Osisko Metals Incorporated — Proxy Solicitation & Information Statement 2026

Apr 21, 2026

OSISKO METALS

TMX

TSX TRUST

Notice of Availability of Proxy Materials for Osisko Metals Incorporated Annual Meeting of Shareholders

The Board of Directors of Osisko Metals Incorporated recommends that Shareholders vote FOR ALL resolutions. Your vote is important. Vote today.

Meeting Date and Location:

When: Thursday, May 28, 2026 at 10:00 a.m. (Toronto time)

Where: Bennett Jones LLP, Suite 3400, 100 King Street West, Toronto, Ontario, M5X 1A4, Canada

You are receiving this notification as Osisko Metals Incorporated (the "Corporation") has decided to use the notice and access model for delivery of meeting materials to its shareholders and to advise that the proxy materials for the above noted shareholders' meeting are available on the Internet. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We remind you to access and review all of the important information contained in the Management Information Circular and other proxy-related materials before voting.

The Management Information Circular and other relevant materials are available at:

https://docs.tsxtrust.com/OM

OR

www.sedarplus.ca

How to obtain paper copies of the proxy materials

Shareholders may request to receive paper copies of the current meeting materials by mail at no cost. To ensure you receive the materials in advance of the voting deadline and meeting date, all requests must be received no later than on May 14, 2026. If you do request the current materials, please note that another Form of Proxy or Voting Instruction Form will not be sent; please retain your current one for voting purposes.

To obtain information about notice and access or to request paper copies of the proxy-related materials, please call TSX Trust Company, toll-free within North America at 1-888-433-6443, or email your request to tsxt-fulfilment@tmx.com.

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OSISKO METALS

TMX

TSX TRUST

Securityholder Meeting Notice

The resolutions to be voted on at the meeting are listed below along with the Sections within the Management Information Circular where disclosure regarding the matter can be found.

1. Election of Directors – Page 6
2. Appointment of Auditors – Page 5

Voting

PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your securities you must vote using the methods reflected on your enclosed Form of Proxy or Voting Instruction Form. Your Form of Proxy or Voting Instruction Form must be received by 10:00 a.m. (Toronto time) on May 26, 2026.

PLEASE VIEW THE MANAGEMENT INFORMATION CIRCULAR PRIOR TO VOTING

Annual Financial Statements delivery

• Only to Registered and Beneficial Shareholders who opted to receive one.

Questions?

If you have questions or require voting assistance, you may contact our proxy solicitation agent below.

Laurel Hill Advisory Group
Canada/US Toll Free: 1-877-452-7184
International: 1-416-304-0211
Text Message: Text "INFO" to 416-304-0211 or 1-877-452-7184
Email: assistance@laurelhill.com