| Ontrack Technologies Pvt Ltd | |
| Ontreat Service Pvt Ltd | |
| Onviqa Pvt Ltd | |
| OoBI Media solutions Pvt Ltd | Haryana |
| Oodles Studio | Haryana |
| Oodles Technologies Pvt Ltd | |
| Oodles Technologies Pvt Ltd | |
| OodlesTechnologies Pvt Ltd | Haryana |
| Oodu Implementers Pvt Ltd | Tamil Nadu |
| Oolka | |
| Oops Labs Pvt Ltd | Karnataka |
| OORJAA | Maharashtra |
| Ooze IT Solutions Pvt Ltd | |
| OOZEE Technologies | |
| Opal Infotech | |
| Open Designs In | Tamil Nadu |
| Open Financial Technologies Pvt Ltd | Karnataka |
| Open Mind Services Ltd | Haryana |
| OpenDG Pvt Ltd | |
| OpenSecurity | Karnataka |
| Openspace Services Pvt Ltd | Maharashtra |
| Openteq | |
| Openturf | |
| Openweb Solutions | |
| OpenXcode | Gujarat |
| Operon Biotech | |
| OpExWorks Solutions Pvt Ltd | Maharashtra |
| Opine | |
| OPJS University | |
| Oprezo India | |
| Opris Tech Pvt Ltd | |
| OpsEazy | |
| Opstech Solution Pvt Ltd | |
| Opti Matrix | |
| Optiedge Tech Solutions, LLP | |
| Optimiser | |
| Optimist Brand Design, LLP | Maharashtra |
| Optimist Brand Design, LLP | |
| Optimistik Infosystems | Maharashtra |
| Optimized Infotech | |
| Optimized Solutions Ltd | Gujarat |
| Optimum Data Analytics | Maharashtra |
| Optimum Financial Solutions Pvt Ltd | Maharashtra |
| Optimum Technical Labs, LLP | |
| OptimumBrew Technology Pvt Ltd | Gujarat |
| Optywise | |
| Opula Software Development Pvt Ltd | |
| Opulence Infotech Pvt Ltd | |
| Opulentus Overseas Careers Pvt Ltd | |
| Opusify IT Solutions Pvt Ltd | |