Initial Statement of Beneficial Ownership

Daniel Lau, a 10% owner of Gran Tierra Energy Inc., has filed an initial statement of beneficial ownership. The filing details his direct and indirect ownership of the company's common stock. Lau directly owns 240,000 shares. His indirect ownership includes 3,171,200 shares held through private investment funds managed by an investment advisory firm where he is a control person, and 145,000 shares held through companies where he is a director and controlling shareholder. He disclaims beneficial ownership of the indirectly held shares except to the extent of his pecuniary interest. The report was signed on December 19, 2025, for the period of December 17, 2025.