| Ortin Laboratories Ltd (ORTINLAABS) BSE - Bombay Stock Exchange | |
| OSEASPRE CONSULTANTS LTD. (OSEASPR) BSE - Bombay Stock Exchange | |
| OSIAN INDUSTRIES LTD. (OSIAIND) BSE - Bombay Stock Exchange | |
| OTCO INTERNATIONAL LTD. (OTCO) BSE - Bombay Stock Exchange | |
| OTOKLIN PLANTS & EQUIPMENTS LT (OTOKLIN) BSE - Bombay Stock Exchange | |
| Ovobel Foods Ltd (OVOBELE) BSE - Bombay Stock Exchange | |
| OXEMBERG APPARELS LTD. (OXEM BAP) BSE - Bombay Stock Exchange | |
| OXIDES & SPECIALITIES LTD. (523389) BSE - Bombay Stock Exchange | |
| Octal Credit Capital Ltd. (OCTAL) BSE - Bombay Stock Exchange | |
| Origin Agrostar Ltd (DSQBIO) BSE - Bombay Stock Exchange | |
| Oswal Greentech Ltd (BINDALAGRO) BSE - Bombay Stock Exchange | |
| Oyeeee Media Ltd (OYEEEE) BSE - Bombay Stock Exchange | |
| Ozone World Limited (539291) BSE - Bombay Stock Exchange | |
| Ortin Laboratories Ltd (ORTINLABSS) NSE - National Stock Exchange of India | |
| Ortel Communications Ltd (ORTEL) NSE - National Stock Exchange of India | |