Company: SNY
Filing Date: 2025-10-29
Form Type: 424B5
Source: 0001193125-25-255563
Chunk: 33

Company: Sanofi
Filing Date: 2025-10-29
Form: 424B5
Chunk 33
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 next
business day. Payments postponed to the next business day in this situation will be treated under the Indenture as if they were made on the original due date. Postponements of this kind will not result in a default under the Fixed Rate Notes or the
Indenture, and no interest will accrue on the postponed amount from the original due date to the next day that is a business day.

Floating Rate Notes

The 2027 Floating Rate Notes and the 2028 Floating Rate Notes will mature at par on November 3, 2027 and November 3, 2028,
respectively.

The Floating Rate Notes will bear interest at a floating rate, reset quarterly on each Floating Rate Interest Payment Date
(as defined below), equal to Compounded SOFR (as defined below), plus 0.460%, in the case of the 2027 Floating Rate Notes, and 0.540%, in the case of the 2028 Floating Rate Notes. In no event will the interest on the Floating Rate Notes be less than
zero. Interest on the Floating Rate Notes will be payable quarterly in arrears on February 3, May 3, August 3 and November 3 of each year, beginning February 3, 2026, and at the maturity or redemption date (each a
“Floating Rate Interest Payment Date”). With respect to the Floating Rate Notes, an “interest period” means the period from and including a Floating Rate Interest Payment Date (or, in the case of the initial interest period,
from and including the settlement date of the Floating Rate Notes) to, but excluding, the immediately succeeding Floating Rate Interest Payment Date (such succeeding Floating Rate Interest Payment Date, the “Latter Floating Rate Interest
Payment Date”); provided that, if a Floating Rate Interest Payment Date, other than the maturity date or the date of redemption or repayment, falls on a day that is not a business day, the Floating Rate Interest Payment will be postponed to
the next day that is a business day and the Floating Rate Interest Payment Date will be such succeeding business day, and interest thereon will continue to accrue to but excluding such succeeding business day, except that if that business day is in
the next succeeding calendar month, the Floating Rate Interest Payment Date will be the immediately preceding business day and interest shall accrue to but excluding such preceding business day; provided further that the final interest period for
the Floating Rate Notes will be the period from and including the Floating Rate Interest Payment Date immediately preceding