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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	President, North America	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	2012-06-29	3,684	$8.55	83,363	No	4	M	Direct
Common Stock	Disposition	2012-06-29	3,684	$16.62	79,679	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	2012-06-29	3,684	$0.00	3,684	$8.55

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
842	2006-09-15	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, December 16, 2010 and further amended on November 30, 2011.
The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $16.55 to $16.75. 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 September 15, 2005. This option vested as to 20% of the shares on September 15, 2006 and vests in equal monthly installments over the 48 months following September 15, 2006.