| OBGRF | Orbit Garant Drilling Inc | 0.9730 | 0.7000 | 0.8500 | 52.0K | -0.1455 | | 14.62 | |
| OFED | Oconee Federal Fincl Corp | 17.51 | 17.51 | 17.51 | 100 | -0.49 | | 2.72 | |
| OLYFF | Olympia Financial Group Inc | 72.64 | 72.62 | 72.64 | 500 | -5.36 | | 6.88 | |
| OMHI | Om Holdings International Inc | 0.0002 | 0.0002 | 0.0002 | 7.0K | -0.0002 | | 50.00 | |
| OMMSF | Omineca Mining & Mtls Ord | 0.0476 | 0.0468 | 0.0468 | 18.0K | -0.0031 | | 6.21 | |
| ONVC | Online Vacation Ctr Hldgs | 2.000 | 2.000 | 2.000 | 1.1K | -0.050 | | 2.44 | |
| OPIRQ | Office Properties Income Trust 6.375% | 0.3100 | 0.3100 | 0.3100 | 400 | -0.7200 | | 69.90 | |
| OPITQ | Office Properties Income Trust | 0.0021 | 0.0010 | 0.0015 | 151.7K | -0.0010 | | 40.00 | |
| OPMXF | Operadora DE Sites Mexicn | 0.9450 | 0.9450 | 0.9450 | 300 | -0.0284 | | 2.92 | |
| ORLCF | Oracle Commodity Hldg Crp | 0.0235 | 0.0220 | 0.0220 | 35.5K | -0.0026 | | 10.57 | |
| OROVY | Orient Overseas Inr U/Adr | 78.40 | 78.20 | 78.20 | 1.1K | -11.51 | | 12.83 | |
| OTLC | Oncotelic Therapeutcs Inc | 0.0459 | 0.0427 | 0.0445 | 60.9K | 0.0017 | | 3.97 | |
| OTMCF | Romios Gold Resources Inc | 0.3930 | 0.3638 | 0.3930 | 10.2K | 0.0245 | | 6.65 | |
| OXFYY | Oxford Nanopre Tech U/Adr | 6.500 | 6.500 | 6.500 | 200 | -0.880 | | 11.92 | |
| OZSC | Ozop Energy Solutions Inc | 0.2000 | 0.1425 | 0.1500 | 50.0K | -0.0150 | | 9.09 | |