Mr. Robert Bose reports

EXERCISE OF RESTRICTED SHARE UNITS

A total of 4.2 million restricted share units (RSUs) previously granted to several directors and service providers of Sintana Energy Inc. vested on June 27, 2026. Accordingly, the company reports that the following persons discharging managerial responsibilities (PDMRs) have converted RSUs into common shares.

Total voting rights

Application has been made for admission to trading on the Alternative Investment Market of a total of 4.2 million new common shares of no par value. Admission is expected on or about July 3, 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 (Financial Conduct Authority) disclosure guidance and transparency rules.

About Sintana Energy Inc.

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 licences across multiple jurisdictions. Sintana Energy is listed on the TSX-V in Canada under the symbol SEI, in the United Kingdom on the London Stock Exchange's AIM under the symbol SEI and in the United States on the OTCQX under the symbol SEUSF.