[Form 4] COMMUNITY FINANCIAL SYSTEM, INC. Insider Trading Activity

Rhea-AI Filing Summary

Durkee Deresa Fischer reported acquisition or exercise transactions in this Form 4 filing.

Community Financial System, Inc. reported that SVP and Chief Accounting Officer Deresa Fischer Durkee received a grant of 1,812 restricted stock units on Community Financial common stock. Each unit represents a right to one share and vests in three equal installments beginning on March 1, 2027.

After this award, the filing shows 5,180.604 common shares held directly, 218 shares held indirectly by a spouse, and 654.8825 shares held indirectly through the company’s 401(k) plan, as reflected in a current plan statement.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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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 for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Durkee Deresa Fischer

(Last) (First) (Middle)

C/O COMMUNITY FINANCIAL SYSTEM, INC.

333 BUTTERNUT DRIVE

(Street)

SYRACUSE NEW YORK 13214

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
COMMUNITY FINANCIAL SYSTEM, INC. [ CBU ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, Chief Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/17/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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								5,180.604	D
Common Stock								218	I	By spouse
Common Stock								654.8825(1)	I	By 401(k)

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 Securities Underlying Derivative Security (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: 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
Restricted Stock Units	(2)	03/17/2026		A		1,812		(3)	(3)	Common Stock	1,812	$0	1,812	D

Explanation of Responses:

1. The number of shares reported herein acquired pursuant to Community Financial System, Inc.'s 401(k) Plan and are based on a current plan statement.

2. Each restricted stock unit represents a contingent right to receive one share of Community Financial System, Inc. common stock

3. The restricted stock units vest in three equal installments beginning March 1, 2027.

	/s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Deresa F. Durkee	03/19/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did CBU report for Deresa Fischer Durkee?

Community Financial System reported that SVP and Chief Accounting Officer Deresa Fischer Durkee received 1,812 restricted stock units. The award is a stock-based compensation grant rather than an open-market share purchase or sale, and each unit represents a contingent right to one share of common stock.

How do the new restricted stock units for CBU’s CAO vest?

The 1,812 restricted stock units granted to Community Financial’s Chief Accounting Officer vest in three equal installments beginning March 1, 2027. This means the award is spread over time, aligning the executive’s compensation with longer-term company performance and encouraging retention over the multi-year vesting schedule.

Is the Form 4 transaction for CBU an open-market buy or sale?

The Form 4 for Community Financial shows a grant of restricted stock units coded as an acquisition (award), not an open-market buy or sale. No transaction price is listed, indicating this is compensation-based equity rather than shares purchased or sold in the public market on that date.

How many Community Financial common shares does the insider hold after this filing?

Following the reported grant, the filing shows 5,180.604 Community Financial common shares held directly by the insider. It also shows 218 shares held indirectly by a spouse and 654.8825 shares held indirectly through the company’s 401(k) plan, based on a current plan statement.

What does each CBU restricted stock unit represent in this grant?

Each restricted stock unit in this award represents a contingent right to receive one share of Community Financial System common stock. The units only convert into actual shares as they vest over time, starting March 1, 2027, subject to the vesting schedule described in the footnotes.