X0306 4 2015-01-20 0 0001364962 IMPERVA INC IMPV 0001533545 Kraynak Mark E. C/O IMPERVA, INC. 3400 BRIDGE PARKWAY, SUITE 200 REDWOOD SHORES CA 94065 0 1 0 0 Chief Product Officer Common Stock 2015-01-20 4 S 0 2000 44.40 D 8000 D Common Stock 2015-01-20 4 S 0 1000 45.00 D 7000 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. Represents a weighted average sales price per share. These shares were sold in multiple transactions at prices ranging from $43.75 to $44.55 per share. The Reporting Person has provided to the Issuer, and undertakes to provide to the staff of the Securities and Exchange Commission or any security holder of the Issuer, upon request, full information regarding the number of shares purchased at each separate price within the range. /s/ Tram Phi, as attorney-in-fact 2015-01-21