Michele Sullivan - 18 Jun 2026 Form 4 Insider Report for COMMUNITY FINANCIAL SYSTEM, INC. (CBU)

Reporting relationship: Director
Issuer ticker: CBU
Reported as of: 18 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 18 Jun 2026, 15:53:50 UTC
Prior SEC filing: 19 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Danielle M. Cima, pursuant to Confirming Statement executed by Michele Sullivan

Key filing fact

Michele Sullivan filed Form 4 for COMMUNITY FINANCIAL SYSTEM, INC. (CBU) on 18 Jun 2026.

Key facts

This page summarizes Michele Sullivan's Form 4 filing for COMMUNITY FINANCIAL SYSTEM, INC. (CBU).
1 reported transaction and 2 derivative rows are listed below.
Accepted by SEC: 18 Jun 2026, 15:53.

Change

Previous filing in this sequence was filed on 19 Mar 2026.
Current net transaction value: $0.

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 0002009605 Primary reporting owner

Sullivan Michele

Relationship: Director
Address: C/O COMMUNITY FINANCIAL SYSTEM, INC., 333 BUTTERNUT DRIVE, SYRACUSE
Signature: /s/ Danielle M. Cima, pursuant to Confirming Statement executed by Michele Sullivan
Signature date: 18 Jun 2026

Reported derivative securities

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

CBU transaction Derivative

Deferred Stock (Deferred Compensation)

Award

Transaction value
Shares: +406
Change %: +11%
Price: $61.24^*
Shares after: 3,960
Date: 18 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 406
Exercise price
Footnotes: F3, F4

CBU holding Derivative

Phantom Stock (Deferred Stock Units)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 3,973
Date: 18 Jun 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,973
Exercise price
Footnotes: F1, F2

^* 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

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 F2

Includes 20.5647 units of phantom stock acquired as dividend equivalents on April 10, 2026 under the LTIP.

Footnote F3

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 for Directors (the "DCP for Directors"), will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person.

Footnote F4

Includes 23.2041 units of phantom stock acquired as dividend equivalents on April 10, 2026 under the DCP for Directors.