| OC | Olive Resource Capital Inc | 0.1200 | 0.1200 | 0.1200 | 4.5K | -0.0050 | | 4.00 | |
| OCO.WT | OROCO RESOURCES CORP WT EX 12SE | 0.1200 | 0.1200 | 0.1200 | 44.0K | 0.0050 | | 4.35 | |
| OML | Omni-Lite Industries Canada Inc | 2.890 | 2.840 | 2.890 | 3.3K | 0.090 | | 3.21 | |
| ORC.B | Orca Energy Group Inc Cl B | 2.360 | 2.350 | 2.350 | 4.2K | -0.030 | | 1.26 | |
| ORCL | Oracle Commodity Holding Corp | 0.0350 | 0.0300 | 0.0350 | 44.1K | 0.0050 | | 16.67 | |
| OTC | Ocumetics Technology Corp | 0.4700 | 0.4000 | 0.4700 | 110.7K | 0.0500 | | 11.90 | |