IMPERVA INC

CUSIP: 45321L100 Class: COM

MASON STREET ADVISORS, LLC's Holding History (CIK: 0001167711)

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

Q1 2014
Shares 54,060 Value ($000) $3,011 Avg Close — Range —
Q4 2013
Shares 56,700 Value ($000) $2,729 Avg Close — Range —
Q3 2013
Shares 78,900 Value ($000) $3,315 Avg Close — Range —