Sienna Resources Inc. — Share Issue/Capital Change 2026

Apr 10, 2026

51-102F3
MATERIAL CHANGE REPORT

Item 1 Name and Address of Company
Sienna Resources Inc. (the “Company”)
Suite 2905 – 700 West Georgia Street
Vancouver, B.C. V7Y 1C6

Item 2 Date of Material Change
March 23, 2026

Item 3 News Release
The news release was disseminated through News File and Stockwatch.

Item 4 Summary of Material Change
On March 23, 2026, the Company announced it granted a total of 1.475 million stock options to its directors and consultants at an exercise price of twelve cents per share for a period of 12 months. The Company also granted a total of 3.05 million restricted share units (RSUs) to its directors, officers and consultants.

Item 5 Full Description of Material Change
5.1 Full Description of Material Change
See attached news release.

5.2 Disclosure for Restructuring Transactions
N/A

Item 6 Reliance on subsection 7.1(2) or (3) of National Instrument 51-102
N/A

Item 7 Omitted Information
None

Item 8 Executive Officer
Jason Gigliotti, President, Corporate Secretary, Tel: 604-646-6900

Item 9 Date of Report
April 10, 2026

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Sienna Resources Inc.
2905 - 700 West Georgia Street
Vancouver, BC, V7Y 1K8

Sienna Corporate Update

VANCOUVER, BC, March 25, 2026 – Sienna Resources Inc. (TSX.V: SIEN) (FSE: A418KR), (the “Company” or “Sienna”) wishes to announce that it has granted a total of 1.475 million stock options to its directors and consultants at an exercise price of twelve cents per share for a period of 12 months. The Company also granted a total of 3.05 million restricted share units (RSUs) to its directors, officers and consultants. The RSUs vest in one year from the date of grant. The options and the RSUs have been granted and vest in accordance with the Company's omnibus equity incentive plan and the policies of the TSX Venture Exchange therefore aligning management with the shareholders of the Company.

Contact Information
Tel: 604-646-6900
www.siennaresourcesinc.com

"Jason Gigliotti"
President
Sienna Resources Inc.

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 release.