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SCHEDULE 13D/A Filed 2026-08-07 Event 2026-08-05 SEC 0001140361-26-031878 →

Equinox Partners Investment Management LLC → Gran Tierra Energy Inc. GTE

Stake: 13.50% Shares: 4,781,471 CUSIP: 38500T200 Class: Common Stock, par value $0.001 per share

Item 4 — Purpose of Transaction

The Reporting Persons purchased the Shares based on the Reporting Persons' belief that the Shares, when purchased, were undervalued and represented an attractive investment opportunity. Depending upon overall market conditions, other investment opportunities available to the Reporting Persons, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Persons may endeavor to increase or decrease their position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Persons may deem advisable. Brad Virbitsky, a portfolio manager and partner at EPIM, was appointed to the Issuer's Board of Directors as an independent director, effective September 30, 2025, prompting the change from a 13G to a 13D filer. Mr. Virbitsky resigned from the Issuer's Board of Directors on March 12, 2026. No Reporting Person has any present plan or proposal which would relate to or result in any of the matters set forth in Item 4(a) through (j) of this Schedule 13D except as set forth herein or such as would occur upon or in connection with completion of, or following, any of the actions discussed herein. The Reporting Persons intend to review their investment in the Issuer on a continuing basis. Depending on various factors including, without limitation, the Issuer's financial position and investment strategy, the price levels of the Shares, conditions in the securities markets and general economic and industry conditions, the Reporting Persons may in the future take such actions with respect to their investment in the Issuer as they deem appropriate including, without limitation, engaging in communications with management and the Board of Directors, engaging in discussions with stockholders of the Issuer or third parties, including potential acquirers and service providers, about the Issuer and the Reporting Persons' investment, making proposals to the Issuer concerning changes to the capital allocation strategy, capitalization, ownership structure, including a sale of the Issuer as a whole or in parts, Board of Directors structure (including Board of Directors composition) or operations of the Issuer, purchasing additional Shares, selling some or all of their Shares, engaging in short selling of or any hedging or similar transaction with respect to the Shares, or changing their intention with respect to any and all matters referred to in Item 4.

Cross-References

Insider Activity (last 365d)
104 transactions
72 buys · 16 sales · 16 awards/exercises
Issuer Cluster
5 13D/G filings on this issuer
4 other filings besides this one
Filer Track Record
7 filings by this filer
6 other filings in the data moat
Short Interest · settle 2026-09-30
DTC 1.27
716,058 shares short · -4.8% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers
1 holder · $1.04M
Point72 Asset Mgmt

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-10-01 Morin Sebastien officer Award 302 $9.67 $3K
2026-09-24 Wade Brooke N. director Option exercise 1,382 $7.60 $11K
2026-06-09 LM Asset Management Inc. 10%+ owner Buy 51,000 $7.22 $368K
2026-06-05 LM Asset Management Inc. 10%+ owner Buy 35,000 $7.62 $267K
2026-05-11 LM Asset Management Inc. 10%+ owner Buy 12,000 $8.88 $107K
2026-05-07 LM Asset Management Inc. 10%+ owner Buy 18,000 $8.30 $149K
2026-05-05 LM Asset Management Inc. 10%+ owner Buy 45,000 $9.30 $418K
2026-05-01 LM Asset Management Inc. 10%+ owner Buy 52,000 $9.10 $473K
2026-05-01 Morin Sebastien officer Award 335 $9.17 $3K
2026-05-01 Guidry Gary director, officer Award 469 $9.17 $4K
2026-05-01 Evans Jim officer Award 151 $9.17 $1K
2026-05-01 Abraham Phillip D officer Award 268 $9.17 $2K
2026-04-16 Morin Sebastien officer Award 391 $7.78 $3K
2026-04-16 Evans Jim officer Award 176 $7.78 $1K
2026-04-16 Guidry Gary director, officer Award 547 $7.78 $4K
2026-04-16 Abraham Phillip D officer Award 313 $7.78 $2K
2026-04-16 Morin Sebastien officer Award 307 $7.78 $2K
2026-04-16 Evans Jim officer Award 138 $9.78 $1K
2026-04-07 Ellson Ryan officer Option exercise 130,500 — —
2026-04-07 Abraham Phillip D officer Option exercise 34,103 — —
2026-04-07 Morin Sebastien officer Option exercise 145,816 — —
2026-04-07 Guidry Gary director, officer Option exercise 190,975 — —
2026-04-07 Evans Jim officer Option exercise 76,162 — —
2026-04-07 Morin Sebastien officer Option exercise 145,816 — —
2026-04-07 Guidry Gary director, officer Option exercise 190,975 — —
Showing 25 of 104

Other 13D/G Filings on Gran Tierra Energy Inc.

FiledFormFilerStakeShares
2026-09-17 SCHEDULE 13G/A Equinox Partners Investment Management LLC — — view →
2026-08-17 SCHEDULE 13G Equinox Partners Investment Management LLC — — view →
2026-08-13 SCHEDULE 13D/A Equinox Partners Investment Management LLC 11.70% 4,149,531 view →
2025-11-07 SCHEDULE Equinox Partners Investment Management LLC 16.40% 5,796,370 view →

Other Filings by Equinox Partners Investment Management LLC

FiledFormIssuerStakeShares
2026-10-13 SCHEDULE 13D/A Silvercrest Asset Management Group Inc. — 690,741 view →
2026-09-30 SCHEDULE 13D Silvercrest Asset Management Group Inc. 7.10% 554,736 view →
2026-09-17 SCHEDULE 13G/A Gran Tierra Energy Inc. — — view →
2026-08-17 SCHEDULE 13G Gran Tierra Energy Inc. — — view →
2026-08-13 SCHEDULE 13D/A Gran Tierra Energy Inc. 11.70% 4,149,531 view →
2025-11-07 SCHEDULE GRAN TIERRA ENERGY INC. GTE 16.40% 5,796,370 view →

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