X0306 4 2020-06-30 0 0001323885 AtriCure, Inc. ATRC 0001560591 Wade M. Andrew 7555 INNOVATION WAY MASON OH 45040 0 1 0 0 CFO Common Stock 2020-06-30 4 A 0 364 28.11 A 140537 D Shares acquired pursuant to the AtriCure, Inc. 2018 Employee Stock Purchase Plan for the period ended June 30, 2020. In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the issuer's common stock on January 1, 2020, which was the first trading day of the applicable offering period. The closing price on January 1, 2020 was $33.07. /s/ M. Andrew Wade 2020-07-02