Company: WBS-PG
Filing Date: 2025-04-11
Form Type: DEFA14A
Source: 0000801337-25-000016
Chunk: 0

Company: WEBSTER FINANCIAL CORP
Filing Date: 2025-04-11
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A
<div align='center'>(RULE 14A-101)</div>

### INFORMATION REQUIRED IN PROXY STATEMENT

#### SCHEDULE 14A INFORMATION

#### Proxy Statement Pursuant to Section 14(a) of the

#### Securities Exchange Act of 1934
<div align='center'>(Amendment No. )</div>

Filed by the Registrant x

Filed by a Party other than the Registrant o

Check the appropriate box:

o Preliminary Proxy Statement

o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

o Definitive Proxy Statement

x Definitive Additional Materials

o Soliciting Material Under §240.14a-12

### Webster Financial Corporation
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

x No fee required

o Fee paid previously with preliminary materials.

o Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

200 ELM STREET
STAMFORD, CT 06902

V62251-P24637-Z89253

You invested in WEBSTER FINANCIAL CORPORATION and it’s time to vote!

You have the right to vote on proposals being presented at the Annual Meeting of Stockholders being held on May 21, 2025 (the “Annual Meeting”). This is an important notice regarding the availability of proxy materials for the Annual Meeting.

Get informed before you vote

View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 7, 2025. If you would like to request a copy of the material(s) for this and/or future stockholders’ meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

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