Mr. Sean Roosen reports

OSISKO DEVELOPMENT ANNOUNCES RESULTS OF ANNUAL MEETING OF SHAREHOLDERS

Osisko Development Corp. has released the results of its annual meeting of shareholders held on May 7, 2024. A total of 55,749,501 common shares were voted at the meeting, representing approximately 66.27 per cent of the total issued and outstanding common shares of the company as of the record date of the meeting. A summary of the results for the items voted at the meeting is provided in this news release.

Election of directors

Each of the directors listed as nominees in Osisko Development's management information circular (MIC) dated March 18, 2024, was elected to the board of directors of the company to serve for the ensuing year or until his or her successor is duly elected or appointed, as shown in an attached table.

Appointment of auditor

PricewaterhouseCoopers LLP was reappointed as the company's independent auditor and the directors were authorized to fix the auditor's remuneration for the ensuing year, as shown in an attached table.

Approval of the amended stock option plan

The ordinary resolution to approve the adoption of the company's amended stock option plan as outlined in the MIC dated March 18, 2024, was passed, as shown in an attached table.

Approval of the amended deferred share unit plan

The ordinary resolution to approve the adoption of the company's amended deferred share unit plan as outlined in the MIC dated March 18, 2024, was passed, as shown in an attached table.

About Osisko Development Corp.

Osisko Development is a 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 100-per-cent-owned Cariboo gold project, located in central British Columbia, Canada, the Tintic project in the historic East Tintic mining district in Utah, U.S., and the San Antonio gold project in Sonora, Mexico. In addition to considerable brownfield exploration potential of these properties, which benefit from significant historical mining data, existing infrastructure and access to skilled labour, the company's project pipeline is complemented by other prospective exploration properties. The company's strategy is to develop attractive, long-life, and socially and environmentally sustainable mining assets, while minimizing exposure to development risk and growing mineral resources.