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[SCHEDULE 13D/A] Millicom International Cellular S.A. SEC Filing

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SCHEDULE 13D/A
Rhea-AI Filing Summary

Amendment No. 22 to a Schedule 13D reports that Atlas Investissement SAS and related reporting persons beneficially own 70,470,018 common shares of Millicom International Cellular S.A., representing 42.2% of the outstanding common stock (based on 167,083,756 shares outstanding as of July 31, 2025). The filing discloses European-style call spread option transactions entered into on August 20, 2025 providing Atlas Investissement with economic exposure to up to 1,111,111 Common Shares per counterparty, exercisable in 40 tranches and settled in shares or cash under certain conditions. On September 2, 2025 Atlas Investissement amended the confirmations to extend the initial hedging period from 10 to 20 business days. The filing adds three amendment confirmations as exhibits.

Emendamento n. 22 al Schedule 13D indica che Atlas Investissement SAS e le persone correlate detengono in via beneficiaria 70.470.018 azioni ordinarie di Millicom International Cellular S.A., pari al 42,2% del capitale sociale in circolazione (su 167.083.756 azioni in circolazione al 31 luglio 2025). La comunicazione descrive operazioni su opzioni call spread di stile europeo stipulate il 20 agosto 2025 che conferiscono a Atlas Investissement un'esposizione economica fino a 1.111.111 azioni ordinarie per controparte, esercitabili in 40 tranche e regolabili in azioni o in contanti in determinate condizioni. Il 2 settembre 2025 Atlas Investissement ha modificato le conferme per estendere il periodo iniziale di copertura da 10 a 20 giorni lavorativi. La dichiarazione include tre conferme di emendamento come allegati.

Enmienda n.º 22 al Schedule 13D informa que Atlas Investissement SAS y las personas relacionadas poseen beneficiariamente 70.470.018 acciones ordinarias de Millicom International Cellular S.A., lo que representa el 42,2% del capital social en circulación (sobre 167.083.756 acciones en circulación a 31 de julio de 2025). La presentación revela operaciones con opciones call spread de estilo europeo celebradas el 20 de agosto de 2025 que otorgan a Atlas Investissement exposición económica hasta 1.111.111 acciones ordinarias por contraparte, ejercitables en 40 tramos y liquidables en acciones o en efectivo bajo ciertas condiciones. El 2 de septiembre de 2025 Atlas Investissement enmendó las confirmaciones para ampliar el período inicial de cobertura de 10 a 20 días hábiles. La presentación añade tres confirmaciones de enmienda como anexos.

Schedule 13D에 대한 수정안 제22호는 Atlas Investissement SAS 및 관련 보고자가 Millicom International Cellular S.A.의 보통주 70,470,018주를 실질적으로 보유하고 있음을 보고하며, 이는 발행 보통주 총수의 42.2%에 해당합니다(2025년 7월 31일 기준 발행주식수 167,083,756주). 제출서는 2025년 8월 20일 체결된 유럽형 콜 스프레드 옵션 거래를 공개하는데, 해당 거래는 각 상대방당 최대 1,111,111주에 대한 경제적 노출을 Atlas Investissement에 제공하며 40개 트랜치로 행사 가능하고 특정 조건에서 주식 또는 현금으로 결제됩니다. 2025년 9월 2일 Atlas Investissement는 초기 헤지 기간을 10거래일에서 20거래일로 연장하도록 확인서를 수정했습니다. 제출서에는 세 건의 수정 확인서가 증빙으로 추가되어 있습니다.

Avenant n°22 au Schedule 13D indique qu'Atlas Investissement SAS et les personnes déclarantes liées détiennent en titres bénéficiaires 70 470 018 actions ordinaires de Millicom International Cellular S.A., représentant 42,2% du capital social en circulation (sur 167 083 756 actions en circulation au 31 juillet 2025). Le dépôt divulgue des opérations d'options call spread de style européen conclues le 20 août 2025, offrant à Atlas Investissement une exposition économique allant jusqu'à 1 111 111 actions ordinaires par contrepartie, exerçable en 40 tranches et réglable en actions ou en numéraire sous certaines conditions. Le 2 septembre 2025, Atlas Investissement a modifié les confirmations pour prolonger la période initiale de couverture de 10 à 20 jours ouvrables. Le dossier ajoute trois confirmations d'amendement en pièces jointes.

Änderung Nr. 22 zu einem Schedule 13D berichtet, dass Atlas Investissement SAS und die zugehörigen meldepflichtigen Personen wirtschaftlich 70.470.018 Stammaktien von Millicom International Cellular S.A. halten, was 42,2% des ausstehenden Stammkapitals entspricht (bei 167.083.756 ausstehenden Aktien zum 31. Juli 2025). Die Einreichung legt europäische Call-Spread-Optionstransaktionen offen, die am 20. August 2025 abgeschlossen wurden und Atlas Investissement eine wirtschaftliche Position von bis zu 1.111.111 Stammaktien je Gegenseite verschaffen, ausübbar in 40 Tranchen und unter bestimmten Bedingungen in Aktien oder bar abgerechnet. Am 2. September 2025 änderte Atlas Investissement die Bestätigungen, um den anfänglichen Absicherungszeitraum von 10 auf 20 Geschäftstage zu verlängern. Die Einreichung fügt drei Änderungsbestätigungen als Anlagen bei.

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Insights

TL;DR: A controlling group discloses a 42.2% stake and option structures that create additional economic exposure; this is material to ownership and potential influence.

The disclosure confirms Atlas Investissement and affiliated parties collectively hold 70,470,018 Common Shares, equal to 42.2% of Millicom's outstanding common stock, a level that can materially affect corporate control dynamics. The August 20, 2025 call spread transactions provide incremental economic exposure up to specified caps (each up to 1,111,111 shares) with staggered tranche expirations, and the September 2, 2025 amendment extended hedging from 10 to 20 business days, altering the counterparties' hedging timeline. For investors, this filing clarifies the scale of the reporting group's position and the existence of derivative-based exposure that could impact future share supply or demand under settlement terms.

TL;DR: The Niel family structure is disclosed as sharing beneficial ownership over 42.2% of the shares, a governance-relevant concentration.

The Schedule 13D amendment reiterates that Atlas Investissement is controlled up the chain by Iliad Holding and Maya and that the Niel family may be deemed to share beneficial ownership of the 42.2% stake. This level of concentrated ownership is governance-significant because it may enable substantial influence over board composition and strategic decisions. The filing also documents option transactions and an extension of hedging periods with major French banks, adding complexity to how economic exposure might be translated into voting or settlement outcomes under the stated settlement mechanisms.

Emendamento n. 22 al Schedule 13D indica che Atlas Investissement SAS e le persone correlate detengono in via beneficiaria 70.470.018 azioni ordinarie di Millicom International Cellular S.A., pari al 42,2% del capitale sociale in circolazione (su 167.083.756 azioni in circolazione al 31 luglio 2025). La comunicazione descrive operazioni su opzioni call spread di stile europeo stipulate il 20 agosto 2025 che conferiscono a Atlas Investissement un'esposizione economica fino a 1.111.111 azioni ordinarie per controparte, esercitabili in 40 tranche e regolabili in azioni o in contanti in determinate condizioni. Il 2 settembre 2025 Atlas Investissement ha modificato le conferme per estendere il periodo iniziale di copertura da 10 a 20 giorni lavorativi. La dichiarazione include tre conferme di emendamento come allegati.

Enmienda n.º 22 al Schedule 13D informa que Atlas Investissement SAS y las personas relacionadas poseen beneficiariamente 70.470.018 acciones ordinarias de Millicom International Cellular S.A., lo que representa el 42,2% del capital social en circulación (sobre 167.083.756 acciones en circulación a 31 de julio de 2025). La presentación revela operaciones con opciones call spread de estilo europeo celebradas el 20 de agosto de 2025 que otorgan a Atlas Investissement exposición económica hasta 1.111.111 acciones ordinarias por contraparte, ejercitables en 40 tramos y liquidables en acciones o en efectivo bajo ciertas condiciones. El 2 de septiembre de 2025 Atlas Investissement enmendó las confirmaciones para ampliar el período inicial de cobertura de 10 a 20 días hábiles. La presentación añade tres confirmaciones de enmienda como anexos.

Schedule 13D에 대한 수정안 제22호는 Atlas Investissement SAS 및 관련 보고자가 Millicom International Cellular S.A.의 보통주 70,470,018주를 실질적으로 보유하고 있음을 보고하며, 이는 발행 보통주 총수의 42.2%에 해당합니다(2025년 7월 31일 기준 발행주식수 167,083,756주). 제출서는 2025년 8월 20일 체결된 유럽형 콜 스프레드 옵션 거래를 공개하는데, 해당 거래는 각 상대방당 최대 1,111,111주에 대한 경제적 노출을 Atlas Investissement에 제공하며 40개 트랜치로 행사 가능하고 특정 조건에서 주식 또는 현금으로 결제됩니다. 2025년 9월 2일 Atlas Investissement는 초기 헤지 기간을 10거래일에서 20거래일로 연장하도록 확인서를 수정했습니다. 제출서에는 세 건의 수정 확인서가 증빙으로 추가되어 있습니다.

Avenant n°22 au Schedule 13D indique qu'Atlas Investissement SAS et les personnes déclarantes liées détiennent en titres bénéficiaires 70 470 018 actions ordinaires de Millicom International Cellular S.A., représentant 42,2% du capital social en circulation (sur 167 083 756 actions en circulation au 31 juillet 2025). Le dépôt divulgue des opérations d'options call spread de style européen conclues le 20 août 2025, offrant à Atlas Investissement une exposition économique allant jusqu'à 1 111 111 actions ordinaires par contrepartie, exerçable en 40 tranches et réglable en actions ou en numéraire sous certaines conditions. Le 2 septembre 2025, Atlas Investissement a modifié les confirmations pour prolonger la période initiale de couverture de 10 à 20 jours ouvrables. Le dossier ajoute trois confirmations d'amendement en pièces jointes.

Änderung Nr. 22 zu einem Schedule 13D berichtet, dass Atlas Investissement SAS und die zugehörigen meldepflichtigen Personen wirtschaftlich 70.470.018 Stammaktien von Millicom International Cellular S.A. halten, was 42,2% des ausstehenden Stammkapitals entspricht (bei 167.083.756 ausstehenden Aktien zum 31. Juli 2025). Die Einreichung legt europäische Call-Spread-Optionstransaktionen offen, die am 20. August 2025 abgeschlossen wurden und Atlas Investissement eine wirtschaftliche Position von bis zu 1.111.111 Stammaktien je Gegenseite verschaffen, ausübbar in 40 Tranchen und unter bestimmten Bedingungen in Aktien oder bar abgerechnet. Am 2. September 2025 änderte Atlas Investissement die Bestätigungen, um den anfänglichen Absicherungszeitraum von 10 auf 20 Geschäftstage zu verlängern. Die Einreichung fügt drei Änderungsbestätigungen als Anlagen bei.






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).






SCHEDULE 13D




Comment for Type of Reporting Person:
(1) Reflects 70,470,018 common shares, par value $1.50 per share ("Common Shares") of Millicom International Cellular S.A., a Luxembourg company (the "Issuer"), beneficially owned by Atlas Investissement SAS, a company incorporated under French law as a societe par actions simplifiee ("Atlas Investissement"). 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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 70,470,018 Common Shares beneficially owned by Atlas Investissement. 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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 70,470,018 Common Shares beneficially owned by Atlas Investissement. 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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 70,470,018 Common Shares beneficially owned by Atlas Investissement. 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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 70,470,018 Common Shares beneficially owned by Atlas Investissement. 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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 70,470,018 Common Shares beneficially owned by Atlas Investissement. 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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 70,470,018 Common Shares beneficially owned by Atlas Investissement. 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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 70,470,018 Common Shares beneficially owned by Atlas Investissement. 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 167,083,756 Common Shares outstanding as of July 31, 2025 (169,000,000 Common Shares outstanding, less 1,916,244 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:09/04/2025
Iliad Holding SAS
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel, President of Maya SAS, itself President of Iliad
Date:09/04/2025
Maya SAS
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel, President
Date:09/04/2025
Xavier Niel
Signature:/s/ Xavier Niel
Name/Title:Xavier Niel
Date:09/04/2025
Jules Niel
Signature:/s/ Jules Niel
Name/Title:Jules Niel
Date:09/04/2025
John Niel
Signature:/s/ John Niel
Name/Title:John Niel
Date:09/04/2025
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:09/04/2025
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:09/04/2025

FAQ

How many Millicom (TIGO) shares do the reporting persons beneficially own?

The reporting persons beneficially own 70,470,018 common shares, representing 42.2% of Millicom's outstanding common stock as stated in the filing.

What derivative transactions were disclosed in Amendment No. 22?

Atlas Investissement entered into European-style call spread option transactions on August 20, 2025 providing economic exposure to up to 1,111,111 shares per counterparty, exercisable in 40 tranches and settled in shares or cash subject to conditions.

What change did the September 2, 2025 amendment make?

The September 2, 2025 amendment extended the initial hedging period for the Transactions from 10 business days to 20 business days.

Which counterparties are identified for the amendment confirmations filed as exhibits?

The filing adds amendment confirmations with Credit Agricole CIB, Natixis, and Société Générale as Exhibits 28, 29 and 30.

Who may be deemed to share beneficial ownership of the disclosed shares?

Iliad Holding, Maya and members of the Niel family (Xavier, Jules, John, Elisa and Joseph Niel) may be deemed to share beneficial ownership as described in the filing.
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