Mr. Graeme Jennings reports

IAMGOLD PROVIDES NOTICE OF THIRD QUARTER 2025 RESULTS AND CONFERENCE CALL

Iamgold Corp. plans to release its third quarter 2025 operating and financial results after market hours on Tuesday, Nov. 4, 2025. Senior management will host a conference call to discuss the operating performance and financial results on Wednesday, Nov. 5, 2025, at 8:30 a.m. Eastern Time.

Listeners may access the conference call by webcast from the events section of the company's website or through the following options:

• Preregister; upon registering, you will receive a calendar booking by e-mail with dial-in details and a unique PIN; this process will bypass the operator and avoid the queue;
• Toll-free (North America): 1-833-752-3518;
• International: 1-647-846-8209;
• Webcast.

An on-line archive of the webcast will be available by accessing the company's website. A telephone replay will be available for one month following the call by dialling toll-free 1-855-669-9658 within North America or 1-412-317-0088 from international locations and entering the passcode 6671806.

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 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. 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.