NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

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

Q4 2015
Shares 403,440 Value ($000) $8,839 Avg Close — Range —
Q1 2015
Shares 575,491 Value ($000) $9,956 Avg Close — Range —
Q4 2014
Shares 563,691 Value ($000) $10,107 Avg Close — Range —
Q2 2014
Shares 325,950 Value ($000) $4,684 Avg Close — Range —
Q3 2013
Shares 518,036 Value ($000) $6,802 Avg Close — Range —
Q2 2013
Shares 300,150 Value ($000) $4,286 Avg Close — Range —