Company: SNY
Filing Date: 2025-10-29
Form Type: 424B5
Source: 0001193125-25-255563
Chunk: 69

Company: Sanofi
Filing Date: 2025-10-29
Form: 424B5
Chunk 69
---
 or (ii) investment professionals falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the
“Order”) or (iii) high net worth companies, and other persons to whom it may lawfully be communicated, falling within Article 49(2)(a) to (d) of the Order (all such persons together being referred to as “relevant
persons”). The notes are only available to, and any invitation, offer or agreement to subscribe, purchase or otherwise acquire such notes will be engaged in only with, relevant persons. Any person who is not a relevant person should not act or
rely on this document or any of its contents.

In the Underwriting Agreement, each Underwriter severally represents, warrants and agrees
that it and its respective affiliates and any other person acting on its or their behalf: (i) has or have only communicated or caused to be communicated and will only communicate or cause to be communicated an invitation or inducement to engage
in investment activity (within the meaning of Section 21 of the FSMA) received by it or them in connection with the issue or sale of any notes which are the subject of the offering contemplated by the prospectus supplement in circumstances in
which Section 21(1) of the FSMA does not apply to the Company; and (ii) has or have complied and will comply with all applicable provisions of FSMA with respect to anything done by it in relation to the notes in, from or otherwise
involving the United Kingdom.

Japan

The notes have not been and will not be registered under the Financial Instruments and Exchange Act of Japan (Act No. 25 of 1948, as
amended), or the FIEA. The notes may not be offered or sold, directly or indirectly, in Japan or to or for the benefit of any resident of Japan (including any person resident in Japan or any corporation or other entity organized under the laws of
Japan) or to others for reoffering or resale, directly or indirectly, in Japan or to or for the benefit of any resident of Japan, except pursuant to an exemption from the registration requirements of the FIEA and otherwise in compliance with any
relevant laws and regulations of Japan.

S-46

Hong Kong Each underwriter severally represents, warrants and agrees that:

| • |     | it has not offered or sold and will not offer or sell in Hong Kong, by means of any document,