SEC Form 6-K filed by Millicom International Cellular S.A.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of March, 2025.

Commission File Number: 001-38763

MILLICOM INTERNATIONAL CELLULAR S.A.

(Exact Name of Registrant as Specified in Its Charter)

148-150, Boulevard de la Pétrusse

L-2330 Luxembourg

Grand Duchy of Luxembourg

(Address of principal executive office)

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

Form 20-F x Form 40-F ¨

MILLICOM INTERNATIONAL CELLULAR S.A.

INDEX TO FURNISHED MATERIAL

Item
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Item 1

Notification of transaction by a closely associated person of a Director of Millicom (Tigo)

Luxembourg, March 20, 2025 – Millicom International Cellular S.A. ("Millicom") announces that, on March 17, 2025, Atlas S.A.S. (”Atlas”) a person closely associated (”PCA”) with Jules Niel, a member of Millicom’s Board of Directors, informed that it acquired 344,797 Millicom Swedish Depository Receipts (SDRs) in Nasdaq Stockholm (the “Acquisition”) at an average price of SEK 299.77 per SDR.

The Acquisition by Atlas was made via a mandate given to an investment bank to purchase SDRs on behalf and for the account of the PCA, ensuring that individuals making investment decisions do not have access to material non-public information.

Mr. Jules Niel does not directly hold any Millicom shares, but he is a member of the Niel family group, which beneficially own Atlas.

For further information, please contact:

About Millicom

Millicom (NASDAQ U.S.: TIGO) is a leading provider of fixed and mobile telecommunications services in Latin America. Through our TIGO^® and Tigo Business^® brands, we provide a wide range of digital services and products, including TIGO Money for mobile financial services, TIGO Sports for local entertainment, TIGO ONEtv for pay TV, high-speed data, voice, and business-to-business solutions such as cloud and security. As of December 31, 2024, Millicom, including its Honduras Joint Venture, employed approximately 14,000 people, and provided mobile and fiber-cable services through its digital highways to more than 46 million customers, with a fiber-cable footprint of about 14 million homes passed. Founded in 1990, Millicom International Cellular S.A. is headquartered in Luxembourg.

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.

Date: March 21, 2025