6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATEISSUER

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

SECURITIES EXCHANGE ACTOF 1934

For the month of November, 2024.

__________________

Commission FileNumber: 001-38763

MILLICOM INTERNATIONAL CELLULAR S.A.

(Exact Name of Registrant as Specified in ItsCharter)

2, Rue du Fort Bourbon,

L-1249 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

______

Item1

Notification of transaction by a closelyassociated person of a Director of Millicom (Tigo)

Luxembourg,November 13, 2024 – Millicom International Cellular S.A. ("Millicom") announces that, on November 7, 2024, Atlas Luxco S.à r.l. (”Atlas”) a person closely associated (”PCA”) with Jules Niel, a member of Millicom’s Board of Directors, acquired 40,089 Millicom Swedish Depository Receipts (SDRs) in the open market at an average price of SEK 280.4 per share (the “Acquisition”). 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 40.23% of Millicom’s share capital. Details of the transaction are recorded on the personal trading section of Millicom’s website.

For further information,please contact:

AboutMillicom

Millicom (NASDAQ U.S.: TIGO, Nasdaq Stockholm: TIGO_SDB) 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 September 30, 2024, Millicom, including its Honduras Joint Venture, employed approximately 15,000 people, and provided mobile and fiber-cable services through its digital highways to more than 46 million customers, with a fiber-cable footprint over 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: November 14, 2024