| OBGRF | Orbit Garant Drilling Inc | 0.7500 | 0.7500 | 0.7500 | 65.4K | -0.0400 | | 5.06 | |
| OERLY | Oc Oerlikon Corp Unsp/Adr | 13.05 | 13.05 | 13.05 | 100 | 0.65 | | 5.24 | |
| OFED | Oconee Federal Fincl Corp | 18.12 | 18.00 | 18.00 | 4.6K | -1.00 | | 5.26 | |
| OLVI | Oliveda International Inc | 0.2247 | 0.1944 | 0.1944 | 119.5K | -0.0303 | | 13.48 | |
| OMHI | Om Holdings International Inc | 0.0007 | 0.0007 | 0.0007 | 100 | -0.0003 | | 30.00 | |
| OMMSF | Omineca Mining & Mtls Ord | 0.0386 | 0.0369 | 0.0369 | 67.2K | 0.0018 | | 5.13 | |
| OPMXF | Operadora DE Sites Mexicn | 0.8940 | 0.8940 | 0.8940 | 300 | -0.0060 | | 0.67 | |
| ORLCF | Oracle Commodity Hldg Crp | 0.0193 | 0.0193 | 0.0193 | 300 | -0.0033 | | 14.60 | |
| OTLC | Oncotelic Therapeutcs Inc | 0.0250 | 0.0201 | 0.0210 | 274.7K | -0.0003 | | 1.41 | |
| OTMCF | Romios Gold Resources Inc | 0.1700 | 0.1700 | 0.1700 | 7.0K | -0.0351 | | 17.11 | |
| OXFYY | Oxford Nanopre Tech U/Adr | 9.710 | 9.710 | 9.710 | 300 | 0.270 | | 2.86 | |
| OZSC | Ozop Energy Solutions Inc | 0.0069 | 0.0050 | 0.0050 | 3.14M | -0.0015 | | 23.08 | |