6-K

UNITED STATESSECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2025

Commission File Number: 001-31528

IAMGOLD Corporation
(Translation of registrant's name into English)

150 King Street West, Suite 2200Toronto, ON Canada M5H 1J9 Tel: (416) 360-4710 (Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

[   ] Form 20-F                        [ x ] Form 40-F

SUBMITTED HEREWITH

Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

IAMGOLD Corporation: Exhibit 99.1 - Filed by newsfilecorp.com

IAMGOLD PROVIDES NOTICE OF THIRD QUARTER 2025 RESULTS AND CONFERENCE CALL

Toronto, Ontario, October 9, 2025 - IAMGOLD Corporation (NYSE: IAG) (TSX: IMG) ("IAMGOLD" or the "Company") is pleased to announce it plans to release its third quarter 2025 operating and financial results after market hours on Tuesday, November 4, 2025. Senior management will host a conference call to discuss the operating performance and financial results on Wednesday, November 5, 2025, at 8:30 a.m. (Eastern Time).

Listeners may access the conference call via webcast from the events section of the Company's website at www.iamgold.com (webcast link below), or through the following options:

Pre-register via: Chorus Call IAMGOLD Q3 2025 Registration (recommended) - Upon registering, you will receive a calendar booking by email with dial-in details and 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: https://event.choruscall.com/mediaframe/webcast.html?webcastid=EqcFQg71

An online archive of the webcast will be available by accessing the Company's website at www.iamgold.com. A telephone replay will be available for one month following the call by dialing toll free 1 (855) 669-9658 within North America or 1 (412) 317-0088 from international locations and entering the passcode: 6671806.

About IAMGOLD

IAMGOLD is an intermediate gold producer and developer based in Canada with operating mines in North America and West Africa, including Côté Gold (Canada), Westwood (Canada) and Essakane (Burkina Faso). The Côté Gold Mine achieved full nameplate in June 2025 and has the potential to be among the largest gold mines in Canada. IAMGOLD operates Côté 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 (NYSE:IAG) and the Toronto Stock Exchange (TSX:IMG).

IAMGOLD Contact Information

Graeme Jennings, Vice President, Investor Relations

Tel: 416 360 4743 | Mobile: 416 388 6883

Toll-free: 1 888 464 9999

info@iamgold.com