Company: CI
Filing Date: 2025-09-02
Form Type: 424B5
Source: 0001140361-25-033574
Chunk: 1

Company: Cigna Group
Filing Date: 2025-09-02
Form: 424B5
Chunk 1
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 any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense. The underwriters expect to deliver the Notes in book-entry form only through the facilities of The Depository Trust Company, against payment in New York, New York on or about September , 2025. Joint Book-Running Managers

| BofA Securities |     | Citigroup |     | HSBC |     | Morgan Stanley |

, 2025

#### TABLE OF CONTENTS
Neither we nor the underwriters have authorized any other person to provide you with different or additional information other than that contained in or incorporated by reference in this prospectus supplement and the accompanying prospectus and in any related free writing prospectus filed by the Company with the Securities and Exchange Commission (the “SEC”). We and the underwriters take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may provide. This prospectus supplement and the accompanying prospectus may only be used where it is legal to sell these securities. The information in this prospectus supplement and the accompanying prospectus may only be accurate as of the date of this prospectus supplement, the accompanying prospectus or the information incorporated by reference herein or therein, and the information in any free writing prospectus may only be accurate as of the date of such free writing prospectus. Our business, financial condition, results of operations and/or prospects may have changed since those dates.

TABLE OF CONTENTS

TABLE OF CONTENTS Prospectus Supplement

|                                                                       |     | Page  |
| Cautionary Note Regarding Forward-Looking Statements and Risk Factors |     | S-ii  |
| Where You Can Find More Information                                   |     | S-iii |
| Incorporation of Certain Information by Reference                     |     | S-iv  |
| Summary                                                               |     | S-1   |
| Selected Financial Information                                        |     | S-5   |
| Use of Proceeds                                                       |     | S-6   |
| Capitalization                                                        |     | S-7   |
| Description of the Notes                                              |     | S-8   |
| Material United States Federal Income Tax Consequences                |     | S-17  |
| Certain ERISA Considerations                                          |     | S-20  |
| Underwriting (Conflicts of Interest)                                  |     | S-22  |
| Validity of the Notes                                                 |     |