Qualys Announces Full Exercise of Underwriters' Over-Allotment Option

REDWOOD CITY, CA--(Marketwire - Oct 1, 2012) - Qualys, Inc. (NASDAQ: QLYS), a pioneer and leading provider of cloud security and compliance solutions, today announced that the underwriters of its initial public offering exercised in full their option to purchase an additional 1,136,250 shares of common stock from Qualys to cover over-allotments. As a result, the total initial public offering size is 8,711,250 shares of common stock, which consists of 7,836,250 shares of common stock to be sold by Qualys and 875,000 shares of common stock to be sold by certain selling stockholders. All shares sold in the offering are being sold at a price to the public of $12.00 per share. Closing of the sale of all shares sold in the offering is expected to occur on October 3, 2012.

J.P. Morgan Securities LLC and Credit Suisse Securities (USA) LLC are acting as joint bookrunning managers for the 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 offering.

A registration statement relating to these securities has been filed with, and declared effective by, the Securities and Exchange Commission. The offering is being made only by means of a prospectus. A copy of the final prospectus relating to the offering may be obtained from: J.P. Morgan Securities LLC, Attention: Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, New York 11717, Phone: (866) 803-9204; or Credit Suisse Securities (USA) LLC, Attention: Prospectus Department, One Madison Avenue, New York, New York 10010, Phone: (800) 221-1037 or newyork.prospectus@credit-suisse.com.

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.