| Dec 20, 2018 AForm 4 → | Dec 21, 11:36 am EST | COMMUNITY BANK SYSTEM, INC.CBU | 312 | $55.65 | $17,375 | 4,722 | — | |
| Sep 20, 2018 AForm 4 → | Sep 21, 3:18 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 274 | $63.50 | $17,375 | 4,409 | — | |
| Jun 28, 2018 AForm 4 → | Jul 2, 5:31 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 292 | $59.55 | $17,375 | 4,115 | — | |
| Mar 22, 2018 AForm 4 → | Mar 26, 1:50 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 320 | $54.34 | $17,375 | 1,031 | — | |
| Mar 20, 2018 MForm 4/A → | Apr 18, 9:10 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 566 | — | — | 2,917 | — | |
| Mar 20, 2018 AMForm 4 → | Mar 22, 8:40 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 1,195 | — | — | 711 | — | amended |
| Jan 15, 2018 MForm 4/A → | Apr 18, 9:06 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 1,224 | — | — | 3,484 | — | |
| Jan 15, 2018 MForm 4 → | Jan 16, 5:27 pm EST | COMMUNITY BANK SYSTEM, INC.CBU | 1,184 | — | — | 1,258 | — | amended |
| Dec 21, 2017 AForm 4 → | Dec 22, 2:57 pm EST | COMMUNITY BANK SYSTEM, INC.CBU | 277 | $55.15 | $15,250 | 2,443 | — | |
| Sep 27, 2017 AForm 4 → | Sep 28, 5:06 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 280 | $54.53 | $15,250 | 2,166 | — | |
| Jun 28, 2017 AForm 4 → | Jun 29, 5:51 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 274 | $55.64 | $15,250 | 1,869 | — | |
| Mar 22, 2017 AForm 4 → | Mar 23, 5:44 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 290 | $52.67 | $15,250 | 1,579 | — | |
| Mar 15, 2017 AForm 4 → | Mar 17, 3:53 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 553 | — | — | 1,416 | — | |
| Jan 2, 2017 MForm 4/A → | Apr 18, 2018, 9:04 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 3,694 | — | — | 3,476 | — | |
| Jan 2, 2017 MForm 4 → | Jan 3, 5:33 pm EST | COMMUNITY BANK SYSTEM, INC.CBU | 5,922 | — | — | 1,248 | — | amended |
| Dec 22, 2016 AForm 4 → | Dec 23, 11:47 am EST | COMMUNITY BANK SYSTEM, INC.CBU | 273 | $61.45 | $16,750 | 7,170 | — | |
| Sep 21, 2016 AForm 4 → | Sep 23, 5:47 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 355 | $47.16 | $16,750 | 6,849 | — | |
| Jul 5, 2016 AForm 4 → | Jul 6, 3:27 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 419 | $39.96 | $16,750 | 6,443 | — | |
| Mar 16, 2016 AForm 4 → | Mar 18, 3:35 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 2,992 | $38.82 | $16,750 | 5,974 | — | |
| Dec 21, 2015 AForm 4 → | Dec 22, 4:25 pm EST | COMMUNITY BANK SYSTEM, INC.CBU | 386 | $40.16 | $15,500 | 5,497 | — | |
| Sep 21, 2015 AForm 4 → | Sep 22, 2:57 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 432 | $35.90 | $15,500 | 5,071 | — | |
| Jun 22, 2015 AForm 4 → | Jun 23, 5:48 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 413 | $37.57 | $15,500 | 838 | — | |
| Mar 18, 2015 AForm 4 → | Mar 20, 1:48 pm EDT | COMMUNITY BANK SYSTEM, INC.CBU | 2,831 | $35.50 | $15,500 | 4,159 | — | |