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Every cybersecurity vendor and service firm on the list. Tick the filters to build a shortlist, then open a profile to see who owns the company and what it does. You can also browse by category or country, or see recent deals.
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See also Cybersecurity consulting firms and companies based in the United States.
| Company | Category | Based in | Founded | Ownership |
|---|---|---|---|---|
 Trail of Bits Elite security research firm specializing in source code review, blockchain auditing, and building industry-standard open-source security tools. | Penetration testing | New York, United States | 2012 | Private |
 TrustedSec Offensive security firm founded by former NSA operator David Kennedy, delivering CREST-accredited penetration testing, red teaming, and adversary simulation to Fortune 500 and government clients. | Penetration testing | Fairlawn, United States | 2012 | Private |
T | Security consulting and vCISO | Chicago, United States | 1995 | Part of LevelBlue (formerly Trustwave) |
 UL Solutions Global testing and certification firm, recognised by the PCI SSC for PTS POI and HSM evaluation, with labs in the UK and China. | Compliance audits (SOC 2, ISO 27001) | Northbrook, United States | Public, ULS | |
 vCISO Lite vCISO Lite sells a subscription platform that helps growing companies handle security compliance and risk. | Security consulting and vCISO | Atlanta, United States | 2026 | Private |
V Vultara Web-based software that automates vehicle threat analysis and risk assessment, plus vulnerability tracking and consulting. | Automotive cybersecurity | Troy, Michigan, United States | Private | |
 XTIUM Provides managed IT services including security, cloud desktops, networks and AI deployment support. | Managed security services | Oldsmar, United States | Private | |
 YSecurity YSecurity provides an on-demand cybersecurity team for startups, handling compliance and security reviews. | Compliance audits (SOC 2, ISO 27001) | United States | Private | |
 Z-JAK Technologies Z-JAK Technologies is a Louisville-based provider of managed IT and cybersecurity services for small and midsize businesses, typically with 5 to 150 employees. | Managed security services | Louisville, United States | 2020 | Private |