COMMUNITY FINANCIAL SYSTEM, INC. — Director's Dealing 2025

Mar 19, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COMMUNITY FINANCIAL SYSTEM, INC. (CBU)
CIK: 0000723188
Period of Report: 2025-03-18

Reporting Person: Gillan-Myer Maureen A (EVP, Chief Admin & HR Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-03-18	Common Stock	A	4553	—	Acquired	8870	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-03-18	Stock Option	$58.10	A	1233	Acquired	2035-03-18	Common Stock (1233)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2761.8681	Indirect

Footnotes

F1: 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.

F2: The option vests ratably on March 18, 2026, 2027, 2028, 2029, and 2030.