(All dollar amounts are expressed in Canadian dollars, unless stated otherwise) HIGHLIGHTS Q1 2026 (at March 31, 2026) Financial: ~$594.3 million in cash and cash equivalents; sold 270 ounces of gold from small-scale mining activities at the Tintic Project; received ~$36.5 million in proceeds from warrant exercises Financing: Completed a prospectus offering of common shares for ~US$143.8 million in gross proceeds Cariboo Gold Project: Resumed planned site activities under a phased reopening plan following a temporary suspension due to a fatal incident that occurred on January 22, 2026; entered into a project and construction management services agreement with JDS Energy & Mining; released new infill drill results from the Lowhee Zone (100% of planned drilling now complete, while final assays and reconciliation results remain pending); 11 drill rigs operating at site across various infill and exploration programs Corporate: Completed the sale of the San Antonio Gold Project; appointed Sarah Harrison as VP, Permitting & Compliance; announced the Company's inclusion in the VanEck Junior Gold Miners ETF (GDXJ) Subsequent to Q1 2026 Corporate: Granted incentive awards; appointed Sarah MacDonald as VP, Construction Contracting and Commercial MONTREAL, May 11, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three months ended March 31, 2026 ("Q1 2026"). Q1 2026 HIGHLIGHTS Operating, Financial and Corporate Updates: As of March 31, 2026, the Company had approximately $594.3 million in cash and cash equivalents.