144 0001558242 XXXXXXXX LIVE 0001107843 QUALYS, INC. 001-35662 919 E. Hillsdale Boulevard, 4th Floor Foster City CA 94404 6508016100 SUMEDH SHRINAND THAKAR Director Officer COMMON Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

25500 3261705.00 36095879 10/14/2025 NASDAQ Common 10/14/2025 Exercise of Stock Options Issuer N 19500 10/14/2025 Cash Common 01/30/2025 Performance Stock Units Issuer N 6000 01/30/2025 N/A N 10b5-1 Sales Plan for SUMEDH THAKAR

919 E. Hillsdale Boulevard, 4th Floor Foster City CA 94404

COMMON 09/15/2025 8500 1126183.70 10b5-1 Sales Plan for SUMEDH THAKAR

919 E. Hillsdale Boulevard, 4th Floor Foster City CA 94404

COMMON 08/14/2025 8500 1104602.65 The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. 10/14/2025 02/26/2025 /s/ Sumedh Shrinand Thakar