X0508 4 2026-02-03 0001107843 QUALYS, INC. QLYS 0001558242 Thakar Sumedh S C/O QUALYS, INC. 919 E. HILLSDALE BLVD. FOSTER CITY CA 94404 true true false false CEO & PRESIDENT 0 Common Stock 2026-02-03 4 A 0 20427 0 A 262565 D Common Stock 2026-02-03 4 F 0 10394 127.52 D 252171 D Common Stock 2026-02-03 4 A 0 19984 0 A 272155 D Common Stock 2026-02-03 4 F 0 10168 127.52 D 261987 D Common Stock 2026-02-03 4 A 0 15184 0 A 277171 D Common Stock 2026-02-03 4 F 0 7726 127.52 D 269445 D Common Stock 2026-02-03 4 A 0 401 0 A 269846 D Common Stock 2026-02-03 4 F 0 205 127.52 D 269641 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 share 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. 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 share awards granted to the Reporting Person on October 30, 2024. 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 30, 2024. 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 share awards granted to the Reporting Person on October 26, 2023. 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 26, 2023. /s/ Bruce Posey by power of attorney for Sumedh S. Thakar 2026-02-05