| 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 |
| A.T.B. PACIFIC LIMITED | Private company limited by shares | Dissolved |
| ATBASCA LIMITED | Private company limited by shares | Dissolved |
| ATBASHY INTERNATIONAL TRADE CO., LIMITED | | Live |
| ATBEST INVESTMENTS LIMITED | Private company limited by shares | Live |
| ATBHK LIMITED | | Live |
| ATBINARY LIMITED | Private company limited by shares | Dissolved |
| AT-BT Solutions Limited | Private company limited by shares | Live |
| A.T.C. LIMITED | Private company limited by shares | Dissolved |
| ATCC LIMITED | Private company limited by shares | Dissolved |
| ZAMIR & ATCCO INTERNATIONAL CO., LIMITED | Private company limited by shares | Live |
| ATCG LIMITED | Private company limited by shares | Live |
| ATCG CONSULTING CO., LIMITED | Private company limited by shares | Dissolved |
| ATCG International Limited | Private company limited by shares | Live |
| ATCGENE MEDICAL CENTRE LIMITED | Private company limited by shares | Live |
| Atchaincg Co., Limited | Private company limited by shares | Live |
| AT-CHINESE (HK) LIMITED | Private company limited by shares | Live |
| ATCHISON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ATCHO COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCHO LIMITED | | Live |
| AtCipher.com Limited | Private company limited by shares | Live |
| ATCL INDUSTRIAL CORP. LIMITED | Private company limited by shares | Live |
| ATCN TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ATCNET TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ATCO ASIA COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO (CHINA) INVESTMENTS LIMITED | Private company limited by shares | Live |
| ATCO CO., LIMITED | Private company limited by shares | Live |
| ATCO FAR EAST COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO ENTERPRISE LIMITED | Private company limited by shares | Live |
| ATCO Construction (Hong Kong) Limited | Private company limited by shares | Live |
| ATCO INDUSTRIAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| Atco Industrial Limited | Private company limited by shares | Live |
| SHENZHEN ATCO INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| ATCO INTERNATIONAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO INTERNATIONAL HK LIMITED | Private company limited by shares | Dissolved |
| ATCO INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ATCO INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| ATCO PACIFIC COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO TOYS COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATCO TRADING COMPANY LIMITED | Private company limited by shares | Live |
| ATCO UNIVERSAL LIMITED | Private company limited by shares | Live |
| ATCON ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| ATC-PRODUCTS LIMITED | Private company limited by shares | Dissolved |
| ATCROSSWORKSHOP COMPANY LIMITED | Private company limited by shares | Live |
| ATDT Limited | Private company limited by shares | Live Commenced dormancy on 04-Jun-2018 |
| A.T.E. Design Company Limited | | Live |
| A-TEAM LIMITED | Private company limited by shares | Live |
| ATeam M2E Limited | Private company limited by shares | Live |
| A-TEAM COMPUTER LIMITED | Private company limited by shares | Live |
| A-TEAM EMPLOYMENT SERVICE CENTRE LIMITED | Private company limited by shares | Dissolved |
| Ateam Group Limited | Private company limited by shares | Live |
| ATEAM TESTING AND CONSULTANCY COMPANY LIMITED | Private company limited by shares | Live |
| A-TEAM TRADING COMPANY LIMITED | Private company limited by shares | Live |
| A-TeamsGlobal Limited | Private company limited by shares | Live |
| ATEASE HEALTHCARE LIMITED | Private company limited by shares | Live |
| ATEASE REHABILITATION SERVICE LIMITED | Private company limited by shares | Live |
| A-TECH LIMITED | Private company limited by shares | Dissolved |
| ATECH COMPANY LIMITED | Private company limited by shares | Dissolved |
| ATECH LIMITED | Private company limited by shares | Live |
| Atech Aquatics Limited | Private company limited by shares | Live |
| A-TECH COURIER CENTRE LIMITED | Private company limited by shares | Dissolved |
| A-TECH ENTERPRISE LIMITED | Private company limited by shares | Dissolved |
| A-TECH ENTERPRISE LIMITED | Private company limited by shares | Live |
| ATECH INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| A-TECH INVESTMENTS LIMITED | Private company limited by shares | Live |
| ATECH MACHINERY LIMITED | Private company limited by shares | Live |
| ATECH PLASTIC MANUFACTORY LIMITED | Private company limited by shares | Dissolved |
| A-TECH PACIFIC LIMITED | Private company limited by shares | Dissolved |
| A-TECH PRECISION LIMITED | Private company limited by shares | Dissolved |
| SCENARIO ATECH LIMITED | Private company limited by shares | Dissolved |
| A-TECH SCIENTIFIC LIMITED | Private company limited by shares | Dissolved |
| ATECH SCIENTIFIC MEASUREMENT LIMITED | Private company limited by shares | Live |
| ATech Solution Limited | Private company limited by shares | Live |
| ATECH SYSTEM LIMITED | Private company limited by shares | Dissolved |
| A-TECH SYSTEMS LIMITED | Private company limited by shares | Live |
| ATECHBCN HK LIMITED | | Live |
| A-TECHEM DEVELOPMENT (H.K.) CO., LIMITED | Private company limited by shares | Dissolved |
| ATECHNICS LIMITED | Private company limited by shares | Dissolved |
| A-TECHNOLOGY HK CO., LIMITED | | Live |
| ATECO LIMITED | Private company limited by shares | Dissolved |
| ATECO LIMITED | Private company limited by shares | Dissolved |
| ATECO COMPANY LIMITED | Private company limited by shares | Live |
| ATECT TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ATED LIMITED | Private company limited by shares | Live |
| Good AtEd Limited | Private company limited by shares | Live |
| ATED INVESTMENT LIMITED | Private company limited by shares | Live |
| ATEDIA LIMITED | Private company limited by shares | Dissolved |
| ATEE ASSOCIATION LIMITED | Company limited by guarantee | Dissolved |