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.

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).




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SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 common shares, par value $1.50 per share ("Common Shares") of Millicom International Cellular S.A., a Luxembourg company (the "Issuer"), referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement SAS , a company incorporated under French law as a societe par actions simplifiee ("Atlas Investissement"), plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements (as defined in Item 4 below) on or before June 30, 2026. Iliad Holding SAS ("Iliad Holding"), as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya SAS ("Maya"), as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. Xavier Niel, the President of Maya, Jules Niel, John Niel, Elisa Niel and Joseph Niel (together, the "Niel Family") may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 Common Shares, referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement, plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements on or before June 30, 2026. Iliad Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya, as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. The Niel Family may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 Common Shares, referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement, plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements on or before June 30, 2026. Iliad Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya, as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. The Niel Family may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 Common Shares, referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement, plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements on or before June 30, 2026. Iliad Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya, as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. The Niel Family may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 Common Shares, referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement, plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements on or before June 30, 2026. Iliad Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya, as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. The Niel Family may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 Common Shares, referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement, plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements on or before June 30, 2026. Iliad Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya, as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. The Niel Family may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 Common Shares, referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement, plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements on or before June 30, 2026. Iliad Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya, as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. The Niel Family may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 73,820,018 Common Shares, referred to herein on the same basis as disclosed in Amendment No. 26 to the Schedule 13D, beneficially owned by Atlas Investissement, plus 3,250,000 additional Common Shares that Atlas Investissement expects to purchase under the Amended Equity Derivative Transaction Agreements on or before June 30, 2026. Iliad Holding, as the controlling shareholder of Atlas Investissement, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement. Maya, as the controlling shareholder of Iliad Holding, may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Iliad Holding and Atlas Investissement. The Niel Family may be deemed to have shared beneficial ownership over the Common Shares beneficially owned by Atlas Investissement, Iliad Holding and Maya. (2) The percentage reflected in row 13 in the table above is calculated on the basis of 167,540,829 Common Shares outstanding as of February 28, 2026 (169,000,000 Common Shares outstanding, less 1,459,171 Common Shares held in treasury), as set forth in the last relevant update available on the date hereof on the Issuer's website.


SCHEDULE 13D


 
Atlas Investissement SAS
 
Signature:/s/ Anthony Maarek
Name/Title:Anthony Maarek, Managing Director
Date:03/27/2026
 
Iliad Holding SAS
 
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel, President of Maya SAS, itself President of Iliad Holding SAS
Date:03/27/2026
 
Maya SAS
 
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel, President
Date:03/27/2026
 
Xavier Niel
 
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel
Date:03/27/2026
 
Jules Niel
 
Signature:/s/ Jules Niel
Name/Title:Jules Niel
Date:03/27/2026
 
John Niel
 
Signature:/s/ John Niel
Name/Title:John Niel
Date:03/27/2026
 
Elisa Niel
 
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel, Attorney-in-Fact, for and on behalf of as Parent/Guardian of Elisa Niel
Date:03/27/2026
 
Joseph Niel
 
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel, Attorney-in-Fact, for and on behalf of as Parent/Guardian of Joseph Niel
Date:03/27/2026

ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

EXHIBIT 99.45

EXHIBIT 99.46

EXHIBIT 99.47

EXHIBIT 99.48

EXHIBIT 99.49

EXHIBIT 99.50

EXHIBIT 99.51

EXHIBIT 99.52

EXHIBIT 99.53

EXHIBIT 99.54

EXHIBIT 99.55

EXHIBIT 99.56

EXHIBIT 99.57

EXHIBIT 99.58

EXHIBIT 99.59

EXHIBIT 99.60

EXHIBIT 99.61

EXHIBIT 99.62