NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

DEERFIELD MANAGEMENT COMPANY, L.P.'s Holding History (CIK: 0001009258)

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

Q3 2017
Shares 1,579,285 Value ($000) $43,588 Avg Close — Range —
Q2 2017
Shares 3,833,330 Value ($000) $96,102 Avg Close — Range —
Q1 2017
Shares 3,744,151 Value ($000) $100,456 Avg Close — Range —
Q4 2016
Shares 4,258,196 Value ($000) $111,607 Avg Close — Range —
Q3 2016
Shares 4,099,175 Value ($000) $102,438 Avg Close — Range —
Q2 2016
Shares 4,505,468 Value ($000) $97,679 Avg Close — Range —
Q1 2016
Shares 5,506,028 Value ($000) $82,535 Avg Close — Range —
Q4 2015
Shares 4,589,000 Value ($000) $100,545 Avg Close — Range —
Q3 2015
Shares 6,318,050 Value ($000) $99,636 Avg Close — Range —
Q2 2015
Shares 5,773,050 Value ($000) $82,468 Avg Close — Range —
Q1 2015
Shares 5,073,050 Value ($000) $87,764 Avg Close — Range —
Q4 2014
Shares 4,811,494 Value ($000) $86,270 Avg Close — Range —
Q3 2014
Shares 6,141,094 Value ($000) $80,633 Avg Close — Range —
Q2 2014
Shares 4,899,721 Value ($000) $70,409 Avg Close — Range —
Q1 2014
Shares 3,801,175 Value ($000) $48,427 Avg Close — Range —
Q4 2013
Shares 5,570,639 Value ($000) $55,706 Avg Close — Range —
Q3 2013
Shares 5,027,164 Value ($000) $66,157 Avg Close — Range —
Q2 2013
Shares 3,909,914 Value ($000) $55,834 Avg Close — Range —