Osisko Development increases bought deal to $75-million

Mr. Sean Roosen reports OSISKO DEVELOPMENT ANNOUNCES FURTHER UPSIZE OF PREVIOUSLY ANNOUNCED "BOUGHT DEAL" OFFERING As a result of excess demand, Osisko Development Corp. has entered into a further amending agreement with National Bank Financial Inc., BMO Capital Markets and RBC Capital Markets, acting as co-lead underwriters and co-bookrunners, to increase the size of its previously announced bought deal financing from $60-million to $75-million. As announced by the company on Oct. 9, 2025, Osisko Development has agreed to issue: (i) three tranches of shares under the listed issuer financing exemption available under Part 5A of National Instrument 45-106, Prospectus Exemptions, as amended by Coordinated Blanket Order 45-935, Exemptions from Certain Conditions of the Listed Issuer Financing Exemption, in each of the provinces and territories of Canada, comprising national flow-through shares, British Columbia flow-through shares and common shares of the company for gross proceeds of approximately $50-million; and (ii) additional common shares on a private placement basis pursuant to exemptions available under NI 45-106, other than the LIFE exemption, for gross proceeds of approximately $10-million. Pursuant to the amendment, the company has agreed to increase the size of the concurrent private placement by approximately $15-million, such that, after giving effect to the amendment, the concurrent private placement will consist of an aggregate of 5,230,200 common shares at a price of $4.78 per common share for gross proceeds of $25,000,356. Other than the increase in the size of the concurrent private placement, all other terms of the offering remain unchanged following the amendment. Closing of the LIFE offering and the concurrent private placement are expected to occur on the same date, being on or about Oct. 29, 2025, and remain subject to certain conditions, including, but not limited to, the receipt of all necessary regulatory approvals, including the conditional approval of the TSX Venture Exchange and the New York Stock Exchange. The common shares issued under the concurrent private placement will be subject to a statutory hold period of four months and one day pursuant to applicable Canadian securities laws. About Osisko Development Corp. Osisko Development is a continental North American gold development company focused on past-producing mining camps located in mining-friendly jurisdictions with district-scale potential. The company's objective is to become an intermediate gold producer by advancing its flagship permitted, 100-per-cent-owned Cariboo gold project, located in central British Columbia, Canada. Its project pipeline is complemented by the Tintic project in the historic East Tintic mining district in Utah, United States, and the San Antonio gold project in Sonora, Mexico -- brownfield properties with significant exploration potential, extensive historical mining data, and access to existing infrastructure and skilled labour. The company's strategy is to develop attractive, long-life, and socially and environmentally responsible mining assets while minimizing exposure to development risk and growing mineral resources. We seek Safe Harbor.