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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.

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
    • 21.4k employees
    • Founded 2005
  2. 2
    Qualys· San Mateo, California, United States
    • Series C
    • 3.6k employees
    • Founded 1999
  3. 3
    Safe Security· Palo Alto, California, United States
    • Series C
    • 1.2k employees
    • Founded 2012
  4. 4
    Checkmarx· Paramus, New Jersey, United States
    • Series C
    • 998 employees
    • Founded 2006
  5. 5
    YesWeHack· Paris, Île-de-France, France
    • Series C
    • 620 employees
    • Founded 2015
  6. 6
    Orca Security· Portland, Oregon, United States
    • Series C
    • 504 employees
    • Founded 2019
  7. 7
    Halcyon· San Diego, California, United States
    • Series C
    • 503 employees
    • Founded 2021
  8. 8
    Stormshield· Issy-les-Moulineaux, Île-de-France, France
    • Series C
    • 417 employees
    • Founded 2014
  9. 9
    Red Canary, a Zscaler company· Denver, Colorado, United States
    • Series C
    • 396 employees
    • Founded 2013
  10. 10
    Noname Security· San Jose, California, United States
    • Series C
    • 378 employees
    • Founded 2020
  11. 11
    Immersive· Bristol, England, United Kingdom
    • Series C
    • 343 employees
    • Founded 2017
  12. 12
    Cynet Security· Boston, Massachusetts, United States
    • Series C
    • 331 employees
    • Founded 2014
  13. 13
    Picus Security· San Francisco, California, United States
    • Series C
    • 313 employees
    • Founded 2013
  14. 14
    Array Networks· Milpitas, California, United States
    • Series C
    • 263 employees
    • Founded 2000
  15. 15
    Obsidian Security· Newport Beach, California, United States
    • Series C
    • 256 employees
    • Founded 2017
  16. 16
    CHEQ· New York, New York, United States
    • Series C
    • 254 employees
    • Founded 2016
  17. 17
    Arkose Labs· San Mateo, California, United States
    • Series C
    • 251 employees
    • Founded 2016
  18. 18
    Deepwatch· Palo Alto, California, United States
    • Series C
    • 234 employees
    • Founded 2019
  19. 19
    Cyware· Jersey City, New Jersey, United States
    • Series C
    • 225 employees
    • Founded 2016
  20. 20
    Filigran· New York, New York, United States
    • Series C
    • 221 employees
    • Founded 2022
  21. 21
    Fortress Information Security· Orlando, Florida, United States
    • Series C
    • 217 employees
    • Founded 2015
  22. 22
    Fortanix· Santa Clara, California, United States
    • Series C
    • 212 employees
    • Founded 2016
  23. 23
    DataDome· New York, New York, United States
    • Series C
    • 209 employees
    • Founded 2015
  24. 24
    Wallarm: API Security Leader· San Francisco, California, United States
    • Series C
    • 193 employees
    • Founded 2016
  25. 25
    Blackpoint Cyber· Denver, Colorado, United States
    • Series C
    • 191 employees
    • Founded 2014

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 89matching 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: Thu, 07 May 2026 06:56:26 GMT

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