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Top Cybersecurity Companies in the USA

16 of 109 cybersecurity companies ranked on evidence in the Q4 2026 edition.

Between them, the 109 cybersecurity companies on this page cover IT services (78), web development (67), web design (49) and cybersecurity (49). They also list work in United Kingdom, Canada and Ireland. 109 of them have written a profile you can read before you get in touch.

TrustList ranking

Q4 2026 edition

16 of 109 cybersecurity companies ranked on evidence held on 6 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.

Positions are fixed for the quarter; the next edition is due in January 2027.

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  1. Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
  2. UnderDefense Cyber Security logo

    IT Services · E-Commerce Development · IT Security

    UnderDefense Cyber Security is a cybersecurity firm that combines people and tooling to help companies detect and respond to attacks.

  3. Unknowns Lab logo

    Mobile App Development · Web Development · iOS App

    We have extended our services and protected companies ranging from entrepreneurs to Fortune 500 from unidentified cyber threats and delivered them a complete security solution.

  4. VASCO Data Security logo

    IT Services · Web Development · Web Design

    OneSpan enables financial institutions and other organizations to succeed by making bold advances in their digital transformation.

  5. VA

    Artificial Intelligence - AI · IT Services · E-Commerce Development · Also in Canada

    Vectra AI sells security software that uses artificial intelligence to spot and respond to cyberattacks.

    On record: Address in United States of America

  6. Veracode logo

    Mobile App Development · IT Services · Web Development

    Application security platform that finds, prioritises and helps fix software flaws for enterprise security and development teams

  7. V

    IT Services · E-Commerce Development · Network Security

    VMRay is a security company with a single focus: protecting enterprises from malware.

  8. Webroot logo

    IT Services · Web Development · Web Design

    Webroot is a cybersecurity company that uses cloud technology and machine learning to detect threats as they happen. It became part of Carbonite in 2019.

  9. WI

    IT Services · Web Development · Web Design

    Webroot is a cybersecurity company that uses cloud technology and machine learning to detect and block attacks.

  10. WS

    IT Services · Web Development · Web Design

    WhiteHat Security spent nearly two decades on application security.

    On record: Based in San Jose, California

  11. W

    IT Services · E-Commerce Development · Network Security

    WinMagic develops data encryption and authentication software. Its work centres on protecting data at rest, with full disk and file encryption managed from a single console.

  12. Zingbox Inc. logo

    Mobile App Development · Web Development · iOS App

    Zingbox Inc. makes IoT security software that protects organisations from cyber and insider threats.

  13. Zscaler logo

    Mobile App Development · IT Services · iOS App

    Zscaler is a cloud security company whose platform, the Zero Trust Exchange, sits on each connection and links users, devices and applications only to what they are allowed to…

    On record: Address in United States of America

  14. Zscaler logo

    IT Services · Web Development · Web Design

    Zscaler is a cloud security company built around zero trust. Its platform sits on every connection and links each user, device or workload only to the applications it is authorised…

    On record: Address in United States of America

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