| CREATIVE SIGNAL LIMITED | Private company limited by shares | Live |
| DAILY SIGNAL LIMITED | Private company limited by shares | Live |
| SIGNAL DIGITAL LIMITED | Private company limited by shares | Dissolved |
| NEW SIGNAL ELECTRONICS LIMITED | Private company limited by shares | Dissolved |
| Signal Engineering Limited | Private company limited by shares | Live |
| DAILY SIGNAL ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| SIGNAL ENTERPRISES LIMITED | Private company limited by shares | Live |
| Signal Entertainment HK Limited | Private company limited by shares | Live |
| EVER SIGNAL LIMITED | Private company limited by shares | Dissolved |
| EXPRESS SIGNAL LIMITED | Private company limited by shares | Dissolved |
| SIGNAL 8 EYEWEAR LIMITED | Private company limited by shares | Live |
| FORCE SIGNAL LIMITED | Private company limited by shares | Dissolved |
| FORTUNE SIGNAL LIMITED | Private company limited by shares | Dissolved |
| FULL SIGNAL COMPANY LIMITED | Private company limited by shares | Live |
| GAIN SIGNAL LIMITED | Private company limited by shares | Dissolved |
| G.D. SIGNAL LIMITED | Private company limited by shares | Dissolved |
| GEAR SIGNAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| GLOBAL SIGNAL CO., LIMITED | Private company limited by shares | Live |
| GOLD SIGNAL LIMITED | Private company limited by shares | Dissolved |
| GOLD SIGNAL LIMITED | Private company limited by shares | Live |
| GOLDWELL SIGNAL LIMITED | Private company limited by shares | Dissolved |
| GOOD SIGNAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| GOOD SIGNAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| GREETING SIGNAL LIMITED | Private company limited by shares | Dissolved |
| Key Signal Group Limited | Private company limited by shares | Live |
| SIGNAL GROUP LIMITED | Private company limited by shares | Live |
| SIGNAL CAPITAL GROUP, LIMITED | Private company limited by shares | Dissolved |
| Signal Entertainment Group Limited | Private company limited by shares | Live |
| SIGNAL LUX HONG KONG LIMITED | Private company limited by shares | Dissolved |
| TOP SIGNAL HONG KONG LIMITED | Private company limited by shares | Dissolved |
| INTER SIGNAL LIMITED | Private company limited by shares | Dissolved |
| BIG SIGNAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| MAY SIGNAL INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| D SIGNAL INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Signal Investments Limited | Private company limited by shares | Live |
| HOPE SIGNAL INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| RICH SIGNAL INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| JOIN SIGNAL LIMITED | Private company limited by shares | Dissolved |
| Signal Dynamics Hong Kong Limited | Private company limited by shares | Live |
| Lead Signal Limited | Private company limited by shares | Live |
| LUCKY SIGNAL LIMITED | Private company limited by shares | Dissolved |
| SIGNAL 8 MODEL MANAGEMENT LIMITED | Private company limited by shares | Live |
| MARK SIGNAL LIMITED | Private company limited by shares | Dissolved |
| Signal Master Limited | | Live |
| OCEAN SIGNAL LIMITED | Private company limited by shares | Live |
| PEACE SIGNAL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| POWER SIGNAL COMPANY LIMITED | Private company limited by shares | Live |
| PRETTY SIGNAL LIMITED | Private company limited by shares | Dissolved |
| Signal Projects Limited | Private company limited by shares | Live |
| DIGITAL PURE SIGNAL LIMITED | Private company limited by shares | Live |
| RICH SIGNAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| RICH SIGNAL LIMITED | Private company limited by shares | Live |
| Signal Search Limited | Private company limited by shares | Live |
| SIGNAL 8 SECURITY LIMITED | Private company limited by shares | Live |
| SMART SIGNAL LIMITED | Private company limited by shares | Live |
| Signal of Souls Limited | | Live |
| SIGNAL SPREADER ENTERTAINMENT CO. LIMITED | Private company limited by shares | Dissolved |
| STAR SIGNAL LIMITED | Private company limited by shares | Dissolved |
| STRONG SIGNAL LIMITED | Private company limited by shares | Dissolved |
| SIGNAL STUDIO LIMITED | Private company limited by shares | Dissolved |
| SIGNAL SUCCESS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SURE SIGNAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIGNAL SYSTEMS COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIGNAL TECH ASIA LIMITED | Private company limited by shares | Dissolved |
| SIGNAL TECHNOLOGIES COMPANY LIMITED | Private company limited by shares | Live |
| SIGNAL TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Signal Egg Technology Limited | | Live |
| Signal Technology Holding Consultancy Limited | Private company limited by shares | Live |
| SIGNAL THREE LIMITED | Private company limited by shares | Dissolved |
| SIGNAL THREE LIMITED | Private company limited by shares | Live |
| TIME SIGNAL LIMITED | Private company limited by shares | Dissolved |
| HK SIGNAL TRADE LIMITED | Private company limited by shares | Live |
| RICH SIGNAL TRADING LIMITED | Private company limited by shares | Dissolved |
| TUNE SIGNAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| United Signal Limited | Private company limited by shares | Live |
| WANY SIGNAL LIMITED | Private company limited by shares | Dissolved |
| WELL SIGNAL LIMITED | Private company limited by shares | Dissolved |
| WELL CHANGE SIGNAL LIMITED | Private company limited by shares | Dissolved |
| WELL SIGNAL INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| WISE SIGNAL LIMITED | Private company limited by shares | Live |
| SIGNAL WISE LIMITED | Private company limited by shares | Dissolved |
| WITLONG SIGNAL LIMITED | Private company limited by shares | Dissolved |
| YOUNG SIGNAL COMPANY LIMITED | Private company limited by shares | Live |
| SignalBio Limited | Private company limited by shares | Live |
| SIGNALCON LIMITED | Private company limited by shares | Dissolved |
| SIGNALING LIMITED | Private company limited by shares | Live |
| ADVANCED SIGNALING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SIGNALINKS LIMITED | Private company limited by shares | Live |
| SIGNALINKS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Signalint Limited | Private company limited by shares | Live |
| TRANSPORT SIGNALLING LIMITED | Private company limited by shares | Dissolved |
| SIGNALPLUS HK Limited | | Live |
| COMPUTEC SIGNALS LIMITED | Private company limited by shares | Live |
| Deep Signals Limited | Private company limited by shares | Live |
| Eleven Signals Technology Limited | Private company limited by shares | Live |
| 21 SIGNALS INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| SAKSHAM TRANSPORT SIGNALS PRIVATE LIMITED | Private company limited by shares | Live |
| SHARP SIGNALS ASSET MANAGEMENT CO., LIMITED | Private company limited by shares | Live |
| Signals Technologies Limited | | Live |
| TRITRONIC SIGNALS LIMITED | Private company limited by shares | Live |