Gran Tierra Energy Inc. common stock is reported as being beneficially owned by a group of investment entities led by Equinox Partners Investment Management LLC and its principal, Sean M. Fieler. Collectively, these reporting persons beneficially own 3,474,582 Shares of Gran Tierra Energy Inc., representing approximately 9.8% of the outstanding common stock, based on 35,380,429 Shares outstanding as of July 31, 2026. Within this total, Equinox Partners, L.P. holds 1,407,074 Shares (about 4.0% of the class), Kuroto Fund LP holds 359,336 Shares (about 1.0%), and Mason Hill Partners, LP holds 299,625 Shares (about 0.9%). Equinox Partners Investment Management LLC and Mr. Fieler may be deemed to share voting and dispositive power over these holdings through their roles as investment adviser and controlling person, while each disclaims beneficial ownership for other purposes under Section 13 of the Exchange Act.
Positive
None.
Negative
None.
Key Figures
Collective beneficial ownership:3,474,582 SharesCollective ownership percentage:9.8%Shares outstanding:35,380,429 Shares+5 more
8 metrics
Collective beneficial ownership3,474,582 SharesShares of Gran Tierra Energy Inc. beneficially owned collectively by the reporting persons
Collective ownership percentage9.8%Percentage of Gran Tierra Energy Inc. common stock beneficially owned collectively
Shares outstanding35,380,429 SharesGran Tierra Energy Inc. shares outstanding as of July 31, 2026
Equinox Partners L.P. holdings1,407,074 SharesShares of Gran Tierra Energy Inc. beneficially owned by Equinox Partners L.P.
Equinox Partners L.P. ownership percentage4.0%Portion of Gran Tierra Energy Inc. outstanding shares held by Equinox Partners L.P.
Kuroto Fund LP holdings359,336 SharesShares of Gran Tierra Energy Inc. beneficially owned by Kuroto Fund LP
Mason Hill Partners LP holdings299,625 SharesShares of Gran Tierra Energy Inc. beneficially owned by Mason Hill Partners LP
Sean M. Fieler beneficial ownership3,474,582 SharesShares of Gran Tierra Energy Inc. beneficially owned by Sean M. Fieler
Key Terms
beneficial owner, dispositive power, Schedule 13D, Section 13 of the Act
4 terms
beneficial ownerregulatory
"may be deemed to beneficially own (as that term is defined in Rule 13d-3 under the Act)"
A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.
dispositive powerregulatory
"has shared voting and dispositive power"
Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.
Schedule 13Dregulatory
"constitutes an amendment to the Schedule 13D (as previously amended, the "Schedule 13D")"
A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.
Section 13 of the Actregulatory
"for the purposes of Section 13 of the Act, the beneficial owner"
FAQ
How much of Gran Tierra Energy Inc. (GTE) do the Equinox-related entities report owning?
The reporting group collectively beneficially owns 3,474,582 Shares of Gran Tierra Energy Inc., representing approximately 9.8% of the outstanding common stock, based on 35,380,429 Shares outstanding as of July 31, 2026.
What is Equinox Partners L.P.'s individual ownership stake in GTE?
Equinox Partners L.P. beneficially owns 1,407,074 Shares of Gran Tierra Energy Inc., which represents approximately 4.0% of the outstanding common stock, calculated using 35,380,429 Shares outstanding as of July 31, 2026.
What percentage of GTE does Sean M. Fieler report beneficially owning?
Sean M. Fieler is reported as beneficially owning 3,474,582 Shares of Gran Tierra Energy Inc., representing approximately 9.8% of the outstanding common stock, through entities he controls, while expressly disclaiming beneficial ownership for other purposes.
How many Gran Tierra Energy (GTE) shares are outstanding for these ownership calculations?
The reported ownership percentages are based on 35,380,429 Shares of Gran Tierra Energy Inc. outstanding as of July 31, 2026, as referenced in the company’s Quarterly Report on Form 10-Q filed on August 5, 2026.
What are the individual holdings of Kuroto Fund and Mason Hill Partners in GTE?
Kuroto Fund LP beneficially owns 359,336 Shares (about 1.0% of GTE’s outstanding stock), and Mason Hill Partners LP beneficially owns 299,625 Shares (about 0.9%), both included within the group’s total of 3,474,582 Shares.
Does Equinox Partners Investment Management LLC have sole or shared voting power over GTE shares?
Equinox Partners Investment Management LLC reports 0 shares with sole voting power and 3,474,582 Shares with shared voting and dispositive power, reflecting its role as investment adviser to the private funds and client accounts holding the shares.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
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)
08/13/2026
(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
3,474,582.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
3,474,582.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,474,582.00
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)
9.8 %
12
Type of Reporting Person (See Instructions)
IA
Comment for Type of Reporting Person: Note to Rows 6, 8 and 9: Includes 1,408,547 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
1,407,074.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,407,074.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,407,074.00
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)
4.0 %
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
359,336.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
359,336.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
359,336.00
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)
1.0 %
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
299,625.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
299,625.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
299,625.00
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)
0.9 %
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
3,474,582.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
3,474,582.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,474,582.00
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)
9.8 %
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 Number(s):
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:
This Schedule 13G constitutes an amendment to the Schedule 13D (as previously amended, the "Schedule 13D") filed by the undersigned with respect to shares of Common Stock, par value $0.001 per share, of Gran Tierra Energy
Inc.
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 3,474,582 Shares.
(ii) Equinox Partners beneficially owns 1,407,074 Shares.
(iii) Kuroto beneficially owns 359,336 Shares.
(iv) Mason Hill Partners beneficially owns 299,625 Shares.
(v) Mr. Fieler beneficially owns 3,474,582 Shares.
(vi) Collectively, the Reporting Persons beneficially own 3,474,582 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 3,474,582 Shares represents approximately 9.8% of the outstanding Shares.
(ii) Equinox Partners' beneficial ownership of 1,407,074 Shares represents approximately 4.0% of the outstanding Shares.
(iii) Kuroto's beneficial ownership of 359,336 Shares represents approximately 1.0% of the outstanding Shares.
(iv) Mason Hill Partners' beneficial ownership of 299,625 Shares represents approximately 0.9% of the outstanding Shares.
(v) Mr. Fieler's beneficial ownership of 3,474,582 Shares represents approximately 9.8% of the outstanding Shares.
(vi) Collectively, the Reporting Persons' beneficial ownership of 3,474,582 Shares represents approximately 9.8% 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.
Not Applicable
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)(K), so indicate under Item 3(k) 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.
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:
08/17/2026
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:
08/17/2026
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:
08/17/2026
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
