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

(Toronto, September 21, 2026) – Osisko Critical Minerals Corporation (“OCMC” or the “Corporation“), a newly incorporated entity and a wholly-owned subsidiary of Osisko Metals Incorporated (“Osisko Metals“) (TSX: OM; OTCQX: OMZNF; FRANKFURT: 0B51), is pleased to announce an upsize of its previously announced “best efforts” private placement (the “Private Placement“) of special warrants of the…