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Rein Security builds an AI-native runtime security platform that gives enterprises visibility and control over every action their AI agents take in production, blocking harmful behavior without routing data through a gateway or proxy.
- Founders
- Matan Bar Efrat · co-founder & CEO
- Netanel Rubin · co-founder & CTO
- Total raised
- $35 million · as its sources put it, more than the rounds on record
- Customers
- Lemonade, Dun & Bradstreet, HiBob, Flex, Swimlane
WHY IT MATTERS
As enterprise agents reach customer data, money, payments, and regulated workflows, Rein says traditional code scans, posture dashboards, and gateway logs can miss hidden prompt injections and harmful runtime behavior. Its $25 million Series A backs the bet that an in-process sidecar can trace every agent action, block deviations before execution, and keep data inside the organization, following 8x revenue growth and 5x customer growth since its January 2026 launch.
Checked against 13 sources today
SOURCES
- prnewswire.com/news-releases/rein-enables-the-next-wave-of-enterprise-ai-agents-with-security-built-for-the-enterprise-302801218.html/news-releases/rein-security-raises-25-million-to-secure-the-ai-agents-enterprises-build-and-stop-the-ones-that-attack-them-302901591.html
- reinsec.io/blog/series-a/about-us