Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 66

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 66
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 registration requirements of the FIEA and otherwise in compliance with any
relevant laws and regulations of Japan.

S-47

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, any notes, except                                                                                                            
 for notes which are a “structured product” as defined in the Securities and Futures Ordinance (Cap. 571) of Hong Kong (the “SFO”), other than: (i) to “professional investors” as defined in the SFO) and any              
 rules made under the SFO; or (ii) in other circumstances which do not result in the document being a “Prospectus” as defined in the Companies Ordinance (Cap. 32) of Hong Kong (the “Companies Ordinance”) or which do not 
 constitute an offer to the public within the meaning of the Companies Ordinance; and                                                                                                                                       |

| • |     | it has not issued or had in its possession for the purposes of issue, and will not issue or have in its                                                                                                                                                
 possession for the purposes of issue, whether in Hong Kong or elsewhere, any advertisement, invitation or document relating to the notes, which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong 
 (except if permitted to do so under the securities laws of Hong Kong) other than with respect to the notes which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” as defined in             
 the SFO and any rules made under the SFO.                                                                                                                                                                                                              |

Singapore This prospectus supplement and the attached prospectus have not been registered as a prospectus with the Monetary Authority of Singapore under the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”). Accordingly, each underwriter severally represents, warrants and agrees that it has not offered or sold and that it will not offer or sell any notes or cause such notes to be made the subject of an invitation for subscription or purchase, nor will it circulate or distribute this prospectus supplement and the attached prospectus or any other document or material in connection with the offer or sale or invitation for subscription or purchase of the notes, whether directly or indirectly, to any person in Singapore other than:

| • |     | to an institutional investor pursuant to Section 274 of the SFA; |

| • |     | to a relevant