Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 92

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 92
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 occurred and not been cured, as described under “— Default and Related Matters                                
 — Events of Default — What is An Event of Default?” below. A default for this purpose would also include any event that would be an event of default if the requirements for giving us default notice under the indenture or our 
 default having to continue for a specific period of time thereunder were disregarded.                                                                                                                                            |

| • |     | We must deliver to the trustee a legal opinion of our counsel, subject to customary assumptions and exclusions,                                                                                                                                          
 confirming that under then current U.S. federal income tax law we may make the above deposit without causing you to be taxed on the debt securities any differently than if we did not make the deposit and just repaid the debt securities ourselves in 
 accordance with their terms. In the case of debt securities being discharged, such opinion shall be based upon a ruling of the U.S. Internal Revenue Service or a change in applicable U.S. federal income tax law since the date of original execution  
 and delivery of the indenture. (Section 403)                                                                                                                                                                                                             |

However, even if we take these actions, a number of our obligations relating to the debt securities of the series will remain. These include the following obligations:

| • |     | to register the transfer and exchange of debt securities; |

| • |     | to replace mutilated, destroyed, lost or stolen debt securities; |

| • |     | to maintain paying agencies; and |

| • |     | to deposit money for payment in trust. |

Default and Related Matters Ranking Unless otherwise specified in the relevant prospectus supplement, the debt securities are not subordinated to any of our other unsecured debt obligations and therefore they rank equally with all our other unsecured and unsubordinated indebtedness. The debt securities are not secured by any of our property or assets. Accordingly, your ownership of debt securities means you are one of our unsecured creditors. The indenture does not limit our ability to incur additional indebtedness. Events of Default You will have special rights if an event of default occurs in respect of a series to which your debt security belongs and is not cured, as described later in this subsection. What Is an Event of Default?The term “event of default” means, with respect to a series of debt securities, any of the following:

| • |     | any amount of principal of a debt security of that series is not paid on the due date thereof and such default is                                                                                                                                        
 not remedied within a period of 15