SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 11)*

MILLICOM INTERNATIONAL CELLULAR S.A.

(Name of Issuer)

Common Shares

(Title of Class of Securities)

L6388F110

(CUSIP Number)

Denis Klimentchenko

Skadden, Arps, Slate, Meagher & Flom (UK) LLP

22 Bishopsgate

London, EC2N 4BQ

Tel: +44(0)20 7519 7289

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

May 23, 2024

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box: x

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No.: L6388F110

(1) Reflects 49,966,734 Swedish Depositary Receipts (“SDRs”) beneficially owned by Atlas Luxco S.à r.l. (“Atlas”), which may be exchanged for Issuer common shares, par value $1.50 per share (“Common Shares”), on a one-for-one basis. Atlas Investissement, as the controlling shareholder of Atlas, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas. NJJ Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas and Atlas Investissement. Xavier Niel, as the sole owner of NJJ Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas, Atlas Investissement and NJJ Holding.

CUSIP No.: L6388F110

(1) Reflects 49,966,734 SDRs beneficially owned by Atlas, which may be exchanged for Common Shares on a one-for-one basis. Atlas Investissement, as the controlling shareholder of Atlas, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas. NJJ Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas and Atlas Investissement. Xavier Niel, as the sole owner of NJJ Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas, Atlas Investissement and NJJ Holding.

CUSIP No.: L6388F110

(1) Reflects 49,966,734 SDRs beneficially owned by Atlas, which may be exchanged for Common Shares on a one-for-one basis. Atlas Investissement, as the controlling shareholder of Atlas, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas. NJJ Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas and Atlas Investissement. Xavier Niel, as the sole owner of NJJ Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas, Atlas Investissement and NJJ Holding.

CUSIP No.: L6388F110

(1) Reflects 49,966,734 SDRs beneficially owned by Atlas, which may be exchanged for Common Shares on a one-for-one basis. Atlas Investissement, as the controlling shareholder of Atlas, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas. NJJ Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas and Atlas Investissement. Xavier Niel, as the sole owner of NJJ Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas, Atlas Investissement and NJJ Holding.

Explanatory Note

This Amendment No. 11 (“Amendment No. 11”) to Schedule 13D relates to the Common Shares, par value $1.50 per share (the “Common Shares”), of Millicom International Cellular S.A., a Luxembourg company (the “Issuer”), and amends and supplements the initial statement on Schedule 13D filed on February 24, 2023, as amended by Amendment No. 1 to the Schedule 13D filed on March 28, 2023, as amended by Amendment No. 2 to the Schedule 13D filed on April 26, 2023, as amended by Amendment No. 3 to the Schedule 13D filed on May 12, 2023, as amended by Amendment No. 4 to the Schedule 13D filed on May 25, 2023, as amended by Amendment No. 5 to the Schedule 13D filed on June 2, 2023 (“Amendment No. 5”), as amended by Amendment No. 6 to the Schedule 13D filed on July 24, 2023 (“Amendment No. 6”), as amended by Amendment No. 7 to the Schedule 13D filed on August 24, 2023 (“Amendment No. 7”), as amended by Amendment No. 8 to the Schedule 13D filed on October 2, 2023 (“Amendment No. 8”), as amended by Amendment No. 9 to the Schedule 13D filed on November 8, 2023, as amended by Amendment No. 10 to the Schedule 13D filed on January 17, 2024 (“Amendment No. 10”, and as so amended, the “Schedule 13D”). Capitalized terms used but not defined in this Amendment No. 11 shall have the same meanings ascribed to them in the Schedule 13D.

Item 4. Purpose of Transaction.

Item 4 of the Schedule 13D is hereby amended and supplemented as follows:

On May 23, 2024, Atlas Investissement announced that it is exploring a potential all cash tender offer for the Issuer’s securities. In connection with such preliminary efforts, Atlas is exploring financing options to support an offer price of $24.0 per Common Share, and its SEK equivalent per SDR. Atlas Investissement also furnished Millicom’s Board of Directors with a letter of intent (the “Letter of Intent”) noting that the potential offer price would represent a 19% premium to Millicom’s volume-weighted average price for the previous 3 months; a 27% premium over its volume-weighted average price for the previous 6 months and a 38% premium to Millicom’s volume-weighted average price for the previous 12 months. The Letter of Intent also notes that the potential offer price would be higher than the median of brokers’ time-adjusted target prices and would provide immediate liquidity for Millicom’s shareholders. No assurances can be given that any such offer will be made by Atlas Investissement, or if one is made, as to its terms or timing.

Additionally, Atlas Investissement has amended from time to time the Loan Agreement initially entered into with a syndicate of lenders on February 20, 2023 (as amended from time to time including for the last time on 13 March 2024, the “Loan Agreement”) pursuant to amendment agreements (the "Loan Agreement Amendments").

The foregoing description of the amendments to the Letter of Intent and Loan Agreement Amendments described above are qualified in their entirety by reference to such documents, which are filed as an exhibits hereto and incorporated herein by reference.

Item 5. Interest in Securities of the Issuer.

Items 5(a)-(c) of the Schedule 13D are hereby amended and restated as follows:

(a) and (b) The percentage of beneficial ownership in this Schedule 13D is based on 171,188,466 Common Shares outstanding as of May 3, 2024 (based on 172,096,305 Common Shares outstanding, less 907,839 Common Shares held in treasury, as set forth in the last relevant update available on the date hereof in the “Financial News” section of the Issuer's website).

The aggregate number and percentage of Common Shares beneficially owned by each Reporting Person and, for each Reporting Person, the number of shares as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, or shared power to dispose or to direct the disposition are set forth on rows 7 through 11 and row 13 of the cover pages of this Schedule 13D and are incorporated herein by reference.

As of May 23, 2024, Atlas beneficially owned 49,966,734 SDRs, which may be exchanged for Common Shares on a one-for-one basis.

Neither the filing of this Schedule 13D nor any of its contents shall be deemed to constitute an admission that any Reporting Person (other than Atlas to the extent it directly holds the securities reported herein) is the beneficial owner of the Common Shares referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose and each of the Reporting Persons expressly disclaims beneficial ownership of such shares.

(c) The Reporting Persons have not effected any transactions in Common Shares during the past sixty days.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

Item 6 of the Schedule 13D is hereby amended and supplemented as follows:

The information set forth in Item 4 of this Amendment No. 11 is incorporated herein by reference.

Item 7. Material to be filed as Exhibits.

Item 7 of the Schedule 13D is hereby amended by adding the following exhibits:

5        Letter of Intent, dated May 23, 2024

6        Loan Agreement Amendment, dated March 7, 2024

7       Loan Agreement Amendment, dated March 13, 2024

SIGNATURES

After reasonable inquiry and to the best of each of the undersigned’s knowledge and belief, each of the undersigned, severally and not jointly, certifies that the information set forth in this statement is true, complete and correct.

Dated: May 23, 2024

[Millicom International Cellular S.A. - Schedule 13D/A]

ATTACHMENTS / EXHIBITS

EXHIBIT 5

EXHIBIT 6

EXHIBIT 7