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Legion Security sells a security operations tool that installs as a browser extension, watches analysts work inside whatever tools they open, and learns to replay it with no integrations. The payoff is fast deployment and reach into homegrown systems no API exposes. Two founders held senior roles on the Microsoft Sentinel team Legion now sells against, and Coatue led a $30 million Series A after an $8 million seed from Accel and Picture Capital, with angels who work at Google, CrowdStrike, and Wiz. The proof comes from Legion and the press: its Fortune 500 adoption across finance, healthcare, and energy is vendor-reported, and public sources document no independent benchmark of the extension in a SOC it has not learned.
| Description | Legion Security builds a browser-native AI SOC analyst that learns how a security team investigates alerts and turns that knowledge into agentic workflows it can run with human oversight or autonomously. | [f1] |
|---|---|---|
| Founded | 2024 | [f2] |
| HQ | New York City, NY, US | [f3] |
| Funding | $38M total | [f4] |
| Latest funding | Series A, $30M, led by Coatue (July 2025), joining Accel and Picture Capital | [f5] |
| Product | What it does |
|---|---|
| Legion | A browser extension that observes analyst investigations across browser-accessible security tools, learns the team's workflows, and executes investigations in learning, guided, or autonomous modes. |
Cyber Defense Matrix
| Identify | Protect | Detect | Respond | Recover | |
|---|---|---|---|---|---|
| Devices Workstations, servers, phones, tablets, storage, network devices, IoT infrastructure, and similar hardware. | |||||
| Applications Software, interactions, and application flows on the devices. | |||||
| Networks Connections and traffic flowing among devices and apps, plus communication paths. | |||||
| Data Content at rest, in transit, or in use across devices, apps, and networks. | |||||
| Users The people using the devices, apps, networks, and data. |
Legion's browser extension learns how analysts investigate alerts across SIEM, threat intel, and email tools, then investigates and responds to threats through those tools. Legion applies AI to defend conventional assets and is mapped to the Cyber Defense Matrix. [f3]
How well the company can compete in its security market, scored across eight dimensions against public evidence.
| Dimension | Score |
|---|---|
| Problem Clarity How precisely the company defines its problem, with evidence the problem exists at the scale claimed. | 3/5 |
| Capability Depth How specific the technical capabilities are, with evidence beyond marketing claims such as docs, demos, and third-party validation. | 3/5 |
| Market Timing Whether the market is ready for this product, with evidence that buyers are actively seeking solutions. | 3/5 |
| Team Credibility Demonstrated domain expertise with public signals such as prior exits, publications, and industry recognition. | 3/5 |
| GTM Proof Evidence of actual traction (customers, revenue signals, partnerships) beyond stated intentions. | 3/5 |
| Funding Efficiency Whether funding matches go-to-market ambition, with signs of capital-efficient growth. | 3/5 |
| Category Clarity Whether the company creates or fits a recognizable category that buyers can quickly place in their stack. | 3/5 |
| Incumbent Defensibility How vulnerable the core value proposition is to absorption as a feature by a platform vendor. | 3/5 |
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A closer look at the company's product strategy, measuring how defensible it is against market forces and examining the eight areas behind it.
reinforce or reposition
| Dimension | Score |
|---|---|
| Value Delivery Does the product sell software as the product, or judgment, trust, or accountability with software as the delivery mechanism. | 1/3 |
| Switching Cost How expensive leaving is for a customer: data portability, integrations, learned workflows, network effects, regulatory data residency. | 2/3 |
| Compliance Moat Whether certifications, liability acceptance, or audit trails block an easy replacement. | 1/3 |
| Problem Complexity Whether the product requires ML, optimization, real-time systems, or years of specialized expertise. | 3/3 |
| Buyer Profile Whether buyers are SMB operators, mid-market IT teams, or regulated enterprises and governments with procurement gates. | 3/3 |
| Layer Whether the product is an end-user application, a platform with application features, or infrastructure other applications depend on. | 2/3 |
| Proprietary Data, Content, or IP Whether the product accumulates datasets, content licenses, or IP that a rival cannot recreate from scratch. | 1/3 |
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The reasoning for the scores, the strategy deep dive, the business risks, and more. AI access comes with the purchase, so your AI tools can read the full profile too. You keep 12 months of access.
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| Id | Source | Tier | Accessed |
|---|---|---|---|
| f1 | https://www.legionsecurity.ai | official | 2026-06-24 |
| f2 | SecurityWeek: Legion Emerges From Stealth With $38 Million in Funding | press | 2026-06-24 |
| f3 | FinSMEs: Legion Raises $38M in Seed and Series A Funding | press | 2026-06-24 |
| f4 | SiliconANGLE: Legion raises $38M to automate SOC workflows through browser-native AI | press | 2026-06-24 |
| f5 | Calcalist: Legion raises $30M Series A to train AI on how security teams work | press | 2026-06-24 |
| Id | Source | Tier | Accessed |
|---|---|---|---|
| s1 | Legion Security homepage “Grow your own AI SOC. Legion learns how your team works and scales that knowledge into agentic workflows that elevate your SOC. Born and raised in-org. A browser extension that grows your AI companion.” | official | 2026-06-24 |
| s2 | SecurityWeek: Legion Emerges From Stealth With $38 Million in Funding “Founded in 2024 by Microsoft Sentinel and Cambridge AI research alumni, New York City-based Legion has built a browser-native AI Security Operations Center (SOC) companion. The company has already seen adoption among Fortune 500 organizations in the energy, finance, and healthcare industries.” | press | 2026-06-24 |
| s3 | SiliconANGLE: Legion raises $38 million to automate SOC workflows through browser-native AI “Legion uses a three-phase operational model: a Learning Mode that shadows senior analysts, a Guided Mode that performs tasks under human supervision, and an Autonomous Mode. Analysts can restrict its access to certain tools and mask sensitive data during sessions.” | press | 2026-06-24 |
| s4 | Fortune via Yahoo: Cybersecurity upstart Legion emerges from stealth with $38 million “Legion is a security operations center (SOC) that uses AI to detect threats within users' computer browsers, different from SOC technologies like Palo Alto Networks, Microsoft Sentinel, and CrowdStrike. Legion already has dozens of customers including Fortune 20 companies.” | press | 2026-06-24 |
| s5 | Calcalist: Legion raises $30M Series A to train AI on how security teams work “Legion was founded in 2024 by security veterans Ely Abramovitch (CEO), Michael Gladishev (VP R&D), and Eyal Fisher (CTO). ... Legion currently employs 25 people split between Israel and New York.” | press | 2026-06-24 |
| s6 | Legion Security: Now Available on Google Cloud Marketplace “Legion Security Is Now Available on Google Cloud Marketplace, May 31, 2026. Powered by Google Cloud's Gemini models, each workflow is executed by AI agents. A large insurance organization automated 24,000 investigations and cut mean time to respond from 20 minutes to 2 minutes.” | official | 2026-06-24 |
| s7 | Crowdfund Insider: Legion Raises $38 Million, Emerges From Stealth “Legion claims to be the first of its kind to offer AI SOC as a browser extension. ... funding was led by Coatue, with participation from Accel and Picture Capital, along with investors from tech companies, like Google, Crowdstrike, and Wiz.” | press | 2026-06-24 |
| s8 | About Legion Security “Ely Abramovitch, Founder & CEO. Michael Gladishev, Founder & VP R&D. Eyal Fisher, Founder & CTO. Built Microsoft Sentinel. Ex-Cambridge, Pioneer in Gen AI. We knew real analyst behavior holds more value than any off-the-shelf playbook or pre-trained model.” | official | 2026-06-24 |
| s9 | FinSMEs: Legion Raises $38M in Seed and Series A Funding “Legion emerged from stealth with $38 million in Seed and Series A funding. The round was led by Coatue, with Accel and Picture Capital, plus angel investors from Google, Crowdstrike, and Wiz. The platform uses vision models and a lightweight browser extension to record analyst workflows.” | press | 2026-06-24 |
| s10 | Legion Security Trust Center (SafeBase) “Compliance: HIPAA, ISO/IEC 27001:2022, ISO/IEC 42001:2023, SOC 2 Type 2, CSA STAR Level 1. Featured Documents: SOC 2 Type 2, HIPAA, Pentest Report, ISO/IEC 42001:2023, ISO/IEC 27001:2022. HIPAA Report.” | official | 2026-07-08 |
| Id | Source | Tier | Accessed |
|---|---|---|---|
| s1 | Legion Security homepage “Legion has been transformative in our SOC, producing real-world, measured reduction in MTTI/R by 81% on our most common use case.” | official | 2026-07-08 |
| s2 | SecurityWeek: Legion Emerges From Stealth With $38 Million in Funding “The company has already seen adoption among Fortune 500 organizations in the energy, finance, and healthcare industries.” | press | 2026-07-08 |
| s3 | SiliconANGLE: Legion raises $38M to automate SOC workflows through browser-native AI “Legion uses a three-phase operational model that moves from passive observation to full automation.” | press | 2026-07-08 |
| s4 | Fortune via Yahoo: Cybersecurity upstart Legion emerges from stealth with $38 million “Legion already has dozens of customers that include a major financial institution and other "Fortune 20" companies, for whom Legion responds to threats 90% faster than existing players, according to Abramovitch.” | press | 2026-07-08 |
| s5 | Calcalist: Legion raises $30M Series A to train AI on how security teams work “Cybersecurity startup Legion Security has raised $30 million in a Series A funding round led by Coatue, with participation from Accel and Picture Capital, as well as senior angel investors from Wiz, Google, and CrowdStrike.” | press | 2026-07-08 |
| s6 | Legion Security: Now Available on Google Cloud Marketplace “Powered by Google Cloud's Gemini models, each workflow is executed by AI agents that reason through the evidence and provide a verdict and even remediate.” | official | 2026-07-08 |
| s7 | Crowdfund Insider: Legion Raises $38 Million, Emerges From Stealth “Legion claims to be the first of its kind to offer AI SOC as a browser extension.” | press | 2026-07-08 |
| s8 | About Legion Security “Ely Abramovitch, Founder & CEO. Michael Gladishev, Founder & VP R&D. Eyal Fisher, Founder & CTO. Built Microsoft Sentinel. Ex-Cambridge, Pioneer in Gen AI.” | official | 2026-07-08 |
| s9 | Legion Security Trust Center (SafeBase) “Compliance: HIPAA, ISO/IEC 27001:2022, ISO/IEC 42001:2023, SOC 2 Type 2, CSA STAR Level 1.” | official | 2026-07-08 |
| s10 | Legion Security engineering blog: IOC Chaos “Across 100 evaluation runs, it took JSON validity from ~80% to 100% and IOC reference compliance to 100%.” | official | 2026-07-08 |
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