Statement of Changes in Beneficial Ownership (Form 4)

Ownership Submission

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Bolus Mark J. 2. Issuer Name and Ticker or Trading Symbol COMMUNITY FINANCIAL SYSTEM, INC. [CBU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O COMMUNITY FINANCIAL SYSTEM, INC., 5790 WIDEWATERS PARKWAY 3. Date of Earliest Transaction (Month/Day/Year) 01/15/2025 (Street) DEWITT, NY 13214 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 01/15/2025 M 712 A $ 0 (1) 101,769.069(2) D Common Stock 5,705.947(3) I By Austin Bolus Trust Common Stock 7,812.038(4) I By Mark Bolus Trust Common Stock 5,705.947(3) I By Noah Bolus Trust Common Stock 5,705.947(3) I By Paige Bolus Trust Common Stock 5,705.947(3) I By Taylor Bolus Trust

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Phantom Stock (Deferred Stock Units)

(5)

01/15/2025

M

712

(5)

(5)

Common Stock

712

$ 0

2,672.7862(6)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
Director	10% Owner	Officer	Other
Bolus Mark J. C/O COMMUNITY FINANCIAL SYSTEM, INC. 5790 WIDEWATERS PARKWAY DEWITT, NY 13214	X

Signatures

/s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Mark J. Bolus	01/17/2025
**Signature of Reporting Person	Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	On January 15, 2025, the reporting person's deferred stock units were settled for 712 shares of Community Financial System, Inc. common stock, and .0872 shares were settled in cash at the price of $61.60 per share.
(2)	Includes 2,129.519 shares acquired pursuant to the Community Financial System, Inc. Dividend Reinvestment Plan.
(3)	Includes 154.057 shares acquired pursuant to the Community Financial System, Inc. Dividend Reinvestment Plan.
(4)	Includes 210.808 shares acquired pursuant to the Community Financial System, Inc. Dividend Reinvestment Plan.
(5)	The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the "Plan"). 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.
(6)	Includes 103.1993 units of phantom stock acquired as dividend equivalents under the Plan.

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