Company: SNY
Filing Date: 2025-10-29
Form Type: 424B5
Source: 0001193125-25-255563
Chunk: 63

Company: Sanofi
Filing Date: 2025-10-29
Form: 424B5
Chunk 63
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 MUFG Securities Americas Inc.   |     | $              |  56,250,000 |     | $              |  56,250,000 |     | $              |  45,000,000 |     | $              |  45,000,000 |     | $              |   135,000,000 |
| Natixis Securities Americas LLC |     | $              |  56,250,000 |     | $              |  56,250,000 |     | $              |  45,000,000 |     | $              |  45,000,000 |     | $              |   135,000,000 |
| Total                           |     | $              | 500,000,000 |     | $              | 500,000,000 |     | $              | 400,000,000 |     | $              | 400,000,000 |     | $              | 1,200,000,000 |

The underwriting agreement provides that the obligations of the underwriters to purchase the notes included in this offering are subject to certain conditions. The underwriters are obligated to purchase all the notes if they purchase any of the notes. The underwriting agreement also provides that if an underwriter defaults, the purchase commitments of non-defaultingunderwriters may be increased or the offering may be terminated. The underwriters are offering the notes, subject to prior sale, when, as and if issued to and accepted by them, subject to approval of legal matters by their counsel, including the validity of the notes, and other conditions contained in the purchase agreement, such as the receipt by the underwriters of officer’s certificates and legal opinions. The underwriters reserve the right to withdraw, cancel or modify offers and to reject orders in whole or in part. The representatives have advised us that the underwriters propose initially to offer the notes to the public at the public offering price set forth on the cover page of this prospectus supplement and may offer notes to certain dealers at such price less a concession not in excess of 0.100% of the principal amount of the 2027 floating rate notes, 0.150% of the principal amount of the 2028 floating rate notes, 0.100% of the principal amount of the 2027 fixed rate notes, 0.150% of the principal amount of the 2028 fixed rate notes and 0.200% of the principal amount of the