AI security startup Rein Security raises $25M Series A, total funding hits $35M
Israeli startup Rein Security closes $25M Series A for AI agent runtime security, claiming eightfold revenue growth since January.
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Israeli AI security startup Rein Security announced it has raised $25 million in a Series A funding round, bringing its total funding to $35 million.
The round was co-led by Glilot Capital and Sienna Venture Capital, with participation from Corner Ventures, Atlacle, and RNP Capital Advisors. Founded in 2024, the company develops runtime tools to secure enterprise AI agents against adversarial attacks.
According to Calcalist, Rein Security claims its revenue has grown eightfold and its customer base fivefold since launching its product in January 2026. The platform currently secures thousands of AI agents executing millions of actions.