| Eroi Otoona Limited | Private company limited by shares | Dissolved |
| OTOP ELECTRONIC CO., LIMITED | Private company limited by shares | Live |
| HONG KONG OTOP LIGHTING CO., LIMITED | Private company limited by shares | Live |
| OTOP (JIYUXING) OPTOELECTRONIC CO., LIMITED | Private company limited by shares | Live |
| OTOP LED LIGHTING CO., LIMITED | Private company limited by shares | Live |
| OTOP TECH CO., LIMITED | Private company limited by shares | Live |
| SHENZHEN OTOP TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| OTOP TECHNOLOGY (HK) LIMITED | Private company limited by shares | Live |
| SHENZHEN OTOP TECHNOLOGY (HK) LIMITED | Private company limited by shares | Live |
| OTOP ELECTRICAL MANUFACTURE CO., LIMITED | Private company limited by shares | Live |
| Germany Otop Power Technology Limited | Private company limited by shares | Live |
| Otopa Trading Company Limited | | Live |
| Otopac Limited | Private company limited by shares | Live |
| GERMANY OTOPTEH PETROLEUM HOLDINGS LIMITED | Private company limited by shares | Live |
| Otoro Biotherapeutics (HK) Limited | Private company limited by shares | Live |
| Otoro Hong Kong Limited | | Live |
| Otoro Imaging Limited | | Live |
| Otoro Radiology Limited | Private company limited by shares | Live |
| OTOS COMPANY LIMITED | Private company limited by shares | Live |
| OTRAC LIMITED | Private company limited by shares | Live |
| OTRAC INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OTRAM LIMITED | Private company limited by shares | Dissolved |
| OTRAMAN (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| Otranto Limited | | Live |
| OTRAPUS LIMITED | Private company limited by shares | Live |
| oTree Limited | Private company limited by shares | Live |
| OTRHK LIMITED | Private company limited by shares | Live |
| Otrifowd Co., Limited | | Live |
| OTRIH NATYS RD LIMITED | | Live |
| Hong Kong Otro-Mismo Trade Limited | | Live |
| OTRON LIMITED | Private company limited by shares | Dissolved |
| Otron Company Limited | Private company limited by shares | Live |
| OTRS Limited | Private company limited by shares | Live |
| OTRS Asia Limited | Private company limited by shares | Live |
| France Otrys (International Holding) Co., Limited | Private company limited by shares | Live |
| O.T.S. INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| O.T.S. MUSIC LIMITED | Private company limited by shares | Dissolved |
| OTSEGO LIMITED | Private company limited by shares | Dissolved |
| Otsego Company Limited | | Live |
| OTSLOAH COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTSO C LIMITED | | Live |
| OT-STARTEK LIMITED | Private company limited by shares | Live |
| OTSTONE LIMITED | Private company limited by shares | Live |
| OTSUKA CO., LIMITED | Private company limited by shares | Live |
| OTSUMO LIMITED | | Live |
| OTTA LIMITED | Private company limited by shares | Dissolved |
| OTTA TECHNOLOGY (HONG KONG) LIMITED | Private company limited by shares | Live |
| OTTACA INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OTTALAND COMPANY LIMITED | Private company limited by shares | Dissolved |
| Jiangmen Ottanta Otto Faucet Co., Limited | Private company limited by shares | Live |
| Ottanta Hardware (HK) Limited | Private company limited by shares | Live |
| OTTANTA OTTO LIMITED | Private company limited by shares | Live |
| OTTAR INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| OTTAWA FUR COMPANY LIMITED | Private company limited by shares | Live |
| OTTAWA COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTTAX LIMITED | Private company limited by shares | Live |
| OTTECH LIMITED | Private company limited by shares | Dissolved |
| OTTER LIMITED | Private company limited by shares | Live |
| OTTER OS LIMITED | | Live |
| OtterAI Co., Limited | Private company limited by shares | Live |
| OTTERBOURNE INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OtterBox Hong Kong Limited | Private company limited by shares | Live |
| OTTERDEN COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTTEREX LIMITED | Private company limited by shares | Live |
| OTTERFIELD COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTTERHALL COMPANY LIMITED | Private company limited by shares | Dissolved |
| OTTERHAM LIMITED | Private company limited by shares | Dissolved |
| OTTERLANE COMPANY LIMITED | Private company limited by shares | Dissolved |
| Grantham Mayo Van Otterloo Asset Management Limited | | Live |
| OTTERROCK LIMITED | Private company limited by shares | Dissolved |
| Otter's Adventure Limited | | Live |
| OTTERSHAW COMPANY LIMITED | Private company limited by shares | Live |
| OTTERSLUNCH LIMITED | Private company limited by shares | Live |
| OTTERSPOOL ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OTTERSWICK LIMITED | Private company limited by shares | Dissolved |
| OTTERSWICK LIMITED | Private company limited by shares | Dissolved |
| Otterty Limited | Private company limited by shares | Live |
| OTTEWELL TRADING LIMITED | Private company limited by shares | Dissolved |
| OTTI DEVELOPMENT LIMITED | Private company limited by shares | Live |
| OTTI INTERIOR CONTRACTING LIMITED | Private company limited by shares | Live |
| OTTICA ASIA LIMITED | Private company limited by shares | Dissolved |
| OTTICA (CHINA) LIMITED | Private company limited by shares | Dissolved |
| OTTICA FAR EAST LIMITED | Private company limited by shares | Dissolved |
| Ottica (Hong Kong) Limited | Private company limited by shares | Live |
| OTTIGEN LIMITED | Private company limited by shares | Live |
| OTTIGO (HK) Limited | Private company limited by shares | Live |
| OTTIGO International Limited | Private company limited by shares | Live |
| OTTIMO COMPANY LIMITED | Private company limited by shares | Live |
| OTTIMO CASA LIMITED | Private company limited by shares | Live |
| Ottimo Consulting Limited | Private company limited by shares | Live |
| Ottimo Energy Limited | Private company limited by shares | Live |
| OTTIMO GROUP LIMITED | Private company limited by shares | Live |
| Ottimo Management Company Limited | Private company limited by shares | Dissolved |
| OTTIMOMO LIMITED | Private company limited by shares | Live |
| OTTLEY INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OTTO G. S. LIMITED | Private company limited by shares | Dissolved |
| OTTO LIMITED | Private company limited by shares | Dissolved |
| OTTO LIMITED | Private company limited by shares | Live |
| OTTO INC LIMITED | Private company limited by shares | Live |
| OTTO LIMITED | Private company limited by shares | Live |