NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

Palo Alto Investors LP's Holding History (CIK: 0001306923)

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

Q4 2014
Shares 20,200 Value ($000) $362 Avg Close — Range —
Q3 2013
Shares 44,129 Value ($000) $581 Avg Close — Range —
Q2 2013
Shares 44,129 Value ($000) $630 Avg Close — Range —