Osisko Gold Closes Previously Announced US$30 million Strategic Equity Investment by Trafigura

Osisko Gold Group Inc. (NYSE: OGG, TSXV: OGG) ("Osisko Gold" or the "Company") is pleased to announce the closing of its previously announced equity investment by Urion Investments Holdings Limited ("Urion"), an affiliate of Trafigura Canada Limited, as disclosed in the news release of the Company dated September 14, 2026 entitled "Osisko Gold Announces Formal Construction Decision and Development Update for the Cariboo Gold Project" (the "Equity Investment"). Pursuant to the Equity Investment, the Company issued an aggregate of 9,554,141 common shares of the Company (each, a "Common Share") to Urion at a price of US$3.14 per Common Share, representing a 10% premium to the five-day volume weighted average price of the Common Shares on the TSX Venture Exchange prior to signing, for gross proceeds of approximately US$30 million. Negotiations toward a definitive agreement for a potential prepayment facility of up to US$120 million remain ongoing.