| OPAL MINE LIMITED | Private company limited by shares | Live |
| Opal Moon Limited | Private company limited by shares | Live |
| OPAL NOVA LIMITED | Private company limited by shares | Live |
| Ocean Opal Limited | | Live |
| PACIFIC OPAL LIMITED | Private company limited by shares | Live |
| OPAL PAGING COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPAL PARTS MANUFACTURING COMPANY LIMITED | Private company limited by shares | Live |
| OPAL PRINTING LIMITED | Private company limited by shares | Live |
| Opal Property Limited | Private company limited by shares | Live |
| OPAL QUARTZ LIMITED | Private company limited by shares | Live |
| OPAL RESOURCES LIMITED | Private company limited by shares | Live |
| OPAL RIDGE LIMITED | Private company limited by shares | Live |
| OPAL RING LIMITED | Private company limited by shares | Live |
| XIN HAI OPAL SHIPPING LIMITED | Private company limited by shares | Live |
| Eastern Opal Shipping Limited | Private company limited by shares | Live |
| OPAL STAR LIMITED | Private company limited by shares | Dissolved |
| Star Opal Limited | Private company limited by shares | Live |
| OPAL STAR LIMITED | Private company limited by shares | Live |
| OPAL STAR LIMITED | Private company limited by shares | Live |
| OPAL STAR INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OPAL STAR JEWELLERY LIMITED | Private company limited by shares | Dissolved |
| OPAL STONE LIMITED | Private company limited by shares | Live |
| OPAL SYMBOL LIMITED | Private company limited by shares | Dissolved |
| OPAL TARGET INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SUN OPAL TRADING LIMITED | Private company limited by shares | Dissolved |
| OPAL TRADING COMPANY LIMITED | Private company limited by shares | Live |
| Opal Trading Hong Kong Limited | Private company limited by shares | Live |
| OPAL WATCH MFG LIMITED | Private company limited by shares | Dissolved |
| Western Opal Holding Limited | Private company limited by shares | Live |
| WING PO OPAL TARGET COMPANY LIMITED | Private company limited by shares | Dissolved |
| WINNER OPAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPALART LIMITED | Private company limited by shares | Dissolved |
| OPALART AND CRAFT CENTRE LIMITED | Private company limited by shares | Live |
| Opalatic Systems and Trading Limited | Private company limited by shares | Live |
| OPALBOND COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPALBRIGHT INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OPALCORP (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| OPALE LAPIDARY LIMITED | Private company limited by shares | Dissolved |
| OPALE METALS AND TRADING COMPANY LIMITED | Private company limited by shares | Live |
| OPALFLAKE LIMITED | Private company limited by shares | Dissolved |
| OPALFONT LIMITED | Private company limited by shares | Dissolved |
| OPALHILL LIMITED | Private company limited by shares | Dissolved |
| OPALI LIMITED | Private company limited by shares | Dissolved |
| Opali Limited | Private company limited by shares | Live |
| OPALIA DB LIMITED | Private company limited by shares | Live |
| OPALMAN LIMITED | Private company limited by shares | Live |
| OPALMARK INVESTMENTS COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPALMARK MANUFACTORY LIMITED | Private company limited by shares | Dissolved |
| OPALMIND ANTI-AGING COSMETOLOGY RESEARCH LIMITED | Private company limited by shares | Live |
| Opalnology Limited | Private company limited by shares | Live |
| OPALOAK LIMITED | Private company limited by shares | Live |
| OPALRING LIMITED | Private company limited by shares | Dissolved |
| OPALS MINE FACTORY LIMITED | Private company limited by shares | Live |
| Emil Weis Opals HK Limited | Private company limited by shares | Live |
| OPALSOURCES COMPANY LIMITED | Private company limited by shares | Live |
| OPALSTRALIA JEWELLERY LIMITED | Private company limited by shares | Dissolved |
| OPALUS LIMITED | Private company limited by shares | Live |
| Opalus Electronics Limited | | Live |
| OPALUS OPTO-ELECTRONICS (HK) CO., LIMITED | Private company limited by shares | Live |
| Opalus Industrial Co., Limited | Private company limited by shares | Live |
| China Opalus Integrate Industrial Co., Limited | Private company limited by shares | Live |
| OPALUS INTERNATIONAL LIMITED | Private company limited by shares | Live |
| FOSHAN OPALUS STONE LIMITED | Private company limited by shares | Live |
| OPALVILLE LIMITED | Private company limited by shares | Dissolved |
| OPALVISION LIMITED | Private company limited by shares | Dissolved |
| OPALVISION CENTRE ONE LIMITED | Private company limited by shares | Dissolved |
| Opalwave Technologies Limited | | Live |
| OPANI INTERNATIONAL TRADING LIMITED | Private company limited by shares | Dissolved |
| OPAQUE COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPAROA LIMITED | Private company limited by shares | Live |
| O-Part Technology Limited | Private company limited by shares | Live |
| O.Partnership Limited | Private company limited by shares | Live |
| OPATOW ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OPAWICA LIMITED | Private company limited by shares | Dissolved |
| OPAYE INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| OPBAILEY LIMITED | Private company limited by shares | Live |
| Ali Oli (OPC) Limited | Private company limited by shares | Live |
| ANG Lifesciences (OPC) Pvt. Limited | Private company limited by shares | Live |
| OPCA Limited | Private company limited by shares | Live |
| OPCO LIMITED | Private company limited by shares | Dissolved |
| COB OpCo Limited | | Live |
| OPCOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPCOMM LIMITED | | Live |
| OPCON LIMITED | Private company limited by shares | Dissolved |
| Opconsult Limited | Private company limited by shares | Live |
| OPCSUN TECHNOLOGY (HK) CO., LIMITED | Private company limited by shares | Live |
| OPCX Engineering Limited | | Live |
| OPDA APPUBLISH Co. Limited | Private company limited by shares | Live |
| OPdigital Limited | Private company limited by shares | Live |
| OPDISO LIMITED | Private company limited by shares | Live |
| OPDO CHINA LIMITED | Private company limited by shares | Live |
| OPEAK LIMITED | Private company limited by shares | Dissolved |
| OPEC ELECTRONICS HONG KONG LIMITED | Private company limited by shares | Dissolved |
| OPEC ENERGY HONGKONG LIMITED | Private company limited by shares | Live Commenced dormancy on 10-May-2016 |
| OPEC ENGINEERING LIMITED | Private company limited by shares | Live |
| OPEC HOLDING GROUP LIMITED | Private company limited by shares | Live |
| OPEC (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| OPEC TRADING LIMITED | Private company limited by shares | Live |
| OPEC INTERNATIONAL TRADING COMPANY LIMITED | Private company limited by shares | Live |
| OPECO LIMITED | Private company limited by shares | Dissolved |