QUALYS, INC.

Securities Trading Plans of Directors and Executive Officers

On February 20, 2026, Wendy M. Pfeiffer, amember of our board of directors, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 2,000 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until February 23, 2027, or earlier if all transactions under the trading arrangement are completed. Prior to entering into the new Rule 10b5-1 trading arrangement in February 2026, Ms. Pfeiffer's previous Rule 10b5-1 trading arrangement expired according to its terms because all the transactions under the arrangement were completed.

On February 25, 2026, Jeffrey P. Hank, thechair of our board of directors, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 940 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until February 28, 2027, or earlier if all transactions under the trading arrangement are completed.

On February 27, 2026, Thomas P. Berquist, amember of our board of directors, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 1,450 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until February 27, 2027, or earlier if all transactions under the trading arrangement are completed.

On February 27, 2026, Sumedh S. Thakar, our Chief Executive Officer and a member of our board of directors, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 98,400 shares of our common stock, which represents the gross number of shares authorized to be sold during the duration of the plan, before excluding any shares withheld by the Company to satisfy its income tax withholding in connection with the net settlement of the equity awards. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until April 30, 2027, or earlier if all transactions under the trading arrangement are completed. This trading arrangement will not commence until the termination of his previous trading arrangement by its terms on April 30, 2026.

No other director or officer, as defined in Rule 16a-1(f), adopted orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” each as defined in Regulation S-K Item 408, during the three months ended March 31, 2026.