Carbon Direct Capital
New York, New York, United StatesFounded 2019
Carbon Direct Capital is a New York-based growth equity firm investing in carbon management, clean energy, and decarbonization technologies. It combines deep investment expertise with scientific and technical rigor to maximize climate impact and financial returns.
67% of their portfolio is in Climate & Energy. Deal activity increased 50% year-over-year (3 deals in the last 12 months). Average disclosed round size is $141.9M (across 11 rounds with reported amounts).
Portfolio
13
Fund Size
—
Top Stage
Series A
Last 12 Mo
3
Team
Joshua Dienstag
Chief Investment Officer
Au Le
Controller
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
15 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Neurophos | Series A | $110M | Jan 2026 |
 Sage Geosystems | Series B | — | Jan 2026 |
| SSage Geosystems, Inc. | Series B | $97M | Jan 2026 |
 Heirloom Carbon Technologies | Series B | — | Dec 2024 |
 Graphyte | Series A | — | Jul 2024 |
 Velocys | Growth | $40M | Jan 2024 |
 ION Clean Energy | Series A | $45M | Jan 2024 |
 Plasmonics | Series C | $76M | Nov 2022 |
| SSyzygy | Series C | $76M | Nov 2022 |
 Airco | Series A | $30M | Apr 2022 |
| AAir Company | Series A | $30M | Apr 2022 |
 Solugen | Series C | $350M | Sep 2021 |
| Solugen | Growth | $357M | — |
| Airco | Unknown | — | — |
| SSolugen | Series C | $350M | — |
Top Co-Investors
Toyota Ventures5 shared
Fifty Years3 shared
Baillie Gifford3 shared
Horizons Ventures2 shared
Hanaco Ventures2 shared
Evok Innovations2 shared
Equinor2 shared
Sumitomo Corporation of Americas2 shared
Chevron Technology Ventures2 shared
GIC Private Limited2 shared
Lowercarbon Capital2 shared
Refactor Capital2 shared
Breakthrough Energy Ventures2 shared
Ormat Technologies2 shared
SKY VC2 shared
Engine Ventures1 shared
Root Ventures1 shared
Alumni Ventures1 shared
Last updated: 9 September 2026