REG-Gran Tierra Energy Inc. Announces Normal Course Issuer Bid and Automatic Share Purchase Plan

Gran Tierra EnergyAnnouncement

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Gran Tierra Energy Inc. Announces Normal Course Issuer Bid and Automatic Share
Purchase Plan

CALGARY, Alberta, Nov. 03, 2025 (GLOBE NEWSWIRE) -- Gran Tierra Energy Inc.
(“Gran Tierra”) (NYSE American: GTE)(TSX: GTE)(LSE: GTE), today announces
that the Toronto Stock Exchange (“TSX”) has approved its notice of
intention to make a normal course issuer bid (the “Bid”) for its shares of
common stock (the “Shares”). As of October 31, 2025, there were 35,295,753
Shares issued and outstanding and the public float was 29,257,195 Shares.
Pursuant to the Bid, Gran Tierra will be able to purchase for cancellation up
to 2,925,720 Shares, representing 10% of the public float, at prevailing
market prices at the time of purchase, through the facilities of the TSX, the
NYSE American (the “NYSE”) or alternative trading platforms in Canada or
the United States, if eligible, or by such other means as may be permitted by
the TSX, the NYSE and applicable securities laws for a one year period
commencing on November 6, 2025 and ending on November 5, 2026. Gran Tierra has
also entered into an Automatic Share Purchase Plan (the “ASPP”) in
connection with the Bid. The ASPP is intended to allow for the purchase of
Shares under the Bid when Gran Tierra would ordinarily not be permitted to
purchase Shares due to regulatory restrictions and customary self-imposed
blackout periods.

Gran Tierra may purchase up to 12,171 Shares during any trading day, which
represents approximately 25% of 48,687, which represents the average daily
trading volume on the TSX for the most recently completed six calendar months
prior to the TSX’s acceptance of the notice of the Bid. Gran Tierra may
effect repurchases from time to time in the open market or in negotiated
transactions off the market at prevailing market prices at the time of
purchase.

Management of Gran Tierra believes that the Shares, at times, have been
trading in a price range which does not adequately reflect their value in
relation to Gran Tierra’s current operations, growth prospects and financial
position. At such times, the purchase of Shares for cancellation or to satisfy
awards granted under Gran Tierra’s Long Term Equity Incentive Plan may be
advantageous to stockholders by increasing the value of the Shares.

Within the past twelve months, Gran Tierra purchased 1,180,752 Shares at a
volume weighted average price of USD$5.61 under a previously approved normal
course issuer bid through the facilities of the TSX, the NYSE and eligible
alternative trading platforms in Canada and the United States permitting the
purchase of up to 3,545,872 Shares, which expires on November 5, 2025.

Pursuant to the ASPP, outside of a trading blackout period, Gran Tierra may,
but is not required to, instruct the designated broker to make purchases under
the Bid in accordance with the terms of the ASPP. Such purchases will be
determined by the designated broker at its sole discretion based on purchasing
parameters set by Gran Tierra in accordance with the rules of the TSX, the
NYSE, applicable securities laws, including Rule 10b-18 under the U.S.
Securities Exchange Act of 1934, as amended, and the terms of the ASPP. The
ASPP has been pre-cleared by the TSX and will be implemented on November 6,
2025.

Outside of blackout periods, Shares may be purchased under the Bid based on
management’s discretion, in compliance with the rules of the TSX, the NYSE
and applicable securities laws. Purchases made under the ASPP will be included
in computing the number of Shares purchased under the Bid.

As previously announced on February 20, 2024, Gran Tierra was granted an
exemptive relief order by the Canadian securities regulators which permits
Gran Tierra to purchase up to 10% of its “public float” (within the
meaning of the rules of the TSX) of the Shares through the NYSE and other
trading systems based in the United States as part of any NCIB implemented in
the 36 months following the date of the exemption order, being February 12,
2024. Gran Tierra will therefore not be limited on such trading platforms to
purchasing 5% of its outstanding Shares at the beginning of any 12-month
period as Canadian securities laws would otherwise provide. The exemptive
relief expires February 12, 2027 and is conditional upon, among other things,
purchases being made in compliance with applicable U.S. rules, the TSX rules
applicable to a normal course issuer bid, National Instrument 23-101 - Trading
Rules, and at a price not higher than the market price at the time of
purchase.

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. Gran Tierra is
currently developing its existing portfolio of assets in Canada, Colombia and
Ecuador and will continue to pursue additional growth opportunities that would
further strengthen Gran Tierra’s portfolio. Gran Tierra’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. Information on Gran Tierra does not
constitute a part of this press release. Investor inquiries may be directed to
info@grantierra.com or (403) 265-3221.

Gran Tierra’s U.S. Securities and Exchange Commission (“SEC”) filings
are available on the SEC website at www.sec.gov. Gran Tierra’s Canadian
securities regulatory filings are available on SEDAR+ at www.sedarplus.com and
UK regulatory filings are available on the National Storage Mechanism (the
“NSM”) website at https://data.fca.org.uk/#/nsm/nationalstoragemechanism.
Gran Tierra’s filings on the SEC, SEDAR+ and NSM websites are not
incorporated by reference into this press release.

Forward-Looking Statements and Advisories

This press release contains statements about future events that constitute
forward-looking statements within the meaning of the United States Private
Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of
1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as
amended, and forward looking information within the meaning of applicable
Canadian securities laws (collectively, “forward-looking statements”).
Such forward-looking statements include, but are not limited to, the belief of
Gran Tierra’s management that the Bid will be advantageous to stockholders,
potential purchases of the Shares for cancellation or redeployment under Gran
Tierra’s Long Term Equity Incentive Plan, the potential value of the Bid for
Gran Tierra’s stockholders and other benefits to be derived from the Bid.
There can be no assurance as to how many Shares, if any, will ultimately be
acquired by Gran Tierra.

The forward-looking statements contained in this news release are subject to
risks, uncertainties and other factors that could cause actual results or
outcomes to differ materially from those contemplated by the forward-looking
statements, including, among others, unexpected changes in general market and
economic conditions. Accordingly, readers should not place undue reliance on
the forward-looking statements contained herein. Further information on
potential factors that could affect Gran Tierra are included in risks detailed
from time to time in Gran Tierra’s reports filed with the Securities and
Exchange Commission, including, without limitation, under the caption “Risk
Factors” in Gran Tierra’s Annual Report on Form 10-K filed February 24,
2025 and its subsequent quarterly reports on Form 10-Q. These filings are
available on a Website maintained by the SEC at http://www.sec.gov and on
SEDAR+ at www.sedarplus.com.

All forward-looking statements are made as of the date of this press release
and the fact that this press release remains available does not constitute a
representation by Gran Tierra that Gran Tierra believes these forward-looking
statements continue to be true as of any subsequent date. Actual results may
vary materially from the expected results expressed in forward-looking
statements. Gran Tierra disclaims any intention or obligation to update or
revise any forward-looking statements, whether as a result of new information,
future events or otherwise, except as expressly required by applicable
securities laws. Gran Tierra’s forward-looking statements are expressly
qualified in their entirety by this cautionary statement.

No Offer or Solicitation

The information in this press release is for informational purposes only and
is neither an offer to purchase, nor a solicitation of an offer to sell,
subscribe for or buy any securities or otherwise, nor shall there be any
purchase in any jurisdiction in contravention of applicable law.

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