Rein Security, a cybersecurity startup, has raised $25 million in a new funding round. The company specialises in protecting AI agents at runtime, a security approach that focuses on defending AI systems as they operate rather than only during development or training.
The investment will be directed toward product innovation, agentic research, and expanding the company's employee base. According to the announcement, these areas are central to Rein Security's plans to scale its technology and address emerging threats tied to AI agents.
The funding round highlights the growing attention on AI-specific security challenges, particularly as organisations deploy AI agents in more complex and autonomous roles.