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 *
Warburg Pincus Private Equity X O&G, L.P.
  2. Issuer Name and Ticker or Trading Symbol
Laredo Petroleum Holdings, Inc. [LPI]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O WARBURG PINCUS & CO., 450 LEXINGTON AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
08/27/2013
(Street)

NEW YORK, NY 10017
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ 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)
Code V Amount (A) or (D) Price
Common Stock, par value $0.01 per share (''Common Stock'') 08/27/2013   S   319,604 D $ 22.9781 16,111,284 D (1) (2)  

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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 Security 3. 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)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Warburg Pincus Private Equity X O&G, L.P.
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
  X   X    
Warburg Pincus X Partners, L.P.
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
  X   X    
Warburg Pincus X, L.P.
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
  X   X    
Warburg Pincus X LLC
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
  X   X    
Warburg Pincus Partners LLC
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
  X   X    
WARBURG PINCUS & CO.
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
  X   X    
WARBURG PINCUS LLC
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
    X    
KAYE CHARLES R
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
    X    
Landy Joseph P.
C/O WARBURG PINCUS & CO.
450 LEXINGTON AVENUE
NEW YORK, NY 10017
    X    

Signatures

 /s/ Scott A. Arenare Attorney-in-Fact of Warburg Pincus & Co., as Managing Member of Warburg Pincus Partners LLC, as Sole Member of Warburg Pincus X LLC, as GP of Warburg Pincus X, L.P., as GP of Warburg Pincus Private Equity X O&G, L.P.***   08/27/2013
**Signature of Reporting Person Date

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) See Exhibit 99.1; Note 1.
(2) See Exhibit 99.1; Note 2.
 
Remarks:
Exhibit List: Exhibit 99.1 - Explanation of Responses Exhibit 99.2 - Joint Filer Information Exhibit 99.3 - Joint Filers' Signatures *** The Power of Attorney given by Warburg Pincus & Co. was previously filed with the U.S. Securities & Exchange Commission on January 15, 2013 as an exhibit to a statement on Schedule 13D/A filed by Warburg Pincus Private Equity X, L.P. with respect to Talon Therapeutics, Inc. and is hereby incorporated by reference.

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