X0306 4 2015-05-06 0 0001364962 IMPERVA INC IMPV 0001402348 Slootman Frank C/O IMPERVA, INC. 3400 BRIDGE PARKWAY, SUITE 200 REDWOOD SHORES CA 94065 1 0 0 0 Common Stock 2015-05-06 4 M 0 3120 0.00 A 24475 D Restricted Stock Units 2015-05-06 4 M 0 3120 0.00 D 2015-06-05 Common Stock 3120 0 D Stock Option (right to buy) 45.35 2015-05-06 4 A 0 3075 0.00 A 2025-05-05 Common Stock 3075 3075 D Restricted Stock Units 2015-05-06 4 A 0 1433 0.00 A 2016-06-05 Common Stock 1433 1433 D Represents the number of shares that were acquired in connection with the settlement of the restricted stock units listed in Table II. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer upon vesting. The restricted stock units vest as follows: 100% of the underlying shares vest one year following the vesting commencement date of May 6, 2014. The Issuer has up to 30 days following vesting to settle. The actual expiration date will be immediately following settlement. This stock option vests as to 100% of the underlying shares 12 months following the vesting commencement date of May 6, 2015. This stock option is subject to accelerated vesting as to 100% of such shares following a change in control of the Issuer. The restricted stock units vest as follows: 100% of the underlying shares vest one year following the vesting commencement date of May 6, 2015. The restricted stock units are subject to accelerated vesting as to 100% of such shares following a change in control of the Issuer. /s/ Tram Phi, Attorney-in-Fact 2015-05-07