NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

K2 PRINCIPAL FUND, L.P.'s Holding History (CIK: 0001461790)

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

Q2 2018
Shares 44,565 Value ($000) $1,243 Avg Close — Range —
Q1 2018
Shares 151,794 Value ($000) $3,774 Avg Close — Range —
Q4 2017
Shares 203,106 Value ($000) $4,921 Avg Close — Range —