SCHEDULE 13D/A

Gran Tierra Energy Inc

Common Stock, par value $0.001 per share · CUSIP: 38500T200

Event date: 2025-11-04

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Equinox Partners Investment Management LLCReported CIK 0000938552

  Shares: 5,796,370 · Class: 16.4%

• Equinox Partners, L.P.Reported CIK 0000933897

  Shares: 2,396,343 · Class: 6.8%

• Kuroto Fund LPReported CIK 0001080716

  Shares: 616,254 · Class: 1.8%

• Mason Hill Partners, LPReported CIK 0001421771

  Shares: 498,986 · Class: 1.4%

• Sean M. Fieler

  Shares: 5,796,370 · Class: 16.4%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.