| OC | Olive Resource Capital Inc | 0.0700 | 0.0650 | 0.0650 | 1.24M | -0.0050 | | 7.14 | |
| OCG | Outcrop Silver & Gold Corp | 0.3100 | 0.2800 | 0.2800 | 2.25M | -0.0350 | | 11.11 | |
| ODV.WT.B | Osisko Development Corp Wts B | 0.0350 | 0.0350 | 0.0350 | 5.0K | -0.0600 | | 63.16 | |
| ODV.WT.U | Osisko Development Corp Wts USD | 0.2100 | 0.2100 | 0.2100 | 1.8K | -0.0250 | | 10.64 | |
| ODV.WT.V | Osisko Development Corp WT V USD | 1.090 | 1.090 | 1.090 | 200.0K | -0.150 | | 12.10 | |
| OML | Omni-Lite Industries Canada Inc | 1.870 | 1.850 | 1.850 | 9.2K | 0.030 | | 1.65 | |
| OMM | Omineca Mining and Metals Ltd | 0.0550 | 0.0550 | 0.0550 | 260.2K | -0.0050 | | 8.33 | |
| ORC.B | Orca Energy Group Inc Cl B | 3.350 | 3.350 | 3.350 | 725 | -0.100 | | 2.90 | |
| ORCL | Oracle Commodity Holding Corp | 0.0550 | 0.0450 | 0.0450 | 191.1K | -0.0100 | | 18.18 | |