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Series A Biotech companies in San Francisco

Companies applying biology, chemistry, and computation to therapeutics and tooling. Filtered to Series A-stage companies headquartered in San Francisco.

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

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

  1. 1
    Genentech· South San Francisco, California, United States
    • Series A
    • 18.2k employees
    • Founded 1976
  2. 2
    Xaira Therapeutics· South San Francisco, California, United States
    • Series A
    • 202 employees
    • Founded 2023
  3. 3
    iZumi· South San Francisco, California, United States
    • Series A
    • 93 employees
    • Founded 2007
  4. 4
    BIOMAKERS· San Francisco, California, United States
    • Series A
    • 77 employees
    • Founded 2014
  5. 5
    Addition Therapeutics· South San Francisco, California, United States
    • Series A
    • 65 employees
Reveal 47 more·100 free credits, no card

Find engineers at Series A Biotech companies in San Francisco

Searching for “engineers at top Series A Biotech companies in San Francisco” surfaces this slice of the market. The list above ranks Biotech companies headquartered in San Francisco whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. With 52 matching companies in our index, this is a tight read on where the Biotech talent in San Francisco is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series A, Biotech, in San Francisco - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Biotech’s next operators and angel investors.

Refolk converts this list into a live search. Ask for “senior engineers at Series A Biotech companies in San Francisco hiring” or “founders of Series A Biotech companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled Biotech companies headquartered in San Francisco whose latest disclosed funding round is Series A from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 12:47:36 GMT

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