Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 89

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 89
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 any day as a record date for the purpose of determining the holders of                                                                                                                                              
 outstanding debt securities that are entitled to vote with respect to changes to the indenture and/or debt securities or the waiver of certain covenants. If we set a record date for this purpose, that vote or waiver may be taken only by persons who 
 are holders of outstanding debt securities of that series on the record date and must be taken prior to 90 days after the record date. (Sections 902 and 1006)                                                                                           |

Street name and other indirect holders should consult their banks or brokers for information on how approval may be granted or denied if we seek to change the indenture or the debt securities or request a waiver or consent. Redemption and Repayment The prospectus supplement will state whether the debt securities are redeemable by us or subject to repayment at the holder’s option, other than as described below under “— Optional Tax Redemption.” We or our affiliates may purchase debt securities from investors who are willing to sell from time to time, either in the open market at prevailing prices or in private transactions at negotiated prices. ( Section 1111) Our company shall not be required to establish a sinking fund. Payment of Additional Amounts We will make payments on the debt securities without withholding any taxes unless otherwise required to do so by French law. Unless otherwise specified in the prospectus supplement, if the Republic of France or any 15

tax authority therein requires us to withhold or deduct amounts from payment on a debt security for or on account of taxes or any other governmental charges, subject to the exceptions described below, we will, to the fullest extent then permitted by law, be required to pay you additional amounts so that the net amount you receive will be the amount specified in the debt security to which you would otherwise have been entitled. We will not have to pay additional amounts under any of the following circumstances:

| • |     | The holder or beneficial owner of the debt securities (or a third party holding on behalf of the holder or such                                                                                                                                  
 beneficial owner) is subject to such tax or governmental charge by reason of having some connection to the Republic of France requiring such withholding or deduction, other than the mere holding or beneficial ownership of the debt security. |

| • |     | Taxes that are imposed or levied by reason of the failure of such holder or beneficial owner to present (where                                                                                                                                      
 presentation is required) its debt security within 30 calendar days after we have made available to such holder or beneficial owner a payment under the debt securities and