| OBSJF | Obrascon Huarte Lain Brasil S.A. | 0.5100 | 0.5100 | 0.5100 | 8.0K | 0.0392 | | 8.33 | |
| OERLY | Oc Oerlikon Corp Unsp/Adr | 10.15 | 10.15 | 10.15 | 300 | -0.19 | | 1.84 | |
| OFED | Oconee Federal Fincl Corp | 15.71 | 15.71 | 15.71 | 300 | 0.61 | | 4.04 | |
| OLVI | Oliveda International Inc | 0.3945 | 0.3200 | 0.3500 | 1.6K | -0.0446 | | 11.30 | |
| OMHI | Om Holdings International Inc | 0.0004 | 0.0004 | 0.0004 | 40.0K | 0.0002 | | 100.00 | |
| OMMSF | Omineca Mining & Mtls Ord | 0.0590 | 0.0544 | 0.0544 | 34.0K | 0.0001 | | 0.18 | |
| ONVC | Online Vacation Ctr Hldgs | 2.175 | 2.025 | 2.025 | 600 | -0.075 | | 3.57 | |
| OPIRQ | Office Properties Income Trust 6.375% | 0.0510 | 0.0126 | 0.0510 | 1.2K | -1.0490 | | 95.36 | |
| OPITQ | Office Properties Income Trust | 0.0130 | 0.0100 | 0.0120 | 434.9K | 0.0070 | | 140.00 | |
| OPMXF | Operadora DE Sites Mexicn | 0.8142 | 0.8142 | 0.8142 | 200 | 0.0247 | | 3.13 | |
| ORLCF | Oracle Commodity Hldg Crp | 0.0322 | 0.0322 | 0.0322 | 2.3K | 0.0008 | | 2.55 | |
| OROVY | Orient Overseas Inr U/Adr | 91.00 | 91.00 | 91.00 | 100 | -6.91 | | 7.05 | |
| OTLC | Oncotelic Therapeutcs Inc | 0.0348 | 0.0300 | 0.0348 | 937.7K | 0.0022 | | 6.75 | |
| OTMCF | Romios Gold Resources Inc | 0.4950 | 0.4950 | 0.4950 | 5.0K | 0.0090 | | 1.85 | |
| OXFYY | Oxford Nanopre Tech U/Adr | 6.900 | 6.900 | 6.900 | 200 | -0.240 | | 3.36 | |
| OZSC | Ozop Energy Solutions Inc | 0.1000 | 0.0660 | 0.0800 | 36.6K | -0.0134 | | 14.35 | |
| OZSCD | Ozop Energy Solutions New | 0.1700 | 0.1100 | 0.1248 | 28.4K | -0.0091 | | 6.80 | |