Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 3

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 3
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 the accompanying prospectus, you should rely on the information set forth in this prospectus supplement.

Neither we nor the underwriters have authorized anyone to provide you with any information other than that contained or incorporated by
reference in this prospectus supplement, the accompanying prospectus and any “free writing prospectus” prepared by or on behalf of us or to which we may have referred you. We take no responsibility for, and can provide no assurance as to
the reliability of, any other information that others may give you. We are not, and the underwriters are not, making an offer to sell the Notes in any jurisdiction where the offer or sale is not permitted. You should assume that the information
appearing in this prospectus supplement, the accompanying prospectus, any free writing prospectus relating to this prospectus supplement provided or approved by us and the documents incorporated by reference in either this prospectus supplement or
the accompanying prospectus is accurate only as of the respective dates of those documents. Our business, financial condition, results of operations and prospects may have changed since those dates.

Before you invest in the Notes, you should carefully read the registration statement (including the exhibits thereto) of which this prospectus
supplement and the accompanying prospectus form a part, this prospectus supplement, the accompanying prospectus and the documents incorporated by reference into this prospectus supplement and the accompanying prospectus. The incorporated documents
are described under “Where You Can Find More Information.”

ii

WHERE YOU CAN FIND MORE INFORMATION We file annual, quarterly and current reports, proxy statements and other information with the Securities and Exchange Commission (the “SEC”). Our reports filed electronically with the SEC are available to the public over the Internet at the SEC’s website at http://www.sec.gov. We make available at no cost all of our reports filed electronically with the SEC through the investor relations page of our website at www.websterbank.com. Except for those SEC filings incorporated by reference in this prospectus supplement or the accompanying prospectus, none of the other information on our website is part of this prospectus supplement or the accompanying prospectus or incorporated by reference herein or therein. You may request a copy of these filings, other than an exhibit to a filing (unless that exhibit is specifically incorporated by reference into that filing), at no cost. Requests should be sent to Webster Financial Corporation, 200 Elm Street, Stamford, Connecticut 06902, (203) 578-2202,Attention: Emlen Harmon, Senior Managing Director, Investor Relations. The