| Oxford Industries Inc (OXM) NYSE - The New York Stock Exchange | |
| Olympia Industries Ltd (OLYMPTX) BSE - Bombay Stock Exchange | |
| Orient Refractories Ltd (ORIENTREF) BSE - Bombay Stock Exchange | |
| Oceanaa Biotek Industries Ltd (OBIL) BSE - Bombay Stock Exchange | |
| OKAMOTO INDUSTRIES, INC. (5122) TYO - Tokyo Stock Exchange | |
| OPKO HEALTH INC. DL-,01 (XCY) FRA - Deutsche Börse Frankfurt Stock Exchange | |
| Oando plc (OAO) JSE - Johannesburg Stock Exchange | |
| Orange SA (ORA) EPA - Paris NYSE Euronext | |
| Orion Oyj (ORNAV) HEL - Helsinki NASDAQ OMX | |
| Orocobre Limited (ORE) ASX - Australian Securities Exchange | |
| Outotec Oyj (OTE1V) HEL - Helsinki NASDAQ OMX | |
| OncoCyte Corp (OCX) NYSEMKT - NYSE MKT LLC | |
| Oragenics Inc (OGEN) NYSEMKT - NYSE MKT LLC | |
| Orchids Paper Products Co (TIS) NYSEMKT - NYSE MKT LLC | |
| Orient Paper Inc (ONP) NYSEMKT - NYSE MKT LLC | |