Funds, angels and corporates active in European rounds
| Investor | Type | Deals | Companies | Top sector | Active |
|---|---|---|---|---|---|
| One Up Sales | Venture capital | 1 | 1 | HRtech | 2024 |
| OneAccess | — | 1 | 1 | Cloud | 2017 |
| OneAdvent | Venture capital | 1 | 1 | Fintech | 2022 |
| oneAlpha | Venture capital | 1 | 1 | Fintech | 2022 |
| OneLife Ventures | Venture capital | 1 | 1 | Healthtech | 2021 |
| OneRagtime and the Rothschild family | — | 1 | 1 | Fintech | 2017 |
| OneRagtime Technology Fund | — | 1 | 1 | Software | 2017 |
| OneSpan | Venture capital | 1 | 1 | Software | 2025 |
| Online News Business | — | 1 | 1 | Fintech | 2017 |
| Only Holding | — | 1 | 1 | Software | 2013 |
| Onno Schüssler | Angel | 1 | 1 | Hardware | 2023 |
| Onno van de Stolpe | Angel | 1 | 1 | Healthtech | 2022 |
| Ono Venture Investment (OVI) | Venture capital | 1 | 1 | Healthtech | 2025 |
| Ontario Pension Board | — | 1 | 1 | Cleantech | 2017 |
| Ontdekkers Group | Venture capital | 1 | 1 | Deeptech | 2026 |
| Onur Atakay | — | 1 | 1 | Marketing | 2018 |
| Onur Erbay | Angel | 1 | 1 | E-commerce | 2023 |
| Onur Ergönen | Angel | 1 | 1 | Transportation | 2024 |
| Onur Kurugöl | Angel | 1 | 1 | Proptech | 2022 |
| Onur Yaşamtepe | Angel | 1 | 1 | Software | 2021 |
| Ooga Labs | — | 1 | 1 | Media | 2013 |
| Oost NL. Rubio Impact Ventures | Venture capital | 1 | 1 | Energy | 2026 |
| OP Advisory Services GmbH | — | 1 | 1 | Software | 2015 |
| OP Corporate Bank | Venture capital | 1 | 1 | Software | 2018 |
| OP Crypto Ventures | Venture capital | 1 | 1 | Fintech | 2023 |
