| OBGRF | Orbit Garant Drilling Inc | 1.369 | 1.369 | 1.369 | 800 | 0.069 | | 5.34 | |
| OBSJF | Obrascon Huarte Lain Brasil S.A. | 0.5763 | 0.5763 | 0.5763 | 67.7K | 0.0663 | | 13.00 | |
| OERLY | Oc Oerlikon Corp Unsp/Adr | 8.700 | 8.660 | 8.660 | 2.0K | 0.640 | | 7.98 | |
| OFED | Oconee Federal Fincl Corp | 16.00 | 15.75 | 16.00 | 2.6K | 0.25 | | 1.59 | |
| OKEPF | Okinawa Electric Power Co. | 6.550 | 6.550 | 6.550 | 600 | 0.075 | | 1.16 | |
| OLVI | Oliveda International Inc | 0.2580 | 0.2226 | 0.2500 | 76.1K | 0.0050 | | 2.04 | |
| OMMSF | Omineca Mining & Mtls Ord | 0.0566 | 0.0546 | 0.0566 | 49.9K | 0.0068 | | 13.65 | |
| OPMXF | Operadora DE Sites Mexicn | 0.8877 | 0.8877 | 0.8877 | 1.0K | -0.0323 | | 3.51 | |
| ORLCF | Oracle Commodity Hldg Crp | 0.0290 | 0.0290 | 0.0290 | 108.0K | 0.0021 | | 7.81 | |
| OROVY | Orient Overseas Inr U/Adr | 90.84 | 90.84 | 90.84 | 300 | 0.11 | | 0.12 | |
| OTLC | Oncotelic Therapeutcs Inc | 0.0390 | 0.0364 | 0.0377 | 464.9K | 0.0003 | | 0.80 | |
| OTMCF | Romios Gold Resources Inc | 0.4300 | 0.4300 | 0.4300 | 200 | -0.0100 | | 2.27 | |
| OXFYY | Oxford Nanopre Tech U/Adr | 6.500 | 6.500 | 6.500 | 300 | 0.500 | | 8.33 | |
| OZSC | Ozop Energy Solutions Inc | 0.3498 | 0.2600 | 0.2734 | 52.6K | 0.0134 | | 5.15 | |