| SYMPHONY COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| SYNC COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SYNCHRONIC COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SYNECTICS COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| SYNERG COMMUNICATIONS, LIMITED | Private company limited by shares | Dissolved |
| SYSTEM COMMUNICATIONS (H.K.) LIMITED | Private company limited by shares | Live |
| SEACORP COMMUNICATIONS SYSTEMS (HK) LIMITED | Private company limited by shares | Dissolved |
| SZCHAOHAO COMMUNICATIONS INT'L LIMITED | Private company limited by shares | Dissolved |
| TACTIC COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TALENT COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| UNITED TALENTS COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| EASY TALK COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| Talors Communications Limited | Private company limited by shares | Live |
| TAMA COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TAMBERCE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TANGRAM COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| INK TANK COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| THINK TANK COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TANTUM COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TANYA COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TEAM UP COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TEAM TOP COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| ONE TEAM COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TEAMWELL COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TEAMWORK COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TECHBRIDGE COMMUNICATIONS LIMITED | Private company limited by shares | Live Commenced dormancy on 29-Jun-2007 |
| TECHIFORD COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TECHNO COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TECHNO FACTOR (SYSTEM COMMUNICATIONS) LIMITED | Private company limited by shares | Dissolved |
| HK Qitong Network Communications Technolog Limited | Private company limited by shares | Live |
| CHINA PACIFIC OCEAN COMMUNICATIONS TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |
| Horsen Communications Technologies Co., Limited | Private company limited by shares | Live Commenced dormancy on 16-Aug-2018 |
| LongTime Communications Technologies Limited | Private company limited by shares | Live |
| SPECTRUM & MASTER COMMUNICATIONS TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| GENERAL COMMUNICATIONS & TRANSPORTATION TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |
| VICTORY COMMUNICATIONS & TECHNOLOGIES CORPORATION LIMITED | Private company limited by shares | Dissolved |
| TMT COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| WAT Communications Technology Company Limited | Private company limited by shares | Live |
| JX Technology and Communications Limited | Private company limited by shares | Live |
| A-ONE COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| AQUANTA COMMUNICATIONS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| KEY COMMUNICATIONS TECHNOLOGY (ASIA) LIMITED | Private company limited by shares | Dissolved |
| BeeConnect Communications Technology Limited | Private company limited by shares | Dissolved |
| CHARM COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| CHINA COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| CHINA COMMUNICATIONS DIGITAL TECHNOLOGY CO., LIMITED | | Live |
| CHINA BEI DOU COMMUNICATIONS TECHNOLOGY GROUP LIMITED | Private company limited by shares | Live |
| CHINA ENTERPRISE COMMUNICATIONS TECHNOLOGY (HOLDING) LIMITED | Private company limited by shares | Live |
| China Communications Technology (HongKong) Limited | Private company limited by shares | Live |
| MPA COMMUNICATIONS TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| HK V2 COMMUNICATIONS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Shenzhen Hua Hao Communications Technology Co., Limited | Private company limited by shares | Live |
| T & P COMMUNICATIONS TECHNOLOGY CORPORATION LIMITED | Private company limited by shares | Dissolved |
| Easy Communications International Technology Limited | Private company limited by shares | Live |
| FORME COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| DIGITAL FRIENDLY COMMUNICATIONS TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Live |
| GUANGZHOU BUBUKAO COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| COMMUNICATIONS TECHNOLOGY ( H.K. ) LIMITED | Private company limited by shares | Dissolved |
| GS COMMUNICATIONS TECHNOLOGY (HK) LIMITED | Private company limited by shares | Live |
| 588 Communications Technology (HK) Limited | | Live |
| HK HUACHUANG COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| HUAQI COMMUNICATIONS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| Communications Technology Investment Limited | Private company limited by shares | Live |
| MAPLE LEAF COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| LEGEND COMMUNICATIONS TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| New Legend Communications Technology Co., Limited | Private company limited by shares | Live |
| LINKING COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| MontCloud Communications Technology Co., Limited | | Live |
| NEOLINK COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Wa Yin Network Technology Communications Limited | Private company limited by shares | Live |
| PACIFIC COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| PHONELIN COMMUNICATIONS TECHNOLOGY (H.K.) CO., LIMITED | Private company limited by shares | Live |
| SPACE COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| TELNET COMMUNICATIONS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| WORLD-POINT COMMUNICATIONS TECHNOLOGY (HK) CO., LIMITED | Private company limited by shares | Live |
| X-LINK COMMUNICATIONS TECHNOLOGY (HK) CO., LIMITED | Private company limited by shares | Live |
| YILONG COMMUNICATIONS TECHNOLOGY (HK) LIMITED | Private company limited by shares | Dissolved |
| SHENZHEN ZHONGYITONG COMMUNICATIONS ELECTRONIC TECHNOLOGY LIMITED | Private company limited by shares | Live |
| TECHNOWLEDGE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TECH-VISION COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| Tech-Vision Communications (Hong Kong) Limited | Private company limited by shares | Dissolved |
| TECHWIN COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TEENS COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TEEPLUS COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TELE-AGE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TELE-AGE COMMUNICATIONS INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| TELEMAX COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TELEMETRO COMMUNICATIONS (H.K.) LIMITED | Private company limited by shares | Live |
| ADVANCED TELEPHONE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TELEPOWER COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TELEROUTE COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| Televoice Communications HK Limited | Private company limited by shares | Dissolved |
| TELEWAY COMMUNICATIONS LIMITED | Private company limited by shares | Live |
| TELE-WAY COMMUNICATIONS INTERNATIONAL CO. LIMITED | Private company limited by shares | Dissolved |
| TELEWAY COMMUNICATIONS INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| TELEWIDE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TELHOPE COMMUNICATIONS LIMITED | Private company limited by shares | Dissolved |
| TELMAX COMMUNICATIONS CORPORATION (H.K.) LIMITED | Private company limited by shares | Dissolved |
| TELNEXT COMMUNICATIONS HK LIMITED | Private company limited by shares | Dissolved |
| Telox Communications Co., Limited | Private company limited by shares | Live |