Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 71

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 71
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 may not be offered or sold, directly or indirectly, in Japan or to or for the benefit of any resident of Japan (including any person resident in Japan or any corporation or other entity organized under the laws of Japan) or to others for reoffering or resale, directly or indirectly, in Japan or to or for the benefit of any resident of Japan, except pursuant to an exemption from the registration requirements of the FIEA and otherwise in compliance with any relevant laws and regulations of Japan. S-45

LEGAL MATTERS

The validity of the securities offered hereby will be passed upon for Webster by Davis Polk & Wardwell LLP, New York, New York.
Certain legal matters related to the offering will be passed upon for the underwriters by Cravath, Swaine & Moore LLP, New York, New York.

EXPERTS

The consolidated financial statements of Webster Financial Corporation as of December 31, 2024 and 2023, and for each of the years in the
three year period ended December 31, 2024, and management’s assessment of the effectiveness of internal control over financial reporting as of December 31, 2024, have been incorporated by reference herein in reliance upon the reports
of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

S-46

PROSPECTUS

### WEBSTER FINANCIAL CORPORATION
Debt Securities

Common Stock

Preferred Stock

Depositary Shares

Purchase Contracts

Units

Warrants

Webster Financial Corporation and/or one or more selling securityholders to be identified in the future may offer the securities listed above from time to
time in one or more offerings. When we or any selling securityholders offer securities, you will be provided with a prospectus supplement describing the specific terms of the securities, including the price of the securities. We or any selling
securityholders may offer and sell these securities to or through one or more underwriters, dealers and agents, or directly to purchasers, on a continuous or delayed basis. You should read this prospectus and the applicable prospectus supplement
carefully before you decide to invest. This prospectus may not be used to sell securities unless it is accompanied by a prospectus supplement that further describes the securities being delivered to you.

Our common stock is listed for trading on the New York Stock Exchange under the symbol “WBS.” We will provide information in the prospectus
supplement for the trading market,