NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

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

Q2 2017
Shares 1,959,318 Value ($000) $49,120 Avg Close — Range —
Q1 2017
Shares 331,204 Value ($000) $8,886 Avg Close — Range —
Q4 2016
Shares 444,156 Value ($000) $11,641 Avg Close — Range —
Q3 2016
Shares 451,031 Value ($000) $11,271 Avg Close — Range —
Q2 2016
Shares 591,298 Value ($000) $12,819 Avg Close — Range —
Q1 2016
Shares 596,501 Value ($000) $8,942 Avg Close — Range —
Q4 2015
Shares 553,548 Value ($000) $12,128 Avg Close — Range —
Q3 2015
Shares 825,292 Value ($000) $13,015 Avg Close — Range —