Lumina Metals Upsizes Its Initial Public Offering of Common Shares

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Not for distribution to U.S. newswire services or dissemination in the United States

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VANCOUVER, British Columbia, April 22, 2026 (GLOBE NEWSWIRE) — Lumina Metals Corp. (“Lumina Metals” or the “Company”) announced today an upsize of its previously announced initial public offering and secondary offering of common shares (“Common Shares”) of the Company (the “Offering”). The Offering will now include a treasury offering by the Company expected to be for total gross proceeds of approximately $312,470,000 and a secondary offering of Common Shares held by a selling securityholder of the Company expected to be for total gross proceeds of approximately $93,742,500, each at a price of $12.50 per share, for total gross proceeds of up to $406,212,500.

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The Company has also granted to the Underwriters (as defined below) an over-allotment option to purchase up to an additional 4,874,550 Common Shares from treasury at a price of $12.50 per Common Share for additional gross proceeds of $60,931,875, if the over-allotment option is exercised in full. The over-allotment option is exercisable, in whole or in part, at any time for a period of 30 days from the closing date of the Offering. If the over-allotment option is exercised in full, the gross proceeds of the Offering will be up to $467,144,375.

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The Offering will be managed by a syndicate of underwriters, including BMO Capital Markets, National Bank Financial Inc., Morgan Stanley Canada Limited, RBC Capital Markets and CIBC World Markets Inc., as co-lead underwriters and joint bookrunners, and Trigon Dom Maklerski S.A., Canaccord Genuity Corp., Haywood Securities Inc., SCP Resource Finance LP and Stifel Canada (collectively, the “Underwriters”).

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The Company intends to file marketing materials containing the specified pricing information regarding the upsized Offering contained in the press release under the Company’s profile on SEDAR+ at www.sedarplus.com. The Underwriters are relying on Coordinated Blanket Order 41-930 Exemptions from Certain Prospectus and Disclosure Requirements to provide marketing materials containing the specified pricing information regarding the upsized Offering to potential investors without further amendment to the Company’s amended and restated preliminary prospectus dated April 15, 2026 (the “A&R Preliminary Prospectus”).

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The A&R Preliminary Prospectus has been filed with the securities regulatory authorities in each of the provinces and territories of Canada and contains important information relating to the Common Shares and the Offering. The A&R Preliminary Prospectus remains subject to completion or further amendment. Copies of the A&R Preliminary Prospectus may be obtained from www.sedarplus.ca.

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No securities regulatory authority has either approved or disapproved the contents of this press release. This press release does not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale or any acceptance of an offer to buy the Common Shares until a receipt for the final prospectus has been issued by the relevant securities regulatory authorities in Canada.

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The Common Shares have not been, and will not be, registered under the United States Securities Act of 1933, as amended (the “U.S. Securities Act“), or any U.S. state securities laws, and may not be offered or sold in the United States without registration under the U.S. Securities Act and all applicable state securities laws or compliance with requirements of an applicable exemption therefrom. This press release shall not constitute an offer to sell or the solicitation of an offer to buy Common Shares in the United States, nor shall there be any sale of these Common Shares in any jurisdiction in which such offer, solicitation or sale would be unlawful.