Tenable is a cybersecurity software company focused on vulnerability and exposure management. Its core product is the Tenable One platform, which gives enterprise security teams a unified view of risk across traditional IT, cloud, operational technology (OT), web applications, identity systems, and AI workloads. Security teams use Tenable to discover assets, identify vulnerabilities and misconfigurations, prioritize which risks matter most, and remediate them before attackers can exploit them. Tenable's roots trace to its Nessus vulnerability scanner, launched in 1998, which remains widely deployed among smaller organizations and feeds data into its broader platform. Tenable One extends this core vulnerability management (VM) capability into what Tenable calls "exposure management," applying AI-driven prioritization and increasingly automated remediation workflows. Tenable sells exclusively through a channel model — distributors and resellers — with its direct sales force working alongside partners. The company serves over 40,000 organizations across more than 170 countries. Revenue is roughly 96% recurring subscriptions, with customers paying annual or multi-year fees for SaaS access. Tenable uses a land-and-expand model: customers typically start with core VM and expand into the broader Tenable One platform, adding cloud, OT, identity, and AI modules over time. Tenable One deals command a 50-90% average selling price premium over standalone VM, making platform conversion of the existing VM install base the primary near-term growth driver. Tenable recently acquired Vulcan Cyber, adding third-party data ingestion from over 100 security tools, and Apex Security, expanding its AI attack surface capabilities.