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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
Common Stock	Acquisiton	2010-03-08	54,124	$0.00	113,001	No	4	M	Direct
Common Stock	Disposition	2010-03-08	54,124	$9.86	58,877	No	4	S	Direct
Common Stock	Acquisiton	2010-03-09	6,284	$0.00	65,161	No	4	M	Direct
Common Stock	Acquisiton	2010-03-09	8,043	$0.00	73,204	No	4	M	Direct
Common Stock	Acquisiton	2010-03-09	1,316	$0.00	74,520	No	4	M	Direct
Common Stock	Acquisiton	2010-03-09	7,516	$0.00	82,036	No	4	M	Direct
Common Stock	Disposition	2010-03-09	23,159	$10.03	58,877	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	M	Direct
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	2010-03-08	54,124	$0.00	54,124	$3.76
Common Stock	Stock Option (right to buy)	Disposition	2010-03-09	6,284	$0.00	6,284	$3.76
Common Stock	Stock Option (right to buy)	Disposition	2010-03-09	8,043	$0.00	8,043	$4.10
Common Stock	Stock Option (right to buy)	Disposition	2010-03-09	1,316	$0.00	1,316	$4.10
Common Stock	Stock Option (right to buy)	Disposition	2010-03-09	7,516	$0.00	7,516	$5.47

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
6,284	2001-09-22	2011-08-22	No	4	M	Direct
0	2001-09-22	2011-08-22	No	4	M	Direct
0	2003-03-04	2013-02-04	No	4	M	Direct
0	2002-04-07	2012-03-07	No	4	M	Direct
0	2004-03-13	2014-02-13	No	4	M	Direct

Footnotes

The shares were sold in multiple transactions on March 8, 2010 at an actual purchase price ranging from $9.645 to $10.15 per share. The price reported reflects the weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares purchased at each separate price.
The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 10, 2009.
The shares were sold in multiple transactions on March 9, 2010 at an actual purchase price ranging from $10.00 to $10.14 per share. The price reported reflects the weighted average purchase price for the transactions. The reporting person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares purchased at each separate price.
This stock option vested over four years in 48 equal monthly installments.