| ATTO DRY CLEANING LIMITED | Private company limited by shares | Dissolved |
| ATTO INKJET CO., LIMITED | | Live |
| Atto Healthcare Limited | Private company limited by shares | Live |
| HONG KONG ATTO INVESTMENT LIMITED | Private company limited by shares | Live |
| ATTO INSTRUMENTS LIMITED | Private company limited by shares | Live |
| ATTO INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ATTO INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SHARING GROUP ATTO INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| PRIMO ATTO GROUP LIMITED | Private company limited by shares | Dissolved |
| ATTO RESTAURANT LIMITED | Private company limited by shares | Dissolved |
| ATTO SUPPLIES COMPANY LIMITED | Private company limited by shares | Live |
| AttoBio Limited | Private company limited by shares | Live |
| ATTOCK OIL SERVICES (FAR EAST) LIMITED | Private company limited by shares | Dissolved |
| ATTOEXA LIMITED | Private company limited by shares | Live |
| ATTO&K. HK LIMITED | Private company limited by shares | Live |
| ATTOLLO INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ATTOMS LIMITED | Private company limited by shares | Live |
| ATTON LIMITED | Private company limited by shares | Live |
| ATTOP LIMITED | Private company limited by shares | Live |
| ATTOP LIMITED | Private company limited by shares | Live |
| ATTOP GROUP LIMITED | | Live |
| Attop International Limited | Private company limited by shares | Dissolved |
| ATTOP INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ATTOP PLAN LIMITED | Private company limited by shares | Dissolved |
| ATTOP RATE LIMITED | Private company limited by shares | Dissolved |
| ATTOQO LIMITED | Private company limited by shares | Live |
| ATTORE ENTERPRISES COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATTORE INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ATTORNEY 4 U LIMITED | Private company limited by shares | Live |
| ATTORNEY CONSULTANCY LIMITED | | Live |
| Asian Pacific International Attorney Institute Group Holding Limited | Private company limited by shares | Live |
| SOCCER ATTORNEY ASSOCIATED LIMITED | Private company limited by shares | Live |
| PRC ATTORNEYS LIMITED | Private company limited by shares | Dissolved |
| Greater China Intellectual Property Attorneys Association Limited | Company limited by guarantee | Live |
| INTERNATIONAL ASSOCIATED ATTORNEYS LIMITED | Private company limited by shares | Live |
| LUNG TIN SINKO IP ATTORNEYS LIMITED | Private company limited by shares | Dissolved |
| UNITALEN ATTORNEYS AT LAW LIMITED | Private company limited by shares | Live |
| ATTOS GROUP LIMITED | Private company limited by shares | Live |
| ATTOS GROUP HOLDING LIMITED | Private company limited by shares | Live |
| ATTOTECH LIMITED | Private company limited by shares | Live |
| ATTOTEK COMPUTER LIMITED | Private company limited by shares | Live |
| ATTOTRONICS COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATTOTT GROUP (HONG KONG) LIMITED | Private company limited by shares | Dissolved |