Mr. Renaud Adams reports

Iamgold ANNOUNCES CLOSING OF NORTHERN SUPERIOR ACQUISITION

Iamgold Corp. has completed the previously announced arrangement with Northern Superior Resources Inc., pursuant to which Iamgold acquired all of the issued and outstanding common shares of Northern Superior by way of a plan of arrangement under Division 5 of Part 9 of the Business Corporations Act (British Columbia). All monetary amounts are expressed in U.S. dollars, unless otherwise indicated.

"With the completion of the acquisition of Northern Superior and its assets, Iamgold's Nelligan mining complex in the Chibougamau-Chapais region of Quebec is now among the largest preproduction gold projects in Canada," said Renaud Adams, president and chief executive officer of Iamgold. "We look forward to accelerating our exploration program in the region with a goal of further expansion and extension of the mineralization at Nelligan, Philibert and Monster Lake as we look to continue to grow the mineralization and advance a project that complements both the scale and timing of our Cote gold mine and its forthcoming expansion."

As a result of the completion of the transaction and the acquisition by Iamgold of all of the Northern Superior shares, Northern Superior became a wholly owned subsidiary of Iamgold. Former Northern Superior shareholders are entitled to receive, in exchange for each Northern Superior share held immediately prior to the effective time of the transaction, a combination of: (i) 0.0991 of an Iamgold common share; and (ii) 19 cents in cash. The transaction also included a concurrent distribution to Northern Superior's shareholders of all the common shares in the capital of Ongold Resources Ltd. previously held by Northern Superior. Full details of the transaction are included in Northern Superior's management information circular dated Nov. 10, 2025, which can be found under Northern Superior's profile on SEDAR+. The Northern Superior shares will be delisted from the TSX Venture Exchange, and an application will be made for Northern Superior to cease to be a reporting issuer in Ontario, British Columbia, Alberta and Quebec.

About Iamgold Corp.

Iamgold is an intermediate gold producer and developer based in Canada with operating mines in North America and West Africa, including Cote gold (Canada), Westwood (Canada) and Essakane (Burkina Faso). The Cote gold mine achieved full nameplate in June, 2025, and has the potential to be among the largest gold mines in Canada. Iamgold operates Cote gold in partnership with Sumitomo Metal Mining Co. Ltd. In addition, the company has an established portfolio of early-stage and advanced exploration projects within high-potential mining districts, including the Nelligan mining complex located in Quebec, Canada. Iamgold employs approximately 3,700 people, and is committed to maintaining its culture of accountable mining through high standards of environmental, social and governance practices. Iamgold is listed on the New York Stock Exchange and the Toronto Stock Exchange.

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