Rein Security raises $25 million Series A for enterprise AI runtime protection
Rein Security announced a $25 million Series A co-led by Glilot Capital and Sienna Venture Capital, bringing total funding to $35 million. The New York and Tel Aviv company is developing runtime security for enterprise AI agents, addressing risks created when autonomous systems access business data, applications and workflows. Corner Ventures, Atlacle and RNP Capital Advisors also participated. Rein positions its platform around protecting both the agents enterprises build and organizations from malicious agents used in attacks. The financing is intended to support company growth as enterprises expand production use of agentic systems. The official announcement confirms the round, investors and total capital raised, but it does not disclose current revenue, customer concentration, employee count or a detailed hiring plan. Candidates should view the financing as evidence of capacity to invest while verifying which teams and locations have approved openings and measurable customer demand.
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