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(All dollar amounts are expressed in Canadian dollars, unless stated otherwise) HIGHLIGHTS Q4 2025 (at December 31, 2025) Financial: ~$422.3 million in cash and cash equivalents; sold 3,970 ounces of gold from small-scale mining activities at the Tintic Project Financing: Completed a private placement financing for ~$82.5 million in gross proceeds Cariboo Gold Project: Released new infill drill results from the ongoing program in the Lowhee Zone and commenced a multi-faceted surface exploration program targeting new discoveries; pre-construction activities continued to advance, including the water treatment plant, underground development waste rock storage facility, sediment control pond, site camp upgrade and other critical infrastructure Corporate: Announced sale of the San Antonio Gold Project; Appointed Scott Smith as VP, Exploration Subsequent to Q4 2025 Financial: Received ~$24.9 million in proceeds from a warrants exercise Financing: Completed prospectus offering of common shares for ~US$143.8 million in gross proceeds Cariboo Gold Project: Resumed planned site activities in accordance with 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 ongoing Lowhee Zone (aggregate total 11,025 metres, or ~80% of planned program) Corporate: Completed 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) MONTREAL, March 27, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") reports its financial and operating results for the three and twelve months ended December 31, 2025 ("Q4 2025" and "2025", respectively). Q4 2025 HIGHLIGHTS Operating, Financial and Corporate Updates: As of December 31, 2025, the Company had approximately $422.3 million in cash and cash equivalents.

MONTREAL, March 16, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce its inclusion in the VanEck Junior Gold Miners ETF ("GDXJ") pursuant to the GDXJ's semi-annual review and rebalancing announced on March 13, 2026, effective at the close of markets on March 20, 2026. "We are very pleased to be included in the widely followed GDXJ index, which we believe will further elevate our market visibility and trading liquidity profile while broadening access to investors seeking exposure to the gold sector," stated Sean Roosen, Chairman and CEO.

MONTREAL, March 09, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces that it has received approximately C$24.9 million from the exercise of 5,625,031 common share purchase warrants of the Company (the "Warrants") held by funds advised by Appian Capital Advisory Limited ("Appian"). The Warrants were originally issued to Appian with an exercise price of C$4.43 per common share on July 21, 2025, in connection with the senior secured project loan credit facility totaling US$450 million for the development and construction of the Company's fully permitted, 100%-owned Cariboo Gold Project located in central British Columbia, Canada.

Equinox Partners sold 1,032,596 shares of Osisko Development in the fourth quarter. The quarter-end position value fell by $3.55 million as a result.

MONTREAL, March 02, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the resumption of planned site activities at its Cariboo Gold Project (the "Project") in British Columbia, following a temporary suspension related to an isolated tragic incident that occurred at surface on January 22, 2026. A phased gradual reopening plan of surface and underground activities was successfully implemented over the last several weeks, while ensuring the health and safety of all employees and contractors, in coordination with and approval from the relevant regulatory authorities.

HIGHLIGHTS 11,025 m of infill drilling completed (5,043 m new results) on 10-m drill spacing in 116 drill holes from August 2025 representing ~80% of the total planned ~13 km infill program Highlight intercepts include: 596.40 g/t Au over 2.0 m from 6.1 m downhole (including 2,293.56 g/t Au over 0.5 m from 6.6 m downhole), 21.67 g/t Au over 3.5 m from 96.5 m downhole (including 135.44 g/t Au over 0.5 m from 99.5 m downhole), and 21.97 g/t Au over 2.5 m from 48.7 m downhole Results to date continue to contribute to a more detailed understanding of spatial controls and local variability of the Lowhee Zone An aggregate total of ~12.1 km (~88%) of total planned drill meters have been completed to date, with full assays and QA/QC pending for the remaining, unreported holes Infill program anticipated to conclude in early Q2 2026 MONTREAL, Feb. 11, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce new infill drilling results from its ongoing 13,000-meter program on 10 meter drill spacing that commenced in August 2025 in the Lowhee Zone of the Company's permitted, 100%-owned Cariboo Gold Project ("Cariboo" or the "Project"), located in central British Columbia ("B.C."), Canada.

MONTREAL, Feb. 09, 2026 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce that its wholly-owned subsidiary, Barkerville Gold Mines Ltd., has entered into a definitive Project and Construction Management Services Agreement with JDS Energy & Mining Inc. ("JDS") for the development of the Cariboo Gold Project, located in British Columbia (the "Cariboo Gold Project").