Most Active Biotech Investors in Waltham 2026

10 firms writing Biotech checks in Waltham, led by Atlas Venture, North Bridge Venture Partners & Growth Equity.

Biotech in Waltham accounts for 3 tracked companies with verified cap-table data, 3 of which disclose round sizes totalling $430M. The median disclosed raise is $125M, and the largest is Affinia Therapeutics at $210M, ahead of Jade Biosciences ($125M) and Xilio Therapeutics ($95M).

The names that recur most often on these biotech cap tables are RA Capital Management (2 companies), Atlas Venture (2 companies), New Enterprise Associates (NEA) (1 company), Eli Lilly and Company (1 company), EcoR1 Capital (1 company), Farallon Capital Management (1 company). By latest disclosed round, the market skews Series B (1), Series C (1).

Best funded Biotech in Waltham companies

  1. Affinia Therapeutics — $210M (latest: Series B)
  2. Jade Biosciences — $125M
  3. Xilio Therapeutics — $95M (latest: Series C)

Sector × city funding reports (20)

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•By Alejandro Cremades