Rein Security, a New York and Tel Aviv-based startup founded in 2024, has raised $25 million in a Series A round announced on October 8, 2026, 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. Since launching its product in January 2026, the company reports revenue has grown 8x and its customer base has expanded 5x. The platform uses patented sidecar technology that provides real-time visibility into AI agent actions, enabling security teams to block harmful operations instantly. Customers include Dun & Bradstreet and Lemonade across financial services, healthcare, and retail sectors.
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