X0206 3 2017-07-25 0 0001018399 ENTERPRISE BANCORP INC /MA/ EBTC 0001282759 ANSIN KEN S C/O ENTERPRISE BANCORP 222 MERRIMACK STREET LOWELL MA 01852 1 Common Stock 3292.8039 D Common Stock 5848 I By Trust for Son G. Ansin Common Stock 5848 I By Trust for Son K. Ansin Common Stock 177898 I By Trust for Ronald M Ansin Grandchildren Common Stock 187676 I By Trust Common Stock 4645 I By Wife /s/ George L. Duncan, attorney-in-fact for Ken S. Ansin 2017-08-03