Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 11

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 11
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. Federal Income Tax Considerations.” |

| Governing Law | The Notes and the Indenture will be governed by the laws of the State of New York. |

| Trustee | U.S. Bank Trust Company, National Association |

| Risk Factors | Investing in the Notes involves risks. Potential investors are urged to read and consider the risk factors relating to an investment in the Notes set forth under “Risk Factors” beginning on page            
 S-6 of this prospectus supplement, as well as the risk factors and other information included or incorporated by reference in this prospectus supplement and the accompanying prospectus, for a discussion of 
 factors that you should carefully consider before deciding whether to invest in the Notes.                                                                                                                    |

S-5

RISK FACTORS

An investment in our securities is subject to risks inherent to our business. Before making an investment decision, you should carefully consider the risks and uncertainties described below together with the risk factors and other information included in our Annual Report on Form 10-Kfor the year ended December31, 2024, our Quarterly Report on Form 10-Qfor the quarter ended March31, 2025, our Quarterly Report on Form 10-Qfor the quarter ended June30, 2025and in other documents that we subsequently file with the SEC, all of which are incorporated by reference into this prospectus supplement and the accompanying prospectus. Additional risks and uncertainties that management is not aware of or that management currently deems immaterial may also impair our business operations. See also the discussion under the heading “Special Note Concerning Forward-Looking Statements.” This prospectus supplement and the accompanying prospectus are qualified in their entirety by these risk factors. If any of these risks actually occurs, our financial condition and results of operations could be materially and adversely affected. If this were to happen, the value of our securities could decline significantly, and you could lose all or part of your investment.

Risk Factors Related to the Notes

The Notes will be unsecured and subordinated to any existing and future senior indebtedness.

The Notes will be subordinated obligations of Webster. Accordingly, they will be junior in right of payment to all existing and future senior
indebtedness and, in certain events of insolvency, to other financial obligations as described under “Description of the Notes.” Our senior indebtedness includes all indebtedness, except indebtedness that is expressly subordinated to or
expressly ranks pari passuwith the Notes, subject to certain exceptions. As of June 30, 2025