Rein Security says it has raised $25 million in early-stage funding to help enterprises secure agentic artificial intelligence systems at runtime. The company positions its product as an AI-native runtime security platform aimed at reducing risks from insecure AI agents that enterprises build, and at identifying or stopping malicious agents that attack them.
Across outlets, the funding is described as a Series A effort, led by Glilot Capital and Sienna Venture Capital. Rein says the round brings its total funding to about $35 million to date and will support product innovation and further research related to agentic AI security. SecurityWeek also reports plans to expand the company’s employee base, while other coverage emphasizes Rein’s focus on protecting enterprise environments from multiple security threats tied to AI agents.
The different articles largely align on the amount raised, the purpose—runtime agent security—and the general use of proceeds, with variation mainly in how each outlet frames the specific threats and business priorities.
