# EDGAR Filing Document

**Accession Number:** 0001707871
**File Stem:** 0000723188-26-000016
**Filing Date:** 2026-2
**Character Count:** 5313
**Document Hash:** fcca0a282178e575d47aab7152bae576
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000723188-26-000016.hdr.sgml**: 20260223

**ACCESSION NUMBER**: 0000723188-26-000016

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260101

**FILED AS OF DATE**: 20260223

**DATE AS OF CHANGE**: 20260223

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Durkee Matthew K
- **CENTRAL INDEX KEY:** 0001707871

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-13695
- **FILM NUMBER:** 26663055

**MAIL ADDRESS:**
- **STREET 1:** 52 SOUTH BROAD STREET
- **CITY:** NORWICH
- **STATE:** NY
- **ZIP:** 13815
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** COMMUNITY FINANCIAL SYSTEM, INC.
- **CENTRAL INDEX KEY:** 0000723188
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATIONAL COMMERCIAL BANKS [6021]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 161213679
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 5790 WIDEWATERS PKWY
- **CITY:** DEWITT
- **STATE:** NY
- **ZIP:** 13214
- **BUSINESS PHONE:** 8007242262

**MAIL ADDRESS:**
- **STREET 1:** 5790 WIDEWATERS PARKWAY
- **CITY:** DEWITT
- **STATE:** NY
- **ZIP:** 13214

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COMMUNITY BANK SYSTEM, INC.
- **DATE OF NAME CHANGE:** 20130806

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COMMUNITY BANK NA, a subsidiary of Community Bank System Inc
- **DATE OF NAME CHANGE:** 20130729

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COMMUNITY BANK NA, a subsidiary of Community Bank System Inc.
- **DATE OF NAME CHANGE:** 20130726

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Durkee Matthew K<br><sub>(Last) (First) (Middle)</sub><br>C/O COMMUNITY FINANCIAL SYSTEM, INC.<br>5790 WIDEWATERS PARKWAY<br><sub>(Street)</sub><br>DEWITT, NY 13214<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>COMMUNITY FINANCIAL SYSTEM, INC. [ CBU ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-01-01 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[X] Officer (give title below)   [X] Other (specify below)<br>_SVP, Chief Banking Officer_ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock | 3257 | D |  |
| Common Stock | 9620.2561 | I | By 401(K)<sup>(1)</sup> |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Stock Option | <sup>(2)</sup> | 2033-03-14 | Common Stock | 2496 | $54.06 | D |  |
| Stock Option | <sup>(3)</sup> | 2034-03-19 | Common Stock | 5451 | $44.27 | D |  |
| Stock Option | <sup>(4)</sup> | 2035-03-18 | Common Stock | 4474 | $58.10 | D |  |

---

### Footnotes:

(1) The number of shares reported herein were acquired pursuant to Community Financial System, Inc.'s 401(k) Plan and are based on a current plan statement.

(2) The options vest ratably on March 14, 2024, 2025, 2026, 2027, and 2028.

(3) The options vest ratably on March 19, 2025, 2026, 2027, 2028, and 2029.

(4) The options vest ratably on March 18, 2026, 2027, 2028, 2029, and 2030.

**Signature:** /s/ Danielle M. Cima, pursuant to a Confirming Statement executed by Matthew K. Durkee  
**Date:** 2026-02-23

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**