Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 12

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 12
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30-daymonths) at the Treasury Rate plus (i) % (or basis points), in the case of the 20 Fixed Rate Notes; and (ii) % (or basis points), in the case of the 20 Fixed Rate Notes; less (b) unpaid interest, if any, accrued thereon to the date of redemption, and (2) 100% of the principal amount of the notes to be redeemed,

| plus, in either case, accrued and unpaid interest thereon to the redemption date (but not including the redemption date). |

| On or after the applicable Par Call Date, the Issuer may redeem the relevant series of the 20    Fixed Rate Notes and the 20    Fixed Rate Notes, in whole or in part, at any time and                             
 from time to time, at a redemption price equal to 100% of the principal amount of the relevant series of the 20    Fixed Rate Notes and the 20    Fixed Rate Notes being redeemed, as applicable, plus accrued and 
 unpaid interest thereon to the relevant redemption date.                                                                                                                                                           |

S-9

| The Issuer may redeem the 20    Fixed Rate Notes at its option, in whole or in part, at any time and from time to time, at a redemption price (expressed as a percentage of principal amount and rounded 
 to three decimal places) equal to the greater of:                                                                                                                                                        |

(1) (a) the sum of the present values of the Remaining Scheduled Payments of principal and interest thereon discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus % (or basis points) less (b) unpaid interest, if any, accrued thereon to the date of redemption, and (2) 100% of the principal amount of the notes to be redeemed,

| plus, in either case, accrued and unpaid interest thereon to the redemption date (but not including the redemption date). |

| See “Description of the Notes—Redemption—Optional Redemption.” |

PROVISIONS APPLICABLE TO THE FLOATING RATE NOTES

| Maturity Date | 20   floating rate notes:   , 20 |

| 20   floating rate notes:   , 20 |