# Top 50 CleanTech Angel Investors in May 2026

| Investor | Relevant Deals | Geography | Stage | Focus |
| --- | --- | --- | --- | --- |
| Biz Stone | 4 | United States, United Kingdom, India | Seed, Series A, Pre-Seed | Software, Messaging, Mobile |
| Paul Forster | 4 | United Kingdom, Germany, Spain | Seed, Series A, Pre-Seed | Software, FinTech, Financial Services |
| Chris Murphy | 3 | United States, Germany, United Kingdom | Seed, Pre-Seed, Series A | Software, SaaS, Information Technology |
| Uday Kumar Bangalore Shivaraman | 3 | United Kingdom, India, United States | Seed, Series B, Equity Crowdfunding | FinTech, Financial Services, E-Commerce |
| David E. Weekly | 3 | United States, Israel | Seed, Angel, Pre-Seed | Robotics, Drones, Aerospace |
| Kristjan Raude | 3 | Estonia, United States | Seed, Pre-Seed, Equity Crowdfunding | Consumer Electronics, Internet of Things, Software |
| Marc Tarpenning | 2 | United States | Series A, Seed, Series D | Renewable Energy, CleanTech, Drones |
| Vishal Rao | 2 | United States, India, Canada | Seed, Pre-Seed | Software, Artificial Intelligence, Information Technology |
| Tim Schumacher | 2 | Germany, Sweden, United States | Seed, Series A | Apps, Internet, SaaS |
| Gaurav Gupta | 2 | India | Angel | Solar, Energy, CleanTech |
| Sam Branson | 2 | United Kingdom | Seed, Series A | CleanTech, Laundry and Dry-cleaning |
| Jeff Bezos | 2 | United States, United Kingdom, India | Grant, Series B, Series A | Non Profit, Software, Communities |
| Ashley Mayer | 2 | United States, Germany | Seed, Series A, Pre-Seed | Wellness, Health Care, Natural Resources |
| Anshuman Bapna | 2 | India | Seed, Pre-Seed | CleanTech, Fashion, Medical |
| Ronald Cohen | 2 | Israel, United States, Poland | Series A, Seed | Health Care, Software, Artificial Intelligence |
| Daniel Recanati | 2 | Israel, United States, Brazil | Seed, Series B, Series A | Internet, Analytics, Advertising |
| Ali Omar | 2 | Finland, United States, Estonia | Seed, Pre-Seed, Angel | Software, SaaS, Artificial Intelligence |
| Serge Chiaramonte | 2 | United Kingdom, United States, China | Seed, Pre-Seed, Series A | FinTech, Financial Services, E-Commerce |
| Andrea Dusi | 2 | Italy, United States, United Kingdom | Seed, Pre-Seed, Series A | Biotechnology, Health Care, Information Technology |
| Rand Hindi | 2 | France, United States, Germany | Seed, Pre-Seed | Software, Cryptocurrency, Information Technology |
| Naveen Kshatriya | 2 | India | Seed, Angel | Solar, Energy, Finance |
| Rex Burgdorfer | 2 | United States, United Kingdom | Seed, Series A | Fashion, Real Estate, E-Commerce |
| Simon Rothman | 2 | United States, Spain | Series A, Seed, Series B | Transportation, Rental, Supply Chain Management |
| Holly Branson | 2 | United Kingdom | Seed, Series A | CleanTech, Logistics, Transportation |
| Edward Kim | 2 | United States | Angel | CleanTech, Clean Energy, Renewable Energy |
| Job Dura | 2 | The Netherlands | Series A | Energy, CleanTech, Architecture |
| Eugene Goldberg | 2 | United States | Angel | CleanTech, Clean Energy, Renewable Energy |
| Bill Gates | 2 | United States, Canada, Israel | Series A, Series C, Series B | Energy, Biotechnology, Manufacturing |
| Luke Kupersmith | 2 | United States | Angel | CleanTech, Clean Energy, Renewable Energy |
| Kai Hansen | 2 | Germany, United Kingdom, France | Seed, Series A, Pre-Seed | E-Commerce, FinTech, Software |
| Elon Musk | 2 | United States | Series A, Series B, Seed | FinTech, SMS, Transportation |
| Martin Olczyk | 2 | United Kingdom, Italy, France | Pre-Seed, Seed, Series A | Software, Information Technology, Artificial Intelligence |
| Madis Müür | 2 | Estonia, United States | Seed, Equity Crowdfunding, Pre-Seed | Apps, Smart Building, Marketing Automation |
| Matthias Ernst | 2 | Germany | Pre-Seed | CleanTech, Software, Clean Energy |
| Peter Mertens | 2 | Germany, Israel | Seed, Pre-Seed, Angel | Software, Automotive, Information Technology |
| David Helgason | 2 | United States, Denmark, Finland | Seed, Pre-Seed | Software, Gaming, Information Technology |
| Warren Buffett | 2 | United States, Taiwan, United Kingdom | Seed, Pre-Seed, Post-IPO Equity | Retail, Health Care, Health Diagnostics |
| Shashank Randev | 2 | India | Angel, Seed, Pre-Seed | FinTech, CleanTech, Education |
| Akshay Singhal | 2 | India, United States | Pre-Seed, Seed | Battery, Hardware, CleanTech |
| Jonathan Seaton | 2 | United States, United Kingdom, Canada | Seed, Pre-Seed | Software, Education, Internet |
| Chris Sang | 2 | United States, Australia, India | Seed, Pre-Seed, Series A | Software, E-Commerce, Mobile |
| Mark Cuban | 2 | United States, United Kingdom, Singapore | Seed, Series A | Software, Blockchain, Artificial Intelligence |
| Philipp Kloeckner | 2 | Germany | Seed, Angel | Financial Services, Banking, FinTech |
| Luigi Bajetti | 2 | United States, Italy, Luxembourg | Seed, Pre-Seed, Series A | Information Technology, Software, Apps |
| Simon Lancaster | 1 | United States | Seed, Angel, Pre-Seed | SaaS, Hardware, Wireless |
| Gerard George | 1 | Singapore | Pre-Seed | SaaS, Forestry, Internet |
| Bin Ge | 1 | China | Series A | CleanTech, Architecture, Environmental Engineering |
| Paul van Keep | 1 | The Netherlands | Seed | Travel, Software, CleanTech |
| José Manuel | 1 | Spain | Pre-Seed | Sustainability, Science and Engineering |
| Marcin Zukowski | 1 | Poland, United States, United Kingdom | Pre-Seed, Seed, Series A | Software, Apps, Manufacturing |

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