SUNNYVALE, Calif., Nov.17, 2009 - Fortinet® - a market-leading network security provider and worldwide leader of unified threat management (UTM) solutions - today announced its initial public offering of 12,500,000 shares of its common stock at a price to the public of $12.50 per share. The shares will begin trading on Wednesday, November 18, 2009 on the NASDAQ Global Market under the ticker symbol "FTNT." Of the shares in the offering, 5,781,683 shares are being offered by the company and 6,718,317 shares are being offering by selling stockholders. In addition, Fortinet has granted the underwriters a 30-day option to purchase up to an additional 1,875,000 shares of common stock to cover over-allotments, if any. Fortinet will not receive any proceeds from the sale of shares by the selling stockholders.

Morgan Stanley & Co. Incorporated, J.P. Morgan Securities Inc., and Deutsche Bank Securities Inc. are acting as joint book-runners for the offering. obert W. Baird & Co. Incorporated, BC Capital Markets Corporation, ThinkEquity LLC, JMP Securities LLC, and Signal Hill Capital Group LLC are acting as co-managers.

The offering of these securities will be made only by means of a prospectus, copies of which may be obtained from Morgan Stanley & Co. Incorporated, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014, telephone: (866) 718-1649, or by emailing prospectus@morganstanley.com; J.P. Morgan, Attention: Prospectus Department, 4 Chase Metrotech Center, CS Level, Brooklyn, NY 11245, telephone: (718) 242-8002, or by emailing addressing.services@jpmorgan.com; and Deutsche Bank Securities Inc., 100 Plaza One, Jersey City, New Jersey 07311, Telephone: (800) 503-4611, or by emailing prospectusrequest@list.db.com.

A registration statement relating to these securities has been declared effective by the Securities and Exchange Commission. This press release shall not constitute an offer to sell or a solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.