Funds, angels and corporates active in European rounds
| Investor | Type | Deals | Companies | Top sector | Active |
|---|---|---|---|---|---|
| OctaQuest | Venture capital | 2 | 2 | Energy | 2023–2024 |
| Octopus First Cheque Fund | Venture capital | 2 | 2 | Software | 2024–2026 |
| Oetker Collection | Venture capital | 2 | 2 | Cleantech | 2025–2026 |
| Ofek Venture Fund | Venture capital | 2 | 2 | Software | 2019–2020 |
| OIG Capital | Venture capital | 2 | 2 | Gaming | 2021–2024 |
| Okta Ventures | Venture capital | 2 | 2 | Fintech | 2021–2022 |
| OKX Ventures | Venture capital | 2 | 2 | Gaming | 2023–2024 |
| Olbia Invest | — | 2 | 2 | Software | 2017 |
| Olcayto Yiğit | Angel | 2 | 1 | Cleantech | 2022–2024 |
| Old Mutual Global Investors | — | 2 | 2 | E-commerce | 2017–2018 |
| Oleg Tikhturov | — | 2 | 2 | E-commerce | 2020–2023 |
| Oliver Cameron | Angel | 2 | 2 | AI | 2023–2025 |
| Oliver Heine | — | 2 | 2 | HRtech | 2020–2023 |
| Oliver Wyman | — | 2 | 2 | Software | 2017–2018 |
| Olivier Coune | Venture capital | 2 | 2 | Foodtech | 2018 |
| Olivier Pailhes | Angel | 2 | 2 | AI | 2021–2023 |
| Olivier van der Rest | Angel | 2 | 2 | Healthtech | 2022 |
| OLMA | Venture capital | 2 | 2 | Travel | 2022 |
| OLMA Private Equity Fund | — | 2 | 1 | Travel | 2018 |
| Olympe Capital | Venture capital | 2 | 2 | Software | 2025–2026 |
| Olympia Group | Venture capital | 2 | 2 | Cleantech | 2022–2023 |
| Oma Ventures | Venture capital | 2 | 2 | Cleantech | 2024 |
| Ombu Group | — | 2 | 1 | Cleantech | 2018–2020 |
| Ömer Aras | Angel | 2 | 2 | Marketing | 2021–2023 |
| Ömer Üstünel | Angel | 2 | 2 | Foodtech | 2022–2024 |
