NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AM's Holding History (CIK: 0001132716)

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

Q4 2018
Shares 1,244,006 Value ($000) $35,604,000 Avg Close — Range —
Q3 2018
Shares 1,332,293 Value ($000) $37,158,000 Avg Close — Range —
Q2 2018
Shares 937,491 Value ($000) $26,156,000 Avg Close — Range —
Q1 2018
Shares 633,458 Value ($000) $15,748,000 Avg Close — Range —
Q4 2017
Shares 559,681 Value ($000) $13,561,000 Avg Close — Range —
Q3 2017
Shares 175,000 Value ($000) $4,830,000 Avg Close — Range —