Rein Security
Rein Security Raises $25M Series A for AI Agent Runtime Security
Rein Security announced $25M in Series A financing on October 8, 2026. Rein Security raised a $25 million Series A co-led by Glilot Capital and Sienna Venture Capital for its platform that secures enterprise AI agents at runtime.
Round details
The financing includes backing from Glilot Capital, Sienna Venture Capital, Corner Ventures, Atlacle, RNP Capital Advisors. The company did not publish a valuation with the announcement.
- Round: Series A
- Capital announced: $25M
- Total funding reported: $35M
- Headquarters: New York, NY and Tel Aviv, Israel
How the company plans to use the capital
Rein said it will use the new capital to accelerate product innovation, advance agentic research, and support global hiring.
Why this matters for GTM teams
The round points to investor interest in security tools built for autonomous enterprise AI agents, which the company said create risks that traditional approaches were not designed to detect or stop.
Fresh capital is often an operational signal rather than a buying signal by itself. Teams should validate the company’s hiring pattern, product launches, geographic expansion, and technology priorities before choosing the message and timing of outreach.
Source and methodology
This report is based on the company’s announcement and records the disclosed amount, round, investors, location, and stated use of funds. SalesTools Research does not estimate undisclosed valuation or revenue figures.
Primary source: Rein Security Series A announcement.
Company Info
Investors (5)
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