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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
1341405	L Winifred Swan	C/O Nxstage Medical, Inc. 439 South Union Street, 5Th Floor Lawrence MA 01843	Svp And General Counsel	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	Acquisiton	2012-03-08	7,500	$8.55	27,680	No	4	A	Direct
Common Stock	Disposition	2012-03-08	10,500	$18.24	17,180	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	A	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	2012-03-08	7,500	$0.00	7,500	$8.55

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
16,994	2005-09-15	2012-09-15	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, amended August 23, 2010, amended on December 16, 2010 and further amended on November 8, 2011.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $18.145 to $18.27. 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 stock option reported on this Form 4 was immediately exercisable as of the grant date for all shares of common stock that may be purchased under such stock option.