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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
1409195	J. Michael Webb	C/O Nxstage Medical, Inc. 439 South Union Street Lawrence MA 01843	Svp, Quality & Regulatory	No	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	2010-12-31	5,522	$24.88	29,259	No	4	F	Direct
Common Stock	Disposition	2011-02-14	10,000	$20.85	19,259	No	4	S	Direct

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

Footnotes

This transaction reflects the withholding of shares of NxStage Medical, Inc.'s common stock to satisfy the reporting person's tax liability incurred in connection with the vesting of the second tranche of awards granted to him on March 3, 2010 (the "Award") pursuant to NxStage Medical Inc.'s 2009 Performance Share Plan. The Award was reported on a previous Form 4 filed on March 5, 2010.
This sale was effected pursuant to a Rule 10b5-1 plan adopted by the reporting person on December 3, 2010.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $20.68 to $21.15. 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.