X0306 4 2017-08-04 0 0001107843 QUALYS, INC. QLYS 0001558242 Thakar Sumedh S C/O QUALYS, INC. 1600 BRIDGE PARKWAY REDWOOD CITY CA 94065 0 1 0 0 Chief Product Officer Common Stock 2017-08-04 4 M 0 1011 8.40 A 128756 D Common Stock 2017-08-04 4 M 0 989 12.68 A 129745 D Common Stock 2017-08-04 4 S 0 7694 46.31 D 122051 D Stock Option (right to buy) 8.40 2017-08-04 4 M 0 1011 0.00 D 2022-04-29 Common Stock 1011 11904 D Stock Option (right to buy) 12.68 2017-08-04 4 M 0 989 0.00 D 2023-02-06 Common Stock 989 74011 D The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 30, 2017. The sale price represents the weighted average price of the shares sold ranging from $45.95 to $46.85 per share. Upon request by the Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. The option is subject to an early exercise provision and was immediately exercisable. One forty-eighth of the shares subject to the option vested on May 30, 2012 and one forty-eighth of the shares subject to the option vested monthly thereafter. The option is subject to an early exercise provision and was immediately exercisable. One thirty-sixth of the shares subject to the option vested on March 07, 2013 and one thirty-sixth of the shares subject to the option vested monthly thereafter. /s/ Bruce Posey by power of attorney for Sumedh S. Thakar 2017-08-08