Osisko Development Announces Annual Grant of Incentive Awards

MONTREAL, April 01, 2026 -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that, as part of the annual compensation review conducted by its Board of Directors, it has granted an aggregate of (i) 1,104,400 stock options of the Company (the "Options"), and (ii) 1,426,600 restricted share units of the Company ("RSUs") to certain senior officers and non-executive employees (collectively, the "Incentive Awards"), pursuant to the Company's omnibus equity incentive plan ("Omnibus Plan").

The Incentive Awards form part of the Company's security-based compensation grants as part of its annual compensation cycle. The Options are exercisable at a price of C$4.51 per common share of the Company (based on the March 31, 2026, closing price on the TSX Venture Exchange) and will expire on April 1, 2031. The Options will vest in three equal installments over the next three years. The RSUs will cliff vest on April 1, 2029, and are subject to time and performance conditions.

ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. is a continental North American gold development company focused on past producing mining camps with district scale potential. The Company's objective is to become an intermediate gold producer through the development of its flagship, fully permitted, 100%-owned Cariboo Gold Project, located in central British Columbia, Canada. Its project pipeline is complemented by the Tintic Project located in the historic East Tintic mining district in Utah, U.S.A., a brownfield property with significant exploration potential, extensive historical mining data, and access to established infrastructure. Osisko Development is focused on developing long-life mining assets in mining-friendly jurisdictions while maintaining a disciplined approach to capital allocation, development risk management, and mineral inventory growth.