New security startups

Autonomous offensive security platform that finds the attack paths an AI-enabled adversary would use, exploits them under approval, and drives fixes through ITSM.

Emerged from stealth with $37M from Lightspeed Venture Partners and Cyberstarts, June 2026

AI-native cyber defense platform whose agents handle exposure analysis, detection, investigation and response on top of a security team's existing tools, also offered as managed MDR.

Raised a $7M seed round led by Blumberg Capital, January 2026

Offensive security platform that sends swarms of AI attacker agents against an organization's attack surface to exploit weaknesses and chain them into validated attack paths.

Raised a $255.5M Series B co-led by Andreessen Horowitz and Accel at a valuation above $2.5B, October 2026

AI-native exposure management that models the enterprise network to isolate reachable, exploitable vulnerabilities and produce environment-specific remediation plans.

Raised a $25M Series A led by Index Ventures, following a $10M seed led by Team8, February 2026

Runtime security for AI agents that watches their reasoning and actions, then blocks manipulation, risky tool calls and data exfiltration before they complete.

Came out of stealth with a $7M seed round led by Lama Partners and Forgepoint Capital International, April 2026

Agentic vulnerability management that investigates findings, identifies system owners, ranks risk in business context and drives remediation through existing team workflows.

Raised a $42M Series A led by Bain Capital Ventures, February 2026

AI SOC investigation platform that triages and investigates alerts autonomously or alongside analysts, covering Tier-1 to Tier-3 work across identity, endpoint, cloud and SaaS.

Came out of stealth with a $21M seed round led by Andreessen Horowitz, July 2024

Security platform that embeds guardrails inside AI coding agents such as Cursor, Claude Code and Codex, preventing vulnerabilities while code is being generated.

Raised a $25M Series A led by Felicis at a $200M valuation, March 2026

Agent-native SIEM and AI SOC that stores and searches logs, runs Python detections, and investigates alerts with agents the security team defines and controls.

Raised a $7.4M seed round led by Andreessen Horowitz, March 2026

Autonomous AI agents that investigate every security alert and threat advisory using an organization's own tools and data, deployed on-premises, in private cloud or air-gapped.

Launched with $30M, a $25M Series A led by Menlo Ventures plus a $5M seed led by Tola Capital, March 2025

Managed detection and response service in which AI agents monitor, triage, investigate and start remediation while human analysts make the higher-level calls.

Raised a $33M Series A led by Craft Ventures, November 2025

Applied AI security lab whose agents find and fix weaknesses across code, dependencies, secrets and running applications for software engineering and security teams.

Raised an $80M Series B led by Meritech Capital, March 2026

Security and governance platform that discovers the AI agents running across an enterprise, records how they behave, scores their risk and constrains them at runtime.

Raised a $30M Series A led by Balderton Capital, May 2026

Governs how employees and AI agents use AI tools, classifying each interaction with small language models and stopping sensitive data from leaking without banning AI outright.

Raised a $50M Series B led by Crosspoint Capital Partners, October 2026

Identity and access management for AI agents, replacing static secrets and API keys with short-lived, task-scoped tokens issued at runtime for teams running agents in production.

Came out of stealth with $38M across an $8M seed co-led by Andreessen Horowitz and Boldstart Ventures and a $30M Series A led by Acrew Capital, October 2025

Browser-native AI SOC analyst that learns how a security team actually investigates alerts through a browser extension, then automates those workflows with or without supervision.

Came out of stealth with $38M in seed and Series A funding, with the Series A led by Coatue, July 2025

Network-level control over how employees and autonomous agents use AI tools, assessing each interaction's risk and enforcing policy in real time without endpoint changes.

Raised an $18M seed round led by Team8, December 2025

AI agents that investigate cloud and code vulnerabilities, reproduce attacker steps to confirm which are exploitable, and drive the fixes for security teams.

Raised a $25M Series A led by Theory Ventures, June 2025

AI penetration testing platform for mid-size and large enterprises that hunts business-logic flaws, validates exploits and automatically retests fixes across web, mobile and APIs.

Emerged from stealth with $51.5M across seed ($8.5M), Series A ($33M) and venture debt ($10M), January 2026

Agentic exposure management for enterprises that groups vulnerabilities, ranks them by exploitability, assigns owners and turns each remediation decision into a reusable rule.

Launched with an $11M seed round led by Hetz Ventures and Brightmind Partners, March 2026

Monitors and secures the AI coding assistants, autonomous agents and employee-built apps inside enterprises, so security teams can manage the risk instead of blocking the tools.

Came out of stealth with $42M in total funding, including a round of about $34M led by Jump Capital, October 2026

Agentic product security platform that reviews planned features for design risk before code is written, then guides and verifies the fixes engineering delivers.

Raised a $20M Series A led by Scale Venture Partners, December 2025

Autonomous exposure remediation platform whose AI Security Engineer removes exploitable paths and predicts business impact before any fix is applied.

Raised a $20M Series A led by Acrew Capital, March 2026

Device posture management that finds misconfigurations across endpoints, servers and AI tooling and fixes them autonomously, with instant rollback.

Raised $65M in its first-ever funding round led by Bessemer Venture Partners, September 2025

Autonomous offensive security agent that continuously attacks live applications and infrastructure to find exploitable, chained vulnerabilities for engineering and security teams.

Raised a $40M round led by Khosla Ventures, March 2026

Exposure management and remediation operations platform that consolidates findings across security tools, prioritizes real risk and routes fixes to the right teams.

Raised a $50M Series B led by Sienna Venture Capital, August 2025

Agentic platform that builds a business context graph from security, identity, IT and HR signals, then prioritizes and closes exposure gaps with human oversight.

Launched with $57M in funding led by Accel, March 2026

Secure code generation agent that wraps AI coding in policy checks, verification and automatic remediation so developers receive code that meets security rules.

Raised a $10M seed round led by Alven and Drysdale and launched Symbiotic Code, January 2026

Autonomous AI pentesting for enterprises: agents that discover, chain and exploit application vulnerabilities continuously, then guide and retest the fixes.

Emerged from stealth with a $75M seed round led by Greylock, Battery Ventures and Lux Capital, November 2025

Agentic security platform that reads code, infrastructure, configurations and AI agents together, prioritizes real attack chains, and verifies each fix, for teams shipping agents quickly.

Came out of stealth with a $13M seed round led by LocalGlobe and Cambridge Innovation Capital, April 2026

AI-native security operations platform that runs detection, triage and threat hunting directly where data already lives, so SOC teams avoid centralizing logs into a SIEM.

Raised a $120M Series B led by Accel, February 2026

Autonomous offensive security platform that runs real attacks against applications to find vulnerabilities and proves each one through exploitation, for security teams testing continuously.

Raised a $120M Series C led by DFJ Growth and Northzone in March 2026, then added a $35M extension, May 2026

Composable security operations platform that runs detections on data in motion and lets teams pick their own storage and SIEM back end.

Raised $25M in a round co-led by Cheyenne Ventures and AVP, July 2026

Agentic email security for Microsoft 365 and Google Workspace that judges the intent behind a message instead of matching known scam patterns.

Raised a $36M Series A led by Battery Ventures, July 2026

Seoul-based AI red teaming and guardrail company testing language models, agents, and physical AI systems for exploitable behavior.

Closed a KRW 10 billion Series A led by Samsung Venture Investment, April 2026

Assurance and insurance company for AI agents: it audits agents against its AIUC-1 standard and writes insurance tied to the audit results.

Raised a $40M Series A led by Ribbit Capital, September 2026

AI safety and security company (formerly ActiveFence) that red teams models and runs guardrails for AI labs and enterprises.

Raised $140M led by Apax Digital Funds, August 2026

Third-party cyber risk intelligence: rates and monitors vendors from outside-in data, flags which ones a new breach or vulnerability touches, and estimates the financial exposure.

Released an MCP server that exposes its third-party cyber risk platform to AI agent workflows, February 2026

Defensive cybersecurity AI lab training its own foundation model to power agents that work inside security teams.

Raised a $60M seed round led by Sequoia Capital, August 2026

Security data pipeline that collects, trims, enriches, and routes telemetry before it reaches the SIEM or data lake.

Raised a $40M Series B led by Insight Partners, July 2026

Exposure management that predicts which vulnerabilities will be exploited, using a global model plus one trained on each customer's environment.

Raised a $25M Series A led by Brightmind Partners, July 2026

Runtime security built into the firmware of connected devices, robots, and other physical AI, plus build-time firmware analysis mapped to the EU CRA.

Raised $270M at a $1.7B valuation in a round led by Headline, September 2026

AI agents that inventory everything running on employee devices, judge it against company policy, and remove or block what fails.

Emerged from stealth with $180M across seed, Series A, and a Series B led by Sequoia, Cyberstarts, Greenoaks, and Redpoint, July 2026

Identity and access for AI agents: discovers them, ties each to a human owner, and swaps standing credentials for just-in-time access per action.

Raised a $30M Series A with Akamai as strategic investor, alongside Battery Ventures and YL Ventures, July 2026

Detection and response for AI agents on employee endpoints: maps what each agent touches, baselines its behavior, and stops the ones that go rogue.

Raised an $8M seed round led by Costanoa Ventures, March 2026

AI SOC that builds a per-company context graph first, then triages, investigates, and responds to alerts with a human approving actions.

Raised a $35M Series A led by Canaan Partners, July 2026

Deepfake voice and voice fraud detection for live calls, analyzing the audio itself to flag cloned voices, vishing, and caller impersonation.

Raised $25M led by Future Ventures, September 2026

Endpoint sensor that inventories AI agents, MCP servers, and extensions on employee machines and enforces allow, block, or approve policies on their actions.

Emerged from stealth with $100M, including a $75M Series A led by Andreessen Horowitz and Bessemer Venture Partners, July 2026

One identity platform for human, machine, and AI agent identities that compares granted access with real use and drives remediation continuously.

Emerged from stealth with a $60M seed round co-led by Accel, Greylock, and CRV, July 2026

Control plane for enterprise AI agents: finds sanctioned and shadow agents, watches what they try to do, and blocks harmful actions before they run.

Raised a $113M Series B led by Bessemer Venture Partners, July 2026

Third-party cyber risk platform that combines external attack surface scans with supplier questionnaires, now with a module that prices supplier risk in dollars.

Launched Cyber Risk Quantification to put a dollar value on supplier cyber risk, August 2026

Runtime security for the AI agents enterprises build themselves, using a sidecar that records and polices agent actions inside the customer's own cloud.

Raised a $25M Series A co-led by Glilot Capital and Sienna Venture Capital, October 2026

Supplier security as a shared network: each supplier keeps one security profile that every connected customer can see, instead of answering questionnaires one by one.

Raised a GBP 24M Series B led by Axiom Equity, July 2026

Cyber risk platform that started in vendor risk and now covers a company's own attack surface and workforce shadow AI use from one console.

Raised a $75M Series C led by Springcoast Partners, February 2026

Control architecture that runs sensitive AI and high-consequence workloads in customer-controlled, compartmentalised environments, including on hyperscaler clouds.

Raised a $50M Series A led by New Enterprise Associates, July 2026