SUNNYVALE, Calif., Nov.23, 2009 - Fortinet® (NASDAQ: FTNT) - a provider of network security appliances and unified threat management (UTM) solutions -today announced that it has closed its previously announced initial public offering of 12,500,000 shares of its common stock at a price to the public of $12.50 per share. In connection with the initial public offering, the underwriters exercised in full their option to purchase an additional 1,875,000 shares of common stock from the company. As a result, the total initial public offering size was 14,375,000 shares, which consisted of 7,656,683 shares sold by the company and the remaining 6,718,317 shares sold by the selling stockholders. 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. acted 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 served as co-managers.

A copy of the final prospectus for this offering 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 Securities Inc., 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 was 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.