Mr. Jean-Philippe Mai reports

DUNDEE SUSTAINABLE TECHNOLOGIES ANNOUNCES COMPLETION OF AMALGAMATION

Dundee Sustainable Technologies Inc. has completed the previously announced amalgamation under Section 181 of the Canada Business Corporations Act involving the corporation and 17799799 Canada Inc. (the purchaser), a newly incorporated and wholly owned subsidiary of Dundee Corp., the corporation's parent company.

"With the completion of this transaction, we will create a more streamlined platform from which to advance DST's business," said Jonathan Goodman, president and chief executive officer of Dundee. "Full ownership allows us to better align operations with a clear focus on long-term sustainability of the business."

Pursuant to the amalgamation, Dundee, through the purchaser, acquired all issued and outstanding subordinate voting shares and multiple voting shares of the corporation not already held by Dundee. As a result of the amalgamation, the entity resulting from the amalgamation and continuing under the name Dundee Sustainable Technologies (Amalco) has become a wholly owned subsidiary of Dundee.

The cash consideration for the subordinate voting shares has been remitted to Computershare Investor Services Inc., as depositary, and payments will be made to the shareholders as soon as reasonably practicable, in accordance with the terms of the amalgamation and upon proper deposit of their subordinate voting shares.

As the corporation has become a privately held company, the corporation applied to cease to be a reporting issuer under Canadian securities laws and to have the subordinate voting shares voluntarily delisted from the Canadian Securities Exchange.

Early warning disclosure

Pursuant to the requirements of National Instrument 62-104, Take-Over Bids and Issuer Bids, and National Instrument 62-103, The Early Warning System and Related Take-Over Bid and Insider Reporting Issues, Dundee will file an early warning report in accordance with applicable securities laws, which will be made available on the corporation's issuer profile on SEDAR+.

Immediately prior to closing of the amalgamation, Dundee (through the purchaser) beneficially owned and exercised control and direction over, directly or indirectly, an aggregate of 49,526,218 subordinate voting shares and 2.5 million multiple voting shares, representing 77.15 per cent of the then issued and outstanding subordinate voting shares, and 100 per cent of the then issued and outstanding multiple voting shares. Dundee did not beneficially own or exercise control or direction over, directly or indirectly, any convertible securities of the corporation.

Pursuant to the amalgamation, Dundee (through the purchaser) acquired ownership of an additional 14,669,556 subordinate voting shares (for aggregate cash consideration of $440,086.68), which, together with the 49,526,218 subordinate voting shares and 2.5 million multiple voting shares beneficially owned by Dundee, represented 100 per cent of the then issued and outstanding subordinate voting shares, and 100 per cent of the then issued and outstanding multiple voting shares. All of the subordinate voting shares and multiple voting shares were cancelled pursuant to the amalgamation.

Upon completion of the amalgamation, Dundee acquired beneficial ownership of an aggregate of 201 common shares in the capital of Amalco, representing 100 per cent of the issued and outstanding share capital of Amalco, and Amalco became a wholly owned subsidiary of Dundee.

The purpose of Dundee's acquisition of the shares of the corporation was to facilitate the corporation's going-private transaction, as is more particularly described in the management information circular of the corporation dated May 1, 2026, which is available on the corporation's SEDAR+ profile. As noted above, the corporation has applied to cease to be a reporting issuer under Canadian securities laws and to have the subordinate voting shares voluntarily delisted from the Canadian Securities Exchange.

To obtain a copy of the early warning report filed by Dundee, please contact Dundee, legal department, 80 Richmond St. W, Suite 2000, Toronto, Ont., M5H 2A4, telephone: 416-365-5172.

About Dundee Sustainable Technologies Inc.

The corporation is engaged in the development and commercialization of environment-friendly technologies for the treatment of materials in the mining industry. Through the development of patented, proprietary processes, Dundee Sustainable Technologies extracts precious and base metals from mineralized material, concentrates and tailings, while stabilizing contaminants such as arsenic, which could not otherwise be extracted or stabilized with conventional processes because of metallurgical issues or environmental considerations.

Dundee Sustainable Technologies has filed, published and was granted patents for the GlassLock Process and CLEVR Process in numerous countries.

We seek Safe Harbor.