- North Sky Capital
- Novastar Ventures
- Nysnø
- Obvious Ventures
- Ocean Born Impact
- OGCI (Oil and Gas Climate Initiative)
- Open Value Foundation
- Orange Ridge Capital
- ORAXYS Environmental Private Equity
- Orbia Ventures
- overture ventures
- P Capital Partners
- Pale Blue Dot
- Partech
- Phimpact Investments
- Piva Capital
- Planet A Ventures
- Planet First Partners
- Planet Rise
- Plug and Play Tech
