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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1323885	Atricure Inc.	ATRC	Surgical & Medical Instruments & Apparatus (3841)	341940305

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1312548	Discovery Group I, Llc	191 N. Wacker Drive Suite 1685 Chicago IL 60606	No	No	Yes	No
1323510	R Michael Murphy	C/O Discovery Group I, Llc 191 N. Wacker Drive Suite 1685 Chicago IL 60606	No	No	Yes	No
1323511	J Daniel Donoghue	C/O Discovery Group I, Llc 191 N. Wacker Drive Suite 1685 Chicago IL 60606	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-12-28	9,159	$10.27	1,438,238	No	4	P	Indirect	By Discovery Equity Partners, L.P.
Common Stock	Acquisiton	2010-12-28	1,541	$10.27	245,278	No	4	P	Indirect	By Pleiades Investment Partners - D, L.P
Common Stock	Acquisiton	2010-12-29	600	$10.21	1,438,838	No	4	P	Indirect	By Discovery Equity Partners, L.P.
Common Stock	Acquisiton	2010-12-30	100	$10.20	1,438,938	No	4	P	Indirect	By Discovery Equity Partners, L.P.
Common Stock	Acquisiton	2010-12-31	1,000	$10.20	1,439,938	No	4	P	Indirect	By Discovery Equity Partners, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Discovery Equity Partners, L.P.
No	4	P	Indirect	By Pleiades Investment Partners - D, L.P
No	4	P	Indirect	By Discovery Equity Partners, L.P.
No	4	P	Indirect	By Discovery Equity Partners, L.P.
No	4	P	Indirect	By Discovery Equity Partners, L.P.

Footnotes

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 ofits pecuniary interest therein
This transaction was executed in multiple trades at prices ranging from $10.20 to $10.27. The price reported above reflects the weightedaverage purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder ofthe issuer full information regarding the number of shares and prices at which the transaction was effected
Discovery Group I, LLC is an investment manager for Pleiades Investment Partners - D, L.P., which is a discretionary client of the reportingperson, that owns the reported securities. The reporting person disclaims beneficial ownership of the reported securities except to theextent of its pecuniary interest therein.
This transaction was executed in multiple trades at prices ranging from $10.20 - $10.22. The price reported above reflects the weightedaverage purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder ofthe issuer full information regarding the number of shares and prices at which the transaction was effected."