Brenda M. Hall - 24 Aug 2026 Form 4 Insider Report for COMMUNITY FINANCIAL SYSTEM, INC. (CBU)

Reporting relationship: Director
Issuer ticker: CBU
Reported as of: 24 Aug 2026
Net transaction value: +$30,271
SEC form: 4
Accepted by SEC: 26 Aug 2026, 12:07:10 UTC
Prior SEC filing: 18 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Danielle M. Cima, attorney-in-fact for Brenda M. Hall

Key filing fact

Brenda M. Hall filed Form 4 for COMMUNITY FINANCIAL SYSTEM, INC. (CBU) on 26 Aug 2026.

Key facts

This page summarizes Brenda M. Hall's Form 4 filing for COMMUNITY FINANCIAL SYSTEM, INC. (CBU).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 26 Aug 2026, 12:07.

Change

Previous filing in this sequence was filed on 18 Mar 2026.
Current net transaction value: +$30,271.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001891706 Primary reporting owner

Hall Brenda M

Relationship: Director
Address: C/O COMMUNITY FINANCIAL SYSTEM, INC., 333 BUTTERNUT DRIVE, SYRACUSE
Signature: /s/ Danielle M. Cima, attorney-in-fact for Brenda M. Hall
Signature date: 26 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CBU transaction

Common Stock

Purchase

Transaction value: $30,271
Shares: +476
Change %: +1221%
Price: $63.59
Shares after: 515
Date: 24 Aug 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CBU holding Derivative

Phantom Stock (Deferred Stock Units)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 1,229
Date: 24 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,229
Exercise price
Footnotes: F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $63.1899 to $63.5989, inclusive. The reporting person undertakes to provide Community Financial System, Inc., any security holder of Community Financial System, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Footnote F2

The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the "LTIP"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date.

Footnote F3

Includes 8.5864 units of phantom stock acquired as dividend equivalents on July 10, 2026 under the Plan.