| OTTO Capital LIMITED | Private company limited by shares | Live |
| OTTO DRAGON LIMITED | Private company limited by shares | Dissolved |
| OTTO ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| OTTO ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OTTO GRAND LIMITED | Private company limited by shares | Dissolved |
| OTTO INTERACTIVE LIMITED | Private company limited by shares | Live |
| OTTO SENSE LIMITED | Private company limited by shares | Dissolved |
| Otto2 H.K. Co., Limited | Private company limited by shares | Live |
| OTTOBURY LIMITED | Private company limited by shares | Dissolved |
| Ottocento Limited | Private company limited by shares | Live |
| Ottocento Cinquantadue Milano Limited | | Live |
| OTTOCOLOR LIMITED | Private company limited by shares | Live |
| OTTOENERGY LIMITED | | Live |
| OTTOFIELD COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTTOGEN LIMITED | Private company limited by shares | Live |
| Ottogo Inc Limited | | Live |
| OTTOHILL LIMITED | Private company limited by shares | Live |
| OTTO-JEPY MARKETING (H.K.) LIMITED | Private company limited by shares | Dissolved |
| OTTOLINA HK LIMITED | Private company limited by shares | Live |
| Ottolina Coffee HK Limited | Private company limited by shares | Dissolved |
| OTTOMAN LIMITED | Private company limited by shares | Dissolved |
| OTTOMAN LIMITED | Private company limited by shares | Live |
| Ottoman Evershine Construction Limited | Private company limited by shares | Live |
| Ottoman Evershine Enterprise Company Limited | Private company limited by shares | Live |
| Ottoman Evershine Finance Limited | Private company limited by shares | Live |
| OTTOMAN IMPORT & EXPORT COMPANY LIMITED | Private company limited by shares | Live |
| OTTOMAN INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| Ottoman Evershine Asset Management Limited | Private company limited by shares | Live |
| 1453 OTTOMAN MEDITERRANEAN LIMITED | Private company limited by shares | Live |
| OTTOMAN MEDITERRANEAN CUISINE LIMITED | Private company limited by shares | Live |
| Ottoman Mediterranean Resorts Cusine Limited | Private company limited by shares | Live |
| OTTOMAN VENTURE COMPANY LIMITED | Private company limited by shares | Live |
| OTTOMOB LIMITED | Private company limited by shares | Live |
| OTTOMOBILE LIMITED | Private company limited by shares | Live |
| OTTON ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| OTTONA LIMITED | Private company limited by shares | Live |
| OTTONIAN VACATION LIMITED | Private company limited by shares | Live |
| OTTOPOST LIMITED | Private company limited by shares | Dissolved |
| OTTOPRO LIMITED | Private company limited by shares | Live |
| GERMANY OTTOR (HONG KONG) GROUP COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTTOR Tech HK Co., Limited | | Live |
| OTTOROSSO LIMITED | Private company limited by shares | Dissolved |
| OTTO'S FOOD SERVICES CO., LIMITED | Private company limited by shares | Live |
| OTTOSTAR LIMITED | Private company limited by shares | Dissolved |
| OTTOWAY COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTTOWAY LIMITED | Private company limited by shares | Live |
| OTTOWELL LIMITED | Private company limited by shares | Dissolved |
| OTTOWIS LIMITED | Private company limited by shares | Dissolved |
| OTTOWISE LIMITED | Private company limited by shares | Dissolved |
| OTTQUE INT'L CO., LIMITED | | Live |
| OT&TRADE LIMITED | Private company limited by shares | Live |
| OTTRINGHAM LIMITED | Private company limited by shares | Live |
| OTTSMART LIMITED | Private company limited by shares | Live |
| Otty International Development Co., Limited | | Live |
| OTUIA Limited | Private company limited by shares | Live |
| OTUS LIMITED | Private company limited by shares | Live |
| Otway Oil and Gas Limited | Private company limited by shares | Live |
| Otway Petroleum Limited | Private company limited by shares | Live |
| OTWAY TRADING LIMITED | Private company limited by shares | Dissolved |
| OTWAYS LIMITED | Private company limited by shares | Dissolved |
| HK OTZEE.DUCK INTERNATIONAL LIMITED | | Live |