| 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 | |
| OKCTF | Okinawa Cellular Tele Ord | 24.27 | 24.27 | 24.27 | 100 | -0.35 | | 1.25 | |
| OLVI | Oliveda International Inc | 0.2247 | 0.2247 | 0.2247 | 500 | 0.0026 | | 1.17 | |
| 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 | 0.9236 | 0.9000 | 0.9000 | 4.1K | -0.0207 | | 2.25 | |
| ORLCF | Oracle Commodity Hldg Crp | 0.0226 | 0.0226 | 0.0226 | 400 | 0.0004 | | 1.80 | |
| OROVY | Orient Overseas Inr U/Adr | 97.80 | 97.80 | 97.80 | 400 | -12.30 | | 11.17 | |
| OTLC | Oncotelic Therapeutcs Inc | 0.0229 | 0.0201 | 0.0213 | 1.38M | -0.0007 | | 3.18 | |
| OTMCF | Romios Gold Resources Inc | 0.2083 | 0.2000 | 0.2051 | 22.5K | -0.0219 | | 9.65 | |
| OXFYY | Oxford Nanopre Tech U/Adr | 9.710 | 9.710 | 9.710 | 300 | 0.270 | | 2.86 | |
| OZSC | Ozop Energy Solutions Inc | 0.0075 | 0.0059 | 0.0065 | 2.61M | -0.0010 | | 13.33 | |