| OPAC LIMITED | Private company limited by shares | Dissolved |
| OPAC LIMITED | Private company limited by shares | Live |
| OPACITY LIMITED | Private company limited by shares | Dissolved |
| OPACITY ARCHITECTS LIMITED | Private company limited by shares | Live |
| OPACO CO., LIMITED | Private company limited by shares | Dissolved |
| OPAF LIMITED | Private company limited by shares | Live |
| HONGKONG OPAID INTERNATIONAL HOUSEWARES LIMITED | Private company limited by shares | Live |
| HONGKONG OPAID INTERNATIONAL LIGHTING LIMITED | Private company limited by shares | Live |
| Opaige Co., Limited | Private company limited by shares | Live |
| Opaige Trading Limited | | Live |
| OPAIL ELECTRIC (CHINA) LIMITED | Private company limited by shares | Live |
| OPAIL KITCHEN ELECTRIC (CHINA) LIMITED | Private company limited by shares | Live |
| Opaita CO., Limited | | Live |
| OPAK CELLER LIMITED | Private company limited by shares | Live |
| OPAL COMPANY LIMITED | Private company limited by shares | Live |
| SUN OPAL LIMITED | Private company limited by shares | Live |
| TOP OPAL LIMITED | Private company limited by shares | Live |
| A OPAL LIMITED | Private company limited by shares | Live |
| OPAL INC LIMITED | Private company limited by shares | Live |
| OPAL ADVERTISING COMPANY LIMITED | Private company limited by shares | Live |
| ALLIED OPAL LIMITED | | Live |
| Allied Opal Investment Limited | | Live |
| OPAL Appraisals Limited | Private company limited by shares | Live |
| OPAL ASIA LIMITED | Private company limited by shares | Live |
| OPAL CAPITAL PTY LIMITED | Private company limited by shares | Live |
| TAT WAH OPAL CENTRE LIMITED | Private company limited by shares | Dissolved |
| CENTURY OPAL LIMITED | Private company limited by shares | Live |
| OPAL CENTURY LIMITED | | Live |
| CHENG'S OPAL FACTORY LIMITED | Private company limited by shares | Dissolved |
| Opal Footwear Co., Limited | Private company limited by shares | Live |
| XINYI OPAL JEWELRY CO., LIMITED | Private company limited by shares | Live |
| OPAL SHIPPING CO., LIMITED | | Live |
| OPAL JEWELRY COLLECTIONS LIMITED | Private company limited by shares | Dissolved |
| OPAL CONSTRUCTION & ENGINEERING LIMITED | Private company limited by shares | Live |
| OPULENT OPAL CONSTRUCTION LIMITED | | Live |
| Opal Consulting Limited | Private company limited by shares | Live |
| OPAL SCM Consulting Limited | | Live |
| OPAL CREATIONS LIMITED | Private company limited by shares | Live |
| ARTISTIC OPAL CREATIONS LIMITED | Private company limited by shares | Dissolved |
| OPAL CROWN LIMITED | Private company limited by shares | Live |
| CROWN OPAL INVESTMENT LIMITED | Private company limited by shares | Live |
| OPAL DECOR LIMITED | Private company limited by shares | Dissolved |
| GEM OPAL DISTRIBUTORS (1981) LIMITED | Private company limited by shares | Dissolved |
| DRAGON OPAL LIMITED | | Live |
| Opal Far East Limited | | Live |
| OPAL EAST TRADING LIMITED | Private company limited by shares | Live |
| OPAL EMPIRE LIMITED | Private company limited by shares | Dissolved |
| Opal Energy Limited | | Live |
| SUN OPAL ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Opal Enterprises Limited | Private company limited by shares | Dissolved |
| OPAL DRAGON ENTERPRISES LIMITED | Private company limited by shares | Live |
| OPAL FACTORY LIMITED | Private company limited by shares | Dissolved |
| FAIR OPAL LIMITED | Private company limited by shares | Live |
| FIRST OPAL LIMITED | Private company limited by shares | Live |
| OPAL GALLERY LIMITED | Private company limited by shares | Dissolved |
| Laind Opal Houseware (Germany) Limited | Private company limited by shares | Live |
| Opal Global Limited | | Live |
| GLORY OPAL LIMITED | Private company limited by shares | Live |
| GOLD OPAL LIMITED | Private company limited by shares | Live |
| GOLD OPAL ENTERPRISES LIMITED | Private company limited by shares | Live |
| OPAL GOLDIES LIMITED | Private company limited by shares | Live |
| Opal Group Limited | Private company limited by shares | Live |
| Opal Cosmetics Group Limited | Private company limited by shares | Live |
| OPAL REALTY GROUP LIMITED | Private company limited by shares | Live |
| OPAL GUILD LIMITED | Private company limited by shares | Live |
| OPAL HARBOUR LIMITED | | Live |
| OPAL HEALTH AUSTRALIAN COMPANY LIMITED | Private company limited by shares | Live |
| OPAL HEALTH HONG KONG LIMITED | | Live |
| WING HING OPAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPAL ASSOCIATION OF HONG KONG LIMITED | Private company limited by shares | Dissolved |
| OPAL (HONG KONG) LIMITED | Private company limited by shares | Live |
| OPAL INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| OPAL INDUSTRIAL LIMITED | Private company limited by shares | Live |
| OPAL INDUSTRIAL (CHINA) LIMITED | Private company limited by shares | Live |
| OPAL INDUSTRIAL (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| OPAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| TOP OPAL INVESTMENT LIMITED | Private company limited by shares | Live |
| OPAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| GOLD OPAL INVESTMENT LIMITED | Private company limited by shares | Live |
| GRAND OPAL INVESTMENT LIMITED | Private company limited by shares | Live |
| Opal Watches and Jewellery Limited | Private company limited by shares | Live |
| MY JEWELRY (OPAL) LIMITED | Private company limited by shares | Dissolved |
| KEEP OPAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| OPAL COSMETICS (HONG KONG) LIMITED | Private company limited by shares | Live |
| OPAL INTELLIGENT SOLUTIONS (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| SMITH & GRANT (OPAL) HONG KONG LIMITED | Private company limited by shares | Dissolved |
| OPAL LAND LIMITED | Private company limited by shares | Live |
| OPAL LEAVES COMPANY LIMITED | Private company limited by shares | Dissolved |
| LEGEND OPAL LIMITED | Private company limited by shares | Live |
| OPAL LONDON (ASIA) LIMITED | Private company limited by shares | Live |
| LONGZHOU OPAL (HONG KONG) LIMITED | Private company limited by shares | Live |
| OPAL LUCKY LIMITED | Private company limited by shares | Live |
| OPAL MANAGEMENT LIMITED | Private company limited by shares | Live |
| OPAL MANUFACTURING COMPANY LIMITED | Private company limited by shares | Live |
| HEADWAY OPAL MANUFACTURING LIMITED | Private company limited by shares | Dissolved |
| OPAL JEWELRY MANUFACTURING LIMITED | Private company limited by shares | Dissolved |
| MAPLE OPAL MARITIME LIMITED | Private company limited by shares | Live |
| NEO MATRIX OPAL LIMITED | Private company limited by shares | Dissolved |
| MILLION OPAL LIMITED | | Live |
| OPAL MINE LIMITED | Private company limited by shares | Live |