Neil E. Fesette - 18 Sep 2025 Form 4 Insider Report for COMMUNITY FINANCIAL SYSTEM, INC. (CBU)

Role: Director
Signature: /s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Neil E. Fesette
Issuer symbol: CBU
Transactions as of: 18 Sep 2025
Net transactions value: +$11,500
Form type: 4
Filing time: 22 Sep 2025, 11:30:17 UTC
Previous filing: 24 Jun 2025
Next filing: 19 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Fesette Neil E.	Director	C/O COMMUNITY FINANCIAL SYSTEM, INC., 5790 WIDEWATERS PARKWAY, DEWITT	/s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Neil E. Fesette	22 Sep 2025	0001485738

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CBU	Phantom Stock (Deferred Compensation)	Award	$11,500	+192	+2.7%	$59.75	7,382	18 Sep 2025	Common Stock	192		Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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 will be settled in Community Financial System, Inc. common stock at future dates selected by the reporting person.