Company: SNY
Filing Date: 2025-10-29
Form Type: 424B5
Source: 0001193125-25-255563
Chunk: 45

Company: Sanofi
Filing Date: 2025-10-29
Form: 424B5
Chunk 45
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 the case of the 2028 Fixed Rate Notes; and (ii) 0.100% (or 10 basis points), in the case of the 2032 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, S-31

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 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 Fixed Rate Notes being redeemed plus accrued and unpaid interest thereon to the relevant redemption date.

The Issuer may redeem the 2027 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 0.050% (or 5 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).

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Issuer in accordance with the following
two paragraphs.

The Treasury Rate shall be determined by the Issuer after 4:15 p.m., New York City time (or after such time as yields on
U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such
day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily) — H.15” (or any successor designation or publication) (“H