NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q4 2018
Shares 1,322 Value ($000) $38 Avg Close — Range —
Q3 2018
Shares 1,522 Value ($000) $42 Avg Close — Range —
Q4 2017
Shares 734 Value ($000) $18 Avg Close — Range —
Q3 2017
Shares 2,574 Value ($000) $71 Avg Close — Range —
Q2 2017
Shares 10,463 Value ($000) $262 Avg Close — Range —
Q1 2017
Shares 192 Value ($000) $5 Avg Close — Range —
Q4 2016
Shares 475 Value ($000) $12 Avg Close — Range —
Q3 2016
Shares 2,350 Value ($000) $59 Avg Close — Range —
Q2 2016
Shares 375 Value ($000) $8 Avg Close — Range —
Q3 2015
Shares 31,195 Value ($000) $492 Avg Close — Range —
Q2 2015
Shares 24,830 Value ($000) $355 Avg Close — Range —
Q1 2015
Shares 745 Value ($000) $13 Avg Close — Range —
Q4 2014
Shares 5,533 Value ($000) $99 Avg Close — Range —
Q2 2014
Shares 2,863 Value ($000) $41 Avg Close — Range —
Q4 2013
Shares 1,181 Value ($000) $12 Avg Close — Range —
Q3 2013
Shares 681 Value ($000) $9 Avg Close — Range —