Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 90

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 90
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 of France. Optional Tax Redemption Unless otherwise specified in the prospectus supplement for a particular series, we have the option to redeem the debt securities of any series prior to maturity if, upon the occurrence of any change in, or any change in the official application or interpretation of, French law (or the law of the jurisdiction of our successor, or of our new jurisdiction of organization or residency for tax purposes), becoming effective after the issuance date of the debt securities of the series (or in the case of a successor to the Issuer, the date on which such person assumed 16

our obligations under the debt securities of the series as described under “— Mergers and Similar Events”), we would be required to pay additional amounts as described under “— Payment of Additional Amounts”, in which case we may redeem the debt securities of the series in whole but not in part at a redemption price equal to 100% of the principal amount of the debt securities of the series plus accrued interest to (but not including) the redemption date. Furthermore, the redemption date shall be no earlier than 90 days before the latest practicable date on which we could make payment of principal and interest without withholding for such French taxes (or the taxes arising from the law of any other jurisdiction of incorporation or residency referred to above). ( Section 1108) Prior to giving the notice of a tax redemption, we will deliver to the trustee

| • |     | a certificate signed by a duly authorized officer stating that we are entitled to effect the redemption and           
 setting forth a statement of facts showing that the conditions precedent to our right to so redeem have occurred; and |

| • |     | an opinion of legal counsel stating that we are or would be obligated to pay additional amounts as a result of                                                                                                                                         
 such change or amendment in the official application or interpretation of French law (or, in the case of a successor to the Issuer, in the official application or interpretation of the law of the jurisdiction of incorporation or residency for tax 
 purposes of such successor).                                                                                                                                                                                                                           |

Negative Pledge In respect of any series of unsubordinated debt securities only, so long as any such debt security is outstanding, Sanofi S.A. undertakes not to create or permit to subsist any mortgage, charge, pledge, lien (other than a lien arising by operation of law) or other encumbrance or security interest over any or all of its present or future assets or revenues (i) to secure any Relevant Indebtedness issued by it or (ii