X0306 4 2018-03-01 0 0001323885 AtriCure, Inc. ATRC 0001565823 Seith Douglas J 7555 INNOVATION WAY MASON OH 45040 0 1 0 0 Chief Operating Officer Common Stock 2018-03-01 4 A 0 35996 0.00 A 273416 D Common Stock 2018-03-01 4 F 0 19677 17.71 D 253739 D Common Stock 3500 I Held by spouse The Reporting Person acquired these shares pursuant to a Restricted Stock Award under the AtriCure, Inc. 2014 Stock Incentive Plan. One third of the shares will vest annually upon the respective one, two, and three year anniversaries of the date of grant. The Reporting Person has elected to transfer these shares to the Company to satisfy the tax withholding obligation incurred upon the vesting and release of shares previously acquired pursuant to Restricted Stock Awards. The Reporting Person disclaims beneficial ownership of these securities, except as to his pecuniary interest therein. /s/ Douglas J. Seith 2018-03-05