X0306 4 2019-11-01 0000723188 COMMUNITY BANK SYSTEM, INC. CBU 0001201821 STICKELS ERIC C/O COMMUNITY BANK SYSTEM, INC. 5790 WIDEWATERS PARKWAY DEWITT NY 13214 1 Common Stock 2019-11-01 4 S 0 3000 68.1232 D 37663.9276 D Common Stock 8470.5038 I By Wife's Community Bank System, Inc. 401(k) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.1001 to $68.1693, inclusive. The reporting person undertakes to provide Community Bank System, Inc., any security holder of Community Bank System, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Danielle M. Cima, pursuant to a Confirming Statement executed by Eric E. Stickels 2019-11-04