Company: SNY
Filing Date: 2025-06-17
Form Type: SC TO-T
Source: 0001193125-25-141704
Chunk: 3

Company: Sanofi
Filing Date: 2025-06-17
Form: SC TO-T
Chunk 3
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 |     | Section 3 – “Procedures for Accepting the Offer and Tendering Shares” |

| • |     | Section 4 – “Withdrawal Rights” |

| • |     | Section 5 – “Certain U.S. Federal Income Tax Consequences of the Offer” |

| • |     | 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” |

| • |     | Section 15 – “Conditions of the Offer” |

| • |     | Section 16 – “Certain Legal Matters; Regulatory Approvals” |

| • |     | Section 17 – “Appraisal Rights” |

| • |     | Section 19 – “Miscellaneous” |

(a)(1)(ix) and (xi), (a)(2)(v) – (vi) Not applicable. Item 5. Past Contacts, Transactions, Negotiations and Agreements. (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 7 – “Certain Information Concerning the Company” |

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

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

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

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

| • |     | Schedule I |

Item 6. Purposes of the Transaction and Plans or Proposals. (a), (c)(1) – (7) 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 6 – “Price Range of Shares; Dividends on the Shares” |

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