13G Filing: Amber Capital and Gran Tierra Energy Inc. (GTE)

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(g) ¨

Parent holding company or control person in
accordance with

Rule 13d-1(b)(1)(ii)(G);

(h) ¨

Savings association as defined in Section 3(b) of the Federal Deposit
Insurance Act (12 U.S.C. 1813);

(i) ¨

Church plan that is excluded from the definition of an investment
company under Section 3(c)(14) of the Investment Company Act (15 U.S.C. 80a-3);

(j) ¨ Non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J);
(k) ¨ Group, in accordance with Rule 13d-1(b)(1)(ii)(K).

If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J),
please

specify the type of institution: ________________________________________

Item 4. OWNERSHIP.

The information required by Items 4(a) – (c) is set forth
in Rows (5) – (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such
Reporting Person.

The percentages used herein are calculated based upon 390,636,531
shares of Common Stock reporting to be issued and outstanding in the Issuer’s Rule 424(b)(5) prospectus filed on November 23, 2016
following the completion of the offering reported therein.

Item 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: ý
Item 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
See Item 2.
Item 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.
Not applicable.
Item 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
Not applicable.

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