Company: SNY
Filing Date: 2025-10-29
Form Type: 424B5
Source: 0001193125-25-255563
Chunk: 15

Company: Sanofi
Filing Date: 2025-10-29
Form: 424B5
Chunk 15
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 accrue during the period from and after such original maturity date or date of redemption or repayment.                                                                                  |

| U.S. Government Securities Business Day | Any day except for a Saturday, Sunday or a day on which the Securities Industry and Financial Markets Association recommends that the fixed income departments of its members be closed for the entire day for purposes of trading in U.S. government 
 securities.                                                                                                                                                                                                                                           |

PROVISIONS APPLICABLE TO ALL OF THE NOTES (FIXED AND FLOATING)

| Ranking | The notes will be unsecured and unsubordinated and therefore will rank equally with all of our other existing and future unsecured and unsubordinated indebtedness. |

| Payment of Additional Amounts | If French law requires that payments of principal and interest in respect of the notes be subject to deduction or withholding in respect of any present                                
 or future taxes or duties levied by the Republic of France, we may be required to pay holders additional amounts so that the amount holders receive will be the amount they would have |

S-11

| received had such withholding or deduction not been required, subject to certain exceptions and limitations set forth under “Description of the Notes—Payment of Additional                   
 Amounts” in this prospectus supplement. If we merge with an entity in a jurisdiction other than France, then the same will apply if withholding taxes are imposed by that other jurisdiction. |

| Optional Tax Redemption | Under certain circumstances, the notes may be redeemed, in whole but not in part, at our option at a redemption price equal to 100% of the principal amount of the notes, together with interest accrued to (but excluding) the date fixed for 
 redemption, if we would be required to pay additional amounts with respect to the notes. See “Description of the Notes—Redemption—Tax Redemption” herein and “Description of Debt Securities We May Offer—Special                              
 Situations—Optional Tax Redemption” in the attached prospectus, and “Description of the Notes—Payment of Additional Amounts” in this prospectus supplement.                                                                                    |

| Covenants and Events of Default | The terms and conditions of the notes provide for a limited negative pledge and limited conditions on certain merger and consolidation transactions and our ability to transfer our respective assets substantially as an entirety as well as for 
 certain events of default.                                                                                                                                                                                                                        |

| There are no covenants restricting our (including our subsidiaries’) ability to make payments, incur indebtedness, dispose of assets, issue and sell capital stock, enter into transactions with affiliates or engage 
 in business other than our present business