[AI Security Platform Rein Security Secures $25 Million Series A Funding, Led by Sienna Venture Capital and Others] According to Deep Tide TechFlow on October 8, as reported by pulse2, AI-native security platform Rein Security has completed a $25 million Series A funding round, 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. The company helps enterprises protect on-premises AI agents and defend against AI-driven attacks. It can monitor the code executed by AI agents and the resources they access, enabling real-time governance and control. The new funds will be used to accelerate product development, expand intelligent AI security research, and support global hiring.