Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
CAISSE DE DEPOT ET PLACEMENT DU QUEBEC
  2. Issuer Name and Ticker or Trading Symbol
Cobalt International Energy, Inc. [CIE]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director__X__ 10% Owner
_____ Officer (give title below)_____ Other (specify below)
(Last)
(First)
(Middle)
1000 PLACE JEAN-PAUL RIOPELLE
3. Date of Earliest Transaction (Month/Day/Year)
10/19/2012
(Street)

MONTREAL, A8 H2Z2B3
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
CodeVAmount(A) or (D)Price
Common stock, $0.01 par value 10/19/2012   P   11,400 A $ 21.71 52,060 (1) D  
Common stock, $0.01 par value               26,939,795 I See footnote (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Reporting Owners

Reporting Owner Name / AddressRelationships
 Director 10% Owner Officer Other
CAISSE DE DEPOT ET PLACEMENT DU QUEBEC
1000 PLACE JEAN-PAUL RIOPELLE
MONTREAL, A8 H2Z2B3
    X    

Signatures

 Soulef Hadjoudj, Legal counsel  11/07/2012
**Signature of Reporting PersonDate

Explanation of Responses:

*If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)The securities were acquired through a managed account administered on behalf of the Reporting Person by an external investment asset manager retained by the Reporting Person pursuant to an asset management agreement.
(2)The Reporting Person may be deemed to also beneficially own indirectly an aggregate of 26,939,795 shares of Cobalt International Energy, Inc. common stock, par value $0.01 per share, through KERN Cobalt Co-Invest Partners AP LP (the "AP Partnership"), as a result of the Reporting Person being a limited partner of the AP Partnership. See the Form 3 and Form 4 filed by the AP Partnership and the Reporting Person, among others, with SEC on December 16, 2009 and March 2, 2012, respectively. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein if any and this Form 4 shall not be deemed to be an admission that the reporting Person is a member of a "group" the beneficial owner of any securities reported herein or has any pecuniary interest in any of the securities reported herein in each case for purposes of Section 16 of the Securities Exchange Act of 1934 as amended or for any other purpose

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