Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 1

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 1
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 for any redemption is 100% of the principal amount of the Notes, plus accrued and unpaid interest thereon to, but excluding, the date of redemption. Any redemption of the Notes prior to the maturity date will be subject to the receipt of the approval of the Board of Governors of the Federal Reserve System (the “Federal Reserve”) (or any successor bank regulatory agency) to the extent then required under the rules of the Federal Reserve. The Notes will be unsecured subordinated obligations, will rank pari passu, or equally, with all of our future unsecured subordinated debt and will be junior to all of our existing and future senior debt. The Notes will be structurally subordinated to all existing and future liabilities of our subsidiaries and will be effectively subordinated to our existing and future secured indebtedness to the extent of the value of the assets securing such indebtedness. There will be no sinking fund for the Notes. The Notes will be obligations of Webster Financial Corporation (“Webster”) only and will not be obligations of, and will not be guaranteed by, any of Webster’s subsidiaries. For a more detailed description of the Notes, see “Description of the Notes.” Prior to this offering, there has been no public market for the Notes. The Notes will not be listed on any securities exchange or included in any automated quotation system. The Notes are not deposits and are not insured by the Federal Deposit Insurance Corporation (the “FDIC”) or any other governmental agency. The Notes are ineligible as collateral for a loan or extension of credit from Webster or any of its subsidiaries. None of the U.S. Securities and Exchange Commission (the “SEC”), the FDIC, the Federal Reserve, any other bank regulatory agency or any state securities commission has approved or disapproved of the Notes or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense. Investing in the Notes involves risks. See “ Risk Factors” beginning on page S-6of this prospectus supplement and those risk factors in the documents incorporated by reference in this prospectus supplement and the accompanying prospectus.

|                                  |     | Per Note |         |   |     | Total |             |
|:---------------------------------|:----|:---------|--------:|:--|:----|:------|------------:|
| Public offering price(1)         |     |          | 100.000 | % |     | $     | 350,000,000 |
| Underwriting discount(