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Top Series C Cybersecurity companies

Companies defending or attacking software, networks, and cloud infrastructure. Filtered to companies whose latest disclosed round is Series C.

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Built from a search like: “Top Series C Cybersecurity companies”

Ranked by current headcount across Series C Cybersecurity companies. Refreshed daily.

  1. 1
    Palo Alto Networks· Santa Clara, California, United States
    • Series C
    • 22.5k employees
    • Founded 2005
  2. 2
    Qualys· San Mateo, California, United States
    • Series C
    • 3.6k employees
    • Founded 1999
  3. 3
    Nile· San Jose, California, United States
    • Series C
    • 1.3k employees
    • Founded 2018
  4. 4
    Safe Security· Palo Alto, California, United States
    • Series C
    • 1.2k employees
    • Founded 2012
  5. 5
    Checkmarx· Paramus, New Jersey, United States
    • Series C
    • 1k employees
    • Founded 2006
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Find engineers and founders at Series C Cybersecurity companies

Series C Cybersecurity companies are some of the most active hirers in the market. The list above ranks the largest Cybersecurity companies whose latest disclosed round is Series C, by current headcount, drawn from public LinkedIn and Crunchbase records. Across 90matching companies, you’ll find senior engineers, founding designers, and operators worth tracking.

Companies at this stage in Cybersecurity share a profile: a working product, fresh capital, and a hiring plan that wants senior people yesterday. Looking at headcount, last round, and HQ side by side gives you a quick read on where Cybersecurity talent is concentrating right now.

Refolk converts this list into a search. Ask for “Series C Cybersecurity founders hiring senior engineers” or “design leads at Series C Cybersecurity companies” and Refolk returns a fresh ranked shortlist with the sources behind each match.

How this list is built

Refolk pulled Cybersecurity companies whose latest disclosed funding round is Series C from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 15:19:54 GMT

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