NxStage Medical: Investment Calculator

Calculate Current Value and Shares Since: October 27, 2005

Investment Date:	Original Shares:	Original Value:	Current Shares:	Current Value:	Percent Return:
10/27/2005	100	$ 1,176.00	100	$ 2,093.00	77.98%

Investment of $ 1,176.00 on 10/27/2005 would yield $ 2,093.00 today

Adjustments

There are no adjustments for your investment.

The Investment Calculator page and related information is provided by Mergent, a third party service. NxStage Medical, Inc. does not maintain this page and is not responsible for the accuracy, completeness or timeliness of the information. The results are for illustrative purposes only and should not be relied on for investment purposes. The timing and price of dividend reinvestments, taxes, commissions and other factors may affect the values shown. Please note that historical investment performance is not intended to indicate future performance.