PRESS RELEASE

SUNNYVALE, Calif. - Aug 10, 2009 - Fortinet, Inc., a provider of network security appliances and unified threat management (UTM) solutions, today announced that it has filed a registration statement on Form S-1 with the Securities and Exchange Commission relating to a proposed initial public offering of its common stock. The shares in the offering will be offered by Fortinet and certain selling stockholders. The number of shares to be offered and the price range for the offering have not been determined.

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

Copies of the preliminary prospectus for the offering, when available, may be obtained from any of Morgan Stanley & Co. Incorporated, Attention: Prospectus Department, 180 Varick Street, New York, NY 10014, or by e-mail: [email protected]; J.P. Morgan Securities Inc., 4 Chase Metrotech Center, CS Level, Brooklyn, NY, 11245, Telephone: (718) 242-8002; and Deutsche Bank Securities Inc., 100 Plaza One, Jersey City, New Jersey 07311, Telephone: (800) 503-4611.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. 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.

Fortinet is a worldwide provider of network security and unified threat management (UTM) solutions. Our products and subscription services provide broad, integrated and high-performance protection against dynamic security threats while simplifying the IT security infrastructure. Our customers include enterprises, service providers and government entities worldwide, including the majority of the 2009 Fortune Global 100. Fortinet is headquartered in Sunnyvale, Calif., with offices around the world.