Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 7

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 7
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 prospectus supplement and the accompanying prospectus. You should carefully consider, among other things, the matters discussed in the sections titled “Risk Factors” in this prospectus supplement, the accompanying prospectus, our Annual Report on Form 10-Kfor the year ended December31, 2024, our Quarterly Report on Form 10-Qfor the quarter ended March31, 2025and our Quarterly Report on Form 10-Qfor the quarter ended June30, 2025. In addition, certain statements include forward-looking information that involves risks and uncertainties. See “Special Note Concerning Forward-Looking Statements” in this prospectus supplement.

Overview

Webster Financial Corporation
is a bank holding company and financial holding company under the BHC Act, incorporated under the laws of Delaware in 1986, and headquartered in Stamford, Connecticut. As of June 30, 2025, Webster Financial Corporation had approximately
$82 billion in total consolidated assets.

Webster Bank is a commercial bank with a national bank charter focused on providing
financial products and services to businesses, individuals and families. While its core footprint spans the Northeast from the New York metropolitan area to Rhode Island and Massachusetts, certain businesses operate in extended geographies. Webster
Bank offers three differentiated lines of business: Commercial Banking, Healthcare Financial Services and Consumer Banking.

Corporate Information

Our principal executive offices are located at 200 Elm Street, Stamford, Connecticut 06902. Our telephone number is (203) 578-2202 and our website is www.websterbank.com. The information on our website is not part of this prospectus supplement.

S-1

THE OFFERING The following summary highlights selected information from this prospectus supplement and the accompanying prospectus about the Notes and this offering. This description is not complete and does not contain all of the information that you should consider before investing in the Notes. You should read this prospectus supplement and the accompanying prospectus, as well as the documents incorporated by reference or deemed to be incorporated by reference herein and therein, carefully before making a decision about whether to invest in the Notes. For a more complete understanding of the Notes, you should read “Description of the Notes.”

| Issuer | Webster Financial Corporation, a Delaware corporation and a bank holding company and financial holding company. |

| Notes Offered | 5.784% Fixed Rate Reset Subordinated Notes due 2035. |

| Aggregate Principal Amount | $350,000,000 |

| Issue Price | 100.000% |

| Reset Determination