NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

ESSEX INVESTMENT MANAGEMENT CO LLC's Holding History (CIK: 0000201772)

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

Q1 2017
Shares 77,077 Value ($000) $2,068 Avg Close — Range —
Q4 2016
Shares 66,511 Value ($000) $1,743 Avg Close — Range —
Q3 2016
Shares 86,727 Value ($000) $2,167 Avg Close — Range —
Q2 2016
Shares 51,459 Value ($000) $1,116 Avg Close — Range —
Q1 2016
Shares 51,858 Value ($000) $777 Avg Close — Range —
Q4 2015
Shares 53,137 Value ($000) $1,164 Avg Close — Range —
Q2 2013
Shares 16,580 Value ($000) $237 Avg Close — Range —