Mr. Graeme Jennings reports

IAMGOLD PUBLISHES 2025 ANNUAL SUSTAINABILITY REPORT

Iamgold Corp. has published its 2025 sustainability report and companion documents highlighting the company's progress and achievements across a range of environmental, social and governance practices.

"Our 2025 sustainability report reflects a year of meaningful progress and a clear demonstration that sustainability is core to how we operate at Iamgold. We continued to advance our 2030 HSEC strategy, which provides the framework for embedding responsible mining practices across every aspect of our business, from safety and water stewardship to biodiversity, energy transition and community engagement. We are moving from framework to execution, and that shift is being felt across our operations.

"None of this happens without our people. The commitment, resilience and care demonstrated by our employees, contractors and partners at Cote Gold, Westwood, Essakane, in the field and across our organization are fundamental to our sustainability performance and to who we are as Iamgold. Innovation and accountability define us, and these principles will continue to guide us as we build a mining company that creates lasting value for all of our stakeholders," said the company.

Iamgold's 2025 sustainability report presents the company's annual reporting on the sustainability topics that are material to its business and stakeholders. The report is guided by internationally recognized reporting standards and frameworks, including the Global Reporting Initiative, the Sustainability Accounting Standards Board and the Task Force on Climate-related Financial Disclosures.

The report and companion 2025 ESG performance data can be viewed and is available for download from the company's website.

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 is among the largest gold mines in production in Canada, which Iamgold operates in a 70/30 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 large-scale 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.