Funds, angels and corporates active in European rounds
| Investor | Type | Deals | Companies | Top sector | Active |
|---|---|---|---|---|---|
| Octopus Energy | Investment firm | 3 | 3 | Energy | 2022–2024 |
| OHB Venture Capital | Venture capital | 3 | 2 | Agritech | 2022–2023 |
| The Öhman Group | Corporate | 3 | 1 | Telecom | 2021–2025 |
| OION - Oxford Investment Opportunity Network | — | 3 | 3 | Healthtech | 2017–2022 |
| OKG Capital | Venture capital | 3 | 3 | Healthtech | 2023–2026 |
| OKS Group | — | 3 | 3 | Marketing | 2021–2022 |
| Olav Sehlbach | Angel | 3 | 3 | Edtech | 2022–2023 |
| The Olayan Group | Venture capital | 3 | 1 | Software | 2021–2024 |
| Ole Andersen | — | 3 | 3 | Software | 2016–2024 |
| Oleka Capital | Venture capital | 3 | 3 | E-commerce | 2025–2026 |
| Oliver Merkel | Angel | 3 | 3 | Software | 2022–2025 |
| Olivier Bonnet | Angel | 3 | 3 | Healthtech | 2022–2025 |
| OLX | Venture capital | 3 | 2 | Consumer | 2018–2022 |
| OMR | — | 3 | 3 | Fintech | 2021–2023 |
| One Creation | — | 3 | 3 | Healthtech | 2019–2023 |
| OpenSea Ventures | Venture capital | 3 | 3 | Software | 2022 |
| OpenT | Venture capital | 3 | 3 | Software | 2025–2026 |
| Oppenheimer & Co. | Venture capital | 3 | 2 | Healthtech | 2018–2023 |
| OPRTRS | Venture capital | 3 | 3 | AI | 2025–2026 |
| Ora Global | Venture capital | 3 | 3 | Cybersecurity | 2025–2026 |
| Oren Zeev | — | 3 | 3 | Wellness & Beauty | 2012–2020 |
| Origins | Venture capital | 3 | 2 | Transportation | 2022–2025 |
| Oryon Universal | Venture capital | 3 | 3 | AI | 2021–2024 |
| Orza Investments | — | 3 | 3 | Robotics | 2016–2021 |
| Oscarson Invest | — | 3 | 3 | Sports | 2016–2021 |
