X0306 4 2016-01-19 0001018399 ENTERPRISE BANCORP INC /MA/ EBTC 0001034912 PUTZIGER MICHAEL T C/O ENTERPRISE BANCORP, INC. 222 MERRIMACK STREET LOWELL MA 01852 1 Common Stock 2016-01-19 4 P 0 1472 23.86 A 117560.4606 D Common Stock 485.7026 I By Trust For Granddaughter Report no longer includes indirect ownership of 985.4458 shares of former spouse. Issued in lieu of cash for director compensation. Includes 656.006 shares acquired through dividend reinvestment on 6/1/15. Includes 664.5897 shares acquired through dividend reinvestment on 9/1/15. Includes 596.2649 shares acquired through dividend reinvestment on 12/1/15. Includes 2.8822 shares acquired through dividend reinvestment on 6/1/15. Includes 2.8718 shares acquired through dividend reinvestment on 9/1/15. Includes 2.4663 shares acquired through dividend reinvestment on 12/1/15. /s/ John P. Clancy, Jr. as attorney-in-fact for Michael T. Putziger 2016-02-12