Legion Security provides an agentic security operations platform that learns from SOC teams to automate investigations.
- Categories
- Agentic SOC tools, SOAR and security automation
- Based in
- New York, United States
- Founded
- 2024
- Ownership
- Private
- Certifications
- ISO/IEC 27001, ISO/IEC 42001, SOC 2 Type 2, CSA STAR Level 1
About Legion Security
Legion Security sells an agentic security operations platform. It is built for enterprise security teams and helps them handle alerts and investigations. The platform learns from a team's own processes, tools and context rather than using generic playbooks. It deploys agents that fit the way analysts already work. The platform has three modes. Learning Mode watches analysts in the browser and maps their investigations and decisions. Companion Mode runs complete workflows through the browser while keeping human oversight. Autonomous Mode lets the agents work on their own when a team is ready. Legion works as a browser extension with no integrations or APIs, so teams can start within days. It also includes a data loss prevention layer and gives control over what is recorded and automated.
Products
- Learning ModePassively captures how analysts investigate and respond, then maps those workflows for full team visibility.
- Companion ModeExecutes complete workflows through analysts' browsers while maintaining human oversight and control at every step.
- Autonomous ModeBecomes an autonomous extension of the team, scaling expertise across every investigation when the team is ready.
Ownership and deals
- Raised $38m in a Series A roundInvestor CoatueReport on the Legion Security funding round of July 2025 (opens in a new tab)
Acquisitions come from SecurityWeek's monthly M&A round-ups from 2021 onwards, from Cybersecurity Ventures' quarterly M&A reports for 2020, and a few from Wikipedia lists. Funding rounds from 2022 onwards come from Return on Security's weekly Security, Funded newsletter. These are dated to the month. A few deals added from the news are dated to the day. Smaller deals may be missing. Amounts are in US dollars.