Mr. Sean Roosen reports

OSISKO DEVELOPMENT ANNOUNCES ANNUAL GRANT OF INCENTIVE AWARDS

As part of an annual compensation review conducted by the board of directors, Osisko Development Corp. has granted an aggregate of: (i) 1,104,400 stock options of the company; and (ii) 1,426,600 restricted share units of the company to certain senior officers and non-executive employees, pursuant to the company's omnibus equity incentive 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 $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 instalments 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 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-per-cent-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, United States, 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.

We seek Safe Harbor.