Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 95

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 95
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 any scission or any apport partiel d’actifs under French law)) where the entity resulting from or surviving following such amalgamation, reorganization, merger, consolidation or restructuring or other                   
 similar arrangement, assumes or owes the obligation resulting from the debt securities of the series; or                                                                                                                                        |

| • |     | any other event of default described in the prospectus supplement occurs. (Section 501) |

19

For the purpose of this section, “Principal Subsidiary” means at any relevant time any Subsidiary the accounts of which are consolidated with those of the Issuer and which, together with its own Subsidiaries, accounts for at least 15 percent of the net consolidated annual sales of the Issuer as disclosed from time to time in our latest publicly issued consolidated annual financial statements. “Subsidiary” means, in relation to any person or entity at any time, any other person or entity (whether or not now existing) meeting the definition of Article L. 233-1of the French Commercial Code or any other person or entity controlled directly or indirectly by such person or entity within the meaning of Article L. 233-3of the French Commercial Code. These articles:

| • |     | define a subsidiary as an entity for which a majority of the share capital is owned by another entity (Article L. 
 233-1 of the French Commercial Code); and                                                                         |

| • |     | provide a list of the circumstances under which an entity is considered to control another ((i) direct or                                                                                                                                                                            
 indirect holding of majority voting rights of an entity; (ii) majority voting rights of an entity by virtue of an agreement with other shareholders that is not contrary to the interests of the entity; (iii) the ability, given voting                                             
 rights, to determine whether resolutions are adopted at general shareholder meetings of an entity; (iv) shareholding combined with the ability to appoint or to revoke the majority of the members of the board of directors, the supervisory board                                  
 or other administrative body of the entity. An entity is also deemed to exert control over another entity if it directly or indirectly holds more than 40% of the voting rights of the other entity and no other shareholder holds a greater                                         
 shareholding. In addition, two or more entities acting in concert are considered as jointly controlling another when they are able to determine whether resolutions are adopted at general shareholder meetings of another entity) (Article L. 233-3 of the French Commercial Code).