Community Financial System, Inc.

CBU·NYSE·$64.77Share Price as of 11/2·$3BMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/07/26 10-QQ1 ended 03/31/2605/08/26 10-KFY 202502/27/26 10-QQ3 ended 09/30/2511/06/25 10-QQ2 ended 06/30/2508/08/25

Disclosures

8-KCurrent report10/27/26 8-KCurrent report08/21/26 8-KCurrent report07/28/26 8-KCurrent report06/01/26 8-KCurrent report05/22/26

Prospectuses and Registrations

S-8Registration of securities for employees05/30/25 S-8Registration of securities for employees07/17/24 S-8Registration of securities for employees07/17/24 S-8Registration of securities for employees07/20/22 S-8 POSPost-effective amendment (S-8)07/20/22

Proxies

DEF 14ADefinitive proxy03/27/26 DEFA14AAdditional proxy materials03/27/26 DEF 14ADefinitive proxy03/28/25 DEFA14AAdditional proxy materials03/28/25 DEF 14ADefinitive proxy03/29/24

Ownership

144Proposed sale of securities10/22/26 Form 4Insider transaction09/18/26 Form 4Insider transaction09/18/26 Form 4Insider transaction09/10/26 Form 4Insider transaction08/28/26

Other

11-KEmployee stock purchase plan report06/18/26 ARSAnnual report to shareholders03/27/26 11-KEmployee stock purchase plan report06/06/25 ARSAnnual report to shareholders03/28/25 11-KEmployee stock purchase plan report06/25/24