Most Active Biotech Investors in Boston 2026

15 firms writing Biotech checks in Boston, led by Sofinnova Investments, Atlas Venture, Casdin Capital — ranked by verified deal count with the companies.

Biotech in Boston accounts for 34 tracked companies with verified cap-table data, 34 of which disclose round sizes totalling $7.7B. The median disclosed raise is $144M, and the largest is Kailera Therapeutics at $1.6B, ahead of Odyssey Therapeutics ($726M) and Astria Therapeutics ($700M).

The names that recur most often on these biotech cap tables are Alexandria Venture Investments (5 companies), Cormorant Asset Management (5 companies), Janus Henderson Investors (5 companies), Atlas Venture (4 companies), ARCH Venture Partners (4 companies), Sanofi Ventures (4 companies). By latest disclosed round, the market skews Series A (19), Series B (7), Series D (2), Growth (2).

Best funded Biotech in Boston companies

  1. Kailera Therapeutics — $1.6B (latest: IPO)
  2. Odyssey Therapeutics — $726M (latest: Series D)
  3. Astria Therapeutics — $700M (latest: Growth)
  4. Scorpion Therapeutics — $515M (latest: Series D)
  5. Beeline Medicines — $426M (latest: Series A)
  6. Seaport Therapeutics — $330M (latest: Series A)
  7. Dewpoint Therapeutics — $287M (latest: Series C)
  8. Atalanta Therapeutics — $262M (latest: Series B)
  9. Emulate — $225M (latest: Series E)
  10. ROME Therapeutics — $199M (latest: Series B)
  11. Antares Therapeutics — $177M (latest: Series A)
  12. Aktis Oncology — $175M (latest: Series B)
  13. Ampersand Biomedicines — $165M (latest: Series B)
  14. Third Arc Bio — $165M (latest: Series A)
  15. Axonis Therapeutics — $157M (latest: Series A)

Sector × city funding reports (20)

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•By Alejandro Cremades