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Osisko Development Announces Annual Grant of Incentive Awards

Share Capital & Compensation

ODV NYSE TSXV News Release

www.osiskodev.com Page 1 of 2

OSISKO DEVELOPMENT ANNOUNCES ANNUAL GRANT OF INCENTIVE AWARDS

Montreal, Québec, May 13, 2025 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko

Development" or the "Company") announces that, as part of the annual compensation review of its

Board of Directors, it has granted an aggregate of (i) 1,273,900 stock options of the Company (the

"Options") to certain senior officers and non -executive employees of the Company , (ii) 1,177,200

restricted share units of the Company ("RSUs") to certain senior officers and non-executive employees

of the Company , and (iii) 229,573 deferred share units of the Company (" DSUs") to its independent

directors (collectively, the " Incentive Awards "), in accordance with the terms of the Company's

omnibus equity incentive plan ("Omnibus Plan").

The Incentive Awards constitute the Company's annual security-based compensation grants, consistent

with its regular annual compensation cycle. The Options are exercisable at a price of C$2.57 per common

share of the Company (based on the closing price of the common shares of the Company on the TSX

Venture Exchange as of the close of markets on May 12, 2025) and will expire on May 13, 2030. Vesting

of the Options will occur in three equal parts on the following dates: May 13, 2026, May 13, 2027 and

May 13, 2028, respectively. The RSUs will cliff vest on May 13, 2028. The DSUs will vest in accordance

with the terms of the Omnibus Plan.

The Omnibus Plan was adopted by the Board of Directors on March 26, 2025 and approved by

shareholders of the Company at the annual and special meeting of shareholders that was held on May

7, 2025. The Omnibus Plan is a fixed 20% plan, providing for a maximum of 27,324,297 common shares

of the Company reserved for issuance pursuant to Options, DSUs, RSUs and performance share units

governed thereunder (less any shares reserved for issuance under other share compensation

arrangements of the Company). The Omnibus Plan has received final acceptance from the TSX Venture

Exchange.

For more details regarding the Omnibus Plan, please refer to the Company's management information

circular dated March 26, 2025 (the " Circular") which is accessible on SEDAR+ ( www.sedarplus.ca)

under the Company's issuer profile. The full text of the Omnibus Plan is appended as Schedule "C" to

the Circular. A copy of the Circular and the Omnibus Plan is also available on the Company's website at

www.osiskodev.com.

ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. 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 flagship permitted 100%-owned

Cariboo Gold Project, located in central B.C., Canada. Its project pipeline is complemented by the Tintic

Project in the historic East Tintic mining district in Utah, U.S.A., and the San Antonio Gold Project in

Sonora, Mexico—brownfield properties with significant exploration potential, extensive historical mining

data, access to existing infrastructu re and skilled labour. The Company's strategy is to develop

attractive, long-life, socially and environmentally responsible mining assets, while minimizing exposure

to development risk and growing mineral resources.

For further information, visit our website at www.osiskodev.com or contact:

Sean Roosen Philip Rabenok

Chairman and CEO Vice President, Investor Relations

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

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

www.osiskodev.com Page 2 of 2

Neither the 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 news release. No stock exchange,

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