Mr. Sean Roosen reports

OSISKO GOLD ANNOUNCES CFO TRANSITION TO SUPPORT ITS NEXT STAGE OF GROWTH

Alexander Dann has advised Osisko Gold Group Inc. of his intention to retire and will step down from his role as chief financial officer and vice-president, finance, capping a distinguished 35-year career. Mr. Dann will remain with the company for a transition period to support an orderly handover of responsibilities. As part of the company's planned leadership succession process, Elijah Tyshynski will be appointed CFO and will join the senior leadership team following a period of transition, bringing extensive financial and capital market experience as the company enters its next stage of growth.

Sean Roosen, chairman and chief executive officer, commented: "We thank Alex for his significant contributions and leadership over the past five years. He was instrumental in guiding the company through an important period and ensuring it enters its next phase of growth from a position of financial strength. On behalf of the board of directors and our entire team, I extend our sincere appreciation to Alex for his exemplary service and wish him all the best in his well-earned retirement. Elijah joins the company at a pivotal time and inherits a robust balance sheet. We believe his experience and capabilities will help maintain the financial discipline required to execute our growth strategy and deliver long-term value for all shareholders."

Reflecting on his tenure, Mr. Dann commented: "Serving as CFO of Osisko Gold has been a privilege, and I am grateful to have worked alongside such a talented team. The company is well positioned for continued success, and I am confident the team will carry that momentum forward."

Elijah Tyshynski biography

Mr. Tyshynski joins Osisko Gold from Atex Resources Inc., where he served as chief financial officer and corporate secretary from 2025 following the sale of O3 Mining to Agnico Eagle Mines. During his time with O3 Mining, he acted as chief financial officer and corporate secretary, and oversaw financial and regulatory reporting, financings, implementation of internal policies and processes, and the eventual transaction with Agnico. Prior to, and during his time with, O3 Mining, Mr. Tyshynski worked with Osisko Mining as the director of strategic development, along with providing capital market and strategic advice to other companies within the Osisko Group. Mr. Tyshynski background includes extensive infrastructure financing and structuring experience across developed and emerging markets, including at the sovereign and supranational levels, having held the position of senior portfolio manager at Ontario Teachers Pension Plan, head of trading for Standard Bank of South Africa in Johannesburg, and vice-president of emerging market trading for both Morgan Stanley and Royal Bank of Canada in London, England.

About Osisko Gold Group Inc.

Osisko Gold is a continental North American gold development company focused on past-producing mining camps with district-scale potential. The company's objective is to become an intermediate gold producer through the development of its flagship, fully permitted, 100-per-cent-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. Its Cariboo project pipeline is complemented by the Tintic project, located in the historic East Tintic mining district in Utah, United States, a brownfield property with significant exploration potential, extensive historical mining data and access to established infrastructure. 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.

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