| Ata366 Industrial Co., Limited | Private company limited by shares | Live |
| ATAA Limited | | Live |
| ATABET LIMITED | Private company limited by shares | Live |
| ATAC CPA LIMITED | Private company limited by shares | Live |
| ATAC Group Limited | Private company limited by shares | Live |
| ATACADO GAMES LIMITED | Private company limited by shares | Live |
| ATACAMA BAR LIMITED | Private company limited by shares | Live |
| ATACAMA ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| HongKong Atachi Trading Limited | Private company limited by shares | Live |
| A-Tact Components Limited | Private company limited by shares | Live |
| ATAD LIMITED | Private company limited by shares | Dissolved |
| Atael Child Potential Limited | Private company limited by shares | Live |
| ATAGO LIMITED | | Live |
| ATAHK GROUP LIMITED | Private company limited by shares | Live |
| HK ATAI INTL BUSINESS CO., LIMITED | Private company limited by shares | Live |
| ATAI ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| A-TAI (HK) LIMITED | Private company limited by shares | Dissolved |
| ATAI (HK) LIMITED | Private company limited by shares | Live |
| ATAI INDUSTRIAL (HONGKONG) LIMITED | Private company limited by shares | Live |
| Atai Trading Co., Limited | Private company limited by shares | Live |
| A-TAI INTERNATIONAL TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Ataiwee Company Limited | Private company limited by shares | Live |
| ATAKA Limited | Private company limited by shares | Live |
| Ataka Enterprise Limited | Private company limited by shares | Live |
| ATAKA LUMBER HONG KONG LIMITED | Private company limited by shares | Dissolved |
| ATAKA STAR PAPER CENTRE (H.K.) LIMITED | Private company limited by shares | Dissolved |
| ATAKI JEWELLERY LIMITED | Private company limited by shares | Live |
| ATAL LIMITED | Private company limited by shares | Dissolved |
| ATAL INTERNATIONAL (HK) ARCHITECTURAL PLANNING & LANDSCAPE DESIGN LIMITED | Private company limited by shares | Live |
| USA ATAL INT'L ARCHITECTURE & LANDSCAPE DESIGN (ASIA) CO., LIMITED | Private company limited by shares | Live |
| USA ATALAN GROUP LIMITED | Private company limited by shares | Live |
| ATALANTA LIMITED | Private company limited by shares | Dissolved |
| Atalanta International Trading Limited | Private company limited by shares | Live |
| ATALAYA LIMITED | Private company limited by shares | Live |
| ATALENT LIMITED | Private company limited by shares | Live |
| ATalent Consultants Limited | Private company limited by shares | Dissolved |
| Atalent Consulting Limited | Private company limited by shares | Live |
| ATALENT EXECUTIVE RECRUITMENT CONSULTANCY LIMITED | Private company limited by shares | Live |
| ATALI LIMITED | Private company limited by shares | Dissolved |
| atali 12 Limited | Private company limited by shares | Live |
| ATALIAN COMPANY LIMITED | Private company limited by shares | Live |
| ATalk Limited | Private company limited by shares | Live |
| Atallah Hong Kong Limited | Private company limited by shares | Live |
| Atalon IP Limited | Private company limited by shares | Live |
| Atalon IoT Limited | Private company limited by shares | Live |
| Atamache Limited | Private company limited by shares | Dissolved |
| Atamaia Limited | Private company limited by shares | Live |
| Ataman Limited | Private company limited by shares | Live |
| ATAMI COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATANA INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| ATANA STAR INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ATANANE TRADE CO., LIMITED | Private company limited by shares | Live |
| Atanasov Trading Limited | Private company limited by shares | Live |
| Ataner Limited | Private company limited by shares | Live |
| ATANOR LIMITED | Private company limited by shares | Live |
| ATANTIC CO., LIMITED | Private company limited by shares | Live |
| ATANTIS ORIENTAL LIMITED | Private company limited by shares | Dissolved |
| ATAONS LIMITED | Private company limited by shares | Live |
| ATAP LIMITED | Private company limited by shares | Live |
| ATAP ASSOCIATES & COMPANY LIMITED | Private company limited by shares | Live |
| ATAP FASHION LIMITED | Private company limited by shares | Live |
| ATAPCB Technology Limited | Private company limited by shares | Live |
| ATAPOWER LIMITED | Private company limited by shares | Dissolved |
| ATAPUPA COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATAR MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| Ataraxia Limited | | Live |
| ATARCAR COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATARECO COTTON YARN COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATARITEX COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATARO ELECTRONICS MANUFACTURING LIMITED | Private company limited by shares | Dissolved |
| ATARO ENTERPRISES (H.K.) LIMITED | Private company limited by shares | Dissolved |
| Atarra Limited | Private company limited by shares | Live |
| Atarta Trade Limited | Private company limited by shares | Live |
| ATAS LIMITED | Private company limited by shares | Live |
| ATAS CREW LIMITED | Private company limited by shares | Live |
| ATASHI CELESTITE WORLD CO., LIMITED | Private company limited by shares | Live |
| ATASHI (H.K.) LIMITED | Private company limited by shares | Dissolved |
| ATASHIP ASIA LIMITED | Private company limited by shares | Dissolved |
| A-TASK TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| Ataski Limited | Private company limited by shares | Live |
| ATASMI LIMITED | Private company limited by shares | Dissolved |
| ATAT ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ATAT HOLDING LIMITED | Private company limited by shares | Live |
| ATATA COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATATO LIMITED | Private company limited by shares | Live |
| ATAVIST LIMITED | Private company limited by shares | Live |
| Atavus Limited | Private company limited by shares | Live |
| ATAWA LIMITED | Private company limited by shares | Live |
| ATAWAY LIMITED | Private company limited by shares | Live |
| ATAX INVESTMENT (H.K.) LIMITED | Private company limited by shares | Dissolved |
| ATAX MANAGEMENT LIMITED | Private company limited by shares | Live |
| ATAX ADVERTISING & MARKETING CONSULTANT COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATAX STUDIO LIMITED | Private company limited by shares | Dissolved |
| HONG KONG SPINOCEREBELLAR ATAXIA ASSOCIATION LIMITED | Company limited by guarantee | Live |
| Atayal Workshop Limited | Private company limited by shares | Live |
| ATAZZO LIMITED | Private company limited by shares | Live |