Tenable operates a subscription-based Software-as-a-Service (SaaS) and software licensing business model with predictable, high-visibility recurring revenue: (1) Tenable One Exposure Management Platform (~40% of new bookings), billed as an annual SaaS subscription scaled by the number of licensed assets across IT, cloud, identity, and OT environments; (2) Tenable Vulnerability Management (formerly Tenable.io) and Tenable Security Center (~45% of revenue), providing core vulnerability scanning, compliance auditing, and risk-based prioritization for corporate IT infrastructure; (3) Specialized Cloud and Identity Modules (~10% of revenue), securing public cloud entitlements (Ermetic technology) and Active Directory configurations (Alsid technology); and (4) Nessus Professional Licenses (~5% of revenue), sold as annual recurring desktop and server licenses to independent consultants, penetration testers, and small security teams. Tenable generates gross margins exceeding 77% and maintains high customer retention rates driven by deep integration into corporate risk compliance workflows.