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| Companies | |||
| Optionsxpress Holdings | OXPS | Quote | News |
| Optium Corp. | OPTM | Quote | News |
| Oracle Corporation | ORCL | Quote | News |
| Orange 21 Inc | ORNG | Quote | News |
| Orasure Technologies Inc | OSUR | Quote | News |
| Orbcomm Inc. | ORBC | Quote | News |
| Orbit International Corp. | ORBT | Quote | News |
| ORBOTECH | ORBK | Quote | News |
| Orchid Cellmark Inc | ORCH | Quote | News |
| ORCKIT COMMUNIC | ORCT | Quote | News |
| Origen Financial Inc | ORGN | Quote | News |
| Origin Agritech Ltd | SEED | Quote | News |
| Oritani Financial Corp. | ORIT | Quote | News |
| Orthofix International | OFIX | Quote | News |
| OrthoLogic Corp. | OLGC | Quote | News |
| Orthovita | VITA | Quote | News |
| Oscient Pharmaceuticals Corp. | OSCI | Quote | News |
| Osi Pharmaceuticals | OSIP | Quote | News |
| Osi Systems | OSIS | Quote | News |
| Osiris Therapeutics Inc. | OSIR | Quote | News |
| Osteotech Inc | OSTE | Quote | News |
| Otter Tail Power | OTTR | Quote | News |
| Outdoor Channel Holdings Inc | OUTD | Quote | News |
| Overland Storage Inc | OVRL | Quote | News |
| Overstock.Com | OSTK | Quote | News |
| Oxigene | OXGN | Quote | News |
| Oyo Geospace | OYOG | Quote | News |