SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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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1. Name and Address of Reporting Person^*

Dawson Walter

(Last)

(First)

(Middle)

1700, 700 4TH AVE. SW

(Street)

CALGARY

T2P 3J4

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
04/30/2007

3. Issuer Name and Ticker or Trading Symbol
GRAN TIERRA ENERGY, INC. [ GTRE.OB ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	2,137,302	I	By Perfco Investments Ltd.
Common Stock	301,587	D
Common Stock	158,730	I	By Spouse

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Option (Right to Buy)⁽¹⁾	11/10/2006	11/10/2015	Common Stock	100,000	$0.8	D
Stock Option (Right to Buy)⁽²⁾	11/08/2007	11/08/2016	Common Stock	50,000	$1.27	D
Warrants (Right to buy)	06/20/2006	06/20/2011	Common Stock	100,000	$1.75	I	By Perfco Investments Ltd.
Warrants (Right to Buy)	09/01/2005	09/01/2010	Common Stock	175,000	$1.25	I	By Perfco Investments Ltd.
Warrants (Right to Buy)	12/14/2005	12/14/2010	Common Stock	100,000	$1.25	D

Explanation of Responses:

1. The option shall vest and become exercisable in three equal consecutive annual installments commencing November 10, 2006.

2. The option shall vest and become exercisable in three equal consecutive annual installments commencing November 8, 2007.

	/s/Martin H. Eden, Attorney-In-Fact	04/30/2007
	** Signature of Reporting Person	Date
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 5 (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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.