Sec Form 4 Filing - Dawson Walter @ GRAN TIERRA ENERGY, INC. - 2010-08-19

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 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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1. Name and Address of Reporting Person Dawson Walter 2. Issuer Name and Ticker or Trading Symbol GRAN TIERRA ENERGY, INC. [ GTE] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O GRAN TIERRA ENERGY INC., 600, 311 10TH AVENUE S.W. 3. Date of Earliest Transaction (MM/DD/YY) 08/19/2010 (Street) CALGARY, A0T2R 0B2 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 08/19/2010 S 100 D $ 6.0107 318,539 D Common Stock 08/19/2010 S 500 D $ 6.0105 318,039 D Common Stock 08/19/2010 S 200 D $ 6.0021 317,839 D Common Stock 08/19/2010 S 145 D $ 6.0016 317,694 D Common Stock 08/19/2010 S 100 D $ 6.0015 317,594 D Common Stock 08/19/2010 S 200 D $ 6.0007 317,394 D Common Stock 08/19/2010 S 200 D $ 6.0006 317,194 D Common Stock 08/19/2010 S 1,900 D $ 6.0005 315,294 D Common Stock 08/19/2010 S 1,955 D $ 6.0001 313,339 D Common Stock 08/19/2010 S 11,752 D $ 6 301,587 D Common Stock 2,137,302 I By Perfco Investments Ltd. Common Stock 158,730 I By Spouse

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Dawson Walter C/O GRAN TIERRA ENERGY INC. 600, 311 10TH AVENUE S.W. CALGARY, A0T2R 0B2 X Signatures /s/Sonya Messner, Attorney-In-Fact 08/20/2010 Signature of Reporting Person Date

Explanation of Responses:
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* 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).

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