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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	Acquisiton	2011-12-01	10,000	$4.54	27,390	No	4	M	Direct
Common Stock	Disposition	2011-12-01	10,000	$19.71	17,390	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
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	2011-12-01	10,000	$0.00	10,000	$4.54

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
32,000	2008-04-27	2015-03-26	No	4	M	Direct

Footnotes

This sale was effected pursuant to a Rule 10b5-1 plan adopted by the reporting person on August 19, 2011.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $19.54 to $19.82. 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.
This option was granted on March 27, 2008 and vests over four years in equal monthly installments.