AVAST Software Files Registration Statement for Proposed Initial Public Offering

PRAGUE, Czech Republic, December 21, 2011 – AVAST Software B.V., a leading global provider of security software delivered through a free-to-premium, or “freemium,” model, announced today that it has filed a registration statement on Form F-1 with the U.S. Securities and Exchange Commission (SEC) for a proposed initial public offering of its common stock. The number of shares to be offered and the price range for the offering have not yet been determined. A portion of the shares will be issued and sold by AVAST, and a portion will be sold by certain stockholders of AVAST.

UBS Limited and Deutsche Bank Securities Inc. are acting as joint bookrunning managers and Pacific Crest Securities LLC, Morgan Keegan & Company, Inc. and Macquarie Capital (USA) Inc. are acting as co-managers for the proposed offering. A copy of the prospectus relating to this offering, when available, may be obtained by contacting UBS Securities LLC, Attn: Prospectus Department, 299 Park Avenue, New York, NY 10171, or by telephone at: (888) 827-7275, or Deutsche Bank Securities Inc., Attn: Prospectus Department, Harborside Financial Center, 100 Plaza One, Jersey City, NJ 07311-3988, by telephone at: (800) 503-4611, or by email at: prospectus.cpdg@db.com.

A registration statement relating to these securities has been filed with the SEC 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 news release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of, the 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.