Appointment of Director

The Board of Directors (the “ Board ”) of Imperva, Inc. (“ Imperva ”) appointed Roger J. Sippl to the Board, effective December 15, 2016, upon Mr. Sippl’s acceptance of such appointment.

In connection with his appointment to the Board, Mr. Sippl received restricted stock units with a number of shares equal to $400,000 divided by the closing price of Imperva’s common stock on the Nasdaq Global Select Market on the date of grant (the “ RSUs ”). The date of grant was December 16, 2016, the first Friday following Mr. Sippl’s acceptance of appointment to the Board. Accordingly, Mr. Sippl received RSUs for 10,554 shares. The RSUs will vest annually in equal installments over three years of service beginning on December 15, 2016. Upon a change in control of Imperva, the RSUs will vest in full. In addition, Mr. Sippl will receive an annual retainer of $30,000 for his service as a Board member. Mr. Sippl has not been appointed to a Board committee.

It is expected that Mr. Sippl will execute Imperva’s standard form of indemnification agreement. This agreement provides for indemnification for related expenses including, among other things, attorneys’ fees, judgments, fines and settlement amounts incurred by Mr. Sippl in any action or proceeding to the fullest extent permitted by applicable law.

The foregoing descriptions are qualified in their entirety by the full text of the Offer Letter, effective December 15, 2016, between Imperva and Mr. Sippl, attached as Exhibit 99.1 to this Current Report on Form 8-K, and the form of Indemnification Agreement, which was filed as Exhibit 10.4 to Imperva’s Amendment No. 4 to Form S-1 Registration Statement filed on October 28, 2011, which are incorporated herein by reference.

A copy of the press release announcing Mr. Sippl’s appointment is attached as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated herein by reference.