Osisko Metals 2025 Annual and Special General Meeting of Shareholders

The Company’s Annual and Special General Meeting of Shareholders will be held on Thursday, May 29, 2025 at 10:00 a.m. (Toronto time) at the offices of Bennett Jones LLP, Suite 3400, 100 King Street West, Toronto, Ontario, M5X 1A4.

Management Information Circular

Notice of Meeting

Proxy

Effective governance is at the foundation of our performance and success as a publicly traded mining company.

Our obligations, expectations, and intentions toward our many stakeholders are reinforced regularly at all levels of the Company and summarized in the following documents:

Board Mandate

Lead Director Mandate

Code of Ethics

Anti Bribery and Anti Corruption Policy

Diversity Policy

ESG Policy

Whistleblower Policy

Workplace Harassment and Workplace Violence Policy

Annual Information Form (for the year ended December 31, 2024)

The Company’s Corporate Governance practices comply with the national instruments of the Canadian Securities Administrators regarding corporate governance practices, including National Instrument 58-101 Disclosure of Corporate Governance Practices.

The Board of Directors is responsible for ensuring compliance with these policies. It has four committees: audit, compensation, corporate governance and nominating, and investment.

Audit Committee

Members: Amy Satov (Chair), Donald Siemens, Cathy Singer

Compensation Committee

Members: Amy Satov (Chair), Donald Siemens, Cathy Singer

Corporate Governance and Nominating Committee

Members: Cathy Singer (Chair), Jeff Hussey, Amy Satov

Investment Committee

Members: Patrick Anderson (Chair), Tara Christie, Amy Satov, Peter Wright

Responsible Business Committee

Members: Patrick Anderson (Chair), Tara Christie, Cathy Singer