NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

WATER ISLAND CAPITAL LLC's Holding History (CIK: 0001222765)

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

Q4 2018
Shares 294,790 Value ($000) $8,437 Avg Close — Range —
Q3 2018
Shares 1,208,077 Value ($000) $33,693 Avg Close — Range —
Q2 2018
Shares 1,334,420 Value ($000) $37,230 Avg Close — Range —
Q1 2018
Shares 1,184,707 Value ($000) $29,452 Avg Close — Range —
Q4 2017
Shares 804,146 Value ($000) $19,484 Avg Close — Range —
Q3 2017
Shares 853,218 Value ($000) $23,549 Avg Close — Range —