Maureen Gillan-Myer - Mar 18, 2025 Form 4/A - Amendment Insider Report for COMMUNITY FINANCIAL SYSTEM, INC. (CBU)

Role: EVP, Chief Admin & HR Officer
Signature: /s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Maureen Gillan-Myer
Stock symbol: CBU
Transactions as of: Mar 18, 2025
Transactions value $: $0
Form type: 4/A - Amendment
Date filed: 3/19/2025, 05:56 PM
Date Of Original Report: Mar 19, 2025
Previous filing: Mar 13, 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CBU	Common Stock	Award	$0	+1.23K	+28.56%	$0.00	5.55K	Mar 18, 2025	Direct	F1
holding	CBU	Common Stock						2.76K	Mar 18, 2025	By 401(k) Plan	F2

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	Stock Option	Award	$0	+4.55K		$0.00	4.55K	Mar 18, 2025	Common Stock	4.55K	$58.10	Direct	F3, F4

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

Explanation of Responses:

Id	Content
F1	This amendment is filed to correct the number of shares of restricted stock acquired. The correct number is 1,233 shares.
F2	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.
F3	This amendment is filed to correct the number of stock options acquired. The correct number is 4,553 shares.
F4	The option vests ratably on March 18, 2026, 2027, 2028, 2029, and 2030.