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Osisko Development Announces Results of Annual and Special Meeting of Shareholders and Grant of Deferred Share Units

Share Capital & Compensation Shareholder Meetings

ODV NYSE TSXV News Release

www.osiskodev.com Page 1 of 3

OSISKO DEVELOPMENT ANNOUNCES RESULTS OF ANNUAL AND SPECIAL MEETING

OF SHAREHOLDERS AND GRANT OF DEFERRED SHARE UNITS

Montreal, Québec, June 24, 2026 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV)

("Osisko Development" or the "Company") announces below the results of its annual and special

meeting of shareholders of the Company (the " Meeting") held on June 23, 2026. Further information

regarding the business of the Meeting is contained in the Company's management information circular

dated May 11, 2026 (the "Circular"), which is available on SEDAR+ (www.sedarplus.ca) under the

Company's issuer profile.

A total of 226,058,370 common shares were voted at the Meeting, representing approximately 74.19%

of the total issued and outstanding common shares of the Company as of the record date of the Meeting.

1. Election of Directors

Each of the directors listed as nominees in the Circular, 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 202,062,275 98.91% 2,234,846 1.09%

Charles E. Page 172,497,611 84.44% 31,799,510 15.56%

Michèle McCarthy 171,284,316 83.84% 33,012,804 16.16%

David Danziger 169,832,493 83.13% 34,464,628 16.87%

Stephen Quin 203,529,000 99.62% 768,121 0.38%

Susan Craig 203,517,931 99.62% 779,189 0.38%

Keith McKay 203,583,947 99.65% 713,174 0.35%

2. Appointment 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 225,812,331 99.90% 219,606 0.10%

3. Registered Office Resolution

The special resolution to approve the amendment to the Articles of the Company to change the province

of the Company's registered office from the Province of Québec to the Province of Ontario , as outlined

in the Circular, was passed, with the following results:

Resolution #3 Votes For % Votes For Votes

Against

% Votes

Against

Registered Office Resolution 204,029,595 99.88% 241,093 0.12%

www.osiskodev.com Page 2 of 3

4. Name Change Resolution

The special resolution to approve the change of name of the Company to "Osisko Gold Group Inc.", as

outlined in the Circular, was passed, with the following results:

Resolution #4 Votes For % Votes For Votes

Against

% Votes

Against

Name Change Resolution 224,810,764 99.46% 1,221,172 0.54%

In connection with the Company's name change to "Osisko Gold Group Inc.", the Company anticipates

updating its stock ticker symbol for its listed securities on each of the TSX Venture Exchange and the

New York Stock Exchange to "OGG".

Grant of Deferred Share Units

As part of the annual compensation review of its Board of Directors , the Company granted 247,129

deferred share units of the Company ("DSUs") to its independent directors. The DSUs were granted in

accordance with the Company's omnibus equity i ncentive plan, which is available on the Osisko

Development website at www.osiskodev.com.

ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. 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% -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, U.S.A., a brownfield

property with s ignificant 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.

For further information, 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

CAUTION REGARDING FORWARD-LOOKING STATEMENTS

This news release contains "forward-looking information" (within the meaning of applicable Canadian securities laws) and "forward-

looking statements" (within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, as amended) (collective ly,

"forward-looking statements"). Such forward -looking statements are identified with words such as "may", "will", "would", "could",

"anticipate", "believe", "expect", "plan", "intend", "potential", "estimate", "propose", "project", "outlook", "foresee" , "objective",

"strategy", variants of these words or the negative or comparable terminology, as well as terms usually used in the future and the

conditional. Information contained in forward -looking statements is based upon certain material assumptions that were applied in

drawing a conclusion or making a forecast or projection, including the assumptions, qualifications, limitations or statements

pertaining to: the Company's anticipated name change and updated stock ticker symbol; the Company's objective of becoming an

intermediate gold producer (if at all); the ability to develop the Cariboo Gold Project and its status as being fully permitted; and the

exploration potential and prospectivity (if any) of its properties . Such forward-looking statements are based on a number of risks,

uncertainties and assumptions which may cause actual results or other expectations to differ materially from those anticipate d and

which may prove to be incorrect. These assumptions include, but are not limited to: the absence of any work stoppages or

suspensions at the Company's projects; favourable regulatory conditions and approvals; the ability to maintain adequate personnel

and contractor levels; the absence of unforeseen ground conditions or other geological challenges; the availability of necess ary

equipment, supplies and infrastructure; and general economic and market conditions. Actual results could differ materially due to a

number of factors, including, without limitation: risks related to the exploration, development and operation of the Cariboo Gold

Project; health, safety and security incidents; regulatory delays or changes in regulatory framework and applicable laws; labour

shortages or disputes; general eco nomic and market conditions and business conditions in the mining industry; fluctuations in

commodity and currency exchange rates; changes in regulatory framework and applicable laws, as well as those risks and factors

disclosed in the Company's most recent annual information form, financial statements and management's discussion and analysis

as well as other public filings on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov). Although the Company believes the

expectations conveyed by the forward -looking statements are reasonable based on information available as of the date hereof, no

assurances can be given as to future results, levels of activity and achievements. The Company disclaims any obligation to update

any forward-looking statements, whether as a result of new information, future events or results or otherwise, except as required

by law. Forward-looking statements are not guarantees of performance and there can be no assurance that these forward -looking

statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in s uch

www.osiskodev.com Page 3 of 3

statements. Accordingly, readers should not place undue reliance on forward -looking statements.

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.