Series A security startups

Swarming AI agents that take over the investigation work human SOCs cannot staff.

Raised $130M Series A led by Index Ventures, December 2025

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

Workload IAM that issues short-lived, secretless credentials for services, scripts, and AI agents.

Raised $25M Series A led by Acrew Capital, September 2024

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

Kubernetes-rooted CNAPP and CADR, built on CNCF Kubescape, that uses eBPF runtime to decide which CVEs and misconfigs matter.

Kubescape 4.0 released with runtime threat detection GA, March 2026

Cloud policy enforcement that blocks misconfigs and over-privilege at deploy time, before CSPM has anything to scan.

Raised $29M Series A, June 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

Reachability-aware AppSec now aimed at AI coding agents, IDEs, MCPs, and the packages they pull.

Raised $19M Series A led by KOMPAS VC, February 2026

Metadata lake DSPM that classifies petabyte estates in place, then governs AI access in plain language.

Raised $25M Series A led by Greylock, November 2025

Design-led product security agents that review PRDs, architecture, and specs before code exists.

Emerged from stealth with $36M seed and Series A, November 2025

Zero Trust for non-human identities: discover the secret, then make stolen static credentials useless.

Raised $20M Series A led by SignalFire, January 2025

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

MSSP-first agentic SOC that wires intel, hunting, detections, investigation, and response into one loop.

Raised $25M Series A led by SYN Ventures, January 2025

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

Machine identity provider for operational technology, factories, and defense networks that still run API keys.

Raised $18M Series A-1 led by SineWave Ventures, April 2025

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

One workforce graph over employees, AI agents, and other nonhuman identities, and what each can reach.

Emerged with a $25M Series A co-led by Sequoia and SMBC Fin Atlas Beyond Fund at a valuation above $100M, September 2026

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

Developer-first secrets platform that syncs env vars, rotates them, and logs who changed what.

Launched Change Requests for approved secret edits, October 2024

Self-serve DMARC, SPF, and DKIM platform for teams that need enforcement without a mail consultant.

Raised $20M Series A led by Radian Capital, September 2024

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

AI pentesting for APIs and web apps that proves exploitability, including IDOR and business logic, not just crawler noise.

Raised $18M to expand agentic pentesting for APIs and business logic, 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

Frontier-lab red teaming (Shade) and runtime defense (Cygnal) trained on unpublished attacks.

Raised $40M Series A co-led by Wing and Madrona, May 2026

ANSSI-certified French EDR for buyers who cannot put a US cloud agent on sensitive endpoints.

Added Attack Surface Management to its endpoint platform, September 2025

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

Open-source secrets manager you can self-host or run as SaaS, now adding agent-safe credential proxying.

Raised $16M Series A led by Elad Gil, June 2025

External attack-surface platform that discovers cloud, subsidiary, and supply-chain assets, then validates which exposures are actually exploitable.

Added $15M to Series A, bringing total funding to $50.3M, February 2024

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

Runtime-backed AppSec that proves a CVE is loaded in memory before it hits the backlog.

Published Rapyd case study showing runtime-led AppSec without extra headcount, July 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

AI-driven lineage of every component, including the ones hiding in firmware and public-sector stacks.

Raised $20M Series A co-led by Prosperity7, Neotribe, and Hitachi, July 2024

SBOM and AIBOM intelligence so you can actually use the bills of materials you generate.

Raised $15M Series A led by Ensemble VC, April 2025

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

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-native DLP and insider risk that classifies, then blocks exfil at the endpoint without a policy farm.

Raised $30M Series A seven months after stealth, June 2025

Attacker-style recon and automated red team for models, agents, IDEs, and the systems around them.

Raised $30M Series A led by Album VC, August 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

Firmware and binary SBOM that unpacks what vendors actually shipped, not what the datasheet claimed.

Raised $10M Series A, taking total funding to about $25M, April 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

Cloud IGA and PAM that answers who or what can touch production, then enforces it at runtime.

Closed $15M Series A led by SYN Ventures, September 2024

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

Agentic SOC platform covering investigation, hunting, and detection engineering in one mesh.

Raised $30M Series A led by Accel, July 2025

European agentic SOC that turns every alert investigation into posture insight.

Raised $30M co-led by Partech and Forgepoint Capital International, March 2026

Behavioral runtime CDR for Kubernetes and AI workloads, fingerprinting what a cluster should do so zero-days show up as drift.

Raised $14M Series A, February 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

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

Backports security patches onto the exact open-source versions you already run, including EOL.

Raised $13M Series A led by Vertex Israel, July 2025

Internet-scale IPv4/IPv6 discovery that maps what an attacker can actually see of you.

Launched new product capabilities for AI-driven attack-surface change, December 2025

AI purple team that replays CNAPP and SIEM findings against a digital twin to prove which cloud CVEs are actually weaponizable.

Named a CRN 2025 Stellar Startup for the third consecutive year, November 2025

Private CA and device identity so internal TLS, SSH, and laptops get short-lived certificates instead of passwords.

Published hardware-bound device identity essay, May 2026

Discover, adversarially test, and kill-switch AI agents and MCP connections in production.

Raised $64M Series A, taking total funding to $85M, June 2026

Human-plus-AI cloud remediation that closes CNAPP findings without breaking the workload that owns them.

Raised $12M Series A, September 2024

Agentic data security that classifies with business context and remediates without a ticket queue.

Raised $25M Series A led by M13, total funding $32.2M, November 2025

Machine-first identity security that finds every NHI, names an owner, and cuts leftover privilege.

Named to Rising in Cyber 2026 after a $20M Series A, May 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

Continuous trust tests so enterprise agents stay reliable after they leave the lab.

Raised $17M Series A led by BrightMind Partners, November 2025