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Top Series A Biotech companies

Companies applying biology, chemistry, and computation to therapeutics and tooling. Filtered to companies whose latest disclosed round is Series A.

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

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

  1. 1
    Genentech· South San Francisco, California, United States
    • Series A
    • 18.2k employees
    • Founded 1976
  2. 2
    Esco· Singapore, Singapore
    • Series A
    • 1.3k employees
    • Founded 1978
  3. 3
    Rentschler Biopharma· Laupheim, Baden-Württemberg, Germany
    • Series A
    • 901 employees
    • Founded 1927
  4. 4
    Altos Labs
    • Series A
    • 559 employees
    • Founded 2021
  5. 5
    BlueRock Therapeutics· Cambridge, Massachusetts, United States
    • Series A
    • 473 employees
    • Founded 2016
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Find engineers and founders at Series A Biotech companies

Series A Biotech companies are some of the most active hirers in the market. The list above ranks the largest Biotech companies whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. Across 902matching companies, you’ll find senior engineers, founding designers, and operators worth tracking.

Companies at this stage in Biotech share a profile: a working product, fresh capital, and a hiring plan that wants senior people yesterday. Looking at headcount, last round, and HQ side by side gives you a quick read on where Biotech talent is concentrating right now.

Refolk converts this list into a search. Ask for “Series A Biotech founders hiring senior engineers” or “design leads at Series A Biotech companies” and Refolk returns a fresh ranked shortlist with the sources behind each match.

How this list is built

Refolk pulled Biotech companies 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 5 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 11:23:44 GMT

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