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Rein Security raises $25 million Series A as demand grows for AI agent security
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Rein Security has raised $25 million in Series A funding, bringing its total funding to $35 million as enterprises accelerate their adoption of AI agents and face new security challenges around autonomous systems.
The Israeli cybersecurity company is focused on securing AI agents at runtime, giving security teams visibility into agent actions and the ability to prevent potentially harmful activity before it reaches business systems.
The latest funding comes as enterprises increasingly use AI agents for workflows spanning customer support, procurement, onboarding, claims processing and software development.
A new security layer for enterprise AI
The growth of enterprise AI agents is creating a security challenge that traditional network and cloud monitoring may not fully address.
As organizations allow agents to execute tasks and interact with applications, databases and other systems, security teams need to understand not only where an agent is running but also what it is doing.
Rein is positioning its platform around this application layer, monitoring agent activity at runtime and enforcing controls around the actions agents are allowed to take.
Two sides of the AI agent security challenge
Rein's funding announcement highlights two parallel developments shaping the company's strategy.
The first is the growing deployment of AI agents inside enterprises. Organizations are increasingly moving beyond experimentation and giving agents responsibility for business workflows, creating a need for greater visibility and control.
The second is the use of AI by attackers. As offensive capabilities become more automated and adaptive, security teams face the prospect of attacks operating at machine speed.
For Rein, these trends point to the need for security controls that can operate directly at the application and agent layer rather than relying solely on network or cloud infrastructure.
From detection to prevention
Rein's platform is designed around runtime protection, monitoring an agent's actions and helping prevent harmful activity before it is executed.
The company says its approach does not require customer data to pass through a gateway or proxy. Instead, the platform operates at the point where an AI agent takes an action.
This reflects a broader shift in application security as organizations increasingly move from identifying vulnerabilities toward controlling how software and AI systems behave in production.
Revenue grows eightfold
Rein says its revenue has grown eightfold since January, while its customer base has increased fivefold.
The company says its technology is now securing thousands of AI agents and millions of actions for customers including Lemonade, Dun & Bradstreet, Swimlane, Flex and HiBob.
Those deployments reflect the growing range of enterprise workflows being assigned to AI agents and the resulting need to monitor their behavior.
Research highlights agent vulnerabilities
Rein's Agent Breakers research team has also focused on testing the security of AI agents in real-world environments.
The team presented research at Black Hat demonstrating how agents operated by two of the top 10 US companies could be compromised, highlighting potential weaknesses even where security gateways are already deployed.
The research supports Rein's broader argument that agent security requires controls that operate closer to the agent itself and can respond to actions in real time.
Backed by new funding
The $25 million Series A was co-led by Glilot Capital and Sienna Venture Capital, with Corner, Atlacle and RNP Capital Advisors also participating.
The round takes Rein's total funding to $35 million.
The company plans to use the new capital as it continues developing its platform and expanding its work with enterprises adopting AI agents.
Building for the agent economy
AI agents are becoming an increasingly important part of enterprise technology strategies, but their ability to act autonomously also introduces new questions around identity, permissions, monitoring and security.
For Rein, the opportunity is to establish a security layer that allows enterprises to deploy agents while maintaining control over what those systems can access and execute.
As enterprise AI adoption moves from experimentation toward operational use, the company's latest funding gives it additional resources to build around that emerging security requirement.
About Rein Security
Rein Security is an Israeli cybersecurity company focused on securing AI agents at runtime. Its platform provides visibility and control over AI agent actions, with the goal of preventing harmful activity as enterprises deploy autonomous systems across business workflows.