| OCEANIKA RESOURCES LIMITED | Private company limited by shares | Live |
| OCEANINA FOODSTUFF CO., LIMITED | Private company limited by shares | Live |
| OCEAN-INN COMPANY LIMITED | Private company limited by shares | Dissolved |
| Oceanion International Company Limited | Private company limited by shares | Live |
| OCEANIS LIMITED | Private company limited by shares | Live |
| Oceanix Limited | Private company limited by shares | Live |
| Oceanix Limited | Private company limited by shares | Live |
| OCEANIZED LIMITED | Private company limited by shares | Live |
| OCEAN-J Industrial Limited | Private company limited by shares | Live |
| Ocean-J Trading Limited | Private company limited by shares | Live |
| OCEANJOY TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| OCEAN-JOY SHIPPING COMPANY LIMITED | Private company limited by shares | Live |
| OCEANKIDS (HONG KONG) TRADING LIMITED | Private company limited by shares | Live |
| OCEANKING SOLAR CO., LIMITED | Private company limited by shares | Dissolved |
| OCEANKIT LIMITED | Private company limited by shares | Dissolved |
| OCEANLAKE LIMITED | Private company limited by shares | Dissolved |
| OCEANLAND LIMITED | Private company limited by shares | Live |
| OCEANLAND ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OCEANLAND TRANSPORT HK LIMITED | Private company limited by shares | Live |
| OCEAN-LAND WAREHOUSING LIMITED | Private company limited by shares | Dissolved |
| OCEANLEAD LIMITED | Private company limited by shares | Dissolved |
| OCEANLEAP CLOUD SERVICE LIMITED | Private company limited by shares | Live |
| OCEANLINE INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OCEANLINK LIMITED | Private company limited by shares | Live |
| OCEANLINK CONSOLIDATION SERVICE (CHINA) LIMITED | Private company limited by shares | Dissolved |
| Oceanlink Shipping Trade Co., Limited | Private company limited by shares | Live |
| Oceanlink Group Limited | | Live |
| OCEANLINK HOLDING LIMITED | Private company limited by shares | Dissolved |
| OCEANLINK INTERTRANS LIMITED | Private company limited by shares | Dissolved |
| OCEANLINK INVESTMENT LIMITED | Private company limited by shares | Live |
| OCEAN-LINK INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OCEANLINK MARINE LIMITED | Private company limited by shares | Live |
| OCEANLINK MARITIME LIMITED | Private company limited by shares | Live |
| NEWTEC OCEANLINK LIMITED | Private company limited by shares | Dissolved |
| OCEANLINK RESOURCES LIMITED | Private company limited by shares | Dissolved |
| OCEANLINK SHIPPING LIMITED | Private company limited by shares | Dissolved |
| Ocean-Link Trading Limited | Private company limited by shares | Live |
| HONG KONG OCEANLION SHIPPING CO., LIMITED | Private company limited by shares | Live |
| OCEANLION INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Oceanlite Limited | Private company limited by shares | Live |
| OCEAN-LOG INVESTMENTS LDA LIMITED | | Live |
| OCEANLUCK LIMITED | Private company limited by shares | Dissolved |
| OCEANLY LIMITED | Private company limited by shares | Dissolved |
| OCEANLY INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| OCEANLY LOGISTICS LIMITED | | Live |
| Oceanmall Enterprise Co., Limited | Private company limited by shares | Live |
| OCEANMAN ENTERPRISES LIMITED | Private company limited by shares | Live |
| OCEANMANGO HONG KONG LIMITED | Private company limited by shares | Dissolved |
| OCEANMAP TRADING CO., LIMITED | Private company limited by shares | Dissolved |
| OCEANMARK LIMITED | Private company limited by shares | Dissolved |
| OCEANMARK LIMITED | Private company limited by shares | Dissolved |
| OCEANMARK ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OCEANMARK INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| OCEANMATE LIMITED | Private company limited by shares | Dissolved |
| OCEANMAX AQUARIUM CO., LIMITED | Private company limited by shares | Live |
| OCEANMAX MARINE SERVICE (HONGKONG) LIMITED | Private company limited by shares | Live |
| OCEANMAX INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OCEANMAX INTERNATIONAL LIMITED | Private company limited by shares | Live |
| Oceanmax Shipping Limited | Private company limited by shares | Live |
| OCEANMAX TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| OCEANMED HEALTH (HK) LIMITED | Private company limited by shares | Dissolved |
| OCEANMED SEASKY SYSTEM LIMITED | Private company limited by shares | Dissolved |
| OCEANMILL INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| OCEANMINT LIMITED | Private company limited by shares | Dissolved |
| OCEANMIX DEVELOPMENT LIMITED | Private company limited by shares | Dissolved |
| OCEANMO INTERNATIONAL LIMITED | Private company limited by shares | Live |
| HONG KONG OCEANMOBI TECHNOLOGY LIMITED | | Live |
| Oceanmoney Hongkong Company Limited | Private company limited by shares | Live |
| OceanNet Trading Limited | | Live |
| OCEANO LIMITED | Private company limited by shares | Dissolved |
| TRE OCEANO LIMITED | Private company limited by shares | Live |
| Oceano Company Limited | Private company limited by shares | Live |
| Oceano S.A Limited | Private company limited by shares | Live |
| OCEANO LIMITED | | Live |
| COMPANHIA ELECTRIC OCEANO ( HK ) LIMITED | Private company limited by shares | Live |
| COMPANHIA INDUSTRIAL OCEANO ( HK) LIMITED | Private company limited by shares | Dissolved |
| OCEANOGRAPHER LIMITED | Private company limited by shares | Dissolved |
| OCEANOLOGY HONGKONG LIMITED | Private company limited by shares | Live |
| Ocean&Oscar Limited | Private company limited by shares | Live |
| Oceanous Limited | Private company limited by shares | Live |
| OCEANOWAYS MARITIME LIMITED | Private company limited by shares | Live |
| OCEANPASS INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Oceanpay Technology Limited | Private company limited by shares | Live |
| Oceanpayment Co., Limited | Private company limited by shares | Live |
| OCEANPEARL ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OCEANPEER INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Oceanpine Future Limited | Private company limited by shares | Live |
| Oceanpine Capital Management Limited | Private company limited by shares | Live |
| Oceanpine Marvelous Limited | Private company limited by shares | Live |
| Oceanpine Triumph Limited | Private company limited by shares | Live |
| OCEANPLACE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| OCEANPLAN LIMITED | Private company limited by shares | Live |
| OCEANPLUS LIMITED | Private company limited by shares | Dissolved |
| OceanPoint Associates Limited | Private company limited by shares | Live |
| OCEAN-POLA LIMITED | Private company limited by shares | Live |
| OCEANPORT CONSTRUCTION CO., LIMITED | Private company limited by shares | Dissolved |
| OCEANPORT PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| OCEANPORT TRADING LIMITED | Private company limited by shares | Dissolved |
| OCEANPROBE LIMITED | Private company limited by shares | Dissolved |
| OCEANPROP LIMITED | Private company limited by shares | Dissolved |