A. Gillan Myer - 29 Dec 2025 Form 4 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
Issuer symbol
CBU
Transactions as of
29 Dec 2025
Net transactions value
-$203,054
Form type
4
Filing time
04 Mar 2026, 12:09:56 UTC
Previous filing
19 Mar 2025
Next filing
04 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Gillan-Myer Maureen A EVP, Chief Admin & HR Officer C/O COMMUNITY FINANCIAL SYSTEM, INC., 333 BUTTERNUT DRIVE, SYRACUSE /s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Maureen Gillan-Myer 04 Mar 2026 0001670754

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CBU Common Stock Sale $203,054 -3,450 -100% $58.85 0 29 Dec 2025 By 401(k) Plan
holding CBU Common Stock 5,550 29 Dec 2025 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents common stock owned as of 12/29/2025.