6-K

UNITEDSTATES

SECURITIESAND EXCHANGE COMMISSION

Washington,D.C. 20549

FORM6-K

REPORTOF FOREIGN PRIVATE ISSUER

PURSUANTTO RULE 13a-16 OR 15d-16 OF THE

SECURITIESEXCHANGE ACT OF 1934

For the month of March, 2024.

CommissionFile Number: 001-38763

MILLICOMINTERNATIONAL CELLULAR S.A.

(ExactName of Registrant as Specified in Its Charter)

2,Rue du Fort Bourbon,

L-1249Luxembourg

GrandDuchy of Luxembourg

(Addressof 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:

MILLICOM INTERNATIONAL CELLULAR S.A.

INDEX TO FURNISHED MATERIAL

Item

______

1. Press release dated March 12, 2024.

Millicom (Tigo) releases the2023 Annual Report

Luxembourg,March 12, 2024. – Millicom, a leading provider of fixed and mobile services in Latin America, announces today the release of its Annual Report including the standalone financial statements of Millicom International Cellular S.A. for the year 2023. For further details please click on the following link: https://www.millicom.com/results/ar-2023/

-END-

For further information, pleasecontact:

About Millicom

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 December 31, 2023, Millicom, including its Honduras Joint Venture, employed approximately 16,500 people and provided mobile and fiber-cable services through its digital highways to more than 45 million customers, with a fiber-cable footprint over 13 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 12, 2024