| One9 Tech | |
| OneAssist Consumer Solutions Pvt Ltd | |
| OneBanc | Haryana |
| OneBiz Marketing Solutions | |
| OneCard | Maharashtra |
| OneCause | |
| OneCell Diagnostics Pvt Ltd | |
| OneCity | |
| OneClick IT Consultancy Pvt Ltd | Gujarat |
| OneData Software Solutions Pvt Ltd | |
| Onedegreecowork | |
| OneDigitalAD | Karnataka |
| OneDigitalTech.in | Tamil Nadu |
| OneEighty Aamoksh Technologies Pvt Ltd | |
| Oneggy Technologies OPC Pvt Ltd | |
| Onelab Ventures Pvt Ltd | |
| OneLeap Solutions Pvt Ltd | Maharashtra |
| OneOrchids Techsolutions Pvt Ltd | |
| Onepixel Soft Pvt Ltd | |
| ONergy Solar (Punam Energy Pvt Ltd) | |
| OneScore | |
| OneSource | |
| Onestep Grow Pvt Ltd | |
| OneStrategy Digital | |
| onething.design | |
| Oneture Technologies Pvt Ltd | Maharashtra |
| OneWorldTechnologies | Haryana |
| OnGrid | Haryana |
| Onistech Info Systems | |
| Online Biz Solutions | |
| Online Consultancy Services | Tamil Nadu |
| Online Front | |
| Online Growth Hub | |
| Online Guards | Telangana |
| Online Home Services | Maharashtra |
| Online Interview Questions | Delhi |
| Online Media Space | Kerala |
| Online Promotion House | |
| OnlineCaptain | |
| Onlineitguru.com | Telangana |
| OnlineSathi.in | |
| Onlygood | |
| OnlyWeb.in | Gujarat |
| OnMobile Global Ltd | Karnataka |
| onPoint Software Services | |
| Onset Technologies | Punjab |
| Onsurity Technologies Pvt Ltd | |
| Onters | Madhya Pradesh |
| OnTra Tech | Maharashtra |
| OnTrac | Karnataka |