Company: CAG
Filing Date: 2025-07-16
Form Type: 424B5
Source: 0001104659-25-068390
Chunk: 2

Company: CONAGRA BRANDS INC.
Filing Date: 2025-07-16
Form: 424B5
Chunk 2
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 which is the fifth business day following the date of this prospectus supplement (such settlement being referred to as “T+5”). Investing in the notes involves risks that are described or referred to in the “Risk Factors” section beginning on page S-6of this prospectus supplement. The underwriters expect to deliver the notes to purchasers through the book-entry delivery system of The Depository Trust Company (“DTC”) for the benefit of its participants, including Euroclear Bank SA/NV (“Euroclear”) and Clearstream Banking S.A. (“Clearstream”) on or about July 22, 2025, which is the fifth business day following the date of this prospectus supplement. Purchasers of the notes should note that trading of the notes may be affected by this settlement date. See “Underwriting (Conflicts of Interest)” beginning on page S-31of this prospectus supplement. Joint Book-Running Managers

| ​ | BofA Securities | ​ | ​ | Goldman Sachs & Co. LLC | ​ | ​ | Mizuho | ​ | ​ | Wells Fargo Securities | ​ |

Senior Co-Manager US Bancorp Co-Managers

| ​ | BMO Capital Markets | ​ | ​ | PNC Capital Markets LLC | ​ | ​ | Rabo Securities | ​ | ​ | Truist Securities | ​ |
| ​ | HSBC                | ​ | ​ | ​                       | ​ | ​ | ​               | ​ | ​ | Scotiabank        | ​ |

The date of this prospectus supplement is July 15, 2025.

TABLE OF CONTENTS

TABLE OF CONTENTS Prospectus Supplement

| ​                                                             | ​ | ​ | Page |   |       |   | ​ |
| About This Prospectus Supplement                              | ​ | ​ | ​    | ​ | S-ii  | ​ | ​ |
| Where You Can Find More Information                           | ​ | ​ | ​    | ​ | S-ii  | ​ | ​ |
| Information We Incorporate by Reference                       | ​ | ​ | ​    | ​ | S-ii  | ​ | ​ |
| Notice to Prospective Investors in the European Economic Area | ​ | ​ | ​    | ​ | S-iii | ​ | ​ |
| Notice to Prospective Investors in the United Kingdom         | ​ | ​ | ​    | ​ | S-iii | ​ | ​ |
| Disclosure Regarding Forward-Looking Statements               | ​ | ​ | ​    | ​ | S-v   |