TORONTO, ON / ACCESS Newswire / June 30, 2026 / Sintana Energy Inc. (TSXV:SEI)(AIM:SEI)(OTCQX:SEUSF) ("Sintana" or the "Company") reports that a total of 4,200,000 restricted share units ("RSUs") previously granted to several directors and service providers of the Company vested on June 27, 2026. Accordingly, the Company reports that the following Persons Discharging Managerial Responsibilities ("PDMRs") have converted RSUs into Common Shares:

Notes:

(1) Mr. Katti holds the legal and beneficial title in 1,250,000 Common Shares. Mr. Katti is also the beneficial owner of 21,840,001 Common Shares held by Grisham Assets Corp.

(2) Mr. Bose holds the legal and beneficial title in 2,813,503 Common Shares. Mr. Bose is also regarded as the beneficial owner of 24,613,865 Common Shares held by Charlestown Energy Partners LLC given his association with that entity.

(3) Calculated based on an aggregate of 560,432,493 common shares of the Company issued and outstanding.

Total Voting Rights

Application has been made for admission to trading on the AIM of a total of 4,200,000 new Common Shares of no-par value ("Admission"). Admission is expected on or about 3 July 2026. Subject to Admission, the new Common Shares will be issued and listed on both AIM and TSX Venture Exchange, and will rank pari passu with the Company's existing Common Shares. Following Admission, the Company's issued share capital will consist of 560,432,493 Common Shares, with each Common Share carrying the right to one vote. The Company does not hold any Common Shares in treasury.

This figure of 560,432,493 Common Shares may therefore be used by shareholders in the Company, as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change in their interest in, the share capital of the Company under the FCA's Disclosure Guidance and Transparency Rules.

About Sintana Energy

Sintana Energy is an Atlantic Margin-focused oil and gas company, holding interests in a diverse portfolio of high-impact assets that spans the Southern Atlantic conjugate margin. The Company's current portfolio is strategically positioned in the emerging frontier geographies of Namibia, Uruguay and Angola, with additional legacy assets in Colombia and The Bahamas. Led by an experienced team, Sintana Energy is partnered with major industry players, and benefits from significant carry support, on key licenses across multiple jurisdictions. Sintana Energy is listed on the TSX-V in Canada under the symbol "SEI", in the United Kingdom on the LSE-AIM under the symbol "SEI" and in the U.S. on the OTCQX under the symbol "SEUSF".

For further information, please visit sintanaenergy.com

NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICES PROVIDER (AS THAT TERM IS DEFINED IN THE POLICIES OF THE TSX VENTURE EXCHANGE) ACCEPTS RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS RELEASE.

SOURCE: Sintana Energy Inc.