Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 16

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 16
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 a resolution either:

| • |     | in a bankruptcy proceeding under Chapter 11 of the U.S. Bankruptcy Code, or |

| • |     | in a receivership administered by the FDIC under Title II of the Dodd-Frank Act. |

On August 29, 2023, the Federal banking agencies issued a notice of proposed rulemaking (the “LTD NPR”), proposing long-term debt (“LTD”) requirements for Category II, III, and IV bank holding companies, which if adopted would require covered bank holding companies to issue and maintain minimum amounts of eligible LTD that satisfies certain requirements similar to those established for GSIBs. The LTD NPR also proposed requiring minimum amounts of internal eligible LTD to be maintained by certain insured depository institutions (“IDIs”) that are not consolidated subsidiaries of U.S. GSIBs and that have at least $100 billion in consolidated assets, for purposes of absorbing losses or recapitalizing the IDI. While we are not currently a Category II, III, or IV bank holding company or subject to the eligible LTD requirements applicable to GSIBs, if final rules are adopted pursuant to the LTD NPR, we may become subject to the requirements of such rules at that time or shortly thereafter. S-8

We intend to qualify the Notes being offered hereby as eligible LTD for purposes of the
Federal Reserve’s total loss-absorbing capacity rules as currently in effect and the final rules, if any, adopted pursuant to the LTD NPR. Because we do not and cannot know what final rules, if any, will be adopted pursuant to the LTD NPR, it
is possible that the Notes do not qualify as eligible LTD under any final rule. As a result, we may need to issue further debt that is designed to qualify as eligible LTD in the future.

Because we intend for the Notes to qualify as eligible LTD for purposes of the Federal Reserve’s total loss-absorbing capacity rules,
payment of principal on the Notes may be accelerated only in the case of certain events of our bankruptcy or insolvency.

There is no
automatic acceleration, or right of acceleration, in the case of default in the payment of principal of or interest on the Notes, or in the performance of any of our other obligations under the Notes or the Indenture governing the Notes. Our
regulators can, in the event we or the Bank become subject to an enforcement action, prohibit the Bank from paying dividends to us, and prevent our payment of interest or principal on the Notes and any dividends on our capital stock