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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.

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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
    • 28.5k employees
    • Founded 2023
  2. 2
    Railway· San Francisco, California, United States
    • Series B
    • 11k employees
    • Founded 2020
  3. 3
    Chief· New York, New York, United States
    • Series B
    • 7.8k employees
    • Founded 2019
  4. 4
    Datavant· New York, New York, United States
    • Series B
    • 7.1k employees
    • Founded 2014
  5. 5
    Shipt· Birmingham, Alabama, United States
    • Series B
    • 6.5k employees
    • Founded 2014
Reveal 3,719 more·100 free credits, no card

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 3,724 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: Sun, 21 Jun 2026 10:38:44 GMT

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