X0306 4 2017-12-01 0 0001107843 QUALYS, INC. QLYS 0001558241 Deeba Amer C/O QUALYS, INC. 919 E. HILLSDALE BLVD. FOSTER CITY CA 94404 0 1 0 0 VP Corp Dev & Strat Alliances Common Stock 2017-12-01 4 M 0 2000 2.80 A 66644 D Common Stock 2017-12-01 4 S 0 1700 58.3031 D 64944 D Common Stock 2017-12-01 4 S 0 300 58.9333 D 64644 D Stock Option (right to buy) 2.80 2017-12-01 4 M 0 2000 0.00 D 2019-07-30 Common Stock 2000 31000 D The transactions reported on this Form 4 were 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 $57.70 to $58.65 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 sale price represents the weighted average price of the shares sold ranging from $58.80 to $59.10 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 fully vested and immediately exercisable. /s/ Bruce Posey by power of attorney 2017-12-05