MentionFox lists 42 Cybersecurity companies for 2026. Of them, 22 are Y Combinator companies (the newest batch here is Fall 2026, with 3); 17 filed a Form D notice with the SEC; 3 won an SBIR or STTR award. Across the 17 Form D notices in the table that report an amount sold, the median is $6M; the largest is $189M, by ThreatLocker, Inc. (its Form D, filed Jul 30, 2026).
Other years
All years (172) 2025 (27) 2022 (19)
Cybersecurity startups in 2026
| Company | What it does | Date | Amount | Round / stage | Record |
|---|---|---|---|---|---|
| Yardstik, Inc. | Filed Sep 15, 2026 | $16.5M | SEC Form D | ||
| IDmission LLC | Filed Sep 9, 2026 | $1M | SEC Form D | ||
| Balance Theory Inc. (funding history) | Filed Sep 4, 2026 | $12M | SEC Form D | ||
| DeepMark | A live watermark inside AI voice that survives phone calls | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| GrayPass | Verify that the expected person is in control before key actions. | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| OpenHack | Always-on AI security engineer | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Seerist, Inc. | Filed Aug 17, 2026 | $924,903 | SEC Form D | ||
| EmulateAI, Inc. | Filed Aug 7, 2026 | $400,000 | SEC Form D | ||
| Empirical Security, Inc. (funding history) | Filed Aug 3, 2026 | $20.8M | SEC Form D | ||
| Zigguratum, Inc. | Ph ii, escape = enhancing security capabilities through and analytic platform ecosystems | Award starts Aug 1, 2026 | $3.5M | SBIR | Federal award record |
| ThreatLocker, Inc. (funding history) | Filed Jul 30, 2026 | $189M | SEC Form D | ||
| BlueFletch Corp. | Filed Jun 22, 2026 | $225,000 | SEC Form D | ||
| FutureState, Inc. (funding history) | Filed Jun 8, 2026 | $12,500 | SEC Form D | ||
| Caution | Hosting platform for software you don't want to have hacked | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Conifer | Least cost routing system to reduce 80%+ token spend | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Egoist Machines | Your personal context, securely portable across every AI app. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Fabraix | The world's frontier hacker for AI agents. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Nebula Security | Autonomous AI defense system for cyber attack | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| NebuSec | Autonomous AI defense system for cyber attack | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| OneCLI | The open source AI teammates for your company. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Palisade | AI that finds and fixes OS-level vulnerabilities across device fleets | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Rise Reforming | We turn waste gases into valuable supply-secure chemicals | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Traceforce | CrowdStrike for AI Agents | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Trident | Autonomous offensive security agents | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Verdict Machine | AI cybersecurity for financial institutions' digital assets | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Red Balloon Security, Inc | Small business technology transfer (sttr) phase ii topic a22b-t023, real time cybersecurity systems for safety critical military vehicle… | Award starts May 15, 2026 | $1.1M | STTR Phase II | Federal award record |
| Dak Dynamics LLC | Filed May 11, 2026 | $25,000 | SEC Form D | ||
| Phin Security, Inc. (funding history) | Filed Apr 21, 2026 | $6M | SEC Form D | ||
| Fendx Technologies Inc. (funding history) | Filed Apr 16, 2026 | $53,750 | SEC Form D | ||
| Fuceltech Inc | Direct to phase ii, topic number o254-d04, resilient domestic supply of vcsels for quantum devices addresses key supply chain… | Award starts Apr 6, 2026 | $2.1M | SBIR Phase II | Federal award record |
| Raspire | Autonomous Runtime Security | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Tolmo | Tolmo is the AI security platform that secures every layer of cloud… | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Cloaked, Inc. | Filed Mar 27, 2026 | $117M | SEC Form D | ||
| MetaCTF, Inc. | Filed Mar 27, 2026 | $1M | SEC Form D | ||
| ZeroPath Corp. | Filed Mar 23, 2026 | $7M | SEC Form D | ||
| Spektrum Labs, Inc. | Filed Feb 24, 2026 | $7.2M | SEC Form D | ||
| Darwinium Holdings, Inc. (funding history) | Filed Feb 20, 2026 | $7M | SEC Form D | ||
| Agentic Fabriq | The control plane for AI agents. | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Crosslayer Labs | Protect, monitor and defend your Internet presence | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Klaus AI | Fast and Safe OpenClaw on the cloud | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Parameter | Security builds trust | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Protent | Real time intelligence for law enforcement & security teams. | Winter 2026 | Y Combinator batch | Y Combinator listing |
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