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Top Series A companies in San Francisco

Companies that have closed a Series A - product-market fit confirmed and scaling. Filtered to companies headquartered in San Francisco.

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Built from a search like: “Top Series A companies in San Francisco”

Ranked by current headcount across Series A companies headquartered in San Francisco. Refreshed daily.

  1. 1
    Genentech· South San Francisco, California, United States
    • Series A
    • 18.2k employees
    • Founded 1976
  2. 2
    micro1· San Francisco Bay Area
    • Series A
    • 7k employees
    • Founded 2022
  3. 3
    Gusto· San Francisco, California, United States
    • Series A
    • 4.4k employees
    • Founded 2011
  4. 4
    Orrick, Herrington & Sutcliffe LLP· San Francisco, California, United States
    • Series A
    • 3.2k employees
  5. 5
    Cambly Inc.· San Francisco, California, United States
    • Series A
    • 3k employees
    • Founded 2012
Reveal 932 more·100 free credits, no card

Find engineers at Series A companies in San Francisco

Series A companies in San Francisco are some of the fastest-moving employers in the market. The list above ranks the largest Series A-stage companies headquartered in San Francisco by current headcount, drawn from public LinkedIn and Crunchbase records. With 937 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 San Franciscotalent 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 San Francisco” or “senior engineers at Series A companies in San Francisco hiring” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled Series A companies headquartered in San Francisco 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 09:38:56 GMT

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