Osisko Development Announces Supplemental Listing of Warrants

ODV NYSE TSXV News Release

www.osiskodev.com Page 1 of 2

OSISKO DEVELOPMENT ANNOUNCES SUPPLEMENTAL LISTING OF WARRANTS

Montreal, Québec, April 14, 202 5 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV)

("Osisko Development" or the "Company") is pleased to announce that its common share purchase

warrants (the "Warrants") issued pursuant to private placements completed by the Company between

October and November of 2024 will be listed for trading on the TSX Venture Exchange (the " TSXV")

under the symbol "ODV.WT.V". The Warrants are expected to be listed for trading on the TSXV effective

as of the opening of markets on April 17, 2025.

An aggregate of 51,109,776 Warrants will be listed on the TSXV, which were issued pursuant to (i) a

non-brokered private placement of units of the Company that closed in two tranches on October 1,

2024, and October 11, 2024, and (ii) a brokered private placement of units of the Company that closed

on November 12, 2024. The Warrants are governed by the terms of a warrant indenture dated October

1, 2024, as amended and supplemented on October 11, 2024, and further amended and supplemented

on November 12, 2024 , between the Company and TSX Trust Company, as warrant agent (the

"Warrant Indenture").

Each Warrant entitles the holder thereof to purchase one common share of the Company (each, a

"Common Share") at an exercise price of US$3.00 per Common Share on or prior to October 1, 2029.

The Warrants will be trading on the TSXV in U.S. dollars.

A copy of the Warrant Indenture is available on SEDAR+ ( www.sedarplus.ca) under Osisko

Development's issuer profile.

The Company also anticipates listing the Warrants on the New York Stock Exchange (the " NYSE") in

due course, subject to satisfying certain regulatory conditions and requirements in connection thereof.

This news release does not constitute an offer to sell or a solicitation of an offer to buy any securities of

the Company.

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 advan cing its flagship fully 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 infrastructure and skilled labour. The Company's strategy is to

develop attractive, long-life, socially and environmentally re sponsible 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

CAUTION REGARDING FORWARD LOOKING STATEMENTS

All statements, other than statements of historical fact, contained in this news release including, but not limited to, those which are

discussed under the "About Osisko Development Corp." paragraph which essentially describes the Corporation's outlook and

objectives as well as statements relating to the expectation to list the Warrants on the TSXV and/or the NYSE (and the timing

thereof) constitute "forward-looking information" or "forward-looking statements" within the meaning of certain securities laws, and

are based on expectations, estimates and projections as of the time of this press release. Forward-looking statements are necessarily

based upon a number of estimates and assumptions that, while considered reasonable by the Corporation as of the time o f such

statements, are inherently subject to significant business, economic and competitive uncertainties and contingencies. These

estimates and assumptions may prove to be incorrect. Moreover, these forward -looking statements were based upon various

underlying factors and assumptions, including the current conditions and expected future developments, results of operation

outcomes of the Corporation's mineral projects, timing to advance mineral projects, the Corporation's business prospects and

opportunities and estimates of the operational and financial performance, the ability and timing to obtain additional financing, if

needed, and are not guarantees of future performance.

Forward-looking information and statements are subject to known or unknown risks and uncertainties that may cause actual results,

performance and achievements of the Corporation, its projects or industry result to differ materially from those anticipated or implied

in the forward-looking information and statements. These statements reflect the Corporation's current expectations regarding future

events, performance and results and speak only as of the date of this release. Risk factors that could cause actual results or events

to differ materially from current expectations include, among others the ability and timing of the listing of the Warrants on the TSXV

and the NYSE, successful implementation its strategic initiatives and whether such strategic initiatives will yield the expec ted

benefits, the availability of financing or financing on favourable terms for the Corporation, the impact of inflation on costs, the risks

of obtaining the necessary permits, the operating performance of the Corporation's assets and businesses, competitive factors in

the gold mining and production industry, changes in laws and regulations affecting the Corporation's businesses, political and social

acceptability risk, environmental regulation risk, currency and exchange rate risk, technological developments, the impacts of any

health crises and pandemics and the governments' responses thereto, and general economic conditions, as well as earnings, capital

expenditure, cash flow and capital structure risks and general business risks. For a more detailed discussion of such risks and other

factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements, refer

to the Corporation's filings with Canadian and United States secu rities regulators, including the Corporation's most recent annual

information form, available on SEDAR+ at www.sedarplus.ca and on the SEC's website at www.sec.gov.

The Corporation disclaims any intention or obligation to update or revise any forward-looking statements or to explain any material

difference between subsequent actual events and such forward-looking statements, except to the extent required by applicable law.

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.