Form: 4

Statement of changes in beneficial ownership of securities

March 23, 2005

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 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 *
BROWN BROTHERS HARRIMAN & CO
   2. Issuer Name and Ticker or Trading Symbol
VAALCO ENERGY INC /DE/ [EGY] 		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)
140 BROADWAY		 3. Date of Earliest Transaction (Month/Day/Year)
03/17/2005
(Street)

NEW YORK, NY 10005		 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)
Code V Amount (A) or (D) Price
Common Stock 03/17/2005   C   18,334,250 A (3) 31,263,441 I See footnote (1)
Common Stock 03/17/2005   X   4,635,244 A (4) 35,898,685 I See footnote (1)
Common Stock 03/22/2005   J(2)   35,898,685 D $ 3.85 0 I See footnote (1)

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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
Preferred Stock (3) 03/17/2005   C     6,667   (5)   (6) Common Stock 18,334,250 $ 0 0 I See footnote (1)
Warrants (4) 03/17/2005   X     7,500,000   (5) 06/10/2007 Common Stock 4,635,244 $ 0 0 I See footnote (1)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
BROWN BROTHERS HARRIMAN & CO
140 BROADWAY
NEW YORK, NY 10005		     X    

Signatures

 /s/ Lawrence C. Tucker, Partner   03/23/2005
**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) By The 1818 Fund II, L.P. ("Fund II"). Brown Brothers Harriman & Co. is the general partner of Fund II, and, as such, its pecuniary interest in the securities is limited to its percentage interest in such securities.
(2) Sale of Common Stock pursuant to a registration statement filed by Vaalco Energy, Inc. with the Securities and Exchange Commission on December 27, 2004.
(3) 6,667 shares of Preferred Stock were converted into 18,334,250 shares of Common Stock for no additional consideration in accordance with the terms of the Preferred Stock.
(4) The exercise price of $0.50 per share was paid by the forfeiture in accordance with the terms of the Warrants of an aggregate of 614,755 Warrants with respect to shares of Common Stock.
(5) Immediate.
(6) Not applicable.

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