| SENTRY LIMITED | Private company limited by shares | Dissolved |
| Sentry 2011 Limited | Private company limited by shares | Live |
| SENTRY (ASIA) LIMITED | Private company limited by shares | Dissolved |
| SENTRY BIOTECHNIK LIMITED | Private company limited by shares | Dissolved |
| SENTRY CAPITAL LIMITED | Private company limited by shares | Dissolved |
| SENTRY DOOR SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| GLORY SENTRY LIMITED | Private company limited by shares | Live |
| SENTRY GROUP LIMITED | Private company limited by shares | Live |
| ASIA SENTRY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SHEEN SENTRY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SOUTH SENTRY INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SENTRY PARKING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SENTRY TRADING LIMITED | Private company limited by shares | Dissolved |
| SENTRYi H.K. Limited | Private company limited by shares | Dissolved |
| Sentrylabs Limited | | Live |
| SENTRY-TECH LIMITED | Private company limited by shares | Dissolved |