Community Financial (CBU) CFO has 273 shares withheld for taxes

Rhea-AI Filing Summary

Community Financial System, Inc. Executive Vice President and Chief Financial Officer Marya Burgio Wlos reported routine share movements related to compensation and retirement savings. The filing shows 273 shares of common stock were disposed of at $63.62 per share to cover taxes on a vesting restricted stock award, a non-market tax-withholding transaction rather than an open-market sale. After this event, she directly holds 1,993 shares of common stock. She also has an additional 488.6341 shares held indirectly through the company’s 401(k) Plan, based on a current plan statement, reflecting ongoing retirement plan participation rather than trading activity.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Wlos Marya Burgio

Role EVP & Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	273	$63.62	$17K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,993 shares (Direct, null); Common Stock — 488.634 shares (Indirect, By 401(k) Plan)

Footnotes (1)

1. Payment of tax liability associated with vesting of restricted stock award. 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.

Key Figures

Tax-withholding shares: 273 shares Tax-withholding price: $63.62 per share Direct holdings after transaction: 1,993 shares +1 more

4 metrics

Tax-withholding shares 273 shares Shares disposed to cover tax liability on restricted stock vesting

Tax-withholding price $63.62 per share Price for 273 shares delivered for tax obligations

Direct holdings after transaction 1,993 shares Common stock directly owned by CFO following the Form 4 transactions

401(k) Plan holdings 488.6341 shares Common stock held indirectly through Community Financial System’s 401(k) Plan

Key Terms

restricted stock award, 401(k) Plan, tax-withholding disposition

3 terms

restricted stock award financial

"Payment of tax liability associated with vesting of restricted stock award."

A restricted stock award is company shares given to an employee or executive that cannot be sold or fully owned until certain conditions—like staying with the company for a set time or hitting performance targets—are met. Think of it as a gift that only becomes yours after you fulfill specific obligations; for investors, these awards matter because they can increase the total shares outstanding when they vest, reveal how management is being paid and motivated, and create potential selling pressure when restrictions lift.

401(k) Plan financial

"acquired pursuant to Community Financial System, Inc.'s 401(k) Plan"

A 401(k) plan is a workplace retirement account that lets employees set aside part of their pay into a tax-advantaged savings pot, often with employers adding matching contributions — like a workplace piggy bank for future income. It matters to investors because the amount people save and how employers fund these plans influence consumer spending, corporate payroll costs and the flow of money into financial markets, which can affect stock prices and company valuations.

tax-withholding disposition financial

"Payment of exercise price or tax liability by delivering securities"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Wlos Marya Burgio

(Last) (First) (Middle)

C/O COMMUNITY FINANCIAL SERVICE, 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)
	EVP & Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/04/2026

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	05/04/2026		F(1)		273	D	$63.62	1,993	D
Common Stock								488.6341	I	By 401(k) Plan(2)

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

Explanation of Responses:

1. Payment of tax liability associated with vesting of restricted stock award.

2. 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.

	/s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Marya Burgio Wlos	05/05/2026
	** 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 did Community Financial System (CBU) CFO report in this Form 4?

The CFO reported a tax-related share disposition and updated holdings. 273 common shares were withheld to cover taxes on a restricted stock vesting, and her direct and 401(k) plan share balances were refreshed to reflect current positions.

Was the Community Financial System (CBU) CFO’s Form 4 a stock sale?

The Form 4 reports a tax-withholding disposition, not an open-market sale. 273 shares were delivered at $63.62 per share to satisfy tax obligations tied to a restricted stock award vesting, a common administrative compensation event.

How many Community Financial System (CBU) shares does the CFO hold after this filing?

After the reported transactions, the CFO directly owns 1,993 common shares. She also has 488.6341 additional shares held indirectly through the company’s 401(k) Plan, according to a current plan statement referenced in the filing footnotes.

What does the 401(k) Plan holding mean for Community Financial System (CBU) CFO?

The 401(k) Plan holding reflects retirement-focused ownership, not active trading. The filing notes 488.6341 common shares acquired through Community Financial System’s 401(k) Plan, based on a current plan statement, indicating ongoing participation in the company’s retirement program.

What is the significance of the F transaction code in the CBU Form 4?

The F code indicates shares used to pay taxes or exercise costs. In this case, 273 shares of Community Financial System common stock were disposed of to cover tax liability associated with the vesting of a restricted stock award, a routine compensation-related adjustment.