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.
- StageSeries A
- IndustryBiotech
- Matches889
Built from a search like: “Top Series A Biotech companies”
Ranked by current headcount across Series A Biotech companies. Refreshed daily.
- 1Genentech· South San Francisco, California, United States
- Series A
- 18.1k employees
- Founded 1976
- 2Esco· Singapore, Singapore
- Series A
- 1.3k employees
- Founded 1978
- 3MedImmune· Gaithersburg, Maryland, United States
- Series A
- 906 employees
- Founded 1987
- 4Rentschler Biopharma· Laupheim, Baden-Württemberg, Germany
- Series A
- 898 employees
- Founded 1927
- 5Altos Labs
- Series A
- 576 employees
- Founded 2021
- 6BlueRock Therapeutics· Cambridge, Massachusetts, United States
- Series A
- 463 employees
- Founded 2016
- 7Meihua Holdings Group Co., Ltd.· China
- Series A
- 441 employees
- Founded 2002
- 8Isomorphic Labs· London, England, United Kingdom
- Series A
- 348 employees
- Founded 2021
- 9GENEWIZ from Azenta Life Sciences· South Plainfield, New Jersey, United States
- Series A
- 307 employees
- Founded 2021
- 10Seed Health· Los Angeles, California, United States
- Series A
- 249 employees
- Founded 2016
- 11Watchmaker Genomics· Boulder, Colorado, United States
- Series A
- 236 employees
- Founded 2019
- 12Health in Code Group· Valencia, Valencian Community, Spain
- Series A
- 227 employees
- Founded 2001
- 13Vital Bio· Oakville, Ontario, Canada
- Series A
- 224 employees
- Founded 2019
- 14Andes· Alameda, California, United States
- Series A
- 219 employees
- Founded 2018
- 15Xaira Therapeutics· South San Francisco, California, United States
- Series A
- 192 employees
- Founded 2023
- 16Partner Therapeutics· Lexington, Massachusetts, United States
- Series A
- 187 employees
- Founded 2017
- 171Cell.Ai Inc.· Mumbai, Maharashtra, India
- Series A
- 184 employees
- Founded 2021
- 18Refeyn· Oxford, England, United Kingdom
- Series A
- 177 employees
- Founded 2018
- 19Treeline· Watertown, Massachusetts, United States
- Series A
- 162 employees
- Founded 2021
- 20迈博瑞生物膜技术(南通)有限公司· China
- Series A
- 154 employees
- Founded 2008
- 21Chenguang Biotech Group Co., Ltd· Handan, Hebei, China
- Series A
- 149 employees
- Founded 2005
- 22Rules-Based Medicine, an IQVIA business· Austin, Texas, United States
- Series A
- 142 employees
- Founded 2002
- 23Quantificare· United States
- Series A
- 124 employees
- Founded 2001
- 24Target RWE· Durham, North Carolina, United States
- Series A
- 122 employees
- Founded 2015
- 25Veritas Intercontinental· Madrid, Community of Madrid, Spain
- Series A
- 118 employees
- Founded 2018
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 889matching 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
Last refreshed: Thu, 07 May 2026 08:09:30 GMT
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