Osisko Development Announces Results of Annual Meeting of Shareholders

MONTREAL, May 11, 2023 - Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the results of its annual meeting of shareholders (the "Meeting") held on May 11, 2023. A total of 53,200,216 common shares were voted at the Meeting, representing approximately 63.7% 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 are as follows:

1. Election of Directors

Each of the directors listed as nominees in Osisko Development's Management Information Circular (the "MIC") dated March 31, 2023, was elected to the board of directors of the Company to serve for the ensuing year or until their successors are duly elected or appointed, with the following results:

2. Appointment and Remuneration of Auditor

PricewaterhouseCoopers LLP was re-appointed as the Company's independent auditor and the directors were authorized to fix the auditor's remuneration for the ensuing year, with the following results:

3. Approval of the amended and restated Stock Option Plan

The ordinary resolution to approve the adoption of the Company's amended and restated Stock Option Plan as outlined in the MIC dated March 31, 2023, was passed, with the following results:

About Osisko Development Corp.

Osisko Development Corp. is a premier North American gold development company focused on high-quality past-producing properties located in mining friendly jurisdictions with district scale potential. The Company's objective is to become an intermediate gold producer by advancing its 100%-owned Cariboo Gold Project, located in central B.C., Canada, the Tintic Project in the historic East Tintic mining district in Utah, U.S.A., and the San Antonio Gold Project in Sonora, Mexico. In addition to considerable brownfield exploration potential of these properties, that 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, socially and environmentally sustainable mining assets, while minimizing exposure to development risk and growing mineral resources.

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Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release. No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained herein.