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Top Cybersecurity companies

Companies defending or attacking software, networks, and cloud infrastructure.

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Ranked by current headcount across the largest Cybersecurity companies. Refreshed daily.

  1. 1
    Palo Alto Networks· Santa Clara, California, United States
    • Series C
    • 22.5k employees
    • Founded 2005
  2. 2
    Fortinet· Sunnyvale, California, United States
    • Series unknown
    • 16.3k employees
    • Founded 2000
  3. 3
    CrowdStrike· Remote, Oregon, United States
    • Post-IPO equity
    • 11.5k employees
    • Founded 2011
  4. 4
    NETWORK-SECURITY-SOLUTIONS· Poznan, Wielkopolskie, Poland
    • 10.4k employees
    • Founded 2010
  5. 5
    Zscaler· San Jose, California, United States
    • Post-IPO debt
    • 8.9k employees
    • Founded 2008
Reveal 4,028 more·100 free credits, no card

Find engineers and designers at top Cybersecurity companies

The Cybersecurity industry runs on the people who build it. The list above ranks the largest Cybersecurity companies by current headcount, drawn from public LinkedIn and Crunchbase records. Across the 4,033 Cybersecuritycompanies in our index, you’ll find software engineers, ML researchers, designers, founders, and recruiters worth talking to - whether you’re hiring, investing, or doing market research.

Each company on the list is a hub of talent. The biggest Cybersecurity companies tend to attract specialised engineers, while younger ones run on small founding teams and hire generalists. Looking at headcount, last funding round, and HQ location side by side gives you a quick read on where the talent density is highest.

Refolk turns this list into a search. Ask for “Cybersecurityengineers in San Francisco hiring senior ML” or “designers at Cybersecuritycompanies who shipped a product in 2025” and Refolk returns a fresh ranked shortlist with the sources that earned each person a spot.

How this list is built

Refolk pulled the largest companies in Cybersecurity from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 09:12:56 GMT

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