Exhibit 99.1 Qualys Announces Second Quarter 2025 Financial Results Revenues: Revenues for the second quarter of 2025 increased by 10% to $164.1 million compared to$148.7 million for the same quarter in 2024. Revenue Growth of 10% Year-Over-Year Raises 2025 Revenue Guidance to $656-$662 million FOSTER CITY, Calif., – August 5, 2025 – Qualys, Inc. (NASDAQ: QLYS), a leading provider of disruptive cloud-based IT, security and compliance solutions, today announced financial results for the second quarter ended ...