Mr. Don Njegovan reports

OSISKO CRITICAL MINERALS CORPORATION UPSIZES PREVIOUSLY ANNOUNCED PRIVATE PLACEMENT OF SPECIAL WARRANTS TO C$250 MILLION

Osisko Metals Inc.'s Osisko Critical Minerals Corp. (OCMC) has upsized its previously announced best efforts private placement of special warrants of the corporation from aggregate gross proceeds of up to $100-million to up to $250-million.

Incoming chief executive officer John Burzynski commented:

"The decision to upsize our private placement from $100-million to $250-million is a result of overwhelming demand from investors for OCMC. This strong reception reflects confidence in our exploration portfolio and the significant opportunity we see in New Brunswick. We look forward to completing this upsized offering to capitalize this new venture and to advancing our aggressive exploration program on these highly prospective copper assets and our larger critical minerals strategy."

The private placement is more particularly described in the news release of Osisko Metals dated Sept. 16, 2026, titled "Osisko Critical Minerals Corporation Announces C$100 Million Private Placement of Special Warrants." The private placement will be led by Canaccord Genuity Corp., acting as lead agent and sole bookrunner, on behalf of a syndicate of agents. All other terms of the private placement remain as described in the prior news release.

Bennett Jones LLP is acting as legal adviser to Osisko Metals in connection with the private placement. Peterson McVicar LLP is acting as legal adviser to OCMC in connection with certain corporate matters. Cassels Brock & Blackwell LLP is acting as legal adviser to the agents in connection with the private placement.

Additional information

There is no certainty that the private placement will be completed on the terms proposed or at all. Completion of the private placement is subject to a number of conditions, including: completion of legal and tax structuring; completion of financial analysis; negotiation and execution of definitive documentation; and required regulatory approvals. There can be no assurance that any securities of the corporation will be listed on any stock exchange.

About Osisko Critical Minerals Corp.

Osisko Critical Minerals is a newly incorporated Canadian mineral exploration company focused on the discovery and development of copper and critical minerals deposits. The corporation's principal assets are the properties, comprising approximately 645 square kilometres of mineral claims in northern New Brunswick, Canada. The properties include the NB copper project, which hosts large-scale exploration targets for bulk-tonnage copper deposits in a geological setting analogous to the nearby Gaspe copper project. OCMC is led by Mr. Burzynski as chief executive officer and is a wholly owned subsidiary of Osisko Metals pending completion of the private placement.

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