| Oldco (DM) Limited | Private company limited by shares | Live |
| Olden Time Limited | | Live |
| OLDENBURG LIMITED | Private company limited by shares | Dissolved |
| Oldenburg (Hong Kong) Group Limited | Private company limited by shares | Dissolved |
| EGON OLDENDORFF (ASIA) LIMITED | Private company limited by shares | Dissolved |
| WORLD OLDER CULTURE HEALTH PROPERTY ASSOCIATION LIMITED | Private company limited by shares | Live |
| OLDFAITHFUL COMPANY LIMITED | Private company limited by shares | Live |
| Oldfazhioned Limited | Private company limited by shares | Live |
| OLDFIELD ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| OLDFORD LIMITED | Private company limited by shares | Dissolved |
| OLDFORD ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| HONGKONG OLDFRIENDKIM TECHNOLOGY COPERATION LIMITED | Private company limited by shares | Live |
| OLDFRONT EXPRESS LIMITED | Private company limited by shares | Dissolved |
| OLDHALL LIMITED | Private company limited by shares | Dissolved |
| OLDHAM LAND INVESTMENT COMPANY, LIMITED | Private company limited by shares | Dissolved |
| OLDHAM TRADING LIMITED | Private company limited by shares | Dissolved |
| OLDHAVEN COMPANY LIMITED | Private company limited by shares | Dissolved |
| FRANCE OLDHEAR GARMENT (HK) TRADING LIMITED | Private company limited by shares | Dissolved |
| OLDHK COMPANY LIMITED | Private company limited by shares | Dissolved |
| OLDIES PUB LIMITED | Private company limited by shares | Dissolved |
| OLDIES (CATERING) COMPANY LIMITED -THE- | Private company limited by shares | Dissolved |
| OLDISH LIMITED | Private company limited by shares | Live |
| OldKing Jewels Limited | | Live |
| Oldlang Group Co., Limited | Private company limited by shares | Live |
| OLDLINK LIMITED | Private company limited by shares | Dissolved |
| FRANCE OLDMAN FASHION LIMITED | Private company limited by shares | Dissolved |
| FRANCE GANGSHI OLDMAN FASHION LIMITED | Private company limited by shares | Dissolved |
| JIESHI OLDMAN SHOES AND CLOTHES LIMITED | Private company limited by shares | Live |
| OLDMAX LIMITED | Private company limited by shares | Dissolved |
| FRENCH OLDMENHEAD FINERY (HK) GROUP LIMITED | Private company limited by shares | Dissolved |
| ITALY OLDMENHEAD INT'L DEV. FINERY LIMITED | Private company limited by shares | Dissolved |
| OLDO-2786 LIMITED | Private company limited by shares | Dissolved |
| OLDORBABY (INTERNATIONAL) INVESTMENT CO., LIMITED | Private company limited by shares | Live |
| Oldseafood Engineering Company Limited | Private company limited by shares | Live |
| Oldsoilism Vintage Clothing And Goods Limited | Private company limited by shares | Live |
| Oldsore Limited | | Live |
| Oldstar Investments Limited | Private company limited by shares | Live |
| CHINESE ESTEEM OLDSTER CHARITY, LIMITED -THE- | Company limited by guarantee | Live |
| OLDTASTE LIMITED | Private company limited by shares | Live |
| OLDTAUN LIMITED | Private company limited by shares | Live |
| OLDTIMERS AUCTION PARTNERS LIMITED | Private company limited by shares | Live |
| OLDTOWN ASIA PACIFIC LIMITED | Private company limited by shares | Live |
| Oldtown Resources Limited | Private company limited by shares | Live |
| OLDWAY (INDUSTRIAL) CO., LIMITED | Private company limited by shares | Live |
| Oldwell Enterprises Limited | Private company limited by shares | Live |
| Oldwich Investment Limited | Private company limited by shares | Live |
| HONG KONG OLDYECAR GARMENTS CO., LIMITED | Private company limited by shares | Dissolved |
| OLD-YOUNG SOCIETY LIMITED | Private company limited by shares | Dissolved |
| Ole' Catering Limited | | Live |
| OLEA LIMITED | Private company limited by shares | Live |
| OLEAD HONG KONG LIMITED | Private company limited by shares | Live |
| OLEAD INTERNATIONAL TRADING LIMITED | Private company limited by shares | Live |
| OLEADA Limited | | Live |
| OLEADA INTERNATIONAL ENTERPRISES LIMITED | Private company limited by shares | Live |
| OLEADER(HK)GROUP COMPANY LIMITED | Private company limited by shares | Live |
| Oleaf Limited | | Live |
| OLEANDER LIMITED | Private company limited by shares | Dissolved |
| OLEANDER LIMITED | Private company limited by shares | Live |
| OLEANDER GROUP LIMITED | Private company limited by shares | Live |
| OLEANDER OFFSHORE LIMITED | Private company limited by shares | Dissolved |
| OLEANDER RICH COMPANY LIMITED | Private company limited by shares | Dissolved |
| OLEANDER TRADING LIMITED | Private company limited by shares | Dissolved |
| Oleander Trading Co Limited | | Live |
| OLEBURG LIMITED | Private company limited by shares | Dissolved |
| FU ZHOU OLE-CN CO., LIMITED | Private company limited by shares | Live |
| OLECULE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| AGL OLED LIMITED | Private company limited by shares | Live |
| OLED LIMITED | Private company limited by shares | Live |
| STF OLED LIMITED | Private company limited by shares | Live |
| OLED HONOR LIMITED | Private company limited by shares | Live |
| OLED INDUSTRY LIMITED | Private company limited by shares | Live |
| OLED LOYALTY LIMITED | Private company limited by shares | Live |
| OLED IC Microelectronics Limited | Private company limited by shares | Live |
| OLED STAR LIMITED | Private company limited by shares | Live |
| OLEDER LIGHTING CO., LIMITED | Private company limited by shares | Live |
| O'LEE LIMITED | Private company limited by shares | Live |
| OLEECE TRADING LIMITED | Private company limited by shares | Live |
| OLEEVER ACCESSORIES CO., LIMITED | Private company limited by shares | Live |
| OLEG LIMITED | Private company limited by shares | Dissolved |
| OLEG TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| HK OLEG TRADE LIMITED | Private company limited by shares | Live |
| oLegal Limited | Private company limited by shares | Live |
| OLEGEI INTERNATIONAL TRADING LIMITED | | Live |
| Oleh Oleh Limited | Private company limited by shares | Live |
| OLEKO TRADING LIMITED | Private company limited by shares | Live |
| Olelon Limited | | Live |
| OLEMAR MARINE-FUELS LIMITED | Private company limited by shares | Live |
| HONG KONG OLEMY BIOLOGICAL TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| OLEN DEFENCE LIMITED | Private company limited by shares | Live |
| OLEN (HK) GROUP LIMITED | | Live |
| HONGKONG OLEN NEW ENERGY CO., LIMITED | Private company limited by shares | Live |
| HK OLEN INT'L FURNITURE LIMITED | Private company limited by shares | Dissolved |
| OLEN PLUS LIMITED | Private company limited by shares | Live |
| OLENA LIMITED | Private company limited by shares | Dissolved |
| OLENA MANDRYK PHOTOGRAPHY LIMITED | | Live |
| OLENICE COMPANY LIMITED | Private company limited by shares | Dissolved |
| OLENSCON LIMITED | Private company limited by shares | Live |
| AMERICAN OLEO COMPANY LIMITED | Private company limited by shares | Dissolved |
| HORIZON OLEO CO., LIMITED | | Live |
| WEALTHIN OLEO CO., LIMITED | | Live |