X0306 4 2021-08-13 0 0001107843 QUALYS, INC. QLYS 0001879151 Philippe Courtot Family Trust C/O QUALYS, INC. 919 E. HILLSDALE BLVD. FOSTER CITY CA 94404 0 0 1 0 Common Stock 2021-08-13 4 S 0 13036 110.8509 D 5119351 D Common Stock 2021-08-13 4 S 0 13175 111.1852 D 5106176 D Common Stock 2021-08-13 4 S 0 8789 110.5924 D 5097387 D Common Stock 2021-08-18 4 S 0 5219 110.0191 D 5092168 D Common Stock 2021-08-19 4 S 0 20637 110.1201 D 5071531 D The sale price represents the weighted average price of the shares sold ranging from $110.75 to $111.00 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 $111.00 to $111.1852 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 $110.51 to $110.69 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 $110.00 to $110.095 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 $110.00 to $110.4450 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. /s/ Nicolas Courtot, Trustee 2021-08-20