Legion Security
Agentic security operations platform that learns analyst workflows and turns them into agentic playbooks
Reviewed by the Cyber Vendor Guide editorial team against the public sources cited below and information provided directly by the vendor · Last reviewed August 2026 · How we review listings
What is Legion Security?
Legion Security helps enterprise security teams scale detection, investigation and response using agentic AI. The platform captures and learns from the real workflows analysts already use, and turns those actions into agentic playbooks the team can trust. The vendor positions this as a way to adopt frontier AI models gradually while keeping operational trust, reducing manual effort and preparing for autonomous security capabilities. It deploys through the analyst's browser rather than through API integrations, and uses vision models combined with other methods to observe how analysts investigate alerts, so the enterprise can either codify those processes or optimise them into visual agentic workflows that the team can inspect. Legion Security has offices in New York and Tel Aviv and is backed by Coatue, Accel and Picture, with investors from Island, CrowdStrike, Wiz and Google DeepMind. The company was founded in 2024 by former Microsoft Sentinel team members and emerged from stealth in July 2025.
- ✓ Raised $38M total: an $8M seed led by Picture Capital and Accel, and a $30M Series A led by Coatue (Calcalist, Fortune)
- ✓ Founding team includes former members of Microsoft's Sentinel product, per Calcalist
- ✓ Browser-based deployment is designed to avoid custom API integration work, per the company
- ✓ Customers cited on the vendor site report outcomes such as an 81% reduction in MTTI/R (WELL Health Technologies, vendor-cited)
Key Features
The agentic security operations platform for the enterprise
Case studies
30,000 backlogged alerts processed in under two months — Virgin Money
60 percent reduction in alert backlog
Legion's agentic SOC automation processed 30,000 backlogged alerts for Virgin Money in under two months, learning the bank's existing analyst workflows along the way. Result as reported by Legion Security.
Sources & references
Where the information on this listing comes from. Always verify pricing and capabilities against the vendor before a purchasing decision.
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