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Top Series B companies in the United States

Companies that have closed a Series B — proven scaling motion, hiring aggressively. Filtered to companies headquartered in the United States.

Built from a search like: Top Series B companies in the United States

Ranked by current headcount across Series B companies headquartered in the United States. Refreshed daily.

  1. 1
    Outlier· San Francisco, California, United States
    • Series B
    • 27.7k employees
    • Founded 2023
  2. 2
    Fortinet· Sunnyvale, California, United States
    • Series B
    • 16k employees
    • Founded 2014
  3. 3
    Railway· San Francisco, California, United States
    • Series B
    • 10.7k employees
    • Founded 2020
  4. 4
    Cloud Software Group· Fort Lauderdale, Florida, United States
    • Series B
    • 9.5k employees
    • Founded 2008
  5. 5
    Chief· New York, New York, United States
    • Series B
    • 8k employees
    • Founded 2019
  6. 6
    Datavant· Phoenix, Arizona, United States
    • Series B
    • 7.1k employees
    • Founded 2017
  7. 7
    Shipt· Birmingham, Alabama, United States
    • Series B
    • 6.5k employees
    • Founded 2014
  8. 8
    Driver· San Francisco, California, United States
    • Series B
    • 6.2k employees
    • Founded 2015
  9. 9
    GitHub· San Francisco, California, United States
    • Series B
    • 6k employees
    • Founded 2008
  10. 10
    Sama· San Francisco, California, United States
    • Series B
    • 4.3k employees
    • Founded 2008
  11. 11
    Extreme Networks· Morrisville, North Carolina, United States
    • Series B
    • 4k employees
    • Founded 1996
  12. 12
    Tredence Inc.· San Jose, California, United States
    • Series B
    • 4k employees
    • Founded 2013
  13. 13
    Nourish· New York City Metropolitan Area
    • Series B
    • 3k employees
    • Founded 2021
  14. 14
    SchooLinks· Austin, Texas, United States
    • Series B
    • 2.9k employees
    • Founded 2014
  15. 15
    Numerator· Chicago, Illinois, United States
    • Series B
    • 2.7k employees
    • Founded 1990
  16. 16
    Home Chef· Chicago, Illinois, United States
    • Series B
    • 2.7k employees
    • Founded 2013
  17. 17
    NETSCOUT· Westford, Massachusetts, United States
    • Series B
    • 2.7k employees
    • Founded 1984
  18. 18
    Tutor.com· New York, New York, United States
    • Series B
    • 2.6k employees
    • Founded 2000
  19. 19
    Login· Tucson, Arizona, United States
    • Series B
    • 2.6k employees
    • Founded 2001
  20. 20
    Proprio· Seattle, Washington, United States
    • Series B
    • 2.6k employees
    • Founded 2016
  21. 21
    Atlas HXM· Chicago, Illinois, United States
    • Series B
    • 2.2k employees
    • Founded 2015
  22. 22
    Logoworks· New Bern, North Carolina, United States
    • Series B
    • 2.1k employees
    • Founded 2001
  23. 23
    Shiftsmart· New York, New York, United States
    • Series B
    • 1.9k employees
    • Founded 2015
  24. 24
    Priceline· Norwalk, Connecticut, United States
    • Series B
    • 1.8k employees
    • Founded 1998
  25. 25
    DataCamp· New York, New York, United States
    • Series B
    • 1.8k employees
    • Founded 2014

Find engineers at Series B companies in the United States

Series B companies in the United States are some of the fastest-moving employers in the market. The list above ranks the largest Series B-stage companies headquartered in the United States by current headcount, drawn from public LinkedIn and Crunchbase records. With 3,619 matching companies in our index, the density of senior engineers, designers, and founders is unusually high.

At Series B, teams tend to be small, ambitious, and on the hunt for senior talent. The companies on this list are good signals for where the the United Statestalent market is heating up — and for which engineers and founders are about to become tomorrow’s operators.

Refolk converts this list into a live search. Ask for “founders of Series B companies in the United States” or “senior engineers at Series B companies in the United States hiring” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled Series B companies headquartered in the United States 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 07:57:29 GMT

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