X0305 4 2012-05-23 0 0001323885 AtriCure, Inc. ATRC 0001336087 Drachman David J 6217 CENTRE PARK DRIVE WEST CHESTER OH 45069 1 1 0 0 President, CEO and Director Common Stock 2012-05-23 4 M 0 24553 1.33 A 482978 D Common Stock 2012-05-23 4 S 0 12755 8.13 D 470223 D Incentive Stock Option (right to buy) 1.33 2012-05-23 4 M 0 24553 0.00 D 2003-10-14 2012-10-14 Common Stock 24553 0 D The Reporting Person intends to apply proceeds from the disposition of these shares to the payment of taxes and other costs incurred in connection with the exercise of options reported separately. This transaction was executed in multiple trades at prices ranging from $8.07 to $8.18 per share. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. These options were granted on October 14, 2002 and are exercisable cumulatively at a rate of 25% per annum beginning on October 14, 2003 (one year from grant date). /s/ David J. Drachman 2012-05-24