Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 122

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 122
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 debt securities apply, and the underwriters will be obligated to purchase all of the debt securities contemplated in an offering if they purchase any of such securities. Any initial public offering price and any discounts or concessions allowed or paid to dealers may be changed from time to time. Dealers If we use dealers in the sale, unless we otherwise indicate in the prospectus supplement, we will sell debt securities to the dealers as principals. The dealers may then resell the debt securities to the public at varying prices that the dealers may determine at the time of resale. Agents and Direct Sales We may sell debt securities directly or through agents that we designate. The prospectus supplement will name any agent involved in the offering and sale and state any commissions we will pay to that agent. Unless we indicate otherwise in the prospectus supplement, any agent is acting on a best efforts basis for the period of its appointment. Contracts with Institutional Investors for Delayed Delivery If we so indicate in the prospectus supplement, we will authorize underwriters, dealers or agents to solicit offers from various institutional investors to purchase debt securities. In this case, payment and delivery will be made on a future date that the prospectus supplement specifies. The underwriters, dealers or agents may impose 38

limitations on the minimum amount that the institutional investor can purchase. They may also impose limitations on the portion of the aggregate amount of the debt securities that they may sell. These institutional investors include:

| • |     | commercial and savings banks; |

| • |     | insurance companies; |

| • |     | pension funds; |

| • |     | investment companies; |

| • |     | educational and charitable institutions; and |

| • |     | other similar institutions as we may approve. |

The obligations of any of these purchasers pursuant to delayed delivery and payment arrangements will not be subject to any conditions. However, one exception applies. An institution’s purchase of the particular debt securities cannot at the time of delivery be prohibited under the laws of any jurisdiction that governs:

| • |     | the validity of the arrangements; or |

| • |     | the performance by us or the institutional investor. |

Indemnification Agreements that we have entered into or may enter into with underwriters, dealers or agents may entitle them to indemnification by us against various civil liabilities. These include liabilities under the Securities Act of 1933, as amended. The agreements may also entitle them to contribution for payments which they may be required to make as a result of these liabilities. Underwriters