| AONE TEST PROBES (HONG KONG) LIMITED | Private company limited by shares | Live |
| HONG KONG CARRKA TEST TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| HONG KONG SOUTHEASTERN TEST TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| HONGKONG GUOTONG TEST EQUIPMENT CO., LIMITED | Private company limited by shares | Live |
| INNOVATION TEST (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| SEMI TEST (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| BBK TEST SYSTEMS HONGKONG CO., LIMITED | Private company limited by shares | Live |
| Hongkong Crystal Test Consulting Co., Limited | Private company limited by shares | Live |
| HONGKONG HEART TEST LABORATORY LIMITED | Private company limited by shares | Live |
| HongKong Radiation Test Co., Limited | Private company limited by shares | Live |
| Hongkong ATA Test Services Co., Limited | Private company limited by shares | Live |
| TEST (HONGKONG) PRECISION TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| HOPESTAR TEST LAB LIMITED | Private company limited by shares | Live |
| Hong Kong IQ Test Institute Limited | Private company limited by shares | Live |
| BUILD & TEST INSTRUMENT (INTERNATIONAL) LIMITED | Private company limited by shares | Dissolved |
| BUILD & TEST INSTRUMENT (CHINA) LIMITED | Private company limited by shares | Live |
| TEST INSTRUMENT CO., LIMITED | Private company limited by shares | Live |
| Global Test Instrument Limited | Private company limited by shares | Live |
| HUALONG TEST INSTRUMENTS CO., LIMITED | Private company limited by shares | Live |
| TAIWAN SARTEC TEST INSTRUMENTS LIMITED | | Live |
| Test Up International Limited | Private company limited by shares | Dissolved |
| AMS INTERNATIONAL TEST LIMITED | Private company limited by shares | Live |
| ICT INTERNATIONAL CIRCUIT TEST COMPANY LIMITED | Private company limited by shares | Dissolved |
| First Test International Co., Limited | Private company limited by shares | Live |
| TEST INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| TEST RITE INTERNATIONAL INVESTMENT CO., LIMITED | Private company limited by shares | Dissolved |
| JADASON TEST LIMITED | Private company limited by shares | Live |
| Kongter Test & Measurement Co., Limited | Private company limited by shares | Live |
| Reliability & Endurance Test Laboratory Limited | Private company limited by shares | Dissolved |
| ICHIP TEST LABORATORY LIMITED | | Live |
| TEST LINK LIMITED | Private company limited by shares | Dissolved |
| Test and Measurement, Limited | Private company limited by shares | Live |
| National Matriculation Test Research Center Company Limited | Private company limited by shares | Live |
| NATIONAL TEST SYSTEM LIMITED | Private company limited by shares | Live |
| TEST ONLINE COMPANY LIMITED | Private company limited by shares | Dissolved |
| GLOBE PERFORMANCE TEST CO., LIMITED | | Live |
| Ningbo ANE Safety & Performance Test Company Limited | Private company limited by shares | Live |
| TEST GLOBAL PRODUCTION LIMITED | Private company limited by shares | Dissolved |
| TEST RITE RETAILING LIMITED | Private company limited by shares | Live |
| RUHR TEST COMPANY LIMITED | Private company limited by shares | Live |
| Loyal Test Science and Technology International Company Limited | Private company limited by shares | Live |
| UNIT TEST SCIENTIFIC COMPANY LIMITED | Private company limited by shares | Live |
| SCREEN TEST TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Dissolved |
| ADVANCED TEST SERVICES INTERNATIONAL LIMITED | Private company limited by shares | Live |
| STS Test Services Co., Limited | Private company limited by shares | Live |
| EAC TEST SERVICES CO., LIMITED | Private company limited by shares | Live |
| General Standard Test Services Limited | Private company limited by shares | Live |
| TOTAL TEST SERVICES LIMITED | Private company limited by shares | Dissolved |
| UNITED TEST SERVICES HK LIMITED | Private company limited by shares | Dissolved |
| Shanghai Test Prep Limited | Private company limited by shares | Live |
| Signal Test HK Limited | Private company limited by shares | Live |
| SIMTEC TEST TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SIRA TEST AND CERTIFICATION LIMITED | Private company limited by shares | Live |
| KK ENGINEERING FACILITY SURVEYORS AND TEST HOUSE LIMITED | | Live |
| J & P SURVEYORS AND TEST HOUSE LIMITED | Private company limited by shares | Live |
| T & S Surveyors And Test House Limited | | Live |
| Radiance Surveyors and Test House Limited | Private company limited by shares | Live |
| EMC TEST SYSTEM LIMITED | Private company limited by shares | Dissolved |
| HK VEHICLE TEST SYSTEM LIMITED | Private company limited by shares | Live |
| TAIWAN OPTOELECTRONIC TEST RESEARCH INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| TEST & TASTE LAB LIMITED | Private company limited by shares | Live |
| Test Our Tech Limited | Private company limited by shares | Live |
| TEST TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| E&S TEST TECHNOLOGY LIMITED | Private company limited by shares | Live |
| BUILD & TEST TECHNOLOGY LIMITED | Private company limited by shares | Live |
| TEST DRIVE GENESIS TECHNOLOGY LIMITED | Private company limited by shares | Live |
| TEST ELECTRONIC TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SAFETY TEST TECHNOLOGY (HONGKONG) CO., LIMITED | Private company limited by shares | Dissolved |
| TEST STAR TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| TRUE TEST LAB TECHNOLOGY CO., LIMITED | | Live |
| ROHS AND WEEE TEST TECHNOLOGY COMPANY LIMITED | Private company limited by shares | Dissolved |
| THINGS TEST (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| TISSUE FLOW TEST LIMITED | Private company limited by shares | Live |
| VELECTRONIA TEST SYSTEM (FAR EAST) LIMITED | Private company limited by shares | Dissolved |
| T M WINDOW TEST CO., LIMITED | Private company limited by shares | Live |
| TESTA LIMITED | Private company limited by shares | Dissolved |
| TESTA DURA LIMITED | Private company limited by shares | Live |
| Testa Allied Technology Group Co., Limited | Private company limited by shares | Live |
| Testa Industrial Co., Limited | Private company limited by shares | Live |
| TESTA MANAGEMENT LIMITED | Private company limited by shares | Dissolved |
| TESTALE LIMITED | Private company limited by shares | Dissolved |
| TestBird HK Limited | Private company limited by shares | Live |
| TESTBUY COMPANY LIMITED | Private company limited by shares | Live |
| TESTCO LIMITED | Private company limited by shares | Live |
| TESTCOMBE LIMITED | Private company limited by shares | Dissolved |
| HK LI BANG TEST-CONTROL EQUIPMENT INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ROTURK TEST&CONTROL EQUIPMENT LIMITED | Private company limited by shares | Dissolved |
| tested Limited | Private company limited by shares | Live |
| TESTEL GROUP LIMITED | Private company limited by shares | Dissolved |
| TOU YAN TESTEQUIPMENT HONGKONG CO., LIMITED | Private company limited by shares | Live |
| ZHONGZHU TESTEQUIPMENT (HK) CO., LIMITED | Private company limited by shares | Live |
| TESTER4FREE.COM LIMITED | Private company limited by shares | Live Commenced dormancy on 13-Mar-2015 |
| TestFromHomeHK Limited | Private company limited by shares | Live |
| Testhold Holding Limited | Private company limited by shares | Live |
| TesTime Limited | Private company limited by shares | Live |
| T M TESTING COMPANY LIMITED | Private company limited by shares | Live |
| TCL TESTING LIMITED | Private company limited by shares | Live |
| API LAB TESTING LIMITED | Private company limited by shares | Live |
| SgT Lab Testing Limited | Private company limited by shares | Live |
| TE TESTING LIMITED | Private company limited by shares | Live |