# Top 50 CleanTech Angel Investors in June 2026

| Investor | Relevant Deals | Geography | Stage | Focus |
| --- | --- | --- | --- | --- |
| Paul Forster | 4 | United Kingdom, Germany, United States | Seed, Series A, Pre-Seed | Software, FinTech, Financial Services |
| Biz Stone | 4 | United States, United Kingdom, India | Seed, Series A, Pre-Seed | Software, Apps, Mobile |
| Chris Murphy | 3 | United States, Germany, Denmark | Seed, Pre-Seed, Series A | Software, SaaS, Information Technology |
| Christian Kaar | 3 | Austria, United Kingdom | Seed, Angel | Apps, Software, Information Technology |
| David E. Weekly | 3 | United States, Israel | Seed, Angel, Pre-Seed | Drones, Robotics, Aerospace |
| Uday Kumar Bangalore Shivaraman | 3 | United Kingdom, India, United States | Seed, Series B, Equity Crowdfunding | FinTech, Financial Services, E-Commerce |
| Kristjan Raude | 3 | Estonia, United States | Seed, Pre-Seed, Equity Crowdfunding | Software, Automotive, Internet of Things |
| Kai Hansen | 3 | Germany, United Kingdom, Italy | Seed, Series A, Pre-Seed | Software, E-Commerce, FinTech |
| David Rowan | 3 | United Kingdom, Croatia, Germany | Seed, Pre-Seed | Software, Machine Learning, Information Technology |
| Justin Hamilton | 2 | United States, India, Canada | Seed, Pre-Seed, Series A | Environmental Engineering, Aerospace, CleanTech |
| Matthias Ernst | 2 | Germany | Pre-Seed | CleanTech, Software, Clean Energy |
| Bhavik Bajaj | 2 | United States, Switzerland, United Kingdom | Pre-Seed, Seed, Angel | Information Technology, Software, FinTech |
| Kathy Fields | 2 | United States | Series A, Seed, Series B | Water, CleanTech, Health Care |
| Bill Gates | 2 | United States, Canada, Israel | Series C, Series A, Series B | Energy, Biotechnology, Manufacturing |
| Peter Mertens | 2 | Germany, Israel | Seed, Pre-Seed, Angel | Software, Automotive, CleanTech |
| Shashank Randev | 2 | India | Angel, Seed, Pre-Seed | FinTech, SaaS, CleanTech |
| Marc Tarpenning | 2 | United States, France, Denmark | Series A, Seed, Series D | Renewable Energy, Drones, Robotics |
| Gaurav Gupta | 2 | India | Angel | Solar, Energy, CleanTech |
| Edward Kim | 2 | United States | Angel | CleanTech, Clean Energy, Renewable Energy |
| Leopold König | 2 | Germany | Seed | Battery, CleanTech, Chemical Engineering |
| Rand Hindi | 2 | France, United States, Germany | Seed, Pre-Seed | Software, Cryptocurrency, Information Technology |
| Serge Chiaramonte | 2 | United Kingdom, United States, France | Seed, Pre-Seed | FinTech, Financial Services, Information Technology |
| Andrea Dusi | 2 | Italy, United States, United Kingdom | Seed, Pre-Seed, Series A | Biotechnology, Health Care, CleanTech |
| Torge Thönnessen | 2 | Germany | Seed | Battery, CleanTech, Chemical Engineering |
| Akshay Singhal | 2 | India, United States | Seed, Pre-Seed | Pet, AgTech, Battery |
| Sir Ronald Cohen | 2 | Israel, United States, United Kingdom | Series A, Seed | Health Care, Financial Services, Apps |
| Mark Cuban | 2 | United States, United Kingdom, Canada | Seed, Series A | Software, Artificial Intelligence, Blockchain |
| Chris Sang | 2 | United States, Australia, India | Seed, Pre-Seed, Series A | Software, E-Commerce, SaaS |
| Karim Tabet Jalbout | 2 | Germany | Seed | Battery, CleanTech, Chemical Engineering |
| Maximilian Odendahl | 2 | Germany, United Kingdom | Seed, Series A | Battery, CleanTech, Chemical Engineering |
| Job Dura | 2 | The Netherlands | Series A | Energy, CleanTech, Architecture |
| Elon Musk | 2 | United States, Japan | Series A, Series B, Pre-Seed | Apps, FinTech, Cryptocurrency |
| Eugene Goldberg | 2 | United States | Angel | CleanTech, Clean Energy, Renewable Energy |
| Markku Jääskelainen | 2 | Estonia | Seed, Series A | Drones, Big Data, Software |
| Alfred Luger | 2 | Austria, Germany, United Kingdom | Seed, Angel, Pre-Seed | Software, Apps, E-Learning |
| Luke Kupersmith | 2 | United States | Angel | CleanTech, Clean Energy, Renewable Energy |
| Rex Burgdorfer | 2 | United States, United Kingdom | Seed, Series A | Fashion, Real Estate, Software |
| Elizabeth Cutler | 2 | United States | Seed, Series A, Pre-Seed | Women's, E-Commerce, Health Care |
| Garrett Camp | 2 | United States, Poland, Germany | Seed, Series A | Software, Logistics, Apps |
| Ashley Mayer | 2 | United States, Germany | Seed, Series A, Pre-Seed | Wellness, Health Care, Drones |
| Ali Omar | 2 | Finland, United States, Estonia | Seed, Pre-Seed, Angel | Software, SaaS, Artificial Intelligence |
| Holly Branson | 2 | United Kingdom | Seed, Pre-Seed, Series A | Energy, CleanTech, Logistics |
| Anna Alex | 2 | Germany, France | Pre-Seed, Seed | Software, CleanTech, Information Technology |
| Madis Müür | 2 | Estonia, United States | Seed, Equity Crowdfunding, Pre-Seed | Apps, Cycling, Security |
| Guilherme Kudiess | 2 | Brazil | Pre-Seed, Seed | Artificial Intelligence, SaaS, CleanTech |
| Vishal Rao | 2 | United States, India, Canada | Seed, Pre-Seed | Software, Artificial Intelligence, Information Technology |
| Luigi Bajetti | 2 | United States, Italy, Luxembourg | Pre-Seed, Seed, Series A | Software, Information Technology, Apps |
| Jonathan Seaton | 2 | United States, United Kingdom, Canada | Seed, Pre-Seed | Software, Education, Music |
| David Helgason | 2 | United States, Denmark, Finland | Seed, Series A | Software, Gaming, Information Technology |
| Warren Buffett | 2 | United States, Ghana, Brazil | Seed, Pre-Seed, Series A | Health Care, Software, Health Diagnostics |