Rein Security raises $25M Series A to protect companies from AI agent security risks; revenue grows eightfold since January 2026 launch as thousands of agents secured across enterprises in Tel Aviv and New York.

Rein Security raises $25 million Series A as companies struggle to control their AI agents

Rein Security has raised $25 million in a Series A funding round, bringing the company's 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 by Matan Bar-Efrat and Netanel Rubin, Rein employs 31 people and has offices in Tel Aviv and New York.The funding comes as organizations rapidly deploy AI agents with increasingly broad access to business systems, data and w...