X0306 4 2015-05-20 0 0001323885 AtriCure, Inc. ATRC 0001211913 JOHNSTON RICHARD M CAMDEN PARTNERS HOLDINGS, LLC 500 EAST PRATT STREET, SUITE 1200 BALTIMORE MD 21202 1 0 0 0 Stock Option (right to buy) 22.62 2015-05-20 4 A 0 10000 A 2016-05-20 2025-05-20 Common Stock 10000 10000 D Exercisable cumulatively at a rate of 33.33% per annum commencing on the earlier of (i) the anniversary of the date of grant and (ii) the date on which the Company's annual meeting of stockholders is held that year, provided the Reporting Person is a director immediately prior to such annual meeting. Not applicable /s/ M. Andrew Wade as Attorney-In-Fact for Richard M. Johnston 2015-05-22