X0202 SCHEDULE 13G/A 0000938552 XXXXXXXX LIVE 1 Common Stock, par value $0.001 per share (the "Shares") 09/11/2026 0001273441 Gran Tierra Energy Inc. 38500T200 500 Centre Street S.E. Calgary A0 T2G 1A6 Rule 13d-1(c) Equinox Partners Investment Management LLC a DE 0 1533793 0 1533793 1533793 4.3 IA Note to Rows 6, 8, and 9: Includes 611,344 shares of Common Stock, par value $0.001 per share (the "Shares") of Gran Tierra Energy Inc. (the "Issuer") held in one or more client accounts over which Equinox Partners Investment management LLC, as investment advisor, has shared voting and dispositive power. The filing of this statement should not be deemed as admission that Equinox partners Investment Management LLC is, for the purposes of Section 13 of the Act, the beneficial owner of the Shares held in such client account(s). Equinox Partners, L.P. a DE 0 611231 0 611231 611231 1.7 PN Kuroto Fund LP a DE 0 156116 0 156116 156116 0.4 PN Mason Hill Partners, LP a DE 0 155102 0 155102 155102 0.4 PN Sean M. Fieler a X1 0 1533793 0 1533793 1533793 4.3 IN Note to Rows 6, 8, and 9: See Footnote 1 on page 2. The filing of this statement should not be deemed an admission that Mr. Fieler is, for the purposes of Section 13 of the Act, the beneficial owner of the Shares held in such client account(s). Gran Tierra Energy Inc. 500 Centre Street S.E., Calgary, Alberta T2G 1A6 Canada The names of the persons jointly filing this statement on Schedule 13G (collectively, the "Reporting Persons") are: * Equinox Partners Investment Management LLC, a Delaware limited liability company ("EPIM"). * Equinox Partners, L.P., a Delaware limited partnership ("Equinox Partners"). * Kuroto Fund LP, a Delaware limited partnership ("Kuroto"). * Mason Hill Partners, LP, a Delaware limited partnership ("Mason Hill Partners"). * Sean M. Fieler, a United States Citizen ("Mr. Fieler"). EPIM's principal business is serving as an investment advisor to certain private investment funds, including Equinox Partners, Kuroto, Mason Hill Partners, and other client accounts. Each of Equinox Partners, Kuroto, and Mason Hill Partners is a private investment fund. Mr. Fieler owns a controlling interest in, and is the managing member of, EPIM. The principal business office of each of the Reporting Persons is Three Stamford Plaza, 301 Tresser Blvd, 13th Fl., Stamford, CT 06901. Each of EPIM, Kuroto, Equinox Partners, and Mason Hill Partners is organized under the laws of the State of Delaware. Mr. Fieler is a citizen of the United States. Y Each of EPIM and Mr. Fieler may be deemed to beneficially own (as that term is defined in Rule 13d-3 under the Act) the Shares which each of Equinox Partners, Kuroto, and Mason Hill Partners directly beneficially owns. Each of EPIM and Mr. Fieler disclaims beneficial ownership of such Shares for all other purposes. EPIM acts as an investment advisor to certain client accounts and, by virtue of investment management agreements with these clients, has voting and dispositive power over the Shares held in such client accounts. Mr. Fieler is the managing member of, and owns a controlling interest in, EPIM. The filing of this statement should not be deemed an admission that EPIM or Mr. Fieler is, for the purposes of Section 13 of the Act, the beneficial owner of the Shares held in such client accounts. (a) Amount beneficially owned: (i) EPIM beneficially owns 1,533,793 Shares. (ii) Equinox Partners beneficially owns 611,231 Shares. (iii) Kuroto beneficially owns 156,116 Shares. (iv) Mason Hill Partners beneficially owns 155,102 Shares. (v) Mr. Fieler beneficially owns 1,533,793 Shares. (vi) Collectively, the Reporting Persons beneficially own 1,533,793 Shares. The following percentages are based on 35,380,429 Shares outstanding as of July 31, 2026 as disclosed in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 5, 2026. (i) EPIM's beneficial ownership of 1,533,793 Shares represents approximately 4.3% of the outstanding Shares. (ii) Equinox Partners' beneficial ownership of 611,231 Shares represents approximately 1.7% of the outstanding Shares. (iii) Kuroto's beneficial ownership of 156,116 Shares represents approximately 0.4% of the outstanding Shares. (iv) Mason Hill Partners' beneficial ownership of 155,102 Shares represents approximately 0.4% of the outstanding Shares. (v) Mr. Fieler's beneficial ownership of 1,533,793 Shares represents approximately 4.3% of the outstanding Shares. (vi) Collectively, the Reporting Persons' beneficial ownership of 1,533,793 Shares represents approximately 4.3% of the outstanding Shares. See Cover Pages Items 5-9. See Cover Pages Items 5-9. See Cover Pages Items 5-9. See Cover Pages Items 5-9. N Y Y Y N See Exhibit A to the Schedule 13G filed by the Reporting Persons with the Securities and Exchange Commission on August 17, 2026. Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Equinox Partners Investment Management LLC /s/ Sean M. Fieler 09/17/2026 Equinox Partners, L.P. /s/ Sean M. Fieler 09/17/2026 Kuroto Fund LP /s/ Sean M. Fieler 09/17/2026 Mason Hill Partners, LP /s/ Sean M. Fieler 09/17/2026 Sean M. Fieler /s/ Sean M. Fieler 09/17/2026