Qualys, Inc. Files Registration Statement For Proposed Initial Public Offering

PRESS RELEASE

Redwood City, California – June 8, 2012 – Qualys, Inc., a pioneer and leading provider of cloud security and compliance solutions, announced today 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 shares of its common stock. The number of shares to be offered and the price range for the offering have not yet been determined.

J.P. Morgan Securities LLC and Credit Suisse Securities (USA) LLC are acting as joint bookrunning managers for the proposed offering, and RBC Capital Markets, LLC, Pacific Crest Securities LLC, Robert W. Baird & Co. Incorporated, JMP Securities LLC, Lazard Capital Markets LLC and First Analysis Securities Corporation are acting as co-managers for the proposed offering.

The offering will be made only by means of a prospectus. A copy of the preliminary prospectus, when available, may be obtained from J.P. Morgan Securities LLC, Attention: Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, or by telephone at (866) 803-9204; or Credit Suisse Securities (USA) LLC, Attention: Prospectus Department, One Madison Avenue, New York, New York, 10010, or by telephone at (800) 221-1037.

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. The registration statement on Form S-1 may be accessed through the SEC’s website at edgar.sec.gov.

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 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.