Rein Security Raises $25 Million to Provide Runtime Control for AI Agents

Rein Security, an Israeli cybersecurity firm, has raised $25 million in a Series A funding round to expand its platform for AI agent control. The company, founded by Unit 8200 alumni Matan Bar-Efrat and Netanel Rubin, has seen its revenue grow eightfold since the beginning of the year, reflecting the urgent market need for AI governance. Rein Security’s platform utilizes a 'sidecar' technology that runs within the agent's execution environment, allowing security teams to monitor every action an agent takes in real-time. Unlike traditional gateway security products that sit at the network edge, Rein’s approach provides deep visibility into the code and resources accessed by autonomous agents. This allows for the application of real-time guardrails that can block harmful actions before they are completed. As enterprises increasingly deploy autonomous agents to handle sensitive business processes, Rein Security’s runtime governance model is positioning itself as a critical component of the AI-native enterprise stack.