| OBGRF | Orbit Garant Drilling Inc | 1.720 | 1.710 | 1.720 | 5.2K | 0.280 | | 19.44 | |
| OFED | Oconee Federal Fincl Corp | 15.71 | 15.71 | 15.71 | 300 | 0.61 | | 4.04 | |
| OLVI | Oliveda International Inc | 0.2795 | 0.2465 | 0.2795 | 4.4K | 0.0146 | | 5.51 | |
| OMHI | Om Holdings International Inc | 0.0004 | 0.0004 | 0.0004 | 40.0K | 0.0002 | | 100.00 | |
| OMMSF | Omineca Mining & Mtls Ord | 0.0559 | 0.0501 | 0.0535 | 201.0K | -0.0058 | | 9.78 | |
| ONVC | Online Vacation Ctr Hldgs | 2.175 | 2.025 | 2.025 | 600 | -0.075 | | 3.57 | |
| OPIRQ | Office Properties Income Trust 6.375% | 1.200 | 1.200 | 1.200 | 2.9K | 0.050 | | 4.35 | |
| OPITQ | Office Properties Income Trust | 0.0011 | 0.0011 | 0.0011 | 13.6K | -0.0119 | | 91.54 | |
| OPMXF | Operadora DE Sites Mexicn | 0.8300 | 0.8300 | 0.8300 | 10.7K | 0.0088 | | 1.07 | |
| ORLCF | Oracle Commodity Hldg Crp | 0.0364 | 0.0250 | 0.0364 | 1.0K | 0.0008 | | 2.25 | |
| OROVY | Orient Overseas Inr U/Adr | 97.91 | 97.91 | 97.91 | 100 | -0.79 | | 0.80 | |
| OTLC | Oncotelic Therapeutcs Inc | 0.0450 | 0.0432 | 0.0439 | 25.7K | 0.0009 | | 2.09 | |
| OTMCF | Romios Gold Resources Inc | 0.4607 | 0.4250 | 0.4533 | 50.9K | 0.0283 | | 6.66 | |
| OXFYY | Oxford Nanopre Tech U/Adr | 6.900 | 6.900 | 6.900 | 200 | -0.240 | | 3.36 | |
| OZSC | Ozop Energy Solutions Inc | 0.1400 | 0.0730 | 0.1168 | 39.4K | -0.0197 | | 14.43 | |
| OZSCD | Ozop Energy Solutions New | 0.1700 | 0.1100 | 0.1248 | 28.4K | -0.0091 | | 6.80 | |