A. Gillan Myer - 17 Mar 2026 Form 4 Insider Report for COMMUNITY FINANCIAL SYSTEM, INC. (CBU)

Reporting relationship: EVP, Chief Admin & HR Officer
Issuer ticker: CBU
Reported as of: 17 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 19 Mar 2026, 15:39:00 UTC
Prior SEC filing: 06 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Maureen Gillan-Myer

Key filing fact

A. Gillan Myer filed Form 4 for COMMUNITY FINANCIAL SYSTEM, INC. (CBU) on 19 Mar 2026.

Key facts

This page summarizes A. Gillan Myer's Form 4 filing for COMMUNITY FINANCIAL SYSTEM, INC. (CBU).
2 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 19 Mar 2026, 15:39.

Change

Previous filing in this sequence was filed on 06 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001670754 Primary reporting owner

Gillan-Myer Maureen A

Relationship: EVP, Chief Admin & HR Officer
Address: C/O COMMUNITY FINANCIAL SYSTEM, INC., 333 BUTTERNUT DRIVE, SYRACUSE
Signature: /s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Maureen Gillan-Myer
Signature date: 19 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CBU holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 6,647
Date: 17 Mar 2026
Ownership: Direct

CBU holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 251
Date: 17 Mar 2026
Ownership: By 401(k) Plan
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CBU transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +1,275
Change %
Price: $0.000000^*
Shares after: 1,275
Date: 17 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,275
Exercise price
Footnotes: F2, F3

CBU transaction Derivative

Stock Option

Award

Transaction value
Shares: +4,871
Change %
Price: $0.000000^*
Shares after: 4,871
Date: 17 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 4,871
Exercise price: $56.64
Footnotes: F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote 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.

Footnote F2

Each restricted stock unit represents a contingent right to receive on share of Community Financial System, Inc. common stock.

Footnote F3

The restricted stock units vest in three equal installments beginning March 1, 2027.

Footnote F4

The option vests ratably on March 17, 2027, 2028, 2029, 2030, and 2031.