| OC | Olive Resource Capital Inc | 0.1250 | 0.1000 | 0.1100 | 361.5K | 0.0100 | | 10.00 | |
| OCO.WT | OROCO RESOURCES CORP WT EX 12SE | 2.9800 | 0.3400 | 0.3900 | 103.7K | 0.0900 | | 30.00 | |
| ODV.WT.V | Osisko Development Corp WT V USD | 1.700 | 1.650 | 1.700 | 13.9K | 0.190 | | 12.58 | |
| OMM | Omineca Mining and Metals Ltd | 0.1000 | 0.0850 | 0.0850 | 534.7K | -0.0150 | | 15.00 | |
| ORC.B | Orca Energy Group Inc Cl B | 3.530 | 3.530 | 3.530 | 600 | -0.030 | | 0.84 | |
| ORCL | Oracle Commodity Holding Corp | 0.0700 | 0.0550 | 0.0650 | 977.2K | 0.0100 | | 18.18 | |
| OTC | Ocumetics Technology Corp | 0.6100 | 0.6000 | 0.6000 | 14.0K | -0.0100 | | 1.64 | |