Gran Tierra Energy Inc. (GTE) received an amended Schedule 13G indicating that a group of investment entities led by Equinox Partners Investment Management LLC and Sean M. Fieler collectively report beneficial ownership of 1,533,793 common shares. Based on 35,380,429 shares outstanding as of July 31, 2026, this represents approximately 4.3% of the company’s common stock, which is below the 5% threshold for larger blockholders. The shares are held across Equinox Partners, L.P., Kuroto Fund LP, Mason Hill Partners, LP and certain client accounts, with the reporting persons having shared voting and dispositive power and no sole power. The reporting persons expressly disclaim beneficial ownership of shares held in client accounts for purposes other than Section 13 of the Exchange Act.
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Key Figures
Shares beneficially owned collectively:1,533,793 sharesCollective ownership percentage:4.3%Shares outstanding:35,380,429 shares+4 more
7 metrics
Shares beneficially owned collectively1,533,793 sharesCollective beneficial ownership reported by all reporting persons
Collective ownership percentage4.3%Portion of Gran Tierra Energy Inc. common stock based on 35,380,429 shares outstanding
Shares outstanding35,380,429 sharesGran Tierra Energy Inc. common stock outstanding as of July 31, 2026
Equinox Partners, L.P. holdings611,231 sharesBeneficial ownership of Gran Tierra Energy Inc. common stock
Kuroto Fund LP holdings156,116 sharesBeneficial ownership of Gran Tierra Energy Inc. common stock
Mason Hill Partners, LP holdings155,102 sharesBeneficial ownership of Gran Tierra Energy Inc. common stock
EPIM and Fieler ownership percentage4.3%Each of EPIM and Sean M. Fieler reports beneficial ownership of 1,533,793 shares
"may be deemed to beneficially own (as that term is defined in Rule 13d-3"
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
shared voting powerregulatory
"Shared Voting Power 1,533,793.00"
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
shared dispositive powerregulatory
"Shared Dispositive Power 1,533,793.00"
Schedule 13Gregulatory
"filed this schedule pursuant to 1(b)(1)(ii)(J)"
A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.
investment advisorfinancial
"EPIM's principal business is serving as an investment advisor to certain private"
An investment advisor is a person or firm that provides personalized guidance on buying, selling and managing investments and often oversees client portfolios for a fee. For investors this matters because the advisor shapes risk, costs and long-term returns, and is typically required by law to act in the client’s best interests — think of them as a financial coach or GPS that helps navigate choices and avoid costly detours.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What percentage of Gran Tierra Energy Inc. (GTE) does the Equinox Partners group currently report owning?
The reporting group led by Equinox Partners Investment Management LLC reports beneficial ownership of 1,533,793 shares of Gran Tierra Energy Inc., representing approximately 4.3% of the 35,380,429 shares outstanding as of July 31, 2026.
How many Gran Tierra Energy Inc. (GTE) shares does each Equinox-related fund beneficially own?
Equinox Partners, L.P. beneficially owns 611,231 shares, Kuroto Fund LP owns 156,116 shares, and Mason Hill Partners, LP owns 155,102 shares of Gran Tierra Energy Inc. common stock.
Who are the reporting persons in this Schedule 13G/A for GTE?
The reporting persons are Equinox Partners Investment Management LLC, Equinox Partners, L.P., Kuroto Fund LP, Mason Hill Partners, LP, and Sean M. Fieler, who collectively report beneficial ownership of 1,533,793 shares of Gran Tierra Energy Inc.
Do the Equinox reporting persons have sole or shared voting power over GTE shares?
The reporting persons report 0 shares with sole voting or dispositive power and 1,533,793 shares with shared voting and shared dispositive power over Gran Tierra Energy Inc. common stock.
Why does the filing state ownership of 5 percent or less of Gran Tierra Energy Inc.?
The filing indicates ownership of 5 percent or less of Gran Tierra Energy Inc. because the reporting persons’ aggregate beneficial ownership of 1,533,793 shares represents only about 4.3% of the 35,380,429 shares outstanding as of July 31, 2026.
What disclaimer about beneficial ownership do Equinox Partners and Sean M. Fieler make regarding GTE shares?
Equinox Partners Investment Management LLC and Sean M. Fieler state that they may be deemed to beneficially own shares held by certain funds and client accounts but disclaim beneficial ownership of such shares for all purposes other than Section 13 of the Exchange Act.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 1)
Gran Tierra Energy Inc.
(Name of Issuer)
Common Stock, par value $0.001 per share (the "Shares")
(Title of Class of Securities)
38500T200
(CUSIP Number)
09/11/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
38500T200
1
Names of Reporting Persons
Equinox Partners Investment Management LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,533,793.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,533,793.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,533,793.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.3 %
12
Type of Reporting Person (See Instructions)
IA
Comment for Type of Reporting Person: 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).
SCHEDULE 13G
CUSIP Number(s):
38500T200
1
Names of Reporting Persons
Equinox Partners, L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
611,231.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
611,231.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
611,231.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
1.7 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
CUSIP Number(s):
38500T200
1
Names of Reporting Persons
Kuroto Fund LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
156,116.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
156,116.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
156,116.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.4 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
CUSIP Number(s):
38500T200
1
Names of Reporting Persons
Mason Hill Partners, LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
155,102.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
155,102.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
155,102.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.4 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
CUSIP Number(s):
38500T200
1
Names of Reporting Persons
Sean M. Fieler
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,533,793.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,533,793.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,533,793.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.3 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person: 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).
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Gran Tierra Energy Inc.
(b)
Address of issuer's principal executive offices:
500 Centre Street S.E., Calgary, Alberta T2G 1A6 Canada
Item 2.
(a)
Name of person filing:
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.
(b)
Address or principal business office or, if none, residence:
The principal business office of each of the Reporting Persons is Three Stamford Plaza, 301 Tresser Blvd, 13th Fl., Stamford, CT 06901.
(c)
Citizenship:
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.
(d)
Title of class of securities:
Common Stock, par value $0.001 per share (the "Shares")
(e)
CUSIP No.:
38500T200
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
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.
(b)
Percent of class:
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.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
See Cover Pages Items 5-9.
(ii) Shared power to vote or to direct the vote:
See Cover Pages Items 5-9.
(iii) Sole power to dispose or to direct the disposition of:
See Cover Pages Items 5-9.
(iv) Shared power to dispose or to direct the disposition of:
See Cover Pages Items 5-9.
Item 5.
Ownership of 5 Percent or Less of a Class.
Ownership of 5 percent or less of a class
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
Not Applicable
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
See Exhibit A to the Schedule 13G filed by the Reporting Persons with the Securities and Exchange Commission on August 17, 2026.
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
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.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Equinox Partners Investment Management LLC
Signature:
/s/ Sean M. Fieler
Name/Title:
Sean M. Fieler, Manager
Date:
09/17/2026
Equinox Partners, L.P.
Signature:
/s/ Sean M. Fieler
Name/Title:
Sean M. Fieler, Manager of Equinox Partners Investment Management LLC, the Investment Manager of Equinox Partners, L.P.
Date:
09/17/2026
Kuroto Fund LP
Signature:
/s/ Sean M. Fieler
Name/Title:
Sean M. Fieler, Manager of Equinox Partners Investment Management LLC, the Investment Manager of Kuroto Fund LP
Date:
09/17/2026
Mason Hill Partners, LP
Signature:
/s/ Sean M. Fieler
Name/Title:
Sean M. Fieler, Manager of Equinox Partners Investment Management LLC, the Investment Manager of Mason Hill Partners, LP
