Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 62

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 62
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 to the IRS.

FATCA

Provisions commonly referred to as
“FATCA” impose withholding of 30% on payments of interest on the Notes and on payments of gross proceeds of sales or redemptions of the Notes to “foreign financial institutions” (which is broadly defined for this purpose and
in general includes investment vehicles and financial intermediaries) and certain other non-U.S. entities unless various U.S. information reporting and due diligence requirements (generally relating to
ownership by U.S. persons of interests in or accounts with those entities) have been satisfied, or an exemption applies. However, proposed Treasury Regulations (the preamble to which specifies that taxpayers are permitted to rely on them pending
finalization) eliminate the withholding requirement on payments of gross proceeds of a taxable disposition (other than any amount treated as interest). Holders are encouraged to consult with their own tax advisors regarding the possible implications
of FATCA on their investment in the Notes.

The discussion of U.S. federal income tax considerations set forth above is included for
general information only and may not be applicable depending upon a holder’s particular situation. Prospective purchasers of the Notes are urged to consult their own tax advisors with respect to the tax consequences to them of the purchase,
ownership and disposition of Notes, including the tax consequences under state, local, estate, foreign and other tax laws and the possible effects of changes in U.S. or other tax laws.

S-39

UNDERWRITING We have entered into an underwriting agreement, dated September 4, 2025 (the “Underwriting Agreement”), with BofA Securities, Inc., Goldman Sachs & Co. LLC, J.P. Morgan Securities LLC and Morgan Stanley & Co. LLC who are acting as the representatives of each of the several underwriters named below, with respect to the Notes. Subject to certain conditions, the underwriters have agreed to purchase, severally but not jointly, the aggregate principal amount of Notes set forth next to their names in the following table:

| Underwriters               |     | Principal Amount 
 of Notes         |             |
|:---------------------------|:----|:-----------------|------------:|
| BofA Securities, Inc.      |     | $                |  96,250,000 |
| Goldman Sachs & Co. LLC    |     |                  |  78,750,000 |
| J.P. Morgan Securities LLC |     |                  |  78,750,000 |
| Morgan Stanley & Co. LLC