Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 84

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 84
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 are represented by a separate CUSIP number. In addition, the specific financial, legal and other terms particular to a series of debt securities are described in the prospectus supplement relating to the series. Those terms may vary from the terms described here. Accordingly, this summary is also subject to and qualified by reference to the description of the terms of the series described in the prospectus supplement. The prospectus supplement relating to a series of debt securities will describe the following terms of the series:

| • |     | the title of the series of debt securities; |

| • |     | whether they are senior debt securities or subordinated debt securities; |

| • |     | any limit on the aggregate principal amount of the series of debt securities; |

| • |     | the date or dates on which we will pay the principal of the series of debt securities; |

| • |     | the rate or rates, which may be fixed or variable, per annum at which the series of debt securities will bear 
 interest, if any, and the date or dates from which that interest, if any, will accrue;                        |

| • |     | the dates on which interest, if any, on the series of debt securities will be payable and the regular record 
 dates for the interest payment dates, as well as any other provisions regarding payment;                     |

| • |     | any provisions for redemption at the option of the holder; |

| • |     | whether the series of debt securities can be redeemed at our option and any redemption premium or make-whole 
 amount (if applicable);                                                                                      |

| • |     | the denominations in which the series of debt securities will be issuable; |

| • |     | if other than the principal amount thereof, the portion of the principal amount of the debt securities of the 
 series that will be payable upon any declaration of acceleration of maturity;                                 |

| • |     | the currency of payment of principal of, premium, if any, and interest on the series of debt securities and the                                                                              
 manner of determining the equivalent amount in the currency of the United States of America, for the purpose of determining outstanding amounts and, if applicable, for purposes of payment; |

| • |     | if the principal amount payable at maturity of the series of debt securities will not be determinable prior to                                
 maturity, the amount that will be deemed to be the principal amount thereof for any other purpose under the indenture or the debt securities; |

| • |     | any index