Company: WBS-PG
Filing Date: 2025-09-05
Form Type: 424B5
Source: 0001193125-25-197211
Chunk: 117

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-09-05
Form: 424B5
Chunk 117
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 contracts, or prepaid securities, when we transfer to a holder any collateral securing the holder’s obligations under the
original purchase contract.

The purchase contracts may be issued separately or as part of units consisting of a purchase contract and one or more other
securities, which may include debt securities, depositary shares, preferred securities, common stock, warrants or debt obligations of Webster, or government securities, and which may secure the holder’s obligations to purchase the purchase
contract security under the purchase contract.

The prospectus supplement relating to any purchase contracts we are offering will specify the material
terms of the purchase contracts, whether they will be issued separately or as part of units, and any applicable pledge or depository arrangements.

The
descriptions of the purchase contracts and any applicable underlying security or pledge or depository arrangements in this prospectus and in any prospectus supplement are summaries of certain material provisions of the applicable agreements. These
descriptions do not restate those agreements in their entirety and do not contain all of the information that you may find useful or that may be important to you. You should refer to the provisions of the applicable agreements because they, and not
the summaries, define your rights as holders of the purchase contracts. We will make copies of the relevant agreements available as described under the heading “Where You Can Find More Information” above.

36

DESCRIPTION OF UNITS As specified in the applicable prospectus supplement, we may issue units comprised of one or more of the other securities described in this prospectus in any combination. Each unit may also include debt obligations of third parties, such as U.S. Treasury securities. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations of a holder of each included security. The prospectus supplement will describe:

| • |     | the designation and terms of the units and of the securities comprising the units, including whether and under 
 what circumstances the securities comprising the units may be held or transferred separately;                  |

| • |     | a description of the terms of any unit agreement governing the units; |

| • |     | a description of the provisions for the payment, settlement, transfer or exchange of the units; and |

| • |     | whether the units will be issued in fully registered or global form. |

The descriptions of the units and any applicable underlying security or pledge or depository arrangements in this prospectus and in any prospectus supplement are summaries of the