Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 72

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 72
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 if any, for any other securities we or selling securityholders may offer.

Investing in our securities involves risks. You should carefully review and consider the risk factors incorporated by reference into this prospectus, as well as any additional risk factors included in, or incorporated by reference into, the applicable prospectus supplement before buying any of our securities. See “ Risk Factors” on page 6 of this prospectus.

None of the Securities and Exchange Commission, any state securities commission, or any other regulatory body has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The offered securities are not savings accounts, deposits, or other obligations of any bank or non-banksubsidiary of ours. The securities are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency or instrumentality and are subject to investment risks.

The date of this prospectus is December 14, 2023.

TABLE OF CONTENTS

| ABOUT THIS PROSPECTUS                             |     |  1 |
| WHERE YOU CAN FIND MORE INFORMATION               |     |  1 |
| SPECIAL NOTE REGARDING FORWARD-LOOKING 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 |

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission (the “SEC”) using a
“shelf” registration process. Under this shelf registration statement, we may from time to time sell, either separately or together, common stock, preferred stock, debt securities, depositary shares, purchase contracts, units and
warrants described in this prospectus in one or more offerings.

This