X0306 4 2018-06-18 0 0001107843 QUALYS, INC. QLYS 0001045434 DIXON DONALD R 505 HAMILTON AVENUE SUITE 200 PALO ALTO CA 94301 1 0 0 0 Common Stock 2018-06-18 4 A 0 2588 0.00 A 89852 D Common Stock 82538 I See Footnote Common Stock 643 I See Footnote The reported securities represent restricted stock units which vest on the earlier of (i) June 18, 2019 or (ii) the day before the Issuer's 2019 annual meeting of stockholders, subject to the Reporting Person's continued service through each such vesting date. Reflects a transfer of 17,500 shares from the Reporting Person to the Donald and Elizabeth Dixon Family Limited Partnership. The shares are held directly by Donald and Elizabeth Dixon Family Limited Partnership, for which the Reporting Person and his spouse serve as general partners. The shares are held directly by Dixon Family Trust U/A Dated 6/18/88, for which the Reporting Person and his spouse serve as settlors. /s/ Bruce Posey by power of attorney 2018-06-20