Exhibit 99.1 Qualys Announces First Quarter 2024 Financial Results Revenue Growth of 12% Year-Over-Year GAAP EPS: $1.05; Non-GAAP EPS:$1.45 Raises 2024 GAAP EPS Guidance to $3.26-$3.50 Raises 2024 Non-GAAP EPS Guidance to $5.06-$5.30 FOSTER CITY, Calif., – May 7, 2024 – Qualys, Inc. (NASDAQ: QLYS), a pioneer and leading provider of disruptive cloud-based IT, security and compliance solutions, today announced financial results for the first quarter ended March 31, 2024. For the quarter, the Company reported ...