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.
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.
- 1Genentech· South San Francisco, California, United States
- Series A
- 18.1k employees
- Founded 1976
- 2Xaira Therapeutics· South San Francisco, California, United States
- Series A
- 192 employees
- Founded 2023
- 3iZumi· South San Francisco, California, United States
- Series A
- 92 employees
- Founded 2007
- 4BIOMAKERS· San Francisco, California, United States
- Series A
- 77 employees
- Founded 2014
- 5Addition Therapeutics· South San Francisco, California, United States
- Series A
- 64 employees
- 6OneSkin· San Francisco, California, United States
- Series A
- 57 employees
- Founded 2016
- 7TRexBio· South San Francisco, California, United States
- Series A
- 56 employees
- Founded 2018
- 8SonoThera· South San Francisco, California, United States
- Series A
- 49 employees
- Founded 2021
- 9Until· San Francisco, California, United States
- Series A
- 46 employees
- Founded 2024
- 10Vilya· South San Francisco, California, United States
- Series A
- 45 employees
- Founded 2022
- 11Tenvie Therapeutics· South San Francisco, California, United States
- Series A
- 43 employees
- Founded 2025
- 12Shinobi Therapeutics· South San Francisco, California, United States
- Series A
- 41 employees
- Founded 2023
- 13Rezo Therapeutics· San Francisco, California, United States
- Series A
- 40 employees
- Founded 2021
- 14Gordian Biotechnology· South San Francisco, California, United States
- Series A
- 39 employees
- Founded 2018
- 15SyntheX· San Francisco, California, United States
- Series A
- 34 employees
- Founded 2016
- 16Nudge· San Francisco, California, United States
- Series A
- 33 employees
- Founded 2024
- 17Mission Barns· San Francisco, California, United States
- Series A
- 32 employees
- Founded 2018
- 18Nura Bio· South San Francisco, California, United States
- Series A
- 31 employees
- Founded 2018
- 19Switch Therapeutics· San Francisco, California, United States
- Series A
- 30 employees
- Founded 2020
- 20Atomic AI· South San Francisco, California, United States
- Series A
- 30 employees
- Founded 2021
- 21Prolynx· San Francisco, California, United States
- Series A
- 30 employees
- Founded 2009
- 223T Biosciences· South San Francisco, California, United States
- Series A
- 29 employees
- Founded 2017
- 23CIONIC· San Francisco, California, United States
- Series A
- 29 employees
- Founded 2018
- 24Deep Apple Therapeutics· San Francisco Bay Area
- Series A
- 29 employees
- Founded 2022
- 25Faeth Therapeutics· San Francisco, California, United States
- Series A
- 28 employees
- Founded 2019
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 57 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
Last refreshed: Thu, 07 May 2026 08:09:49 GMT
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