# AI security companies: 16 verified, updated October 19, 2026

Started October 19, 2026 · Updated October 19, 2026 · Presspool · https://presspool.ai/niches/ai-security

Presspool has verified 16 AI security companies. In its latest weekly sample of AI answers, through October 19, 2026, the ones AI apps named or cited most were [HiddenLayer](https://presspool.ai/companies/hiddenlayer-com) (27 of 53 answers), [Mindgard](https://presspool.ai/companies/mindgard-ai) (22 of 53 answers) and [Zenity](https://presspool.ai/companies/zenity-io) (15 of 53 answers). 7 of them announced a round in the last six months, most recently [Opsin](https://presspool.ai/companies/opsinsecurity-com) ($21 million, October 15, 2026). The 7 whose latest round was announced in dollars raised $173 million in those rounds.

Companies whose main product secures AI: security and governance for AI agents and the apps and models behind them, runtime control of what agents can do, and red teaming of AI systems. Each entry is taken from the company's own website and confirmed by an independent source, both linked on the entry. No company pays to be listed.

| Company | What it does | Latest announced financing |
| --- | --- | --- |
| [Reco](https://presspool.ai/companies/reco-ai) | Reco's AI agent security platform shows every AI agent in an environment, who owns it, what it can access and where the risk is. | $55 million, round type not disclosed (September 29, 2026) |
| [Harmonic Security](https://presspool.ai/companies/harmonic-security) | Harmonic Security governs how a workforce uses AI: it detects shadow AI, prevents data leaks and coaches employees across web, desktop and agentic workflows. | $50 million, Series B (October 14, 2026) |
| [Rein](https://presspool.ai/companies/reinsec-io) | Rein is a runtime security platform that discovers and secures every AI agent, MCP server and AI app an enterprise runs. | $25 million, Series A (October 8, 2026) |
| [Opsin](https://presspool.ai/companies/opsinsecurity-com) | Opsin's AI agent security platform discovers agents and maps their intent, identity, data and access so teams can resolve risks at the source. | $21 million, round type not disclosed (October 15, 2026) |
| [Outerlimit](https://presspool.ai/companies/outerlimit-com) | Outerlimit discovers, observes and enforces policy across every AI agent in an enterprise at runtime. | $16 million, Pre-seed (September 22, 2026) |
| [Kontext](https://presspool.ai/companies/kontext-security) | Kontext is a runtime security platform that sits between AI agents and the systems they use, checking each action against security policy. | $4 million, round type not disclosed (September 24, 2026) |
| [Palma.ai](https://presspool.ai/companies/palma-ai) | Palma.ai is the enterprise governance layer for MCP servers and agent skills, with policy, approval and audit. | $1.8 million, Pre-seed (September 23, 2026) |
| [Giskard](https://presspool.ai/companies/giskard-ai) | Giskard is an AI red teaming and LLM security platform that continuously tests AI agents for vulnerabilities. | Not found |
| [HiddenLayer](https://presspool.ai/companies/hiddenlayer-com) | HiddenLayer is an end-to-end AI security platform that detects threats to AI and protects models, agents and AI applications. | Not found |
| [Lasso Security](https://presspool.ai/companies/lasso-security) | Lasso's AI security platform gives enterprises visibility, control and protection across AI models, agents and apps. | Not found |
| [Mindgard](https://presspool.ai/companies/mindgard-ai) | Mindgard discovers, assesses and red teams AI models, agents and applications. | Not found |
| [Noma Security](https://presspool.ai/companies/noma-security) | Noma Security is an agent security and governance platform for enterprise security teams. | Not found |
| [Pillar Security](https://presspool.ai/companies/pillar-security) | Pillar Security is one platform to discover, govern and secure every AI agent and AI workflow across an organization. | Not found |
| [Straiker](https://presspool.ai/companies/straiker-ai) | Straiker is an agentic AI security company detecting prompt injection, tool misuse and runtime attacks across AI agents. | Not found |
| [WitnessAI](https://presspool.ai/companies/witness-ai) | WitnessAI is an AI security and governance platform that lets enterprises observe, control and protect employee and agent use of AI. | Not found |
| [Zenity](https://presspool.ai/companies/zenity-io) | Zenity is an AI agent security and governance platform that evaluates every agent action in real time. | Not found |

## AI security startups that raised funding recently

Rounds announced in the six months to October 19, 2026, newest first. Each links the company's record and its sources.

- [Opsin](https://presspool.ai/companies/opsinsecurity-com): $21 million, round type not disclosed, announced October 15, 2026, led by SYN Ventures and Race Capital.
- [Harmonic Security](https://presspool.ai/companies/harmonic-security): $50 million, Series B, announced October 14, 2026, led by Crosspoint Capital Partners.
- [Rein](https://presspool.ai/companies/reinsec-io): $25 million, Series A, announced October 8, 2026, led by Glilot Capital and Sienna Venture Capital.
- [Reco](https://presspool.ai/companies/reco-ai): $55 million, round type not disclosed, announced September 29, 2026.
- [Kontext](https://presspool.ai/companies/kontext-security): $4 million, round type not disclosed, announced September 24, 2026, led by 42CAP.
- [Palma.ai](https://presspool.ai/companies/palma-ai): $1.8 million, Pre-seed, announced September 23, 2026, led by D11Z.
- [Outerlimit](https://presspool.ai/companies/outerlimit-com): $16 million, Pre-seed, announced September 22, 2026.

## Sources for each company

- Reco: [own site](https://www.reco.ai/), [independent source](https://techcrunch.com/2026/09/29/reco-raises-55m-as-ai-agent-security-startups-crowd-the-market/), [Reco](https://www.reco.ai/blog/reco-raises-55-million-in-additional-funding-with-participation-from-at-t-ventures), [TechCrunch](https://techcrunch.com/2026/09/29/reco-raises-55m-as-ai-agent-security-startups-crowd-the-market/)
- Harmonic Security: [own site](https://www.harmonic.security/), [independent source](https://siliconangle.com/2026/10/14/harmonic-security-raises-50m-to-govern-how-employees-use-ai-tools/), [SiliconANGLE](https://siliconangle.com/2026/10/14/harmonic-security-raises-50m-to-govern-how-employees-use-ai-tools/), [BankInfoSecurity](https://www.bankinfosecurity.com/harmonic-security-raises-50m-to-track-ai-agent-activity-a-33110)
- Rein: [own site](https://reinsec.io/), [independent source](https://www.finsmes.com/2026/10/rein-security-raises-25m-in-series-a-funding.html), [Rein Security blog](https://reinsec.io/blog/series-a/), [FinSMEs](https://www.finsmes.com/2026/10/rein-security-raises-25m-in-series-a-funding.html)
- Opsin: [own site](https://www.opsinsecurity.com/), [independent source](https://www.accessnewswire.com/newsroom/en/computers-technology-and-internet/opsin-raises-21m-to-keep-ai-agents-on-task-and-out-of-trouble-1236364), [Opsin press release (ACCESS Newswire)](https://www.accessnewswire.com/newsroom/en/computers-technology-and-internet/opsin-raises-21m-to-keep-ai-agents-on-task-and-out-of-trouble-1236364), [FinSMEs](https://www.finsmes.com/2026/10/opsin-raises-21m-in-funding.html)
- Outerlimit: [own site](https://www.outerlimit.com/), [independent source](https://fintech.global/2026/09/24/outerlimit-raises-16m-as-agentic-ai-outpaces-security), [Outerlimit (GlobeNewswire)](https://www.globenewswire.com/news-release/2026/09/22/3366244/0/en/outerlimit-emerges-from-stealth-to-extend-zero-trust-to-the-agent-action-layer-by-creating-a-new-paradigm-to-secure-agentic-ai.html), [FinTech Global](https://fintech.global/2026/09/24/outerlimit-raises-16m-as-agentic-ai-outpaces-security)
- Kontext: [own site](https://kontext.security/), [independent source](https://tech.eu/2026/09/24/kontext-raises-4m-for-runtime-security-platform-for-ai-agents/), [Kontext](https://kontext.security/blog/kontext-raises-4m-funding), [Tech.eu](https://tech.eu/2026/09/24/kontext-raises-4m-for-runtime-security-platform-for-ai-agents/)
- Palma.ai: [own site](https://palma.ai/), [independent source](https://tech.eu/2026/09/23/palmaai-raises-18m-to-bring-governed-ai-agents-to-more-enterprises), [Tech.eu](https://tech.eu/2026/09/23/palmaai-raises-18m-to-bring-governed-ai-agents-to-more-enterprises), [StartupRise](https://startuprise.co.uk/palma-ai-raises-1-8m-in-pre-seed-funding-led-by-d11z)
- Giskard: [own site](https://www.giskard.ai/), [independent source](https://www.lemagit.fr/actualites/366632298/Red-teaming-Giskard-se-dote-dagents-pour-tester-la-securite-des-agents-IA)
- HiddenLayer: [own site](https://www.hiddenlayer.com/), [independent source](https://techcrunch.com/2026/09/02/hiddenlayer-nabs-100m-as-enterprises-rush-to-secure-their-ai-deployments/)
- Lasso Security: [own site](https://www.lasso.security/), [independent source](https://siliconangle.com/2026/09/02/lasso-security-launches-cpu-only-ai-guardrail-raises-30m/)
- Mindgard: [own site](https://mindgard.ai/), [independent source](https://www.securityweek.com/mindgard-raises-30-million-to-protect-ai-systems/)
- Noma Security: [own site](https://noma.security/), [independent source](https://www.reuters.com/world/middle-east/israeli-cyber-startup-noma-security-raises-100-million-private-funding-round-2025-07-31/)
- Pillar Security: [own site](https://www.pillar.security/), [independent source](https://siliconangle.com/2025/04/16/pillar-security-raises-9m-address-growing-ai-specific-security-risks/)
- Straiker: [own site](https://www.straiker.ai/), [independent source](https://www.securityweek.com/straiker-raises-64-million-for-ai-security-platform/)
- WitnessAI: [own site](https://witness.ai/), [independent source](https://www.axios.com/2026/01/13/witnessai-funding-enterprise-ai)
- Zenity: [own site](https://zenity.io/), [independent source](https://www.ynetnews.com/business/article/syx00ge0bzg)

## Which of these companies AI names

On October 19, 2026, Presspool asked the 8 questions below on ChatGPT, Claude, Perplexity, Gemini, Copilot, Google AI Mode and Google AI Overviews and recorded 53 answers. Not sampled: 3 Google AI Overviews answers. A company counts when an answer names it or cites its website. Answers vary from run to run, so each count is a dated sample, not a verdict.

| Company | Named or cited in | ChatGPT | Claude | Perplexity | Gemini | Copilot | Google AI Mode | Google AI Overviews |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Reco | 5 of 53 answers | 1 of 8 | 0 of 8 | 3 of 8 | 1 of 8 | 0 of 8 | 0 of 8 | 0 of 5 |
| Harmonic Security | 2 of 53 answers | 0 of 8 | 0 of 8 | 1 of 8 | 1 of 8 | 0 of 8 | 0 of 8 | 0 of 5 |
| Rein | 4 of 53 answers | 1 of 8 | 0 of 8 | 1 of 8 | 0 of 8 | 0 of 8 | 1 of 8 | 1 of 5 |
| Opsin | 1 of 53 answers | 1 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 5 |
| Outerlimit | 0 of 53 answers | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 5 |
| Kontext | 0 of 53 answers | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 5 |
| Palma.ai | 0 of 53 answers | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 8 | 0 of 5 |
| Giskard | 10 of 53 answers | 1 of 8 | 1 of 8 | 1 of 8 | 2 of 8 | 2 of 8 | 2 of 8 | 1 of 5 |
| HiddenLayer | 27 of 53 answers | 3 of 8 | 2 of 8 | 5 of 8 | 6 of 8 | 5 of 8 | 3 of 8 | 3 of 5 |
| Lasso Security | 11 of 53 answers | 2 of 8 | 1 of 8 | 3 of 8 | 3 of 8 | 0 of 8 | 2 of 8 | 0 of 5 |
| Mindgard | 22 of 53 answers | 4 of 8 | 2 of 8 | 2 of 8 | 5 of 8 | 3 of 8 | 3 of 8 | 3 of 5 |
| Noma Security | 13 of 53 answers | 2 of 8 | 2 of 8 | 4 of 8 | 1 of 8 | 0 of 8 | 2 of 8 | 2 of 5 |
| Pillar Security | 8 of 53 answers | 2 of 8 | 2 of 8 | 1 of 8 | 2 of 8 | 1 of 8 | 0 of 8 | 0 of 5 |
| Straiker | 10 of 53 answers | 2 of 8 | 2 of 8 | 2 of 8 | 1 of 8 | 0 of 8 | 1 of 8 | 2 of 5 |
| WitnessAI | 8 of 53 answers | 2 of 8 | 1 of 8 | 2 of 8 | 1 of 8 | 0 of 8 | 0 of 8 | 2 of 5 |
| Zenity | 15 of 53 answers | 2 of 8 | 3 of 8 | 4 of 8 | 3 of 8 | 2 of 8 | 1 of 8 | 0 of 5 |

## Sources the AI apps cited most for these questions

1. mindgard.ai: 10 of 53 answers
2. microsoft.com: 8 of 53 answers
3. openai.com: 8 of 53 answers
4. paloaltonetworks.com: 8 of 53 answers
5. linx.security: 7 of 53 answers
6. straiker.ai: 7 of 53 answers
7. checkpoint.com: 6 of 53 answers
8. gartner.com: 6 of 53 answers
9. respan.ai: 6 of 53 answers
10. techcrunch.com: 6 of 53 answers
11. tigera.io: 6 of 53 answers
12. dealroom.co: 5 of 53 answers
13. superblocks.com: 5 of 53 answers
14. cbinsights.com: 4 of 53 answers
15. crn.com: 4 of 53 answers

## What counts as AI security

A company joins this map when its own site describes AI security as its main product and an independent source confirms it. Out of scope: broad security platforms where AI security is one feature, AI security units inside large security companies (including acquired startups), and companies whose AI defends other systems rather than securing AI itself. Definitions are versioned; this is version 1. Corrections need a public source: see [Contact](https://presspool.ai/contact).

## Questions this map tracks

- Which companies secure AI agents?
- What are the leading AI security startups?
- What is AI agent security and who provides it?
- Which AI security startups have raised funding recently?
- What is the best platform to secure AI agents in the enterprise?
- Which tools protect AI applications against prompt injection?
- What are the alternatives to HiddenLayer?
- Best AI red teaming tools

## Changes

- October 19, 2026: Added WitnessAI and Giskard, named in AI answers and verified from each company's own site and an independent source. Promptfoo is left off: OpenAI acquired it on 2026-03-09.
- October 19, 2026: Map started with 14 verified companies, seven of them from the Press Pool funding roster.

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