June 1, 2026

Osisko Development Corp.
Osisko Development Announces Closings of Additional US$75 Million Aggregate Principal Amount of 4.125% Convertible Senior Notes Bringing Total Offering to US$300 Million

Osisko Development Awards Project and Construction Management Services Contract for the Development of the Cariboo Gold Project

Osisko Development Completes US$143.8 Million “Bought Deal” Public Offering of Common Shares Including Full Exercise of Over-Allotment Option

Osisko Development Completes Sale of San Antonio Gold Project

Osisko Development Announces US$125 Million Bought Deal Public Offering of Common Shares to Advance Mineral Resource-to-Reserve Conversion Toward Mine Plan Integration at the Cariboo Gold Project

Osisko Development Reports Contractor Fatality at the Cariboo Gold Project

Osisko Development Provides Infill Drilling Update on Its 13,000-m Program at Cariboo Gold Project; Intercepts Include 8.56 g/t Au Over 8.5m from 60.5m Depth, and 130.32 g/t Au Over 0.5m from 83.5m Depth

Osisko Development Launches Fully-Funded 70,000-Meter Exploration Drilling Campaign Targeting New Discoveries at Cariboo Gold Project
