| CHINA UNITED SECURITY LIMITED | Private company limited by shares | Live |
| UNITED SECURITY CORP., LIMITED | Private company limited by shares | Dissolved |
| UNITED SECURITY SOLUTIONS LIMITED | Private company limited by shares | Live |
| United Security Technologies Limited | Private company limited by shares | Live |
| VELEY SECURITY LIMITED | Private company limited by shares | Live |
| VIACAM SECURITY SYSTEMS LIMITED | Private company limited by shares | Live |
| VIDEO SECURITY LIMITED | Private company limited by shares | Live |
| VIPRE SECURITY TRANSPORTATION LIMITED | Private company limited by shares | Dissolved |
| Virtualization Security Limited | Private company limited by shares | Live |
| VIVO SECURITY & AUTOMATION LIMITED | Private company limited by shares | Live |
| Walok Security System Company Limited | Private company limited by shares | Live |
| WANJUN SECURITY LIMITED | Private company limited by shares | Live |
| WELLPOINT SECURITY & TELECOMMUNICATIONS LIMITED | Private company limited by shares | Live |
| WESTLINE SECURITY LIMITED | Private company limited by shares | Dissolved |
| WHIRLWIND SECURITY LIMITED | Private company limited by shares | Live |
| WIDELY SECURITY COMPANY LIMITED | Private company limited by shares | Dissolved |
| WING ON SECURITY COMPANY LIMITED | Private company limited by shares | Live |
| WISE SECURITY LIMITED | Private company limited by shares | Live |
| WONG'S BROTHERS SECURITY COMPANY LIMITED | Private company limited by shares | Dissolved |
| WORK SECURITY ELECTRONIC ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| WUFU SMART DIGITAL SECURITY LIMITED | Private company limited by shares | Live |
| XENA SECURITY LIMITED | Private company limited by shares | Live |
| SHENZHEN XINTAI SECURITY TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| XTREM SECURITY LIMITED | Private company limited by shares | Live |
| XTREME SECURITY LIMITED | Private company limited by shares | Live |
| YING YUI SECURITY SERVICE COMPANY LIMITED | Private company limited by shares | Live |
| YinZheng Security Limited | | Live |
| Zeppa Security & Engineering Limited | Private company limited by shares | Live |
| ZHONGWIN SECURITY LIMITED | Private company limited by shares | Live |
| ZKTECO AND HST SECURITY SOLUTION LIMITED | Private company limited by shares | Live |
| RED ZONE SECURITY HK LIMITED | Private company limited by shares | Dissolved |
| LI ZONG SECURITY LIMITED | Private company limited by shares | Live |
| ZONG TUO SECURITY LIMITED | Private company limited by shares | Live |
| SECURITY-COLUMBIAN ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SECURITYPACK CO., LIMITED | Private company limited by shares | Live |
| SECURITYPRO LIMITED | Private company limited by shares | Live |
| SECURIX LIMITED | Private company limited by shares | Live |
| SECURMED LIMITED | Private company limited by shares | Live |
| SecurNtech Consulting Limited | Private company limited by shares | Live |
| Securo Limited | Private company limited by shares | Live |
| Securoseal Limited | Private company limited by shares | Dissolved |
| Securosys HK Limited | Private company limited by shares | Live |
| SECURSTAR LIMITED | Private company limited by shares | Live |
| SecurSys Limited | Private company limited by shares | Live |
| SECUSTAR INTERNATIONAL (HK) LIMITED | Private company limited by shares | Live |
| SECUSYS SOLUTIONS LIMITED | | Live |
| SECUTECH (ASIA) LIMITED | Private company limited by shares | Dissolved |
| SECUTECH CHINA LIMITED | Private company limited by shares | Live |
| Secutech Co., Limited | Private company limited by shares | Live |
| DIGITAL SECUTECH LIMITED | Private company limited by shares | Dissolved |
| FSCAMOR SECUTECH LIMITED | Private company limited by shares | Dissolved |
| Sunway Secutech Co., Limited | Private company limited by shares | Live |
| SECUTEL CO., LIMITED | Private company limited by shares | Live |
| SECUTOOL LIMITED | Private company limited by shares | Dissolved |
| SECUTOR COMPANY LIMITED | Private company limited by shares | Dissolved |
| SECUTRADE LIMITED | Private company limited by shares | Live |
| SECUTRONIX COMPANY LIMITED | Private company limited by shares | Dissolved |
| SECUV TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SECUVIC LIMITED | Private company limited by shares | Live |
| Secuwell Electronics Limited | Private company limited by shares | Live |
| SECVISION LIMITED | | Live |
| SECWIN SECRETARIAL LIMITED | Private company limited by shares | Live |
| HK SECXPEN TECHNOLOGY LIMITED | Private company limited by shares | Live |