The Agent Stack: Security & Control

36 Companies 5 Categories The Agent Stack

The OpenAI and Hugging Face incident showed that autonomous agents cannot be trusted to report or police their own behavior. As agents gain more authority, companies will need an independent control and evidence layer around them. This landscape focuses on new pure play companies building that layer rather than established security platforms expanding into agent security.

Filter and ordering

Category

Tool & MCP Security

6 companies

Agents increasingly rely on external tools to act. These products provide an independent control layer that decides which MCP servers or tools an agent is allowed to use.

AIR

air.security

AIR builds a security platform that sits between AI agents and the outside world to inspect and control the skills, MCP servers, plugins, and other add ons they use.

11-50 employees Employees Seed Stage 2026 Founded
Trajectory Maturity Level Emerging

Confidence: High

Anomity

anomity.ai

Anomity is an enterprise security platform that gives teams visibility and policy control over AI agents, MCP servers, and related tools running on managed endpoints.

1-10 Employees Pre Seed Stage 2026 Founded
Trajectory Maturity Level Early

Confidence: Medium

Lasso Security

lasso.security

Lasso Security builds an AI security platform that discovers, scores, monitors, and controls AI agents and their MCP tool connections so enterprises can use them more safely.

51-200 employees Employees Seed Stage 2023 Founded
Trajectory Maturity Level Proven

Confidence: High

Operant AI

operant.ai

Operant AI builds a runtime security platform that protects AI applications, agents, APIs, and MCP use in real time.

11-50 employees Employees Series A Stage 2021 Founded
Trajectory Maturity Level Emerging

Confidence: Medium

Pillar Security

pillar.security

Pillar Security builds an AI security platform that helps enterprises discover, test, and control the risks around AI agents and tools in production.

11-50 employees Employees Seed Stage 2023 Founded
Trajectory Maturity Level Emerging

Confidence: Medium

NeuralTrust

neuraltrust.ai

NeuralTrust builds a security platform that controls and monitors AI agents, their tool calls, and MCP connections so enterprises can govern what agents are allowed to access and do.

51-200 Employees Seed Stage 2022 Founded
Trajectory Maturity Level Proven

Confidence: High

Category

Agent Runtime & Execution Security

18 companies

Approved tools can still be used in unsafe ways. These products provide an independent control layer around execution and stop actions that break policy before they affect external systems.

HiddenLayer

hiddenlayer.com

HiddenLayer is an AI security company that protects enterprise AI models and agentic applications from malicious actions and model attacks. ([hiddenlayer.com](https://www.hiddenlayer.com/about-us?utm_source=openai))

51-200 employees Employees Series B Stage 2022 Founded
Trajectory Maturity Level Established

Confidence: High

CodeIntegrity

codeintegrity.ai

CodeIntegrity builds secure runtime controls for AI agents, letting enterprises inspect, constrain, approve, and audit tool calls before they reach production systems.

small Employees Seed Stage 2024 Founded
Trajectory Maturity Level Early

Confidence: Medium

Manifold

manifold.security

Manifold provides runtime security and detection and response for AI agents on endpoints, showing what agents do at runtime and stopping risky actions before they affect external systems.

11-50 Employees Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Capsule Security

capsulesecurity.io

Capsule Security is a runtime security platform for AI agents that monitors behavior in real time and blocks unsafe actions before they are executed.

11-50 Employees Seed Stage 2025 Founded
Trajectory Maturity Level Emerging

Confidence: Medium

Noma Security

noma.security

Noma Security is an enterprise AI security platform that helps companies discover, govern, test, and protect AI applications and agents at runtime.

51-200 employees Employees Series B Stage 2023 Founded
Trajectory Maturity Level Proven

Confidence: High

Straiker

straiker.ai

Straiker builds security software that discovers, tests, and controls AI agents at runtime so unsafe actions can be blocked before they affect external systems.

51-200 employees Employees Series A Stage 2024 Founded
Trajectory Maturity Level Proven

Confidence: High

WitnessAI

witness.ai

WitnessAI is an enterprise AI security platform that gives companies visibility, policy control, and runtime protection for AI usage, including agents and tools.

51-200 employees Employees Series B Stage 2023 Founded
Trajectory Maturity Level Proven

Confidence: High

Evoke Security

evokesecurity.com

Evoke Security builds a security platform that gives enterprises visibility, policy control, and real time protection for AI agents.

2 to 10 employees Employees Pre Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Quint Security

quintai.dev

Quint Security builds runtime behavioral security for AI agents. It watches what an agent actually does on the host and network, then blocks or flags actions that violate policy before they reach external systems.

1-10 Employees Unknown Stage Unknown Founded
Trajectory Maturity Level Early

Confidence: Medium

NOFire

nofire.ai

NOFire builds a runtime control layer for AI agents in production, using a live production model to gate actions and prevent unsafe changes before they reach external systems.

11 to 50 Employees Seed Stage 2024 Founded
Trajectory Maturity Level Emerging

Confidence: Medium

AI Score

aiscore.ai

AI Score builds an AI governance platform that monitors AI use across an organization and turns it into live controls, risk insight, and prioritized action.

2-10 Employees Pre Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Eve Security

eve.security

Eve Security builds a runtime security and policy enforcement layer for agentic AI so enterprises can monitor, control, and block unsafe agent actions before they affect business systems.

1-10 Employees Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Kontext

kontext.security

Kontext builds runtime control and authorization software for AI agents. It checks each agent action against policy before the action executes and keeps an audit trail for security teams.

unknown Employees Seed Stage 2025 Founded
Trajectory Maturity Level Nascent

Confidence: Medium

Outerlimit

outerlimit.com

Outerlimit builds a security and authorization layer for agentic AI that enforces policy at tool execution time.

unknown Employees Pre Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Goodfire

goodfire.com

Goodfire builds AI interpretability tools that help teams understand, monitor, and control model behavior before it causes unsafe outcomes.

unknown Employees Series B Stage 2024 Founded
Trajectory Maturity Level Emerging

Confidence: Medium

Rein Security

reinsec.io

Rein Security builds a runtime security platform for enterprise AI agents and applications that watches actions as they happen and blocks unsafe behavior before it reaches external systems.

31 employees (reported Oct 2026) Employees Series A Stage 2024 Founded
Trajectory Maturity Level Emerging

Confidence: Medium

Pluto Security

pluto.security

Pluto Security builds an AI security platform that gives companies visibility and real time guardrails around employee used AI tools, agents, connectors, and related workflows before risky actions reach external systems.

40 employees Employees Series A Stage 2025 Founded
Trajectory Maturity Level Emerging

Confidence: High

Harbor

harbor.ai

Harbor builds software and insurance products that help companies measure, mitigate, and insure the risks introduced by AI agents.

unknown Employees Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Category

Agent Testing & Assurance

4 companies

Some agent failures only appear when the system is pushed into difficult situations. These products test agents independently to expose dangerous behavior before it reaches production.

Gray Swan

grayswan.ai

Gray Swan is an AI security company that tests AI models and agents for unsafe behavior before and during deployment.

11-50 employees Employees Series A Stage 2023 Founded
Trajectory Maturity Level Emerging

Confidence: High

Giskard

giskard.ai

Giskard builds software that tests and red teams AI agents and LLM applications before production, with a focus on finding security, reliability, and quality failures.

11-50 Employees Seed Stage 2021 Founded
Trajectory Maturity Level Emerging

Confidence: High

Verno Labs

vernolabs.ai

Verno Labs builds offensive security tools that test AI agents for vulnerabilities before they reach production.

2 to 10 employees Employees Pre Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Trent AI

trent.ai

Trent AI builds an agentic security platform that scans code, cloud systems, and AI agents to find risk, propose fixes, and verify that those fixes landed before production.

2-10 employees Employees Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Category

Agent Observability & Evidence

6 companies

Control is not enough if the evidence comes from the agent itself. These products create an independent record of execution so teams can verify what the agent actually did.

Paper Compute

papercompute.com

Paper Compute builds agent telemetry and evidence tools that capture what AI agents actually did, so teams can search, replay, audit, and reuse real sessions.

1-10 Employees Unknown Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Fact0

fact0.io

Fact0 provides a tamper evident audit layer for AI agents that records tool use and execution history so teams can prove what an agent actually did.

1-10 Employees Unknown Stage 2026 Founded
Trajectory Maturity Level Early

Confidence: Medium

Vaara

vaara.io

Vaara builds software that sits in front of AI agents, gates each tool call, and writes a tamper evident execution record so teams can verify what the agent actually did. ([vaara.io](https://vaara.io/?utm_source=openai))

1-10 employees Employees Bootstrapped Stage 2026 Founded
Trajectory Maturity Level Early

Confidence: Medium

Agnys

agnys.net

Agnys is an evidence and observability layer for AI agents that records model calls, tool use, file edits, approvals, and other side effects into a tamper evident session history for review and compliance.

1-10 employees Employees Unknown Stage Unknown Founded
Trajectory Maturity Level Nascent

Confidence: Low

Tenet AI

tenetai.dev

Tenet AI builds an auditability platform for AI agents that records decisions, reasoning, and execution evidence for regulated teams.

11-50 Employees Unknown Stage 2026 Founded
Trajectory Maturity Level Early

Confidence: Medium

Raindrop

raindrop.ai

Raindrop is a platform that monitors AI agents in production, traces what they actually do, and helps teams detect failures, investigate root causes, and test fixes before rollout.

<20 Employees Series A Stage 2023 Founded
Trajectory Maturity Level Proven

Confidence: High

Category

Agent Identity & Authorization

2 companies

Infrastructure that establishes the identity and provenance of agents and determines what they are permitted to access or do before execution.

Beltic

beltic.com

Beltic builds verification infrastructure for AI agents so businesses can verify who an agent is and decide what it is allowed to do before it acts.

small team (no numeric count established) Employees Seed Stage 2025 Founded
Trajectory Maturity Level Early

Confidence: Medium

Runlayer

runlayer.com

Runlayer builds a control plane for enterprise AI agents, with an MCP gateway, runtime security, policy controls, and audit visibility for the tools agents use.

11-50 Employees Series A Stage 2025 Founded
Trajectory Maturity Level Proven

Confidence: High

Investors

Top-tier and active investors

Top-tier investors who invested

Did not invest

A16Z logo
a16z crypto logo
Accel logo
Insight Partners logo
Benchmark logo
General Catalyst logo
Index logo
Balderton logo
Atomico logo
Point Nine Capital logo
Creandum logo

Other investors

Funding & Exits

Oct 2026

Harbor

Seed

$10M • Investors: Base10, Abstract, 8VC, Restive, NFX, Innovation Endeavors, Kibo Ventures, Masia, MVP Ventures

AI needs clear liability

Pluto Security

Series A

$34M • Investors: Jump Capital, Skinos, Ansa Capital, other angel investors

TechCrunch

Pluto Security

Seed

$8.5M • Investors: TLV Partners, Armis founders

TechCrunch

Rein Security

Series A

$25M • Investors: Glilot Capital, Sienna Venture Capital, Corner Ventures, Atlacle, RNP Capital Advisors

PR Newswire
Sep 2026

Beltic

Seed

$7.3M • Investors: Norwest Ventures, Oxford Seed Fund, Restive Ventures, angels and advisors including Melissa Strait, Max Freeman, and Patrick Sigrist, Collide Capital

Beltic blog

Raindrop

Series A

USD • Investors: CRV, Anthropic, OpenAI, Thinking Machines

www.raindrop.ai

Eve Security

seed extension

$4.5M • Investors: Run Ventures, Dreamit Ventures, Blu Ventures, LiveOak Ventures

Eve Security blog

AI Score

Seed

EUR 4.6M • Investors: Fuel Ventures, GALLOS Technologies, Robert Mann, Mo El Husseiny, Alan Morgan

www.eu-startups.com

AI Score

Seed

$5.4M • Investors: Fuel Ventures, GALLOS Technologies, Alan Morgan, Mo El Husseiny, Robert Mann

Yahoo Finance / Sky News

Lasso Security

Funding round

$30M • Investors: ClearSky, Entrée Capital, iAngels, Singtel Innov8, Mindset, Swish Data

GlobeNewswire

HiddenLayer

Series B

$100M • Investors: Delta-v Capital, Ten Eleven Ventures, Morgan Stanley, M12, Microsoft's Venture Fund, Booz Allen Ventures

PR Newswire
Jun 2026

Straiker

Series A

$64M • Investors: Marathon Management Partners, Citi Ventures, Illuminate Financial, Workday Ventures, Bain Capital Ventures, Lightspeed, GTM Capital, Rain Capital, Neva SGR, Firebolt Ventures, Sixty Degree Ventures

Straiker official company blog

Runlayer

Series A

$30M • Investors: Felicis, Khosla Ventures

Runlayer blog

NeuralTrust

Seed

$20M • Investors: Alstin Capital, VentureFriends, Seaya, Kibo Ventures, Banc Sabadell, EA Ventures Plug and Play Fund, Finaves

NeuralTrust
May 2026

Gray Swan

Series A

$40M • Investors: Wing Venture Capital, Madrona, Obvious Ventures, Snowflake Ventures, Hudson River Trading, Samsung Next, Magarac Venture Partners

Gray Swan

NOFire

Seed

$2.5M • Investors: Marathon Venture Capital, a16z venture scout fund

NOFire AI newsroom
Apr 2026

Trent AI

Seed

$13M • Investors: LocalGlobe, Cambridge Innovation Capital, Joaquin Quiñonero Candela, Avinash Bhat, Ippokratis Pandis, Tony Jebara, Yaniv Altshuler, Praveen Mandal, Alexander Sainty

Trent AI
Mar 2026

Manifold

Seed

$8M • Investors: Costanoa Ventures, Cherry Ventures, Rain Capital, Modern Technical Fund, Joe Sullivan, Vijay Bolina

Official funding announcement
Feb 2026

Goodfire

Series B

$150M • Investors: B Capital, Juniper Ventures, DFJ Growth, Salesforce Ventures, Menlo Ventures, Lightspeed Venture Partners, South Park Commons, Wing Venture Capital, Eric Schmidt, other investors

Goodfire
Jan 2026

Rein Security

Seed

$8M • Investors: Glilot Capital, Ofer Ben-Noon, Amir Jerbi, Yoav Alon

PR Newswire

WitnessAI

Strategic financing

$58M • Investors: Sound Ventures, Fin Capital, Qualcomm Ventures, Samsung Ventures, Forgepoint Capital Partners

official funding announcement
Dec 2025

Raindrop

Seed

$15M • Investors: Lightspeed, Figma Ventures, Vercel Ventures, Amjad Masad, Michele Catasta, Walden Yan, Koen Bok, Jorn van Dijk, Andrew Hsu, Akshay Kothari, YC

Raindrop blog
Nov 2025

Runlayer

Seed

$11M • Investors: Khosla Ventures, Felicis

TechCrunch

Beltic

Pre-Seed

$1.4M • Investors: Collide Capital, Latitud, Positive Ventures, other angels

Beltic blog

AI Score

Pre-Seed

GBP 750K • Investors: GALLOS Technologies

Soapbox VC
Oct 2025

NeuralTrust

Grant

EUR 2.4M • Investors: European Innovation Council

CORDIS
Sep 2025
Jul 2025

Noma Security

Series B

$100M • Investors: Evolution Equity Partners, Ballistic Ventures, Glilot Capital

Noma Security blog
Jun 2025

Noma Security

Strategic investment

Investors: Silicon Valley CISO Investments

GlobeNewswire
Apr 2025

Goodfire

Series A

$50M • Investors: Menlo Ventures, Lightspeed Venture Partners, Anthropic, B Capital, Work-Bench, Wing, South Park Commons, other investors

Goodfire

Pillar Security

Seed

$9M • Investors: Shield Capital, Golden Ventures, Ground Up Ventures, strategic angels

Pillar Security blog
Mar 2025
Oct 2024

Noma Security

Series A

$25M • Investors: Ballistic Ventures, Glilot Capital Partners, strategic investors

Noma Security blog
Sep 2024

Operant AI

Series A

$10M • Investors: SineWave Ventures, Felicis, Alumni Ventures, Massive, Calm Ventures, Gaingels, industry-expert angels

GlobeNewswire
Aug 2024

Goodfire

Seed

$7M • Investors: Lightspeed Venture Partners, Menlo Ventures, South Park Commons, Work-Bench, Juniper Ventures, Mythos Ventures, Bluebirds Capital, angels

Business Wire

Gray Swan

Seed

$5.5M • Investors: friends and family, nontraditional investor, organizations focused on AI safety and security

Pittsburgh Post-Gazette
Jul 2024

Giskard

grant

EUR 3M • Investors: Bpifrance / France 2030

Giskard
May 2024
Feb 2024
Jan 2024
Nov 2023
Sep 2023

HiddenLayer

Series A

$50M • Investors: M12, Moore Strategic Ventures, Booz Allen Ventures, IBM Ventures, Capital One Ventures, Ten Eleven Ventures

PR Newswire
Aug 2023

Giskard

grant

EUR 2.5M • Investors: European Commission / EIC Accelerator

CORDIS
Jul 2023

Giskard

grant

EUR 500K • Investors: Bpifrance / France 2030

Giskard
Dec 2022

Giskard

Seed

EUR 1.5M • Investors: Elaia, Bessemer Venture Partners, Julien Chaumond, Oscar Salazar, Christine Balagué, Nathalie Gaveau, Charles Gorintin, Nick Hernandez, Vincent Huguet, Shéhérazade Semsar de Boisséson, Chris Schagen, Victor Coisne

Giskard closes its first financing round
Jul 2022

HiddenLayer

Seed

$6M • Investors: Ten Eleven Ventures

PR Newswire

On mobile, only the 10 most recent funding and exit groups are shown.

Activity

Recently added to this landscape

Last updated

Harbor builds software and insurance products that help companies measure, mitigate, and insure the risks introduced by AI agents.

Agent Runtime & Execution Security

Pluto Security builds an AI security platform that gives companies visibility and real time guardrails around employee used AI tools, agents, connectors, and related workflows before risky actions reach external systems.

Agent Runtime & Execution Security

Rein Security builds a runtime security platform for enterprise AI agents and applications that watches actions as they happen and blocks unsafe behavior before it reaches external systems.

Agent Runtime & Execution Security

Goodfire builds AI interpretability tools that help teams understand, monitor, and control model behavior before it causes unsafe outcomes.

Agent Runtime & Execution Security

Outerlimit builds a security and authorization layer for agentic AI that enforces policy at tool execution time.

Agent Runtime & Execution Security

Kontext builds runtime control and authorization software for AI agents. It checks each agent action against policy before the action executes and keeps an audit trail for security teams.

Agent Runtime & Execution Security

Eve Security builds a runtime security and policy enforcement layer for agentic AI so enterprises can monitor, control, and block unsafe agent actions before they affect business systems.

Agent Runtime & Execution Security

Raindrop is a platform that monitors AI agents in production, traces what they actually do, and helps teams detect failures, investigate root causes, and test fixes before rollout.

Agent Observability & Evidence

Market analysis

Who Watches the Agents?

An analysis of the emerging AI agent control layer, covering startups that secure agent tools, control runtime behavior, test agents before deployment and keep an independent re...

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