Redwood Shores, CA, November 10, 2011 – Imperva, Inc. (NYSE: IMPV), a pioneer and leader of a new category of data security solutions for high-value business data in the data center, today announced that the underwriters of its previously announced initial public offering have exercised in full their option to purchase 750,000 additional shares of common stock from the Company at the previously announced price to the public of $18 per share. Closing of the sale of the additional shares is expected to occur on November 15, 2011.

J.P. Morgan Securities and Deutsche Bank Securities are acting as joint book-running managers for the offering. RBC Capital Markets, Lazard Capital Markets and Pacific Crest Securities are acting as co-managers.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

A registration statement relating to these securities has been filed with, and declared effective by, the Securities and Exchange Commission on November 8, 2011.  The offering is being made only by means of a prospectus.  Copies of the final prospectus, when available, may be obtained by visiting the SEC website at http://www.sec.gov/ or by contacting J.P. Morgan Securities LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, or by telephone at (866) 803-9204; or Deutsche Bank Securities Inc., Attn: Prospectus Department, 100 Plaza One, Jersey City, New Jersey 07311-3988, by telephone at: (800) 503-4611, or by e-mail at: prospectus.cpdg@db.com.