X0508 4 2024-02-06 0001018399 ENTERPRISE BANCORP INC /MA/ EBTC 0001034912 PUTZIGER MICHAEL T C/O ENTERPRISE BANCORP, INC. 222 MERRIMACK STREET LOWELL MA 01852 1 0 Common Stock 586.1787 I By Trust For Granddaughter Common Stock 2024-02-06 4 S 0 0.8851 28.77 D 204312 D Common Stock 2024-03-01 4 P 0 1398 27.47 A 205718.0525 D Common Stock 2024-03-01 4 P 0 357 27.44 A 206075.0525 D Includes 5.0805 shares acquired through the Issuer's dividend reinvestment plan on 3/1/24. Sale of fractional shares by transfer agent in connection with transfer of shares to a brokerage account. Includes 8.0525 shares acquired through dividend reinvestment on 3/1/24. /s/ John P. Clancy, Jr. as attorney-in-fact for Michael T. Putziger 2024-03-05