John A. Vaccaro - 27 Aug 2026 Form 4 Insider Report for COMMUNITY FINANCIAL SYSTEM, INC. (CBU)

Reporting relationship: Director
Issuer ticker: CBU
Reported as of: 27 Aug 2026
Net transaction value: +$20,006
SEC form: 4
Accepted by SEC: 28 Aug 2026, 16:26:42 UTC
Prior SEC filing: 18 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Danielle M. Cima, attorney-in-fact for John A. Vaccaro

Key filing fact

John A. Vaccaro filed Form 4 for COMMUNITY FINANCIAL SYSTEM, INC. (CBU) on 28 Aug 2026.

Key facts

This page summarizes John A. Vaccaro's Form 4 filing for COMMUNITY FINANCIAL SYSTEM, INC. (CBU).
1 reported transaction and 2 derivative rows are listed below.
Accepted by SEC: 28 Aug 2026, 16:26.

Change

Previous filing in this sequence was filed on 18 Jun 2026.
Current net transaction value: +$20,006.

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 0002090100 Primary reporting owner

Vaccaro John A

Relationship: Director
Address: C/O COMMUNITY FINANCIAL SYSTEM, INC., 333 BUTTERNUT DRIVE, SYRACUSE
Signature: /s/ Danielle M. Cima, attorney-in-fact for John A. Vaccaro
Signature date: 28 Aug 2026

Reported non-derivative transactions

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

CBU transaction

Common Stock

Purchase

Transaction value: $20,006
Shares: +317
Change %: +181%
Price: $63.11
Shares after: 492
Date: 27 Aug 2026
Ownership: Direct

Reported derivative securities

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

CBU holding Derivative

Deferred Stock (Deferred Compensation)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 637
Date: 27 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 637
Exercise price
Footnotes: F1, F2

CBU holding Derivative

Phantom Stock (Deferred Stock Units)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 1,229
Date: 27 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,229
Exercise price
Footnotes: F3, F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Each unit of phantom stock is the economic equivalent of one share of Community Financial System, Inc. common stock. The units of phantom stock relating to the Deferred Compensation Plan ("DCP for Directors") will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person.

Footnote F2

Includes 2.2149 units of phantom stock acquired as dividend equivalents on July 10, 2026 under the DCP for Directors.

Footnote F3

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 F4

Includes 8.5864 units of phantom stock acquired on July 10, 2026 under the LTIP's dividend reinvestment feature.