Sienna Resources Inc. Corporate Update

Vancouver, British Columbia--(Newsfile Corp. - April 29, 2025) - Sienna Resources Inc. (TSXV: SIE), (the "Company" or "Sienna") announces that it intends to complete a consolidation of its issued and outstanding common shares (the "Shares") on the basis of one new Share (a "Post-consolidated Share") for every ten currently outstanding Shares (the "Consolidation").

It is anticipated that the Consolidation will reduce the number of outstanding Shares from 202,668,871 Shares to approximately 20,266,887 Post-consolidated Shares, subject to adjustment for rounding. The Board of Directors of the Company believes that the consolidation of the Shares will both enhance the marketability of the Company as an investment and better position the Company to raise the funds necessary to execute the Company's business plan. The Consolidation is subject to approval by the TSX Venture Exchange (the "Exchange").

The Company does not intend to change its name or its current trading symbol in connection with the proposed Consolidation. The effective date of the Consolidation will be announced in a subsequent news release.

No fractional Post-consolidated Shares will be issued as a result of the Consolidation. As required under the Business Corporations Act (BC), any fractional Shares remaining after the Consolidation that are less than one half of a Share will be cancelled and any fractional Shares that are at least one half of a Share will be rounded up to one whole Share.

The exercise price and number of Shares of the Company, issuable upon the exercise of outstanding options and warrants and conversion of outstanding convertible debentures, will be proportionally adjusted upon the implementation of the proposed Consolidation in accordance with the terms thereof.

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.

Forward Looking Statements

This news release contains forward-looking information which is subject to a variety of risks and uncertainties and other factors that could cause actual events or results to differ from those projected in the forward-looking statements. Forward looking statements in this press release include that the Company intends to consolidate its share capital. These forward-looking statements are subject to a variety of risks and uncertainties and other factors that could cause actual events or results to differ materially from those projected in the forward-looking information. Risks that could change or prevent these statements from coming to fruition include that the Company may not obtain approval for the Consolidation from the Exchange. The forward-looking information contained herein is given as of the date hereof and the Company assumes no responsibility to update or revise such information to reflect new events or circumstances, except as required by law.

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