• Oberoi Realty Limited

• OCL India Limited

• OCL Iron and Steel Limited

• Oil & Natural Gas Corporation Limited

• Oil Country Tubular Limited

• Oil India

• Oil India Limited

• OM Metals Infraprojects Limited

• Omax Autos Limited

• Omaxe Limited

• Omkar Speciality Chemicals Limited

• Onelife Capital Advisors Limited

• ONGC

• OnMobile Global Limited

• Onward Technologies Limited

• Opto Circuits (India) Limited

• Oracle Fin Serv

• Oracle Financial Services Software Limited

• Orbit Exports Limited

• Orchid Pharma Limited

• Oricon Enterprises Limited

• Orient Abrasives Limited

• Orient Bell Limited

• Orient Cement Limited

• Orient Green Power Company Limited

• Orient Paper & Industries Limited

• Orient Press Limited

• Orient Refractories Limited

• Oriental Bank of Commerce

• Oriental Carbon & Chemicals Limited

• Oriental Hotels Limited

• Oriental Trimex Limited

• Ortel Communications Limited

• Ortin Laboratories Limited

• Oswal Chemicals & Fertilizers Limited

• The Orissa Minerals Development Company Limited