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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
1341411	H Jeffrey Burbank	C/O Nxstage Medical, Inc. 439 South Union Street, 5Th Floor Lawrence MA 01843	President & Ceo	Yes	Yes	No	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	2010-05-19	13,000	$12.70	660,906	No	4	S	Direct

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

Footnotes

This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 12, 2010.
The shares were sold in multiple transactions on May 19, 2010 at an actual sale price ranging from $12.5785 to $12.85 per share. The price reported reflects the weighted average sale price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
This amount has been reduced to reflect the reporting person's use of shares to satisfy his tax withholding liability incurred in connection with the awards granted to him on March 3, 2010 (the "Awards") pursuant to the Company's 2009 Corporate Bonus and 2009 Performance Share Plans. The shares were used to satisfy the tax withholding obligations on the date of grant.