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Prospectus Supplement and Base Shelf Prospectus Accessible
on
SEDAR+

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NOT FOR ‎DISTRIBUTION TO UNITED STATES NEWSWIRE SERVICES OR FOR THE ‎DISSEMINATION, DISTRIBUTION, ‎RELEASE OR PUBLICATION, DIRECTLY OR INDIRECTLY, IN OR INTO THE UNITED STATES.

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TORONTO, Oct. 20, 2025 (GLOBE NEWSWIRE) — Allied Gold Corporation (TSX:AAUC) (NYSE: AAUC) (“Allied” or the “Company”) is pleased to announce that it has filed a prospectus supplement (the “Prospectus Supplement”) dated October 20, 2025, to its short form base shelf prospectus (the “Base Shelf Prospectus”) dated October 1, 2024, with the securities regulatory authorities in each of the provinces of Canada to qualify the public distribution of 6,400,000 common shares of the Company (the “Common Shares”) at an offering price (the “Offering Price”) of $27.35 per Common Share in connection with the Company’s previously announced overnight marketed equity offering (the “Offering”). The full particulars of the Offering along with the possible exercise and issue of shares pursuant to the over-allotment option are set out in the Prospectus Supplement.

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Closing of the Offering is expected to occur on or about October 24, 2025, and is subject to satisfaction of all closing conditions, including the listing requirements of the Toronto Stock Exchange (the “TSX”) and the New York Stock Exchange. The TSX has provided its conditional approval of the Offering and the listing of the Common Shares.

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Delivery of the Base Shelf Prospectus, the Prospectus Supplement, and any amendments to such documents will be satisfied in accordance with the “access equals delivery” provisions of applicable securities legislation. The Prospectus Supplement, the Base Shelf Prospectus, and any amendment, as applicable, are accessible under the Company’s profile on SEDAR+ at www.sedarplus.ca. An electronic or paper copy of the Prospectus Supplement, the Base Shelf Prospectus, and any amendment, as applicable, may be obtained, without charge, from Stifel Nicolaus Canada Inc. by email at prospectuscanada@stifel.com by providing the contact with an email address or address, as applicable.

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This press release shall not constitute an offer to sell or a solicitation of an offer to buy the Common Shares in the United States. 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”), and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the U.S. Securities Act.

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About Allied Gold Corporation

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Allied is a Canadian-based gold producer with a significant growth profile and mineral endowment, operating a portfolio of three producing assets and development projects located in Côte d’Ivoire, Mali, and Ethiopia. Led by a team of mining executives with operational and development experience and a proven track record of creating value, Allied is progressing through exploration, construction, and operational enhancements to become a mid-tier, next-generation gold producer in Africa and ultimately a leading senior global gold producer.

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For further information, please contact:

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Allied Gold Corporation
Royal Bank Plaza, North Tower
200 Bay Street, Suite 2200, Toronto, ON M5J 2J3 Canada
Email: ir@alliedgold.com

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION AND STATEMENTS

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This press release contains “forward-looking information” under applicable Canadian securities legislation. Except for statements of historical fact relating to the Company, information contained herein constitutes forward-looking information, including, but not limited to, any information as to the Company’s strategy, objectives, plans or future financial or operating performance. Forward-looking statements are characterized by words such as “plan”, “expect”, “budget”, “target”, “project”, “intend”, “believe”, “anticipate”, “estimate” and other similar words or negative versions thereof, or statements that certain events or conditions “may”, “will”, “should”, “would” or “could” occur. Forward-looking information included in this press release includes, without limitation, statements with respect to information concerning the Offering, the completion of the Offering on the timeline indicated, or at all; the exercise of the over-allotment option; the receipt of all necessary approvals; and the Company’s goals to become a mid-tier, next-generation gold producer in Africa and ultimately a leading senior global gold producer. Forward-looking information is based on the opinions, assumptions and estimates of management considered reasonable at the date the statements are made, and is inherently subject to a variety of risks and uncertainties and other known and unknown factors that could cause actual events or results to differ materially from those projected in the forward-looking information. These factors include the state of the financial markets and their impact on the ability of the Company to raise the gross proceeds currently anticipated by the Company; a necessary re-allocation of proceeds from the Offering based on prudent business; fluctuating price of gold; risks relating to the exploration, development and operation of mineral properties, including but not limited to unusual and unexpected geologic conditions and equipment failures; risks relating to operating in emerging markets, particularly Africa, including risk of government expropriation or nationalization of mining operations; risks related to the Company’s expansion and optimization plans referred to herein not being met within the timeframe anticipated, or at all; counterparty, credit, liquidity and interest rate risks and access to financing; risks related to the Company’s current alternative financing initiatives not being met within the timeframes anticipated, or at all; health, safety and environmental risks and hazards to which the Company’s operations are subject; the Company’s ability to maintain or increase present level of gold production; risks related to dependence on products produced from the Company’s key mining assets; cost and availability of commodities; increases in costs of production, such as fuel, steel, power, labour and other consumables; risks associated with infectious diseases; uncertainty in the estimation of Mineral Reserves and Mineral Resources; the Company’s ability to replace and expand Mineral Resources and Mineral Reserves, as applicable, at its mines; factors that may affect the Company’s future production estimates, including but not limited to the quality of ore, production costs, infrastructure and availability of workforce and equipment; risks relating to partial ownerships and/or joint ventures at the Company’s operations; reliance on the Company’s existing infrastructure and supply chains at the Company’s operating mines; risks relating to the acquisition, holding and renewal of title to mining rights and permits, and changes to the mining legislative and regulatory regimes in the Company’s operating jurisdictions; limitations on insurance coverage; risks relating to illegal and artisanal mining; the Company’s compliance with anti-corruption laws; risks relating to the development, construction and start-up of new mines, including but not limited to the availability and performance of contractors and suppliers, the receipt of required governmental approvals and permits, and cost overruns; risks relating to acquisitions and divestures; title disputes or claims; risks relating to the termination of mining rights; risks relating to security and human rights; risks associated with processing and metallurgical recoveries; risks related to enforcing legal rights in foreign jurisdictions; competition in the precious metals mining industry; risks related to the Company’s ability to service its debt obligations; fluctuating currency exchange rates (including the US Dollar, Euro, West African CFA Franc and Ethiopian Birr exchange rates); risks related to the Company’s investments and use of derivatives; taxation risks; scrutiny from non-governmental organizations; labour and employment relations; risks related to third-party contractor arrangements; repatriation of funds from foreign subsidiaries; community relations; risks related to relying on local advisors and consultants in foreign jurisdictions; the impact of global financial, economic and political conditions, global liquidity, interest rates, inflation and other factors on the Company’s results of operations and market price of common shares; risks associated with financial projections; force majeure events; transactions that may result in dilution to common shares; future sales of common shares by existing shareholders; the Company’s dependence on key management personnel and executives; vulnerability of information systems including cyber attacks; as well as those factors discussed in the section entitled “Economic Trends, Business Risks and Uncertainties” in the Company’s interim management’s discussion and analysis for the three and six months ended June 30, 2025 and the section entitled “Risk Factors” in the Company’s annual information form for the year ended December 31, 2024, both of which are available at www.sedarplus.ca and are included in the Company’s filings with the SEC at www.sec.gov.