AtriCure, Inc. — Director's Dealing 2010

Nov 2, 2010

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: AtriCure, Inc. (ATRC)
CIK: 0001323885
Period of Report: 2010-11-01

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

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1378887	Indirect
Common Stock	235628	Indirect

Footnotes

F1: Discovery Group I, LLC is the General Partner of Discovery Equity Partners, 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: 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.