discovery—One appraisal well has been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Ntomme discovery is expected to be made by the DT Block partners by the end of 2012. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the DT PA.

Tweneboa Discovery—Three appraisal wells have been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Tweneboa discovery is expected to be made by the DT Block partners by the end of 2012. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the DT PA. However, the DT Block partners have the option to request a new petroleum agreement for the non-associated gas within the Tweneboa discovery area, thereby extending the period of commercial assessment of the discovery.

Enyenra Discovery—Four appraisal wells have been drilled. Following additional appraisal and evaluation, a decision regarding commerciality of the Enyenra discovery is expected to be made by the DT Block partners by the end of 2012. Within six months of such a declaration, a PoD would be prepared and submitted to Ghana’s Ministry of Energy, as required under the DT PA.

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Debt

9 Months Ended

Sep. 30, 2012

Debt

Debt

9. Debt

In March 2011, the Company secured a $2.0 billion commercial debt facility (the “Facility”) from a number of financial institutions and extinguished the then existing commercial debt facilities. The Facility was syndicated to certain participants of the existing facilities, as well as new participants. The Facility supports our oil and gas exploration, appraisal and development programs and corporate activities. The total loan commitments of the Facility may be increased up to a maximum of $3.0 billion if the lenders increase their commitments or if loan commitments from new financial institutions are added. The International Finance Corporation entered the Facility in February 2012. The terms and conditions of the Facility remained consistent with the original terms and conditions, and the total commitment under the Facility remained unchanged.

As part of the debt refinancing in March 2011, the repayment of borrowings under the existing facility attributable to financial institutions that did not participate in the Facility was accounted for as an extinguishment of debt, and existing unamortized debt issuance costs attributable to those participants were expensed. For participants in the existing facility that participated in the Facility, an analysis was performed to determine if an exchange of debt instruments with substantially different terms had occurred. As a result, we recorded a $59.6 million loss on the extinguishment of debt. Additionally, we have $61.3 million of deferred financing costs related to the Facility, which are being amortized over the term of the Facility.

As of September 30, 2012, borrowings under the Facility totaled $1.0 billion. As of September 30, 2012, the undrawn availability under the Facility was $160.0 million. In October 2012, as part of the normal borrowing base determination process, the undrawn availability under the Facility was increased $180.4 million to $340.4 million. Interest expense was $8.2 million and $9.3 million (net of capitalized interest of $2.8 million and $1.0 million), and commitment fees were $1.5 million and $2.2 million for the three months ended September 30, 2012 and 2011, respectively. Interest expense was $26.6 million and $36.6 million (net of capitalized interest of $7.3 million and $3.0 million) and commitment fees were $4.8 million and $5.7 million for the nine months ended September 30, 2012 and 2011, respectively.

The interest is the aggregate of the applicable margin (3.25% to 4.75%, depending on the amount of the Facility that is being utilized and the length of time that has passed from the date the Facility was entered into); LIBOR; and mandatory cost (if any, as defined in the Facility). Interest is payable on the last day of each interest period (and, if the interest period is longer than six months, on the dates falling at six-month intervals after the first day of the interest period). We pay commitment fees on the undrawn and unavailable portion of the total commitments. Commitment fees for the lenders are equal to 40% per annum of the then-applicable respective margin when a commitment is available for utilization and, equal to 20% per annum of the then-applicable respective margin when a commitment is not available for utilization. The Company recognizes interest expense in accordance with ASC 835—Interest, which requires interest expense to be recognized using the effective interest method. We determined the effective interest rate based on the estimated level of borrowings under the Facility.  Accordingly, we recognized interest expense in excess of interest currently payable of $1.2 million and $1.0 million during the three months ended September 30, 2012 and 2011, respectively, and $4.3 million and $2.2 million during the nine months ended September 30, 2012 and 2011, respectively.

The Facility provides a revolving-credit and letter of credit facility for an availability period that expires on May 15, 2014 (in the case of the revolving-credit facility) and on the final maturity date (in the case of the letter of credit facility) of March 29, 2018. The available facility amount is subject to borrowing base constraints and also is constrained by the amortization schedule (once repayments under the Facility begin) commencing on May 15, 2014. The first required payment could be as early as June 15, 2014, subject to the level of outstanding borrowings.

We have the right to cancel all the undrawn commitments under the Facility. The amount of funds available to be borrowed under the Facility, also known as the borrowing base amount, was previously determined each year on June 15 and December 15 as part of a forecast that is prepared by and agreed to by Kosmos and the Technical and Modeling Banks; however, in April 2012, the lenders agreed to change the borrowing base determination dates to April 15 and October 15. The formula to calculate the borrowing base amount is based, in part, on the sum of the net present values of net cash flows and relevant capital expenditures reduced by certain ratios.

If an event of default exists under the Facility, the lenders can accelerate the maturity and exercise other rights and remedies, including the enforcement of security granted pursuant to the Facility over certain assets held by us.

We were in compliance with the financial covenants contained in the Facility as of the October 15, 2012 forecast, which requires the maintenance of:

·the field life cover ratio, not less than 1.30x; and

·the loan life cover ratio, not less than 1.10x.

The “field life cover ratio” is broadly defined, for each applicable forecast period, as the ratio of (x) net present value of net cash flow through the depletion of the Jubilee Field plus the net present value of capital expenditures incurred in relation to the Jubilee Field and certain other fields in Ghana, to (y) the aggregate loan amounts outstanding under the Facility. The “loan life cover ratio” is broadly defined, for each applicable forecast period, as the ratio of (x) net present value of net cash flow through the final maturity date of the Facility plus the net present value of capital expenditures incurred in relation to the Jubilee Field and certain other fields in Ghana, to (y) the aggregate loan amounts outstanding under the Facility.

At September 30, 2012, the scheduled maturities of debt during the five year period and thereafter are as follows:

	Payments Due by Year
	2012 (1)		2013		2014		2015		2016		Thereafter
	(In thousands)
Commercial debt facility(2)	$	—	$	—	$	—	$	—	$	444,444	$	555,556

(1)   Represents payments for the period October 1, 2012 through December 31, 2012.

(2)The scheduled maturities of debt are based on the level of borrowings and the available borrowing base as of September 30, 2012. Any increases or decreases in the level of borrowings or decreases in the available borrowing base would impact the scheduled maturities of debt during the five year period and thereafter.

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Equity-based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

LTIP

Equity-based Compensation

Schedule of number of shares available for issuance pursuant to awards

	Shares
	(In thousands)
Approved and authorized awards(1)	24,503
Awards issued after May 16, 2011(1)	(18,285	)
Awards forfeited(1)	86
Awards available for future grant	6,304

(1)Excludes 10.0 million restricted stock awards that were exchanged for unvested profit units and any related forfeitures of such awards. Also, excludes forfeited restricted stock awards issued in connection with our initial public offering, which include the May 18, 2011 and June 15, 2011 award tranches, as these awards are not available for future grant.

Restricted stock awards | LTIP

Equity-based Compensation

Schedule of equity-based incentive awards activity

			Weighted-		Market / Service		Weighted-
	Service Vesting Restricted Stock		Average Grant-Date		Vesting Restricted Stock		Average Grant-Date
	Awards		Fair Value		Awards		Fair Value
	(In thousands)				(In thousands)
Outstanding at December 31, 2011	17,195		$	13.36	3,522		$	13.21
Granted	578		12.06		303		9.45
Forfeited	(852	)	13.77		(155	)	12.92
Vested	(5,202	)	9.97		—		—
Outstanding at September 30, 2012	11,719		14.77		3,670		12.91

Restricted stock units | LTIP

Equity-based Compensation

Schedule of restricted stock units activity

			Weighted-		Market / Service		Weighted-
	Service Vesting Restricted Stock		Average Grant-Date		Vesting Restricted Stock		Average Grant-Date
	Units		Fair Value		Units		Fair Value
	(In thousands)				(In thousands)
Outstanding at December 31, 2011	—		$	—	—		$	—
Granted	983		10.58		792		15.81
Forfeited	(23	)	10.98		(17	)	15.81
Vested	—		—		—		—
Outstanding at September 30, 2012	960		10.57		775		15.81

Kosmos Energy Holdings | Profit units

Equity-based Compensation

Schedule of plan activity

			Weighted-Average
			Grant-Date
	Profit Units		Fair Value
	(In thousands)
Outstanding at December 31, 2010	13,910		$	1.76
Granted	1,783		15.71
Relinquished	(2,503	)	0.12
Outstanding at May 16, 2011	13,190		3.96

Schedule of equity-based incentive awards activity

			Weighted-Average
	Unvested		Grant-Date
	Profit Units		Fair Value
	(In thousands)
Outstanding at December 31, 2010	3,464		$	1.60
Granted	1,783		15.71
Vested	(1,066	)	1.09
Relinquished	(1,253	)	0.10
Outstanding at May 16, 2011	2,928		11.02

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Derivative Financial Instruments (Details 3) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Derivative instruments, Balance Sheet Location
Derivatives assets - current	$ 3,185,000
Derivatives liabilities - current	(24,722,000)	(24,407,000)
Derivatives liabilities - long-term	(6,094,000)	(8,427,000)
Not designated as hedging instruments
Derivative instruments, Balance Sheet Location
Total	(27,631,000)	(32,834,000)
Commodity derivatives | Not designated as hedging instruments
Derivative instruments, Balance Sheet Location
Derivatives assets - current	3,185,000
Derivatives liabilities - current	(20,306,000)	(20,303,000)
Derivatives liabilities - long-term	(2,715,000)	(4,457,000)
Cash settlements made on purchased puts and swaps with calls which were settled in the month subsequent to period end	3,500,000	3,200,000
Deferred premiums related to purchased puts and three-way collar contacts	8,700,000
Deferred premiums realed to three-way collar contracts	2,400,000
Interest rate contracts | Not designated as hedging instruments
Derivative instruments, Balance Sheet Location
Derivatives liabilities - current	(4,416,000)	(4,104,000)
Derivatives liabilities - long-term	$ (3,379,000)	$ (3,970,000)

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Equity-based Compensation

9 Months Ended

Sep. 30, 2012

Equity-based Compensation

Equity-based Compensation

14. Equity-based Compensation

Profit Units

Prior to our corporate reorganization, Kosmos Energy Holdings issued common units designated as profit units with a threshold value of $0.85 to $90 to employees, management and directors. Profit units, the defined term in the related agreements, are equity awards that are measured on the grant date and expensed over a vesting period of four years. Founding management and directors vested 20% as of the date of issuance and an additional 20% on the anniversary date for each of the next four years. Profit units issued to employees vested 50% on the second and fourth anniversary of the issuance date. Of the 100 million authorized common units, 15.7 million were designated as profit units.

The following is a summary of the Kosmos Energy Holdings’ profit unit activity immediately prior to the corporate reorganization:

			Weighted-Average
			Grant-Date
	Profit Units		Fair Value
	(In thousands)
Outstanding at December 31, 2010	13,910		$	1.76
Granted	1,783		15.71
Relinquished	(2,503	)	0.12
Outstanding at May 16, 2011	13,190		3.96

A summary of the status of the Kosmos Energy Holdings’ unvested profit units immediately prior to the corporate reorganization were as follows:

			Weighted-Average
	Unvested		Grant-Date
	Profit Units		Fair Value
	(In thousands)
Outstanding at December 31, 2010	3,464		$	1.60
Granted	1,783		15.71
Vested	(1,066	)	1.09
Relinquished	(1,253	)	0.10
Outstanding at May 16, 2011	2,928		11.02

Total profit unit compensation expense recognized in income was zero and $1.2 million for the three and nine months ended
September 30, 2011, respectively.

The significant assumptions used to calculate the fair values of the profit units during 2011, as calculated using a binomial tree, were as follows: no dividend yield, expected volatility ranging from approximately 25% to 66%; risk-free interest rate ranging from 1.3% to 5.1%; expected life ranging from 1.2 to 8.1 years; and projected turnover rate of 7.0% for employees and none for management.

Restricted Stock Awards and Restricted Stock Units

As part of our corporate reorganization, vested profit units were exchanged for 31.7 million common shares of Kosmos Energy Ltd., unvested profit units were exchanged for 10.0 million restricted stock awards and the $90 profit units were cancelled. Based on the terms and conditions of our corporate reorganization, the exchange of profit units for common shares of Kosmos Energy Ltd. resulted in no incremental compensation costs.

In April 2011, the Board of Directors approved a Long-Term Incentive Plan (the “LTIP”), which provides for the granting of incentive awards in the form of stock options, stock appreciation rights, restricted stock awards, restricted stock units, among other award types. The LTIP provides for the issuance of 24.5 million shares pursuant to awards under the plan, in addition to the 10.0 million restricted stock awards exchanged for unvested profit units.

The following table shows the number of shares available for issuance pursuant to awards under the Company’s LTIP at September 30, 2012:

	Shares
	(In thousands)
Approved and authorized awards(1)	24,503
Awards issued after May 16, 2011(1)	(18,285	)
Awards forfeited(1)	86
Awards available for future grant	6,304

(1)Excludes 10.0 million restricted stock awards that were exchanged for unvested profit units and any related forfeitures of such awards. Also, excludes forfeited restricted stock awards issued in connection with our initial public offering, which include the May 18, 2011 and June 15, 2011 award tranches, as these awards are not available for future grant.

The Company records compensation expense equal to the fair value of share-based payments over the vesting periods of the LTIP awards. The Company recorded compensation expense from awards granted under our LTIP of $19.4 million and $20.1 million during the three months ended September 30, 2012 and 2011, respectively, and $58.2 million and $28.1 million during the nine months ended September 30, 2012 and 2011, respectively. Subsequent to May 16, 2011, the Company granted both restricted stock awards and restricted stock units with service vesting criteria and granted both restricted stock awards and restricted stock units with a combination of market and service vesting criteria under the LTIP.

The following table reflects the outstanding restricted stock awards as of September 30, 2012:

			Weighted-		Market / Service		Weighted-
	Service Vesting Restricted Stock		Average Grant-Date		Vesting Restricted Stock		Average Grant-Date
	Awards		Fair Value		Awards		Fair Value
	(In thousands)				(In thousands)
Outstanding at December 31, 2011	17,195		$	13.36	3,522		$	13.21
Granted	578		12.06		303		9.45
Forfeited	(852	)	13.77		(155	)	12.92
Vested	(5,202	)	9.97		—		—
Outstanding at September 30, 2012	11,719		14.77		3,670		12.91

The following table reflects the outstanding restricted stock units as of September 30, 2012:

			Weighted-		Market / Service		Weighted-
	Service Vesting Restricted Stock		Average Grant-Date		Vesting Restricted Stock		Average Grant-Date
	Units		Fair Value		Units		Fair Value
	(In thousands)				(In thousands)
Outstanding at December 31, 2011	—		$	—	—		$	—
Granted	983		10.58		792		15.81
Forfeited	(23	)	10.98		(17	)	15.81
Vested	—		—		—		—
Outstanding at September 30, 2012	960		10.57		775		15.81

For equity-based compensation awards, compensation expense is recognized in the Company’s financial statements over the awards’ vesting periods based on their grant date fair value. The Company utilizes (i) the closing stock price on the date of grant to determine the fair value of service vesting restricted stock awards and service vesting restricted stock units and (ii) a Monte Carlo simulation to determine the fair value of restricted stock awards and restricted stock units with a combination of market and service vesting criteria.

For restricted stock awards with a combination of market and service vesting criteria, the number of common shares to be issued is determined by comparing the Company’s total shareholder return with the total shareholder return of a predetermined group of peer companies over the performance period and can vest in up to 100% of the awards granted. The grant date fair value of these awards ranged from $6.70 to $13.57 per award. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. The expected volatility utilized in the model was estimated using our historical volatility and the historical volatilities of our peer companies and ranged from 41.3% to 56.7%. The risk-free interest rate was based on the U.S. treasury rate for a term commensurate with the expected life of the grant and ranged from 0.5% to 1.1%.

For restricted stock units with a combination of market and service vesting criteria, the number of common shares to be issued is determined by comparing the Company’s total shareholder return with the total shareholder return of a predetermined group of peer companies over the performance period and can vest in up to 200% of the awards granted. The grant date fair value of these awards was $15.81 per award. The Monte Carlo simulation model utilizes multiple input variables that determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. The expected volatility utilized in the model was estimated using our historical volatility and the historical volatilities of our peer companies and was 54.0%. The risk-free interest rate was based on the U.S. treasury rate for a term commensurate with the expected life of the grant and was 0.5%.

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Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Accounting Policies

Schedule of estimated useful lives of other property

	Years Depreciated
Leasehold improvements	6 to 8
Office furniture, fixtures and computer equipment	3 to 7
Vehicles	5

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Derivative Financial Instruments (Details)	Sep. 30, 2012 Provisional Oil Sales mbbls	Sep. 30, 2012 Purchased Puts Term October 2012 to December 2012 mbbls	Sep. 30, 2012 Swaps with calls Term October 2012 to December 2012 mbbls	Sep. 30, 2012 Three-Way Collars Term January 2013 to December 2013 mbbls	Oct. 31, 2012 Three-Way Collars Term January 2013 to December 2013 Subsequent event mbbls	Sep. 30, 2012 Three-way collars Term January 2013 to December 2013 mbbls
Derivative Financial Instruments
Volumes (in MBbl)	995	426	600	1,500	1,000	1,004
Weighted Average Deferred Premium per Bbl		6.86		4.82
Average price, subject to final pricing	110.28
Weighted average price per Bbl			97.21
Floor price per Bbl		61.48		95.00	90.00	87.50
Weighted average ceiling price per Bbl				105.00	115.39	115.00
Call price per Bbl			110.00	125.00	135.00	135.00

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Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Variable interest entity
Cash and cash equivalents	$ 399,650	$ 673,092	$ 656,442	$ 100,415
Prepaid expenses and other	9,801	13,913
Other receivables	1,560	981
Accrued liabilities	64,693	37,194
Other long-term liabilities	12,507	4,896
Kosmos Energy Finance International
Variable interest entity
Cash and cash equivalents	119,800	231,600
Prepaid expenses and other	400
Other receivables		100
Accrued liabilities	600	1,200
Other long-term liabilities	$ 7,200	$ 3,000

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ (36,250)	$ 51,776	$ (98,634)	$ (11,966)
Other comprehensive income (loss):
Reclassification adjustments for derivative (gains) losses included in net income (loss)	(133)	1,193	295	2,934
Other comprehensive income (loss)	(133)	1,193	295	2,934
Comprehensive income (loss)	$ (36,383)	$ 52,969	$ (98,339)	$ (9,032)

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Acquisition of FPSO

9 Months Ended

Sep. 30, 2012

Acquisition of FPSO

Acquisition of FPSO

3. Acquisition of FPSO

Effective May 7, 2010, Tullow Ghana Limited, a subsidiary of Tullow Oil plc, (“Tullow”) as Unit Operator for and on behalf of the Jubilee Unit partners under the Unitization and Unit Operating Agreement (“Jubilee UUOA”), entered into the Advance Payments Agreement with MODEC, Inc. (“MODEC”) related to partial funding of the construction of the FPSO. The maturity date of the Advance Payments Agreement was extended from September 15, 2011 through the acquisition date of the FPSO.

On December 29, 2011, Tullow as Unit Operator for and on behalf of the Jubilee Unit partners under the Jubilee UUOA, acquired the FPSO we are using to produce hydrocarbons from the Jubilee Field from MODEC for $754.5 million, or $202.6 million net to Kosmos. At the time of the acquisition of the FPSO, our note receivable under the Advance Payments Agreement was $102.8 million. To fund the purchase, we paid $99.8 million in cash and applied the note receivable due under the Advance Payments Agreement to the purchase. As of December 31, 2011 the remaining balance under the Advance Payments Agreement was zero. The acquisition was recorded as an increase to oil and gas property. Prior to the acquisition of the FPSO, the Jubilee Unit leased the FPSO from MODEC and the lease costs were recorded as oil and gas production costs.

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Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income (Loss) Per Share
Common shares issued	34,500,000		34,500,000
Shares issued pursuant to over-allotment option	1,500,000		1,500,000
Numerator:
Net income (loss) attributable to common shareholders	$ (36,250)	$ 51,776	$ (98,634)	$ (36,408)
Less: Basic income allocable to participating securities		2,349
Basic net income (loss) attributable to common shareholders	(36,250)	49,427	(98,634)	(36,408)
Plus: Accretion to redemption value of convertible preferred units				24,442
Diluted adjustments to income allocable to participating securities		3
Diluted net income (loss) attributable to common shareholders	(36,250)	49,430	(98,634)
Weighted average number of shares used to compute net income (loss) per share:
Basic (in shares)	373,448,000	368,996,000	371,140,000
Restricted stock awards (in shares)		345,000
Diluted (in shares)	373,448,000	369,341,000	371,140,000
Pro forma basic (in shares)				349,792,000
Pro forma diluted (in shares)				349,792,000
Net income (loss) per share attributable to common shareholders:
Basic (in dollars per share)	$ (0.10)	$ 0.13	$ (0.27)
Diluted (in dollars per share)	$ (0.10)	$ 0.13	$ (0.27)
Pro forma basic (in dollars per share)				$ (0.03)
Pro forma diluted (in dollars per share)				$ (0.03)
Outstanding restricted stock awards and restricted stock units excluded from the computations of diluted net loss (income) per share (in shares)	17,100,000	5,500,000	17,100,000
Pro forma
Numerator:
Basic net income (loss) attributable to common shareholders				(11,966)
Diluted net income (loss) attributable to common shareholders				$ (11,966)
Net income (loss) per share attributable to common shareholders:
Outstanding restricted stock awards and restricted stock units excluded from the computations of diluted net loss (income) per share (in shares)				13,600,000

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Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2012

Property and Equipment

Schedule of property and equipment

	September 30, 2012			December 31, 2011
	(In thousands)
Oil and gas properties:
Proved properties	$	696,047		$	607,338
Unproved properties	429,552			294,701
Support equipment and facilities	611,795			600,848
Total oil and gas properties	1,737,394			1,502,887
Less: accumulated depletion	(262,698		)	(135,622		)
Oil and gas properties, net	1,474,696			1,367,265
Other property, net	15,704			9,776
Property and equipment, net	$	1,490,400		S	1,377,041

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Organization (Details 2)	9 Months Ended
	Sep. 30, 2012 segment
Organization
Number of business segments	1

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Convertible Preferred Units

9 Months Ended

Sep. 30, 2012

Convertible Preferred Units

Convertible Preferred Units

13. Convertible Preferred Units

In May 2011, contemporaneous with Kosmos Energy Ltd.’s IPO, the Series A Convertible Preferred Units (“Series A Units”), Series B Convertible Preferred Units (“Series B Units”) and Series C Convertible Preferred Units (“Series C Units”) of Kosmos Energy Holdings were exchanged into our common shares based on the pre-offering equity value of such interests. This resulted in the Series A Units, Series B Units and Series C Units being exchanged into 163.1 million; 109.8 million; and 4.8 million common shares of Kosmos Energy Ltd., respectively, or 277.7 million common shares in the aggregate. The common shares have one vote per share and a par value of $0.01. The exchange of the Convertible Preferred Units had the effect of increasing the book value of shareholders’ equity by approximately $1.0 billion. Accretion to redemption value of the Convertible Preferred Units was recorded through the date of the exchange. After the date of the exchange, the related accretion on the Convertible Preferred Units ceased to accrue and all rights of the holders with respect to the Convertible Preferred Units terminated, except for the right to receive shares of common shares issuable upon the exchange and the rights entitled to a holder of a common share.

The Convertible Preferred Units were issued in separate series at an issue price of $10 per unit, $25 per unit, and $28.25 per unit, respectively. Under the Fourth Amended and Restated Operating Agreement of Kosmos Energy Holdings, as amended, (the “Agreement”) governing Kosmos Energy Holdings, the Convertible Preferred Units received distributions, if any, equal to the “Accreted Value” of the units, prior to any distributions to the common unit holders. The Accreted Value was defined in the Agreement as the unit purchase price plus the preferred return amount per unit equal to 7% of the Accreted Value per annum (compounded quarterly) for the first nine years after the year of Kosmos Energy Holdings’ initial operating agreement and 14% of the Accreted Value per annum (compounded quarterly) thereafter, unless a monetization event (as defined in the Agreement) occurred at which time the preferred return would revert to 7%. The holders of the Convertible Preferred Units received the accumulated preferred return upon the consummation of our IPO, as defined in the Agreement. The accumulated preferred return on the Convertible Preferred Units was recorded through the date of the offering. The amount was applied to additional paid-in capital first, with the remaining amount applied to the accumulated deficit. The Convertible Preferred Units were classified as mezzanine equity at December 31, 2010, as Kosmos Energy Holdings could not solely control the type of consideration issuable on the exchange and the Convertible Preferred Unit holders controlled Kosmos Energy Holdings’ Board of Directors.

We recorded accretion on the Convertible Preferred Units of $24.4 million for the nine months ended September 30, 2011.