Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 2

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 2
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 Statements |     |      |  3 |
| Webster Financial Corporation                     |     |      |  5 |
| Risk Factors                                      |     |      |  6 |
| Use of Proceeds                                   |     |      |  7 |
| Description of Debt Securities                    |     |      |  8 |
| Description of Common Stock                       |     |      | 23 |
| Description of Preferred Stock                    |     |      | 26 |
| Description of Depositary Shares                  |     |      | 31 |
| Description of Warrants                           |     |      | 34 |
| Description of Purchase Contracts                 |     |      | 36 |
| Description of Units                              |     |      | 37 |
| Plan of Distribution                              |     |      | 38 |
| Legal Matters                                     |     |      | 41 |
| Experts                                           |     |      | 41 |

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ABOUT THIS PROSPECTUS SUPPLEMENT

Unless the context indicates otherwise, the terms “Webster,” “Company,” “we,” “our” and
“us” in this prospectus supplement and the accompanying prospectus refer to Webster Financial Corporation and its consolidated subsidiaries.

References to the “Bank” mean Webster Bank, National Association. References to a particular year mean our fiscal year commencing
on January 1 and ending on December 31 of that year.

This prospectus supplement and the accompanying prospectus incorporate by
reference important business and financial information about us that is not included in or delivered with this document. This information, other than exhibits to documents that are not specifically incorporated by reference into this prospectus
supplement or the accompanying prospectus, is available to you without charge upon written or oral request to Webster at the address or telephone number indicated in the section entitled “Where You Can Find More Information” in this
prospectus supplement.

This document contains two parts. The first part is this prospectus supplement, which contains specific
information about us and the terms on which we are selling the Notes and adds to and updates information contained in the accompanying prospectus and the documents incorporated by reference herein. The second part is the accompanying prospectus
dated December 14, 2023, which contains and incorporates by reference a more general description of the securities we may offer from time to time, some of which does not apply to the Notes we are offering, and important business and financial
information about us. If information contained in this prospectus supplement differs or varies from the information contained in