Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 75

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 75
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 to whom a prospectus (or a notice of registration in lieu thereof) is delivered a copy of any of these filings (other than an exhibit to these filings, unless the exhibit is specifically incorporated by reference as an exhibit to this prospectus) at no cost, upon a request to us by writing or telephoning us at the following address or telephone number: Webster Financial Corporation 200 Elm Street Stamford, Connecticut 06902 (203) 578-2202 Attention: Emlen Harmon, Senior Managing Director, Investor Relations 2

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS This prospectus and the information included or incorporated by reference in it contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by words such as “believes,” “anticipates,” “expects,” “intends,” “targeted,” “continue,” “remain,” “will,” “should,” “may,” “plans,” “estimates” and similar references to future periods; however, such words are not the exclusive means of identifying such statements. Examples of forward-looking statements include, but are not limited to:

| • |     | projections of revenues, expenses, income or loss, earnings or loss per share, and other financial items; |

| • |     | statements of plans, objectives, and expectations of Webster or its management or Board of Directors; |

| • |     | statements of future economic performance; and |

| • |     | statements of assumptions underlying such statements. |

Forward-looking statements are based on Webster’s current expectations and assumptions regarding its business, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Webster’s actual results may differ materially from those contemplated by the forward-looking statements, which are neither statements of historical fact nor guarantees or assurances of future performance. Factors that could cause our actual results to differ materially from those discussed in any forward-looking statements include, but are not limited to:

| • |     | our ability to successfully execute our business plan and strategic initiatives, and manage any risks or 
 uncertainties;                                                                                           |

| • |     | any continuation of the recent turmoil in the banking industry, including the associated impact of any regulatory 
 changes or other mitigation efforts taken by government agencies in response;                                     |

| • |     | volatility in Webster’s stock price due to investor sentiment, including in light of