Mr. Gary Guidry reports

GRAN TIERRA ENERGY INC. ANNOUNCES FILING OF DEFINITIVE PROXY STATEMENT FOR SPECIAL MEETING OF STOCKHOLDERS TO CONSIDER APPROVAL OF SALE OF COLOMBIAN AND ECUADORIAN BUSINESSES

Gran Tierra Energy Inc. filed its definitive proxy statement with the U.S. Securities and Exchange Commission on Sept. 15, 2026, in connection with the company's special meeting of stockholders. At the special meeting, stockholders will be asked to approve the previously announced sale of Gran Tierra's Colombian and Ecuadorean businesses to Maurel & Prom for total consideration of approximately $1.33-billion, subject to adjustment, pursuant to the terms and conditions of the share sale and purchase agreement entered into on Aug. 5, 2026. Stockholders will also vote on an advisory proposal concerning certain transaction-related executive compensation and a proposal to adjourn the special meeting, if necessary, to solicit additional proxies.

Gran Tierra's board of directors unanimously recommends that its stockholders approve the share purchase agreement and the transactions contemplated thereby, including the sale. The approval of the sale proposal requires the affirmative vote of the holders of a majority of the outstanding shares of common stock entitled to vote thereon at the special meeting, voting in person or represented by proxy.

The sale continues to progress toward completion. On Sept. 22, 2026, Gran Tierra announced the successful completion of the solicitation of consents from holders of its 9.750 per cent senior secured amortizing notes due 2031 to effect certain proposed amendments to the indenture under which the notes were issued, satisfying a key condition to closing and enabling a subsidiary of Maurel & Prom to assume the notes at completion of the sale. With noteholder approval now in hand, stockholder approval at the special meeting is among the final steps remaining, alongside the regulatory approvals in Colombia and Ecuador.

Proxy materials are expected to be delivered to stockholders by Sept. 24, 2026. Stockholders who have not received their proxy materials, have questions or require assistance voting their shares should contact their broker, bank or other intermediary, as applicable, or Kingsdale Advisors, the company's strategic stockholder adviser and proxy solicitation agent, toll-free in North America at 855-476-7987, by call or text at 437-561-5013, or by e-mail at contactus@kingsdaleadvisors.com.

The special meeting will be held virtually on Oct. 9, 2026, at 10 a.m. Mountain Time (12 p.m. Eastern Time). The special meeting will be held in a virtual-only format by live webcast. No physical or in-person meeting will be held. Holders of shares as of the close of business on Sept. 14, 2026, the record date for the special meeting, will be able to attend the special meeting on-line, vote their shares electronically and submit questions during the meeting and at any adjournment or postponement thereof.

Stockholders are encouraged to read the proxy statement, the share purchase agreement attached as Annex A thereto, and the other annexes carefully and in their entirety and submit their proxy or voting instructions as promptly as possible and, in any event, no later than 10 a.m. Mountain Time on Oct. 8, 2026, by following the instructions included with their proxy materials. Stockholders who hold their shares in street name should follow the instructions received from their broker, bank or other intermediary to vote their shares.

The proxy statement and other documents filed by the company with the SEC are available free of charge at the SEC website. The proxy statement and additional information concerning the special meeting are also available at the company's website.

About Gran Tierra Energy Inc.

Gran Tierra Energy, together with its subsidiaries, is an independent international energy company currently focused on oil and natural gas exploration and production in Canada, Colombia and Ecuador. The company has entered into an exploration, development and production-sharing agreement in Azerbaijan, which remains subject to ratification. Upon completion of the sale, the company's producing operations will be focused on Canada, and the company will continue to pursue its interests in Azerbaijan and additional new growth opportunities that would further strengthen the company's portfolio. The company's common stock trades on the NYSE American, the Toronto Stock Exchange and the London Stock Exchange under the ticker symbol GTE.

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