MentionFox lists 172 Cybersecurity companies. Of them, 143 are Y Combinator companies (the newest batch here is Fall 2026, with 3); 17 filed a Form D notice with the SEC; 12 won an SBIR or STTR award.
Companies172
Y Combinator143
Form D filers17
SBIR/STTR winners12
By year
- 2026: 42 companies (22 Y Combinator, 17 Form D filers, 3 SBIR/STTR winners); median amount sold $6M across 17 Form D notices
- 2025: 27 companies (19 Y Combinator, 8 SBIR/STTR winners)
- 2022: 19 companies (19 Y Combinator)
Cybersecurity startups from other years
Companies from before 2020, or from a year with fewer than 15 of them. Every other year has its own full list, linked above.
| Company | What it does | Date | Amount | Round / stage | Record |
|---|---|---|---|---|---|
| Owl Cyber Defense Solutions LLC | To purchase a cross domain full motion video (cdfmv) system alexsys 13019 | Award starts Dec 9, 2024 | $623,250 | SBIR Phase III | Federal award record |
| Gecko Security | The AI Security Engineer to Find and Fix Vulnerabilities | Fall 2024 | Y Combinator batch | Y Combinator listing | |
| Clearly AI | Automate security and privacy reviews | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| Unbound | Use AI tools without fear of data leakage | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| winfunc | ai-native security engineering for mission critical codebases | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| ZeroPath | Automatically find and fix your software vulnerabilities | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| CodeAnt AI | Autonomous offensive and defensive cybersecurity platform | Winter 2024 | Y Combinator batch | Y Combinator listing | |
| Indemni | Cargo Theft and Fraud Prevention Platform | Winter 2024 | Y Combinator batch | Y Combinator listing | |
| PromptArmor | LLM Security and Compliance | Winter 2024 | Y Combinator batch | Y Combinator listing | |
| Risotto | Risotto auto-solves IT support requests using AI | Winter 2024 | Y Combinator batch | Y Combinator listing | |
| Tracecat | Open-source agentic security automation platform | Winter 2024 | Y Combinator batch | Y Combinator listing | |
| Corgea | Corgea finds, and fixes insecure code and packages autonomously | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Metalware | Firmware cybersecurity | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Proof of Human | continuous human verification without CAPTCHAs or user friction | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Xeol | Close your outdated dependency attack vector | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Clearspace | Less screen time, more life. | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| EdgeBit | Autofix your software dependencies | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Infisical | Unified platform for secrets, certs, and privileged access management | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Matano | Cloud Native SIEM (alternative to Splunk/Elastic) | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Variance | AI Agents for Fraud Review and Investigations | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Cloudanix | Cloud and Container Security Platform | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| ContraForce | Security Delivery Platform to orchestrate AI agents for Service… | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| idemeum | AI-powered Application Control | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Keyri | Secure fraud prevention and authentication platform for developers | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Malloc Inc | AI-driven mobile cybersecurity | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Tarsal | Data pipeline for your security data lake. | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Telivy | Automate your cyber security risk assessments | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| authzed | Winter 2021 | Y Combinator batch | Y Combinator listing | ||
| Cyble | Cyble - World’s First Intelligence-Driven, AI-Native Security… | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Feroot Security | AI-powered Compliance Platform for PCI 4, CCPA, HIPAA, CIPA, 50+ laws | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| hoop.dev | Code review for DevOps tasks | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Reclaim Protocol | Education, Employment, Loyalty verification | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| SpruceID | SpruceID lets users control their data across the web. | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Stacksi | Automated Answers to Security Questionnaires | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Fig | Fig adds visual apps, shortcuts, and autocomplete to your terminal. | Summer 2020 | Y Combinator batch | Y Combinator listing | |
| Formal | Take control of your data in real-time. | Summer 2020 | Y Combinator batch | Y Combinator listing | |
| Nestybox | Enables Linux containers to act as super fast & efficient VMs | Summer 2020 | Y Combinator batch | Y Combinator listing | |
| SafeBase | Trust Center platform that scales customer security reviews | Summer 2020 | Y Combinator batch | Y Combinator listing | |
| Swif.ai | Manage every device | Summer 2020 | Y Combinator batch | Y Combinator listing | |
| Vectrix | Scan your SaaS apps and instantly identify security issues | Summer 2020 | Y Combinator batch | Y Combinator listing | |
| Infield | Safer, faster dependency upgrades | Winter 2020 | Y Combinator batch | Y Combinator listing | |
| Riot | Cybersecurity awareness for fast growing companies | Winter 2020 | Y Combinator batch | Y Combinator listing | |
| Bouncer | SDK for scanning and verifying credit cards and photo IDs in mobile… | Summer 2019 | Y Combinator batch | Y Combinator listing | |
| Trm Labs | TRM is building a safer world for billions of people. | Summer 2019 | Y Combinator batch | Y Combinator listing | |
| Dagger | Develop your CI/CD pipelines as code and run them anywhere | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Doppler | Secure secrets | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Dyneti Technologies | Reduce payment fraud | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Fuzzbuzz | Fuzzing as a Service | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Termius | Termius is an SSH client with team collaboration features | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Truora | Reliable background checks & fraud prevention tools for Latin America. | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Berbix | Convert more verified users | Summer 2018 | Y Combinator batch | Y Combinator listing | |
| Tall Poppy | Protecting your employees against online harassment | Summer 2018 | Y Combinator batch | Y Combinator listing | |
| Anjuna | Anjuna enabled organizations to trust any infrastructure | Winter 2018 | Y Combinator batch | Y Combinator listing | |
| Sqreen | Sqreen is the application security platform for the modern enterprise | Winter 2018 | Y Combinator batch | Y Combinator listing | |
| Vanta | Vanta—the proven leader in automated compliance helping startups… | Winter 2018 | Y Combinator batch | Y Combinator listing | |
| Templarbit | Protecting applications from malicious activity | Summer 2017 | Y Combinator batch | Y Combinator listing | |
| Upfort | Turnkey security & hassle-free cyber insurance from leading insurers | Summer 2017 | Y Combinator batch | Y Combinator listing | |
| Ambient.ai | AI company transforming enterprise physical security to prevent… | Winter 2017 | Y Combinator batch | Y Combinator listing | |
| Apozy | Apozy makes every website safe to browse | Winter 2017 | Y Combinator batch | Y Combinator listing | |
| Armory | Continuous Deployment at any scale, for all developers. | Winter 2017 | Y Combinator batch | Y Combinator listing | |
| Bitrise | Hosted Continuous Integration and Delivery for mobile apps | Winter 2017 | Y Combinator batch | Y Combinator listing | |
| Fabric | Fabric is a personal location-based journal that catalogs experiences… | Summer 2016 | Y Combinator batch | Y Combinator listing | |
| Proxy | Smart ring digital wallet | Summer 2016 | Y Combinator batch | Y Combinator listing | |
| AmberBox Gunshot Detection | Detect Gunshots | Inform Law Enforcement | Empower First Responders | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| Castle | Block bots & bad behavior | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| NetBeez | Network monitoring from the end-user perspective | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| Salt Security | Protects organizations from getting breached through their APIs. | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| Stealth Worker | Information Security (Cyber Security), Compliance and Privacy (GDPR &… | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| Appcanary | Appcanary tracks the dependencies you use in your apps and servers… | Summer 2015 | Y Combinator batch | Y Combinator listing | |
| Cymmetria | Shifting the asymmetry of cyber security. | Summer 2015 | Y Combinator batch | Y Combinator listing | |
| Foxpass | Making enterprise security practices available for all companies. | Summer 2015 | Y Combinator batch | Y Combinator listing | |
| Teleport | The Infrastructure Identity Company | Summer 2015 | Y Combinator batch | Y Combinator listing | |
| CyberFend | Cyberfend delivers robust, real-time web and mobile security by… | Winter 2015 | Y Combinator batch | Y Combinator listing | |
| Aptible | The No Infrastructure Platform as a Service | Summer 2014 | Y Combinator batch | Y Combinator listing | |
| Cognito | Frictionless, modern identity verification that starts with just a… | Summer 2014 | Y Combinator batch | Y Combinator listing | |
| Permutive | Rebuilding data in advertising to protect privacy | Summer 2014 | Y Combinator batch | Y Combinator listing | |
| Kuna Systems | We're making a smart, front door camera with intercom that lets you… | Winter 2014 | Y Combinator batch | Y Combinator listing | |
| TrueVault | We make Privacy Software for SMBs. | Winter 2014 | Y Combinator batch | Y Combinator listing | |
| Meldium | Simple password & identity management for teams | Winter 2013 | Y Combinator batch | Y Combinator listing | |
| Mattermost | Secure Collaboration for Technical Teams | Summer 2012 | Y Combinator batch | Y Combinator listing | |
| Mth Sense | We're a mobile on-device profiling and ad-serving platform initially… | Summer 2012 | Y Combinator batch | Y Combinator listing | |
| Authy | Authy is a Two-Factor Authentication platform for developers | Winter 2012 | Y Combinator batch | Y Combinator listing | |
| Cryptoseal | Server key management, VPN as a Service, Privacy VPN | Summer 2011 | Y Combinator batch | Y Combinator listing | |
| AeroFS | Secure Enterprise Collaboration. | Summer 2010 | Y Combinator batch | Y Combinator listing |
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Figures come only from the record linked in each row; a blank means the record gives none. How these lists are built.