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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1471261	Cobalt International Energy Inc.	CIE	Crude Petroleum & Natural Gas (1311)	270821169

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
908428	E William Macaulay	C/O Frc Founders Corporation One Lafayette Place Greenwich CT 06830	No	No	Yes	No
1372777	P L Xi Fund Reserve First	One Lafayette Place Greenwich CT 06830	No	No	Yes	No
1477477	First Reserve Gp Xi, Inc.	C/O Frc Founders Corporation One Lafayette Place Greenwich CT 06830	No	No	Yes	No
1477478	First Reserve Gp Xi, L.p.	C/O Frc Founders Corporation One Lafayette Place Greenwich CT 06830	No	No	Yes	No
1478713	Fr Xi Onshore Aiv, L.p.	One Lafayette Place Greenwich CT 06830	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2012-02-29	8,843,635	$27.16	46,757,960	No	4	S	Indirect	See footnotes
Common Stock	Disposition	2012-02-29	2,955,519	$27.16	15,626,385	No	4	S	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnotes
No	4	S	Indirect	See footnotes

Footnotes

This amount represents the $28.00 secondary public offering price per share of common stock of Cobalt International Energy, Inc. (the "Common Stock") less the underwriting discount of $0.84 per share.
This Form 4 is filed on behalf of William E. Macaulay, First Reserve GP XI, Inc. ("GP XI Inc."), First Reserve GP XI, L.P. ("GP XI"), First Reserve Fund XI, L.P. ("Fund XI") and FR XI Onshore AIV, L.P. ("Onshore AIV"). GP XI is the general partner of Fund XI and Onshore AIV, and GP XI Inc. is the general partner of GP XI. Mr. Macaulay is a director of GP XI Inc. and has the right to appoint a majority of the board of directors of GP XI Inc. In such capacities, each of Mr. Macaulay, GP XI Inc. and GP XI may be deemed to have an indirect pecuniary interest in the shares of Common Stock held by Fund XI and Onshore AIV.
These shares of Common Stock are held by Fund XI.
These shares of Common Stock are held by Onshore AIV.
Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended, each of the Reporting Persons herein states that this filing shall not be deemed an admission that such Reporting Person is the beneficial owner of any of the shares of Common Stock covered by this Statement. Additionally, each Reporting Person, other than Fund XI and Onshore AIV with respect to the securities held directly by each of them, disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.