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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1333170	Nxstage Medical Inc.	NXTM	Electromedical & Electrotherapeutic Apparatus (3845)	043454702

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1341407	S David Utterberg	C/O Nxstage Medical, Inc. 439 South Union Street, 5Th Floor Lawrence MA 01843		Yes	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	Disposition	2010-09-21	182,600	$18.08	6,452,709	No	4	S	Direct
Common Stock	Disposition	2010-09-21	17,400	$18.48	6,435,309	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Footnotes

This sale was effected pursuant to a Rule 10b5-1 plan adopted by the reporting person on March 16, 2010.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $17.35 to $18.34. The reporting person undertakes to provide to the issuer, any holder of the issuer's stock, or the SEC, upon request, full information regarding the number of shares sold at each separate price within the range described above.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $18.35 to $18.69. The reporting person undertakes to provide to the issuer, any holder of the issuer's stock, or the SEC, upon request, full information regarding the number of shares sold at each separate price within the range described above.