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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
1382096	S. Robert Brown	C/O Nxstage Medical, Inc. 350 Merrimack Street Lawrence MA 01843	President, Kidney Care	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	2014-12-02	34,700	$14.44	82,328	No	4	M	Direct
Common Stock	Disposition	2014-12-02	34,700	$17.44	47,628	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	2014-12-02	34,700	$0.00	34,700	$14.44

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
300	2008-01-07	2014-12-06	No	4	M	Direct

Footnotes

This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 12, 2014.
This represents the weighted average price for shares sold in multiple transactions at prices ranging from $17.24 to $17.58, inclusive. Full information regarding the number of shares sold at each separate price within the range will be provided to NxStage Medical, Inc., any security holder of NxStage Medical, Inc. or the staff of the Securities and Exchange Commission, upon request.