X0306 4 2021-12-31 0 0001323885 AtriCure, Inc. ATRC 0001230584 CARREL MICHAEL H 7555 INNOVATION WAY MASON OH 45040 1 1 0 0 President, CEO, & Director Common Stock 2021-12-31 4 A 0 141 59.10 A 488992 D Common Stock 690 I Held by reporting person's children Shares acquired pursuant to the AtriCure, Inc. 2018 Employee Stock Purchase Plan for the period ended December 31, 2021. In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on December 31, 2021, which was the last trading day of the applicable offering period. The closing price on December 31, 2021 was $69.53. The Reporting Person disclaims beneficial ownership of these securities, except as to his pecuniary interest therein. /s/ Michael H. Carrel 2022-01-04