Grantham Foundation
Boston, Massachusetts, United StatesFounded 1997
The Grantham Foundation for the Protection of the Environment is a Boston-based private foundation established by Jeremy and Hannelore Grantham that invests in early-stage climate and green technology ventures, often through its environmental venture capital vehicle Neglected Climate Opportunities LLC.
72% of their portfolio is in Climate & Energy. Deal activity decreased year-over-year (1 deal in the last 12 months vs 5 prior). Their most common stage is series-a (44% of deals). Average disclosed round size is $17.8M (across 25 rounds with reported amounts).
Portfolio
27
Fund Size
—
Top Stage
Series A
Last 12 Mo
1
Team
RR
Ramsay Ravenel
President and CIO
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
32 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Avalanche Energy | Series A | $29M | Feb 2026 |
 Inventwood | Series A | $15M | Apr 2025 |
 Vema Hydrogen | Seed | $13M | Feb 2025 |
 Paebbl | Series A | — | Oct 2024 |
 Allegro Energy | Series A | — | Sep 2024 |
 Switch Bioworks | Seed | $17M | Sep 2024 |
| Inventwood | Seed | $8M | Aug 2024 |
 Climate Robotics | Series A | $21.5M | Aug 2024 |
 Applied Carbon | Series A | $21.5M | Jul 2024 |
 Fervo Energy | Series C | — | Feb 2024 |
| Climate Robotics | Series A | $21.5M | Jan 2024 |
 Pluton Biosciences | Series A | $16.5M | May 2023 |
 Type One Energy | Seed | $29M | Mar 2023 |
 Summit Nanotech | Unknown | $50M | Jan 2023 |
 nT-Tao | Series A | $22M | Jan 2023 |
 Ocean Rainforest | Unknown | — | Jan 2023 |
| Paebbl | Seed | — | Oct 2022 |
 NAPIGEN | Seed | $7.8M | Jul 2022 |
 Brilliant Planet | Series A | $12M | Apr 2022 |
 Travertine Technologies | Seed | $8.5M | Jan 2022 |
| Pluton Biosciences | Seed | $6.6M | Oct 2021 |
 Lilac | Series A | $20M | Jan 2020 |
 Hazel Technologies | Series B | $13M | Aug 2019 |
 Banyu Carbon | Seed | $6.5M | — |
 Cache Energy | Seed | $8.5M | — |
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Top Co-Investors
Congruent Ventures6 shared
S2G Ventures5 shared
RA Capital Management4 shared
Builders Vision3 shared
Fall Line Capital3 shared
First In3 shared
Toyota Ventures3 shared
Anglo American3 shared
Overture VC3 shared
Wireframe Ventures3 shared
TELUS Pollinator Fund for Good3 shared
Lowercarbon Capital3 shared
Capnamic Ventures2 shared
Pale Blue Dot2 shared
Elemental Impact2 shared
MUUS Climate Partners2 shared
Radicle Growth2 shared
Illumina Ventures2 shared
iSelect Fund2 shared
Last updated: 7 October 2026