Rein is the security layer for Custom-built Enterprise Agents - the production AI agents running businesses worldwide. Enterprise AI adoption has evolved - from third-party chatbots, to employee productivity agents, to Enterprise Agents: AI agents that are processing payments, approving insurance claims, interacting with personal data, and accessing medical records. This new class of agent demands security built specifically for it. By sitting as a sidecar to the agent (not a gateway, proxy or eBPF), Rein’s platform protects enterprise agents with four pillars. First, it delivers full visibility into every action the agent takes, showing exactly how those actions connect to business outcomes. Second, it manages your agents' posture - from governing every action, to securing the agent's code, vulnerability management and supply chain security, compliance and governance - all under one roof. Third, it enforces guardrails over every agent action stopping it right before bad actions execute. And fourth, it does all of this while keeping data completely private and inside the organization. Customers across Finance, Healthcare, SaaS, and Energy, including Dun & Bradstreet, Lemonade, Swimlane and HiBob use Rein to secure the enterprise agents that drive their business.
Scaling: scale from {c2} to {c3}. Growing: momentum from 33 to 67. See the map.
No. 15 in this week's Top 40 Movers, down 2 from last week. Highest place 13, 3 weeks on the chart. See the chart.
Swimlane cut investigation and remediation from hours to minutes, saves 20-40 hours weekly, and blocks prompt injection inline.
Rein Security · 4 Nov 2026 · 1 source · Vendor sources onlyCISO Jonathan Jaffe quoted on 100% attack-detection accuracy, response time cut to milliseconds, zero customer data leaving cloud.
Rein Security · 21 Oct 2026 · 1 source · Vendor sources onlyRound brings total funding to $35 million; company reports 8x revenue growth and 5x customer growth since January 2026 launch.
Rein Security · 8 Oct 2026 · 6 sources · Reported by multiple independent sourcesEverything we recorded in the last 180 days.
By the Cyberfuturists
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