IMPERVA INC

CUSIP: 45321L100 Class: COM

Choate Investment Advisors's Holding History (CIK: 0001399794)

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

Q3 2013
Shares 17,053 Value ($000) $716,567 Avg Close — Range —
Q2 2013
Shares 17,144 Value ($000) $772,166 Avg Close — Range —