Company: SNY
Filing Date: 2025-06-17
Form Type: SC TO-T
Source: 0001193125-25-141704
Chunk: 4

Company: Sanofi
Filing Date: 2025-06-17
Form: SC TO-T
Chunk 4
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 with the Company” |

3

| • |     | Section 11 – “The Merger Agreement; The CVR Agreement; Other Agreements” |

| • |     | Section 12 – “Purpose of the Offer; Plans for the Company” |

| • |     | Section 13 – “Certain Effects of the Offer” |

| • |     | Schedule I |

Item 7. Source and Amount of Funds or Other Consideration. (a), (b) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference:

| • |     | the “Summary Term Sheet” |

| • |     | the “Introduction” |

| • |     | Section 9 – “Source and Amount of Funds” |

(d) Not applicable. Item 8. Interest in Securities of the Subject Company. (a) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference:

| • |     | the “Summary Term Sheet” |

| • |     | Section 8 – “Certain Information Concerning Parent, Aventis, Purchaser and Certain Related 
 Persons”                                                                                   |

| • |     | Section 11 – “The Merger Agreement; The CVR Agreement; Other Agreements” |

| • |     | Section 12 – “Purpose of the Offer; Plans for the Company” |

| • |     | Schedule I |

(b) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference:

| • |     | Section 8 – “Certain Information Concerning Parent, Aventis, Purchaser and Certain Related 
 Persons”                                                                                   |

| • |     | Schedule I |

Item 9. Persons/Assets, Retained, Employed, Compensated or Used. (a) The information set forth in the following sections of the Offer to Purchase is incorporated herein by reference:

| • |     | the “Summary Term Sheet” |

| • |     | Section 3 – “Procedures for Accepting the Offer and Tendering Shares” |

| • |     | Section 10 – “Background of the Offer; Past Contacts or Negotiations with the Company” |

| • |     | Section 18 – “Fees and Expenses” |

Item 10. Financial Statements. (a), (b) Not applicable. Item 11. Additional Information. (a)(1) The information set forth in the following sections of the Offer to Purchase is