Mr. Scott Parsons reports

ALAMOS GOLD ANNOUNCES FILING OF BASE SHELF PROSPECTUS

Alamos Gold Inc. has filed a base shelf prospectus dated Aug. 8, 2025, with the Ontario Securities Commission, relying on the seasoned issuer exemption, and a corresponding shelf registration statement with the United States Securities and Exchange Commission (SEC) on Form F-10. The base shelf prospectus qualifies the issuance of up to $500-million (U.S.) (or the equivalent in other currencies) of Class A common shares, debt securities, warrants and subscription receipts of the company, or any combination thereof, in all of the provinces and territories of Canada, and the registration statement registers the securities for offers and sales in the United States using the multijurisdictional disclosure system. The base shelf prospectus is effective for a period of 25 months. The registration statement, once it is declared effective by the SEC, will be effective for the remaining duration of the base shelf prospectus.

The base shelf prospectus replaces the previous base shelf prospectus that was filed in May, 2023, and expired in June, 2025. The company has filed the base shelf prospectus and registration statement to maintain financial flexibility but has no present intentions to undertake an offering of securities under the base shelf prospectus. There is no certainty any securities will be offered or sold under the base shelf prospectus and/or registration statement within the 25-month effective period. Should the company decide to offer securities during the 25-month effective period, the specific terms, including the use of proceeds, will be set forth in a prospectus supplement to the base shelf prospectus and registration statement.

About Alamos Gold Inc.

Alamos is a Canadian-based intermediate gold producer with diversified production from three operations in North America. This includes the Island Gold district and the Young-Davidson mine in Northern Ontario, Canada, and the Mulatos district in Sonora state, Mexico. Additionally, the company has a strong portfolio of growth projects, including the phase 3-plus expansion at Island Gold and the Lynn Lake project in Manitoba, Canada. Alamos employs more than 2,400 people and is committed to the highest standards of sustainable development. The company's shares are traded on the Toronto Stock Exchange and New York Stock Exchange under the symbol AGI.

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