This announcement contains inside information for the purposes of Article 7 of the UK version
of Regulation (EU) No 596/2014 which is part of UK law by virtue of the European Union (Withdrawal) Act 2018, as amended ("MAR"). Upon the publication of this announcement
via a Regulatory Information Service, this inside information is now considered to be in the public domain.

3 March 2026 

Sintana Energy, Inc.

("Sintana Energy" or "the Company")

AREA OFF-1, Uruguay: commencement of 3D seismic acquisition

Sintana Energy Inc. (TSXV: SEI, AIM: SEI, OTCQX: SEUSF), the Atlantic- margin focused oil and gas company, is pleased to announce that the planned 3D seismic acquisition campaign on AREA OFF-1, offshore Uruguay, has commenced.

The AREA OFF-1 survey is being carried out by the contractor Viridien, using the BGP Prospector vessel, and will cover a total of approximately 4,300 km². Acquisition fieldwork will take place over two seasons: February-April 2026 and November 2026-April 2027, with most acquisition relevant to the key prospects on AREA OFF-1 expected to be completed in the first season. Fast-track results from seismic acquired in the first season are expected in Q4 2026, with full PSDM results from the first season expected in Q2 2027.

Sintana Energy holds a 40% non-operated interest in the AREA OFF-1 block, following the farm-out in 2025 of a 60% operating interest to an affiliate of Chevron Corporation ("Chevron"), and is carried for the total anticipated cost of the 3D seismic acquisition program.

It is noted that commencement of seismic acquisition follows rejection by courts in Uruguay of several attempted interventions by activist groups, demonstrating the depth of the upfront preparatory work for the campaign, and the robustness of Uruguay's environmental consultation and permitting process. Sintana Energy remains committed to all operations with which it is associated being in compliance with the highest health, safety, and environmental standards. 

Robert Bose, Chief Executive Officer of Sintana Energy, commented: "We are excited to see activity on AREA OFF-1 beginning so soon after completion of our acquisition of Challenger Energy in December 2025. 3D seismic acquisition is a key next step in defining the potential of Uruguay's offshore embedded within our Transatlantic portfolio, and which is underpinned by a relationship with Chevron that spans the conjugate margins. We look forward to providing further updates on progress over the coming quarters."

For further information, please contact:

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  

Forward-Looking Statements

The information provided in this announcement contains certain forward-looking statements and information (collectively, "forward-looking statements") within the meaning of applicable securities laws. Such forward-looking statements include, without limitation, forecasts, estimates, expectations and objectives for future operations that are subject to assumptions, risks and uncertainties, many of which are beyond the control of Sintana. Forward-looking statements are predictive in nature, depend upon or refer to future events or conditions, or include words such as "expect", "plan", "anticipate", "believe", "intend", "maintain", "continue to", "pursue", "design", "result in", "sustain" "estimate", "potential", "growth", "near-term", "long-term", "forecast", "contingent" and similar expressions, or are events or conditions that "will", "would", "may", "could" or "should" occur or be achieved. The forward-looking statements contained in this announcement speak only as of the date hereof and are expressly qualified by this cautionary statement.

Forward-looking statements are based upon, among other things, factors, expectations and assumptions that Sintana has made as at the date of this announcement regarding, among other things, the receipt of all applicable regulatory approvals and the anticipated schedule for receipt of funds pursuant to the Settlement Agreement.

Undue reliance should not be placed on the forward-looking statements because no assurance can be given that they will prove to be correct. Since forward-looking statements address future events and conditions, by their very nature they involve inherent risks and uncertainties. These risks include, but are not limited to, the ability of Sintana to receive all necessary regulatory approvals and third party satisfaction of all conditions of the Settlement Agreement.

Except as may be required by applicable securities laws, Sintana does not assume any obligation or intent to update publicly or revise any forward-looking statements made herein, whether as a result of new information, future events or otherwise.

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