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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
1341403	Jr E Joseph Turk	C/O Nxstage Medical, Inc. 439 South Union Street, 5Th Floor Lawrence MA 01843	Svp Commercial Operations	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
Common Stock	Acquisiton	2010-11-03	2,613	$4.54	135,338	No	4	M	Direct
Common Stock	Acquisiton	2010-11-03	2,337	$2.11	137,675	No	4	M	Direct
Common Stock	Disposition	2010-11-03	4,950	$20.44	132,725	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2010-11-03	2,613	$0.00	2,613	$4.54
Common Stock	Stock Option (Right to Buy)	Disposition	2010-11-03	2,337	$0.00	2,337	$2.11

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
66,083	2008-04-27	2015-03-26	No	4	M	Direct
56,917	2009-04-05	2016-03-04	No	4	M	Direct

Footnotes

This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 12, 2010, and amended August 23, 2010.
This amended report amends the reporting person's original Form 4, filed on November 5, 2010, to reflect that the reported transaction comprised an exercise of derivative securities (stock option) and a disposition of the securities acquired upon exercise.
The option was granted March 27, 2008 and vests over four years in equal monthly installments.
The option was granted March 5, 2009 and vests over three years in equal monthly installments.