X0508 4 2024-02-05 0 0001107843 QUALYS, INC. QLYS 0001558242 Thakar Sumedh S C/O QUALYS, INC. 919 E. HILLSDALE BLVD. FOSTER CITY CA 94404 1 1 0 0 CEO & President 0 Common Stock 2024-02-05 4 A 0 14005 0.00 A 189586 D Common Stock 2024-02-05 4 F 0 7098 168.24 D 182488 D Common Stock 2024-02-05 4 A 0 12797 0.00 A 195285 D Common Stock 2024-02-05 4 F 0 6486 168.24 D 188799 D Common Stock 2024-02-05 4 A 0 14831 0.00 A 203630 D Common Stock 2024-02-05 4 F 0 7517 168.24 D 196113 D Represents the acquisition of shares upon the determination of the Board of Directors of the Issuer that the performance conditions were met with respect to performance shares awards granted to the Reporting Person on April 27, 2021. The reported shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of performance restricted stock units awarded to the Reporting Person on April 27, 2021. Represents the acquisition of shares upon the determination of the Board of Directors of the Issuer that the performance conditions were met with respect to performance shares awards granted to the Reporting Person on October 28, 2021. The reported shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of performance restricted stock units awarded to the Reporting Person on October 28, 2021. Represents the acquisition of shares upon the determination of the Board of Directors of the Issuer that the performance conditions were met with respect to performance shares awards granted to the Reporting Person on October 27, 2022. The reported shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of performance restricted stock units awarded to the Reporting Person on October 27, 2022. /s/ Bruce Posey by power of attorney for Sumedh S. Thakar 2024-02-07