Refolk

Series A Biotech companies in Boston

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

Built from a search like: Top Series A Biotech companies in Boston

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

  1. 1
    Soufflé Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 80 employees
    • Founded 2021
  2. 2
    Kelonia Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 66 employees
    • Founded 2017
  3. 3
    Manifold Bio· Boston, Massachusetts, United States
    • Series A
    • 65 employees
    • Founded 2020
  4. 4
    Protein Metrics, LLC· Boston, Massachusetts, United States
    • Series A
    • 58 employees
    • Founded 2011
  5. 5
    PhaseV· Boston, Massachusetts, United States
    • Series A
    • 53 employees
    • Founded 2023
  6. 6
    Ascidian Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 48 employees
    • Founded 2020
  7. 7
    Spear Bio· Boston, Massachusetts, United States
    • Series A
    • 48 employees
    • Founded 2021
  8. 8
    Delve Bio· Boston, Massachusetts, United States
    • Series A
    • 44 employees
    • Founded 2022
  9. 9
    ArkeaBioTM· Boston, Massachusetts, United States
    • Series A
    • 40 employees
    • Founded 2021
  10. 10
    Magnet Biomedicine· Boston, Massachusetts, United States
    • Series A
    • 39 employees
    • Founded 2019
  11. 11
    AI Proteins· Boston, Massachusetts, United States
    • Series A
    • 38 employees
    • Founded 2021
  12. 12
    Genialis· Boston, Massachusetts, United States
    • Series A
    • 33 employees
    • Founded 2015
  13. 13
    DeepCure· Boston, Massachusetts, United States
    • Series A
    • 31 employees
    • Founded 2018
  14. 14
    Sensorium Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 26 employees
    • Founded 2021
  15. 15
    Axonis Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 25 employees
    • Founded 2019
  16. 16
    Newleos Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 25 employees
    • Founded 2024
  17. 17
    Syntis Bio· Boston, Massachusetts, United States
    • Series A
    • 24 employees
    • Founded 2022
  18. 18
    Xellar Biosystems· Boston, Massachusetts, United States
    • Series A
    • 22 employees
    • Founded 2022
  19. 19
    Hillstar Bio· Boston, Massachusetts, United States
    • Series A
    • 19 employees
    • Founded 2023
  20. 20
    Rectify Pharma· Boston, Massachusetts, United States
    • Series A
    • 18 employees
    • Founded 2020
  21. 21
    Bambusa Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 18 employees
    • Founded 2024
  22. 22
    Carbon Biosciences· Boston, Massachusetts, United States
    • Series A
    • 16 employees
    • Founded 2021
  23. 23
    NextRNA Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 11 employees
    • Founded 2020
  24. 24
    Poplar Therapeutics· Boston, Massachusetts, United States
    • Series A
    • 11 employees
    • Founded 2024
  25. 25
    Catamaran Bio· Boston, Massachusetts, United States
    • Series A
    • 10 employees
    • Founded 2020

Find engineers at Series A Biotech companies in Boston

Searching for “engineers at top Series A Biotech companies in Boston” surfaces this slice of the market. The list above ranks Biotech companies headquartered in Boston whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. With 31 matching companies in our index, this is a tight read on where the Biotech talent in Boston is heating up.

Three filters at once narrows the field hard. The companies that survive all three — Series A, Biotech, in Boston — 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 Boston hiring” or “founders of Series A Biotech companies in Boston 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 Boston 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: Thu, 07 May 2026 08:10:06 GMT

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