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

Role: President & CEO, Director
Signature: /s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Dimitar Karaivanov
Issuer symbol: CBU
Transactions as of: 18 Mar 2025
Transactions value $: $0
Form type: 4/A - Amendment
Filing time: 19 Mar 2025, 17:36:45 UTC
Date Of Original Report: 19 Mar 2025
Previous filing: 13 Mar 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	+4.53K	+23.55%	$0.00	23.8K	18 Mar 2025	Direct	F1
holding	CBU	Common Stock						2.69K	18 Mar 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	+16.7K		$0.00	16.7K	18 Mar 2025	Common Stock	16.7K	$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 4,529 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 16,725 shares.
F4	The option vests ratably on March 18, 2026, 2027, 2028, 2029, and 2030.