Fastest-growing AI Security companies, Q3 2026

Zenity provides a security and governance platform for enterprise AI agents, copilots, and low-code/no-code development platforms. The company was founded in 2021 to address security challenges arising from business users developing applications outside traditional IT oversight and software development lifecycle controls.

Onyx Security provides an agentic AI security platform designed to help enterprise security teams discover, monitor, and govern AI agents operating within their environments. The company's core product, the Onyx Guardian Agent, addresses security risks introduced by AI agents deployed across multiple platforms, including those from AWS, Microsoft, Anthropic, Salesforce, Oracle, and others.

• Discovery: identifying and cataloging all AI agents in an environment
• Governance: establishing compliance frameworks and policy enforcement
• Exposure reduction: identifying risks and governance violations
• Runtime protection: real-time monitoring and control of agent actions
• Incident response: protocols for addressing security breaches

AIM Intelligence specializes in AI security through red teaming, guardrails, and safety evaluation services for artificial intelligence systems. The company focuses on detecting and mitigating risks in AI systems deployed across healthcare, finance, robotics, and computer-using agents.

Air secures AI agents add-ons across endpoint, cloud, and SaaS. Our core focus is the fastest-growing and least-governed part of that surface - the AI "supply chain" of add-ons that agents pull in: skills, plugins, MCPs, and subagents. These enter the organisation with almost no vetting today and are already being weaponized (malicious skills, token-drain, data exfiltration, shell execution).

• Air Control - Governance and control of agents across the enterprise, shadow ai discovery, posture management of agents configuration and connectivity
• Air Defend - Runtime protection of agents behavior in real time.
• Air Filter - Governing all agent add-ons which exist in the enterprise, continuously vetting of them, and detect and response to supply chain…

HiddenLayer provides security solutions specifically designed to protect artificial intelligence and machine learning systems. The company was founded in 2022 by security and ML professionals who experienced a real-world adversarial AI attack at Cylance in 2019, where attackers exploited an AI model using inference attacks to evade malware detection.

Rein Security develops a security platform for custom-built enterprise AI agents. The platform is deployed as a sidecar at what the company calls the AI-Native Runtime, the execution layer where agents run, and is intended to give security teams visibility into and control over agent actions.

• Visibility: records agent actions such as database accesses and API calls, correlates who accessed what and why, and provides an audit trail of agent…
• Prevention: baselines agent behavior automatically and applies action-level controls to stop deviations in real time without taking the agent offline.
• Posture: combines code security, vulnerability management, compliance, supply chain security and governance for agents, and shows which issues are…

Alice provides security and safety controls for AI applications and agents. As these systems move into customer-facing products, internal tools, and regulated workflows, they open new failure modes with real security, compliance, brand, and safety consequences: prompt abuse, policy bypass, model manipulation, and behavioral drift.

Gray Swan provides safety and security solutions for AI deployments. The company focuses on addressing threats faced by AI systems in environments where well-resourced attackers, external tool use, retrieval, and misuse could compromise operations. Their offerings include tools that assess the risks of AI deployments and secure models designed to provide security and safety capabilities.

The company serves enterprise organizations, frontier model developers, startups, and other entities that need to deploy AI systems with confidence. Gray Swan's approach addresses vulnerabilities in large language models and other AI systems that could be exploited through various attack vectors.

Neo is an agentic software control platform that answers 4 key questions every enterprise is currently facing: 1. What software is running? 2. What can it do? 3. Is it configured safely? 4. What should happen when it runs?

• Visibility: Full inventory of software. Every agent, plugin, skill, extension, and MCP servers across all endpoints.
• Real time attribution: Every action tied to the human or agent that caused it.
• Policy enforcement: Local Enforcement to control Skills, including use of Tools, System access, data exposure & movement.