| ATOM LIMITED | Private company limited by shares | Live |
| ATOM HK CO. LIMITED | Private company limited by shares | Dissolved |
| ATOM 8 LIMITED | Private company limited by shares | Live |
| Atom Bro Limited | Private company limited by shares | Live |
| Big Atom Limited | | Live |
| FIRST ATOM LIMITED | Private company limited by shares | Live |
| Atomade Limited | Private company limited by shares | Live |
| atomata Limited | Private company limited by shares | Live |
| ATOMATIC COMPANY LIMITED | Private company limited by shares | Dissolved |
| Atomatic Limited | | Live |
| ATOMBABY LIMITED | Private company limited by shares | Live |
| ATOMBASE LIMITED | Private company limited by shares | Dissolved |
| Atome HK Limited | Private company limited by shares | Live |
| ATOME TRADING AGENT LIMITED | Private company limited by shares | Dissolved |
| ATOMENTAL CAPITAL (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| Atomess System Technology Co., Limited | | Live |
| Atomhash Limited | | Live |
| ATOMIC LIMITED | Private company limited by shares | Dissolved |
| ATOMIC LIMITED | Private company limited by shares | Live |
| Atomic E Limited | Private company limited by shares | Live |
| ATOMIC ADVERTISING LIMITED | Private company limited by shares | Live |
| ATOMIC BLENDER LIMITED | Private company limited by shares | Live |
| ATOMIC CAPITAL LIMITED | Private company limited by shares | Dissolved |
| Atomic Capital Limited | Private company limited by shares | Live |
| Atomic Factors Limited | | Live |
| ATOMIC GOLD LIMITED | Private company limited by shares | Live |
| Atomic Innovation Limited | Private company limited by shares | Live |
| ATOMIC INTERACTIONS LIMITED | Private company limited by shares | Dissolved |
| ATOMIC INVESTMENT LIMITED | Private company limited by shares | Live |
| ATOMIC SPORTS LIMITED | Private company limited by shares | Dissolved |
| ATOMIC STREAM LIMITED | Private company limited by shares | Live |
| AtomicAdd Co., Limited | Private company limited by shares | Live |
| ATOMICALL Limited | Private company limited by shares | Live |
| ATOMICLIGHT CO., LIMITED | Private company limited by shares | Live |
| AtomicNexus Limited | Private company limited by shares | Live |
| ATOMIK F&B LIMITED | Private company limited by shares | Live |
| ATOMIK CAPITAL LIMITED | Private company limited by shares | Live |
| ATOMITAD LIMITED | Private company limited by shares | Live |
| AtomJam Entertainment Limited | Private company limited by shares | Dissolved |
| Atomlantis Network Co, Limited | | Live |
| ATOMLUX SYSTEMS (HK) LIMITED | Private company limited by shares | Dissolved |
| Atomo Limited | Private company limited by shares | Live |
| ATOMOLE SCIENTIFIC CO., LIMITED | Private company limited by shares | Live |
| ATOMOS LIMITED | Private company limited by shares | Live |
| ATOMS LIMITED | Private company limited by shares | Live |
| ATOMSTACK INDUSTRIES (HONG KONG) LIMITED | | Live |
| AtomStack Technologies (Hong Kong) Co. , Limited | | Live |
| Atomsun International Proprietary Limited | Private company limited by shares | Live |
| ATOMU Global Co., Limited | Private company limited by shares | Dissolved |
| Atomu (Hong Kong) Co., Limited | Private company limited by shares | Live |
| AtomVest Limited | Private company limited by shares | Live |
| AtomX Limited | Private company limited by shares | Live |