NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q4 2018
Shares 11,000 Value ($000) $315 Avg Close — Range —
Q1 2018
Shares 69,976 Value ($000) $1,740 Avg Close — Range —
Q4 2017
Shares 80,742 Value ($000) $1,956 Avg Close — Range —
Q3 2017
Shares 73,386 Value ($000) $2,025 Avg Close — Range —
Q2 2017
Shares 1,630 Value ($000) $41 Avg Close — Range —
Q2 2015
Shares 9,018 Value ($000) $129 Avg Close — Range —