Exhibit 99.1 Zscaler Reports First Quarter Fiscal 2026 Financial Results First Quarter Highlights SAN JOSE, California - November 25, 2025 - Zscaler, Inc. (Nasdaq: ZS), the leader in cloud security, today announced financial results for its first quarter of fiscal year 2026, ended October 31, 2025. "Our outstanding Q1 results demonstrate the strong demand we are experiencing for our Zero Trust and AI Security platform. With over $3.2B in Annual Recurring Revenue, growing over 25% year-over-year, and Rule-of ...