| OC | Olive Resource Capital Inc | 0.1000 | 0.1000 | 0.1000 | 7.0K | -0.0050 | | 4.76 | |
| OCO.WT | OROCO RESOURCES CORP WT EX 12SE | 0.1500 | 0.1500 | 0.1500 | 10.0K | -0.0100 | | 6.25 | |
| ODV.WT.U | Osisko Development Corp Wts USD | 0.2750 | 0.2750 | 0.2750 | 9.0K | 0.0900 | | 48.65 | |
| ODV.WT.V | Osisko Development Corp WT V USD | 1.700 | 1.700 | 1.700 | 400 | -0.650 | | 27.66 | |
| OML | Omni-Lite Industries Canada Inc | 1.410 | 1.330 | 1.330 | 11.8K | -0.070 | | 5.00 | |
| OMM | Omineca Mining and Metals Ltd | 0.0800 | 0.0750 | 0.0800 | 313.3K | 0.0050 | | 6.67 | |
| OMR.H | Ord Mountain Resources Corp | 0.0900 | 0.0800 | 0.0800 | 262.0K | 0.0100 | | 14.29 | |
| ORCL | Oracle Commodity Holding Corp | 0.0500 | 0.0450 | 0.0500 | 169.4K | 0.0050 | | 11.11 | |
| OTC | Ocumetics Technology Corp | 0.4200 | 0.4100 | 0.4100 | 2.2K | -0.0100 | | 2.38 | |