Seed security startups

Context firewall for AI agent fleets: discovers agents, continuously vets the skills, plugins, and MCP servers they touch, and blocks what fails.

Emerged from stealth with $50M raised across two seed rounds led by Sequoia and Greenoaks, September 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

Pipelineless SAST, SCA, secrets, and IaC that scans every push and talks to the developer in Slack.

Shipped PR secrets scanning and secrets-in-HEAD detection, June 2026

Pipeline and package gates that block supply-chain junk before AI-written code swallows it.

Raised $4M and acquired SecureIQx and Korbit.ai, May 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

AI SAST that hunts broken auth and business-logic bugs, then writes a patch developers can merge.

Raised $2.6M seed led by Shorooq, with Y Combinator participating, November 2024

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

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

Customer identity workflows that let product teams ship login, MFA, and agent auth without an IAM rebuild.

Closed $35M seed extension, $88M total, September 2025

Outside-in autonomous hacker that discovers, exploits, and validates external exposure continuously.

Shipped Sense, Plan, Attack AI agents to operationalize CTEM, November 2025

Browser detection and response that watches behavior inside existing Chrome and Edge sessions.

Published The State of Browser Security Report 2026 from production telemetry

Need-to-know access control so Copilots, coding agents, and MCP tools stop oversharing.

Raised $11M to ship need-to-know controls for enterprise AI, March 2025

Discovery, posture, automated red team, and gateway runtime for models and agents.

Published Securing Agentic AI: The Intent Security Framework, March 2026

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

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

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

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

Inventory, agentic red team, and self-improving runtime guardrails for the agent lifecycle.

Named a 2026 Gartner Cool Vendor in AI Software Security

Agentic AppSec that triages scanner noise and opens mergeable fix PRs in your house style.

Raised $15M seed led by Decibel and Wing VC, May 2025

MCP gateway plus identity, observability, and threat detection for enterprise agents.

Emerged from stealth with $11M seed from Khosla (Keith Rabois) and Felicis, November 2025

Self-improving AI SOC that unifies defense, hunting, and offense on one agent family.

Named to the CB Insights AI 100, May 2026, after 15x customer growth in 2025

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 pentest platform with a human in the loop across web, API, network, and AI surfaces.

Raised $8M (Q2 2025) to scale agentic continuous pentesting

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

Agentless identity fabric for human, machine, and AI identities across hybrid cloud and on-prem.

Raised $5M seed led by VentureFriends and DFF Ventures, April 2025

SCA plus malware and pipeline security for teams whose code is increasingly written by agents.

Won Global Infosec awards for ASPM and GenAI application security, 2026

AI-native SAST for business logic, auth bypasses, and chained exploit paths, with generated patches.

Named an RSAC 2026 Innovation Sandbox Top 10 finalist