Montréal, October 21, 2021 – Osisko Development Corp. (“Osisko Development” or the “Corporation”) (ODV: TSX-V) is pleased to announce that the TSX Venture Exchange (the “Exchange”) has accepted for listing the outstanding 14,789,258 common share purchase warrants of the Corporation (collectively, the “Warrants”). Each Warrant entitles the holder thereof to acquire one common share of the Corporation at a price of CDN $10.00 per share at any time on or prior to December 1, 2023. The Exchange has advised that these Warrants will be listed for trading on the Exchange under the symbol “ODV.WT” effective at market open on October 25, 2021.