| Symbol | Name of Company |
| OILCOUNTUB | Oil Country Tubular Ltd |
| ONGC | Oil And Natural Gas Corp. |
| ONWARDTEC | Onward Technologies Ltd |
| ORCHIDPHAR | ORCHID PHARMA LIMITED |
| ORIENTBANK | Oriental Bank Of Commerce |
| ORIENTHOT | Orient Hotels Ltd |
| ORIENTPPR | Orient Paper And Inds Ltd |
| OCL | Ocl India Ltd |
| OUDHSUG | The Oudh Sugar Mills Ltd |
| OMAXAUTO | Omax Autos Ltd |
| OPTOCIRCUI | Opto Circuits (I) Ltd. |
| ORIENTBELL | Orient Bell Limited |
| OIL | Oil India Ltd |
| ORIENTLTD | Orient Press Limited |
| OLECTRA | OLECTRA GREENTECH LIMITED |
| OFSS | Oracle Fin Serv Soft Ltd. |
| OBEROIRLTY | Oberoi Realty Limited |
| ORIENTABRA | Orient Abrasive Ltd |
| OISL | Ocl Iron And Steel Ltd |
| ORIENTALTL | Oriental Trimex Ltd |
| ORBITCORP | Orbit Corp. Ltd. |
| OMAXE | Omaxe Limited |
| OMNITECH | Omnitech Infosolu Ltd. |
| ONMOBILE | Onmobile Global Ltd. |
| OMKARCHEM | Omkar Spl Chem Ltd |
| ORISSAMINE | Orissa Min Dev Co Ltd |
| OMMETALS | Om Metals Infrapro Ltd |
| ONELIFECAP | Onelife Cap Advisors Ltd |
| OPTIEMUS | OPTIEMUS INFRACOM LTD |
| ORIENTELEC | ORIENT ELECTRIC LIMITED |
| OCLINDIA | ODISHA CEMENT LIMITED |
| ONEPOINT | ONE POINT ONE SOL LTD |
| OAL | ORIENTAL AROMATICS LTD |
| ORIENTCEM | Orient Cement Ltd. |
| ORIENTREF | Orient Refractories Ltd |
| ORBTEXP | Orbit Exports Limited |
| ORTEL | ORTEL COMMUNICATIONS LTD |
| ORICONENT | ORICON ENTERPRISES LTD |
| ORTINLABSS | ORTIN LABORATORIES LTD |
| OCCL | ORIENTAL CARBN & CHEM LTD |