| OC | Olive Resource Capital Inc | 0.1100 | 0.1100 | 0.1100 | 172.5K | 0.0050 | | 4.76 | |
| OCO.WT | OROCO RESOURCES CORP WT EX 12SE | 0.0600 | 0.0600 | 0.0600 | 32.0K | -0.0100 | | 14.29 | |
| ODV.WT.V | Osisko Development Corp WT V USD | 0.7700 | 0.6900 | 0.7700 | 2.5K | 0.0400 | | 5.48 | |
| OML | Omni-Lite Industries Canada Inc | 2.110 | 2.100 | 2.110 | 1.5K | 0.060 | | 2.93 | |
| OMM | Omineca Mining and Metals Ltd | 0.0500 | 0.0450 | 0.0450 | 8.0K | -0.0050 | | 10.00 | |
| ORC.B | Orca Energy Group Inc Cl B | 2.740 | 2.700 | 2.700 | 4.0K | -0.050 | | 1.82 | |
| OTC | Ocumetics Technology Corp | 0.4800 | 0.4700 | 0.4800 | 7.4K | -0.0200 | | 4.00 | |