X0206 3 2021-05-20 0 0001323885 AtriCure, Inc. ATRC 0001861996 Dahlquist Karl S. 7555 INNOVATION WAY MASON OH 45040 0 1 0 0 Chief Legal Officer Common Stock 15709 D Includes 14,814 shares of unvested restricted stock awarded under the AtriCure, Inc. 2014 Equity Incentive Plan. One third of the shares vest annually upon the respective one, two and three year anniversaries of the date of grant. Includes 895 shares acquired under the AtriCure, Inc. Employee Stock Purchase Plan. /s/ Karl S. Dahlquist 2021-05-24