NXSTAGE MEDICAL INC

CUSIP: 67072V103 Class: COMMON STOCK

FORT WASHINGTON INVESTMENT ADVISORS INC /OH/'s Holding History (CIK: 0001009016)

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

Q2 2014
Shares 35,565 Value ($000) $511 Avg Close — Range —
Q1 2014
Shares 36,823 Value ($000) $469 Avg Close — Range —
Q4 2013
Shares 219,082 Value ($000) $2,191 Avg Close — Range —
Q3 2013
Shares 267,755 Value ($000) $3,524 Avg Close — Range —
Q2 2013
Shares 584,698 Value ($000) $8,349 Avg Close — Range —