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Top Series A companies in the United States

Companies that have closed a Series A — product-market fit confirmed and scaling. Filtered to companies headquartered in the United States.

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

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

  1. 1
    Foundever· Miami, Florida, United States
    • Series A
    • 103.6k employees
    • Founded 2019
  2. 2
    Taco Bell· Irvine, California, United States
    • Series A
    • 84.9k employees
    • Founded 1962
  3. 3
    Stealth Startup· San Francisco, California, United States
    • Series A
    • 32.4k employees
    • Founded 2020
  4. 4
    HARMAN International· Stamford, Connecticut, United States
    • Series A
    • 28.8k employees
    • Founded 1980
  5. 5
    VXI Global Solutions· Los Angeles, California, United States
    • Series A
    • 22.2k employees
    • Founded 2015
  6. 6
    Indeed· Austin, Texas, United States
    • Series A
    • 19.5k employees
    • Founded 2004
  7. 7
    Genentech· South San Francisco, California, United States
    • Series A
    • 18.1k employees
    • Founded 1976
  8. 8
    Panda Restaurant Group· Rosemead, California, United States
    • Series A
    • 18.1k employees
    • Founded 1973
  9. 9
    Massage Envy· Scottsdale, Arizona, United States
    • Series A
    • 16.7k employees
    • Founded 2002
  10. 10
    UW Health· Madison, Wisconsin, United States
    • Series A
    • 10k employees
    • Founded 1918
  11. 11
    Sony Pictures Entertainment· Culver City, California, United States
    • Series A
    • 8.3k employees
    • Founded 1987
  12. 12
    Cook Medical· Bloomington, Indiana, United States
    • Series A
    • 8.1k employees
    • Founded 1963
  13. 13
    iSoftStone· Plano, Texas, United States
    • Series A
    • 7.3k employees
    • Founded 2005
  14. 14
    Isagenix· Gilbert, Arizona, United States
    • Series A
    • 7.2k employees
    • Founded 2002
  15. 15
    Temu· Boston, Massachusetts, United States
    • Series A
    • 6.3k employees
    • Founded 2022
  16. 16
    Starcom· Chicago, Illinois, United States
    • Series A
    • 5.7k employees
    • Founded 2020
  17. 17
    Horizon Blue Cross Blue Shield of New Jersey· Newark, New Jersey, United States
    • Series A
    • 5.2k employees
    • Founded 1932
  18. 18
    Gusto· San Francisco, California, United States
    • Series A
    • 4.4k employees
    • Founded 2011
  19. 19
    micro1· San Francisco Bay Area
    • Series A
    • 4.1k employees
    • Founded 2022
  20. 20
    Quantiphi· Marlborough, Massachusetts, United States
    • Series A
    • 4k employees
    • Founded 2013
  21. 21
    HealthPlanOne· Shelton, Connecticut, United States
    • Series A
    • 3.9k employees
    • Founded 2006
  22. 22
    SHOP.COM· Greensboro, North Carolina, United States
    • Series A
    • 3.7k employees
    • Founded 2004
  23. 23
    University of Massachusetts· Boston, Massachusetts, United States
    • Series A
    • 3.5k employees
    • Founded 2020
  24. 24
    Lightera· Norcross, Georgia, United States
    • Series A
    • 3.4k employees
    • Founded 2025
  25. 25
    Centific· Redmond, Washington, United States
    • Series A
    • 3.2k employees
    • Founded 2020

Find engineers at Series A companies in the United States

Series A companies in the United States are some of the fastest-moving employers in the market. The list above ranks the largest Series A-stage companies headquartered in the United States by current headcount, drawn from public LinkedIn and Crunchbase records. With 6,510 matching companies in our index, the density of senior engineers, designers, and founders is unusually high.

At Series A, 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 A companies in the United States” or “senior engineers at Series A 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 A 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 08:22:08 GMT

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