AtriCure, Inc. — Director's Dealing 2012

Dec 10, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AtriCure, Inc. (ATRC)
CIK: 0001323885
Period of Report: 2012-12-06

Reporting Person: Discovery Group I, LLC (10% Owner)
Reporting Person: Donoghue Daniel J (10% Owner)
Reporting Person: Murphy Michael R (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-12-06	Common Stock	S	8558	$6.2149	Disposed	1751337	Indirect
2012-12-07	Common Stock	S	17300	$6.1284	Acquired	1734037	Indirect
2012-12-10	Common Stock	S	6035	$6.1047	Disposed	1728002	Indirect

Footnotes

F1: Discovery Group I, LLC is an investment manager for Pleiades Investment Partners - D, L.P., which is a discretionary client of the reporting
person, that owns the reported securities. The reporting person disclaims beneficial ownership of the reported securities except to the
extent of its pecuniary interest therein.

F2: This transaction was executed in multiple trades at prices ranging from $6.20 - 6.25. 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

F3: This transaction was executed in multiple trades at prices ranging from $6.10 - 6.16. 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

F4: This transaction was executed in multiple trades at prices ranging from $6.06 - $6.14. 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