| OC | Olive Resource Capital Inc | 0.1150 | 0.1100 | 0.1150 | 54.0K | 0.0050 | | 4.55 | |
| 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 | 2.100 | 2.090 | 2.090 | 1.8K | 0.030 | | 1.46 | |
| OMM | Omineca Mining and Metals Ltd | 0.0550 | 0.0450 | 0.0550 | 42.1K | 0.0050 | | 10.00 | |
| ORC.B | Orca Energy Group Inc Cl B | 2.660 | 2.650 | 2.650 | 3.8K | -0.040 | | 1.49 | |
| OTC | Ocumetics Technology Corp | 0.4500 | 0.4400 | 0.4500 | 7.4K | 0.0100 | | 2.27 | |