Osisko Gold Announces Management Update

Osisko Gold Group Inc. (NYSE: OGG, TSXV: OGG) (“Osisko Gold” or the “Company”) announces that, further to its August 25, 2026, announcement regarding the Company’s planned leadership succession transition, Elijah Tyshynski has assumed the role of Chief Financial Officer of the Company effective October 1, 2026, succeeding Alexander Dann. asserted

Osisko Gold Group Inc. is a continental North American gold development company focused on past producing mining camps with district-scale potential. asserted

The Company’s objective is to become an intermediate gold producer through the development of its flagship, fully permitted, 100%-owned Cariboo Gold Project, located within the Company’s broader Cariboo regional land package in central British Columbia, Canada, which hosts numerous prospective exploration targets and provides opportunities for future discoveries. asserted

Its Cariboo project pipeline is complemented by the Tintic Project, located in the historic East Tintic mining district in Utah, U.S.A., a brownfield property with significant exploration potential, extensive historical mining data, and access to established infrastructure. asserted

Osisko Gold is focused on developing long-life mining assets in mining-friendly jurisdictions while maintaining a disciplined approach to capital allocation, development risk management, and mineral inventory growth. asserted

This news release contains “forward-looking information” (within the meaning of applicable Canadian securities laws) and “forward-looking statements” (within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, as amended) (collectively, “forward-looking statements”). asserted

Such forward-looking statements relate to, among other things: the Company’s objective of becoming an intermediate gold producer; and the exploration potential and prospectivity of its properties. asserted

Forward-looking statements are identified with words such as “may”, “will”, “would”, “could”, “anticipate”, “believe”, “expect”, “plan”, “intend”, “potential”, “estimate”, “propose”, “project”, “outlook”, “foresee”, “objective”, “strategy”, variants of these words or the negative or comparable terminology, as well as terms usually used in the future and the conditional. uncertain

Information contained in forward-looking statements is based upon certain material assumptions that were applied in drawing a conclusion or making a forecast or projection, including: the ability to advance the Cariboo Gold Project through construction on the anticipated timeline and within the estimated budget and its status as being fully permitted; the Company’s objective of becoming an intermediate gold producer; and the exploration potential and potential for future discoveries (if any) of its properties. asserted

Such forward-looking statements are based on a number of risks, uncertainties and assumptions which may cause actual results or other expectations to differ materially from those anticipated and which may prove to be incorrect. uncertain

These assumptions include, but are not limited to: the absence of any work stoppages or suspensions at the Company’s projects; favourable regulatory conditions and approvals; the ability to maintain adequate personnel and contractor levels; the absence of unforeseen ground conditions or other geological challenges; the availability of necessary equipment, supplies and infrastructure; and general economic and market conditions. asserted

Actual results could differ materially due to a number of factors, including, without limitation: adverse changes in the Company’s business, financial position, operating environment or access to capital; risks related to the exploration, development and operation of the Cariboo Gold Project; changes in estimated project costs, development timeline, or construction schedule; health, safety and security incidents; regulatory delays or changes in regulatory framework and applicable laws; labour shortages or disputes; general economic and market conditions and business conditions in the mining industry; fluctuations in commodity and currency exchange rates; as well as those risks and factors disclosed in the Company’s most recent annual information form, financial statements and management’s discussion and analysis as well as other public filings on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov). uncertain

Although the Company believes the expectations conveyed by the forward-looking statements are reasonable based on information available as of the date hereof, no assurances can be given as to future results, levels of activity and achievements. asserted

The Company disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or results or otherwise, except as required by law. asserted

Forward-looking statements are not guarantees of performance and there can be no assurance that these forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. uncertain

Accordingly, readers should not place undue reliance on forward-looking statements. asserted

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. asserted

No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained herein. asserted