| Oakmont Solutions Limited | | Live |
| OAKMOUNT LIMITED | Private company limited by shares | Dissolved |
| OAKMOUNT COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKMOUNT LIMITED | | Live |
| OAKOVER GROUP LIMITED | Private company limited by shares | Live |
| OAKPLUS LIMITED | Private company limited by shares | Dissolved |
| OAKRIDGE, LIMITED | Private company limited by shares | Dissolved |
| OAKRIDGE LIMITED | Private company limited by shares | Dissolved |
| Oakridge Company Limited | Company limited by guarantee | Live |
| OAKRIDGE (HONG KONG) CORPORATION LIMITED | Private company limited by shares | Live |
| OAKRIDGE ENTERPRISES LIMITED | Private company limited by shares | Live |
| Oakridge Holding Limited | Private company limited by shares | Live |
| OAKRIDGE HOLDINGS LIMITED | | Live |
| Oakridge Global Energy Solutions (Hong Kong) Limited | Private company limited by shares | Live |
| Oakridge International Consulting Limited | Private company limited by shares | Live |
| OAKRIDGE INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| OAKRIDGE INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| North Oakridge Asset Management Limited | Private company limited by shares | Live |
| Oakridge Overseas Investment Company Limited | | Live |
| Oakridge Wholesale Limited | Private company limited by shares | Live |
| OAKS LIMITED -THE- | Company limited by guarantee | Live |
| Two Oaks Limited | Private company limited by shares | Live |
| OAKS CAFE COMPANY LIMITED | Private company limited by shares | Live |
| Red Oaks Co., Limited | Private company limited by shares | Live |
| Oaks Education Limited | Private company limited by shares | Live |
| Young Oaks Education Pty Limited | Private company limited by shares | Live |
| FAIR OAKS LIMITED | Private company limited by shares | Dissolved |
| FIVE OAKS LIMITED | Private company limited by shares | Live |
| GREEN OAKS LIMITED | Private company limited by shares | Dissolved |
| Oaks Functional Holistics Limited | | Live |
| OAKS FURNITURE (HONG KONG) LIMITED | Private company limited by shares | Live |
| GRAND OAKS ASSET MANAGEMENT CO., LIMITED | Private company limited by shares | Live |
| OAKS PARK LIMITED | Private company limited by shares | Dissolved |
| River Oaks Universal Limited | Private company limited by shares | Live |
| RIVERS AND OAKS LIMITED | Private company limited by shares | Live |
| SHERMAN OAKS LIMITED | Private company limited by shares | Dissolved |
| Oaks Trading Limited | Private company limited by shares | Live |
| Royal Oaksio Limited | | Live |
| OAKSLEY (ASIA) LIMITED | Private company limited by shares | Dissolved |
| Oaksoft Services Limited | Private company limited by shares | Live |
| HONG KONG OAK-TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKTON COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKTON LIMITED | Private company limited by shares | Dissolved |
| Oaktone, Limited | Private company limited by shares | Live |
| OAKTREE LIMITED | Private company limited by shares | Dissolved |
| Oaktree LME Limited | Private company limited by shares | Live |
| Oaktree Capital Limited | Private company limited by shares | Live |
| Oaktree Consultants Hong Kong Limited | Private company limited by shares | Live |
| OAKTREE CONSULTING CO., LIMITED | Private company limited by shares | Live |
| Oaktree Global Consulting Limited | Private company limited by shares | Live |
| Oaktree Consulting & Service Company Limited | | Live |
| OakTree Fund Services Limited | Private company limited by shares | Live |
| Oaktree Asia Pacific (HK) Company Limited | Private company limited by shares | Live |
| Oaktree Holdings Limited | Private company limited by shares | Live |
| Oaktree Capital (Hong Kong) Limited | Private company limited by shares | Live |
| HONGKONG OAKTREE GROUP LIMITED | Private company limited by shares | Live |
| Oaktree Industrial Tech Limited | Private company limited by shares | Live |
| Oaktree International (HK) Limited | Private company limited by shares | Live |
| OAKTREE INVESTMENTS LIMITED | Private company limited by shares | Live |
| OAKTREE MEDICAL LIMITED | Private company limited by shares | Dissolved |
| OAKUNAMU COMPANY LIMITED | Private company limited by shares | Live |
| OAKVILLE LIMITED | Private company limited by shares | Dissolved |
| OAKVILLE INC. ASIA LIMITED | Private company limited by shares | Live |
| OAKVILLE PROPERTIES LIMITED | Private company limited by shares | Dissolved |
| OAKWAY LIMITED | Private company limited by shares | Dissolved |
| OAKWAY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| OAKWELL LIMITED | Private company limited by shares | Dissolved |
| OAKWICK ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OAKWISE LIMITED | Private company limited by shares | Live |
| Oakwise Investment Consulting (Hong Kong) Limited | Private company limited by shares | Live |
| Oakwise Group Limited | Private company limited by shares | Live |
| Oakwise Capital Management Limited | Private company limited by shares | Live |
| Oakwise Securities Limited | Private company limited by shares | Live |
| Oakwise Consumer Trends Investment Limited | Private company limited by shares | Live |
| Oakwise Trust Limited | Public company limited by shares | Live |
| OAKWOOD COMPANY LIMITED | Private company limited by shares | Dissolved |
| OAKWOOD LIMITED | Private company limited by shares | Dissolved |
| OAKWOODINV LIMITED | Private company limited by shares | Live |
| OAKWORTH LIMITED | Private company limited by shares | Live |
| OAKY LIMITED | Private company limited by shares | Dissolved |
| OAKY (H.K.) LIMITED | Private company limited by shares | Dissolved |
| OAKYO LIMITED | Private company limited by shares | Live |
| O.A.L. CO., LIMITED | Private company limited by shares | Dissolved |
| OALE SMART INDUSTRIAL (HK) CO., LIMITED | Private company limited by shares | Live |
| OALEN Cosmetics Limited | Private company limited by shares | Live |
| OALEX FREIGHT LIMITED | Private company limited by shares | Live |
| HONG KONG OAMIC INVESTMENT LIMITED | Private company limited by shares | Live |
| OANDA Hong Kong Limited | Private company limited by shares | Live |
| Oannes Publishing Company Limited | Private company limited by shares | Live |
| OANP Trading Company Limited | Private company limited by shares | Live |
| HK O.A.O. CLOTHING DESIGN LIMITED | Private company limited by shares | Dissolved |
| OAOBO INTERNATIONAL ORIGINAL FURNITURE GROUP CO., LIMITED | Private company limited by shares | Dissolved |
| OAPRO COMPUTER SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| OARBROOK LIMITED | Private company limited by shares | Dissolved |
| OARSMAN COMPANY LIMITED | Private company limited by shares | Dissolved |
| OARSMAN MARINE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| HONGKONG OASA INTERNATIONAL TRADING CO., LIMITED | Private company limited by shares | Live |
| OASA INDUSTRIAL LIMITED | Private company limited by shares | Live |
| OASAP LIMITED | Private company limited by shares | Live |
| OASEM TRADE LIMITED | Private company limited by shares | Live |