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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1180145	Cardiovascular Systems Inc	CSII	Surgical & Medical Instruments & Apparatus (3841)	411698056

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	2011-11-01	3,933	$8.00	1,811,027	No	4	P	Indirect	By Discovery Equity Partners, L.P.
Common Stock	Acquisiton	2011-11-01	567	$8.00	261,641	No	4	P	Indirect	By Pleiades Investment Partners - D, 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

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
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