Most Active Climate Investors in Boston 2026

6 firms writing Climate checks in Boston, led by Blumberg Capital, Stage 1 Ventures, Bessemer Venture Partners — ranked by verified deal count.

Climate in Boston accounts for 9 tracked companies with verified cap-table data, 9 of which disclose round sizes totalling $1.4B. The median disclosed raise is $90M, and the largest is Tomorrow.io at $500M, ahead of Boston Metal ($370M) and Enko Chem, Inc. ($150M).

The names that recur most often on these climate cap tables are Stonecourt Capital (1 company), HarbourVest Partners (1 company), Activate Capital (1 company), RTX Ventures (1 company), Seraphim Space (1 company), Chemonics (1 company). By latest disclosed round, the market skews Series C (3), Growth (2), Series B (2), Series A (1).

Companies tracked: 9
Disclosed funding total: $1.4B across 9 companies
Median disclosed raise: $90M
Largest raise: Tomorrow.io — $500M
Stage mix: Series C 3 · Growth 2 · Series B 2 · Series A 1
Most recent dated round: 2026-02-01

Best funded Climate in Boston companies

Tomorrow.io — $500M (latest: Growth)
Boston Metal — $370M (latest: Growth)
Enko Chem, Inc. — $150M (latest: Series C)
Allonnia — $109M (latest: Series A)
Actnano — $90M (latest: Series C)
Raptor Maps — $64M (latest: Series C)
Nth Cycle — $53M (latest: Series B)
Freight Farms — $48M (latest: Series B)
Kula Bio — $10M (latest: Seed)

Sector × city funding reports (20)

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