| Onzima Ventures PLC (ONZ) LSE - London Stock Exchange | |
| Opera Investments PLC (OPRA) LSE - London Stock Exchange | |
| Orchard Funding Group PLC (ORCH) LSE - London Stock Exchange | |
| Oryx International Growth Fund Limited (OIG) LSE - London Stock Exchange | |
| Otto Marine Ltd (BER) SGX - Singapore Exchange | |
| OPAL ENERGY CORP (OPA) CVE - Toronto TSX Ventures Exchange | |
| Octant Energy Corp (OEL.H) CVE - Toronto TSX Ventures Exchange | |
| One World Minerals Inc (OWI.H) CVE - Toronto TSX Ventures Exchange | |
| OneCap Investment Corp (OIC.H) CVE - Toronto TSX Ventures Exchange | |
| Open Gold Corp (OPG.H) CVE - Toronto TSX Ventures Exchange | |
| Oracle Mining Corp (OMN.H) CVE - Toronto TSX Ventures Exchange | |
| Orezone Gold Corp (ORE) CVE - Toronto TSX Ventures Exchange | |
| Organto Foods Inc (OGO) CVE - Toronto TSX Ventures Exchange | |
| ORLA MINING LTD (OLA) CVE - Toronto TSX Ventures Exchange | |
| Oxford Resources Inc (OXI.H) CVE - Toronto TSX Ventures Exchange | |