NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

ARDSLEY ADVISORY PARTNERS LP's Holding History (CIK: 0000900529)

Note: Option positions (PUT/CALL) are excluded.

Q1 2016
Shares 10,000 Value ($000) $150 Avg Close — Range —
Q2 2015
Shares 30,000 Value ($000) $429 Avg Close — Range —
Q2 2013
Shares 10,000 Value ($000) $143 Avg Close — Range —