Quantum Capital Group (formerly Quantum Energy Partners) is a Houston-based private equity firm founded in 1998 that invests across the entire energy value chain, including oil & gas, energy infrastructure, thermal power & renewables, decarbonization, and energy technologies. The firm has stewarded over $30 billion of capital since inception.
38% of their portfolio is in Climate & Energy. Their most common stage is series-b (50% of deals). Average disclosed round size is $57.3M (across 13 rounds with reported amounts).
Portfolio
14
Fund Size
$5.3B
Top Stage
Series B
Last 12 Mo
0
Team
Keila Diamond
Managing Director and Head of ESG
Lane Neal
Managing Director – Technical
Rob Anderson
Managing Director
Alan Smith
Operating Partner
Alex Jackson
Partner
Bill Montgomery
Operating Partner
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
Portfolio
| Company | Round | Amount | Date |
|---|---|---|---|
| FFrontline | Seed | — | Jan 2024 |
 Orennia | Series B | $25M | Jul 2023 |
 Ardersier Port | Unknown | — | Jan 2023 |
 BeZero Carbon | Series B | $50M | Nov 2022 |
 Carbon Direct (Acq. Pachama) | Series C | $60M | Aug 2022 |
 Project Canary | Series B | $111M | Feb 2022 |
 Rigup | Series C | $60M | Jan 2019 |
 ChargePoint | Growth | $240M | Nov 2018 |
| Rigup | Series B | $15.8M | Feb 2018 |
| BBiPar Sciences, Inc. | Unknown | $20M | Jan 2009 |
| BBiPar Sciences | Series B | $35M | Feb 2007 |
| BBiPar Sciences, Inc. | Series B | $35M | Feb 2007 |
 BiPar | Series B | $35M | Feb 2007 |
| IIMI Intelligent Medical Implants | Series B | — | Oct 2006 |
 Apartment List | Unknown | $50M | — |
 Nubila | Seed | $8M | — |
Top Co-Investors
Last updated: 8 September 2026