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Osisko Development Announces Results of Annual Meeting of Shareholders

Shareholder Meetings

NYSE: ODV TSXV: ODV NEWS RELEASE

Page 1 of 2

OSISKO DEVELOPMENT ANNOUNCES RESULTS OF ANNUAL MEETING OF

SHAREHOLDERS

Montreal, Québec, 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:

Resolution #1

Name of Nominee Votes For % Votes For Votes

Against

% Votes

Against

Sean Roosen 49,239,974 99.78% 109,433 0.22%

Charles E. Page 49,223,227 99.74% 126,180 0.26%

Marina Katusa 49,245,554 99.79% 103,853 0.21%

Michèle McCarthy 49,163,476 99.62% 185,931 0.38%

Duncan Middlemiss 49,256,451 99.81% 92,956 0.19%

Éric Tremblay 49,249,725 99.80% 99,682 0.20%

David Danziger 49,255,980 99.81% 93,427 0.19%

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:

Resolution #2

Name of Auditor Votes For % Votes For Votes

Withheld

% Votes

Withheld

PricewaterhouseCoopers LLP 53,020,643 99.93% 36,487 0.07%

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:

Resolution #3 Votes For % Votes For Votes

Against

% Votes

Against

Stock Option Plan 47,691,581 96.64% 1,657,826 3.36%

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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 brownfiel d 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.

For further information, please contact Osisko Development Corp.:

Sean Roosen Philip Rabenok

Chairman and CEO Director, Investor Relations

Email: [email protected] Email: [email protected]

Tel: +1 (514) 940-0685 Tel: +1 (437) 423-3644

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 ade quacy or accuracy of this release. No stock exchange, securities

commission or other regulatory authority has approved or disapproved the information contained herein.