| OpenRead Pte Ltd | Singapore |
| Openspace Capital Pte Ltd | |
| Openspace Ventures | Singapore |
| Openwave Singapore | |
| OpenXML.biz | Singapore |
| Opontia Pte Ltd | |
| Optimum Solutions | Singapore |
| Optty Pte Ltd | Singapore |
| Opus IT Services Pte Ltd | Singapore |
| Orfeostory Pte Ltd | |
| Orgnix Creatives Pte Ltd | Singapore |
| Oriental Motor Asia Pacific Pte Ltd | |
| Oriented Games Pte Ltd | Singapore |
| Origgin Pte Ltd | Singapore |
| Oryon Networks Pte Ltd | Singapore |
| Osome Pte Ltd | |
| Our Little Company Pte Ltd | |
| OUS Group Pte Ltd | Singapore |
| Overtake Labs Pte Ltd | |
| OVOC | Singapore |
| OxPay Financial Ltd | Singapore |
| Oyika | |
| Pacific Internet | Singapore |
| Pacific Tech Pte Ltd | Singapore |
| PairX Bio Pte Ltd | |
| Paktor Pte Ltd | |
| Palazon Technology Pte Ltd | Singapore |
| Palvision | Singapore |
| Panasonic Singapore | Singapore |
| Pand.ai Pte Ltd | Singapore |
| Pantropic Online Pte Ltd | Singapore |
| Paperpal | |
| Paprika Global | Singapore |
| ParallelChain | Singapore |
| Parcel Perform Pte Ltd | Singapore |
| Parisilk Electronics & Computers Pte Ltd | Singapore |
| Parkway Laboratories | Singapore |
| Parseur | Singapore |
| Particle Network | Singapore |
| Partior | |
| Partipost | Singapore |
| PASR Technologies Pte Ltd | Singapore |
| Pathnova | |
| Patsnap | Singapore |
| PayrollHero Pte Ltd | Singapore |
| Paywatch Global Pte Ltd | Singapore |
| PC Dreams | Singapore |
| PC S.O.S. | Singapore |
| PC Show | Singapore |
| PCA Technology Ltd | Singapore |