REG-Gran Tierra Energy Inc. Appoints New Director

Gran Tierra EnergyAnnouncement

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CALGARY, Alberta, Sept. 30, 2025 (GLOBE NEWSWIRE) -- Gran Tierra Energy Inc.
(“Gran Tierra” or the “Company”) (NYSE American:GTE)(TSX:GTE)(LSE:GTE)
is pleased to announce the appointment of Brad Virbitsky to the Company’s
Board of Directors as an independent director, effective September 30, 2025.

Mr. Virbitsky is a portfolio manager and partner at Equinox Partners LLC, a
Connecticut-based investment firm with over 30 years of history in natural
resources and emerging markets. Mr. Virbitsky has over a decade of experience
working with management teams and boards to advise on long-term corporate and
financial strategies. He has developed deep expertise in the global energy
sector and has traveled extensively through the emerging markets conducting
due diligence and assessing investment opportunities.

In addition to his role at Equinox, Mr. Virbitsky has served as a director of
Crew Energy, where he represented Equinox’s significant investment and
participated in the governance and audit committees, as well as the process
that resulted in the successful sale of Crew to Tourmaline at a 70% premium
through an all-stock corporate transaction. He also currently serves on the
board of Canadian Premium Sand.

Mr. Virbitsky earned a Bachelor of Arts in Philosophy with Honors from
Princeton University, where he also obtained a Certificate in Finance from the
Bendheim Center. He has also completed additional professional development
including S&P valuation courses and oil and gas reserve analysis training with
Sproule.

Gran Tierra’s Board Chair Robert Hodgins stated:

“We are very pleased to welcome Brad Virbitsky to Gran Tierra’s Board of
Directors. He brings deep expertise in global energy markets, investment
strategy, and corporate governance, developed through extensive experience
working with companies across multiple regions and sectors. We believe
Brad’s insights and perspectives will be highly valuable to the Board as we
continue to advance Gran Tierra’s strategy and create long-term shareholder
value.”

About Gran Tierra Energy Inc.

Gran Tierra Energy Inc., 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 is
currently developing its existing portfolio of assets in Canada, Colombia and
Ecuador and will continue to pursue 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. Additional information concerning
Gran Tierra is available at www.grantierra.com. Except to the extent expressly
stated otherwise, information on the Company’s website or accessible from
our website or any other website is not incorporated by reference into and
should not be considered part of this press release. Investor inquiries may be
directed to info@grantierra.com or (403) 265-3221.

Gran Tierra’s filings with the U.S. Securities and Exchange Commission (the
“SEC”) are available on the SEC website at http://www.sec.gov. The
Company’s Canadian securities regulatory filings are available on SEDAR+ at
http://www.sedarplus.ca and UK regulatory filings are available on the
National Storage Mechanism website at
https://data.fca.org.uk/#/nsm/nationalstoragemechanism.

Contact Information

For investor and media inquiries please contact:

Gary Guidry
President & Chief Executive Officer

Ryan Ellson
Executive Vice President & Chief Financial Officer

+1-403-265-3221
info@grantierra.com