| DG Power System Limited | Private company limited by shares | Live |
| NU POWER SYSTEM CO. LIMITED | Private company limited by shares | Live |
| POWER SYSTEM LIMITED | | Live |
| ASIA GENERAL POWER SYSTEM LIMITED | Private company limited by shares | Dissolved |
| KUBOYOMA ONE POWER SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| Tohil Power System Company Limited | Private company limited by shares | Live |
| POWERTECH SYSTEM LIMITED | Private company limited by shares | Live |
| PRECISION TECHNICOLOR SYSTEM LIMITED | Private company limited by shares | Dissolved |
| PRESENT SYSTEM LIMITED | Private company limited by shares | Dissolved |
| PRIMA-PRO SYSTEM LIMITED | Private company limited by shares | Dissolved |
| JET SYSTEM PRIVATE LIMITED | Private company limited by shares | Dissolved |
| PROACTIVE SYSTEM LIMITED | Private company limited by shares | Live |
| Progressive System Limited | Private company limited by shares | Live |
| SE System Projects Limited | Private company limited by shares | Live |
| WIN SYSTEM PROPERTIES LIMITED | Private company limited by shares | Live |
| PRO-POS System Limited | Private company limited by shares | Live |
| PROTECH System Limited | | Live |
| PROTON SYSTEM LIMITED | Private company limited by shares | Dissolved |
| PURE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Pure System Limited | Private company limited by shares | Live |
| QUANTAWAVE SYSTEM LIMITED | Private company limited by shares | Live |
| Asia Pacific Equity Quotations System Limited | Private company limited by shares | Live |
| RELIANCE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| RE-MARKABLE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| System Rent Limited | Private company limited by shares | Live |
| SUN SYSTEM CAPITAL RESOURCES LIMITED | Private company limited by shares | Live |
| RICH SYSTEM LIMITED | Private company limited by shares | Dissolved |
| RICH SYSTEM LIMITED | Private company limited by shares | Dissolved |
| RICH SYSTEM LIMITED | Private company limited by shares | Dissolved |
| RICH SYSTEM LIMITED | Private company limited by shares | Live |
| RICH SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| RICH SYSTEM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| RICH SYSTEM INVESTMENTS LIMITED | Private company limited by shares | Live |
| ROADHZ SYSTEM LIMITED | Private company limited by shares | Live |
| SENSE SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| K'S SYSTEM SERVICE LIMITED | Private company limited by shares | Dissolved |
| BMC Service System Limited | Private company limited by shares | Live |
| SYSTEM SERVICE LIMITED | Private company limited by shares | Live |
| I System Service Company Limited | Private company limited by shares | Live |
| SH System Service Company Limited | | Live |
| SYSTEM SHIPPING COMPANY LIMITED | Private company limited by shares | Dissolved |
| SYSTEM SHIPPING LIMITED | Private company limited by shares | Dissolved |
| SINOTEL SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SKYNET SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Smart One System Limited | Private company limited by shares | Live |
| SMART SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM SMART LIMITED | Private company limited by shares | Live |
| SMARTCOM SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SMARTHOME SYSTEM LIMITED | Private company limited by shares | Live |
| SYSTEM AND SOFTWARE LIMITED | Private company limited by shares | Dissolved |
| Top Solar System Limited | Private company limited by shares | Dissolved |
| System Solar Limited | Private company limited by shares | Dissolved |
| solar system number one Limited | Private company limited by shares | Live |
| SYSTEM SOLUTION LIMITED | Private company limited by shares | Dissolved |
| New Fly System Solution Company Limited | Private company limited by shares | Live |
| SA System Solution Limited | Private company limited by shares | Live |
| Forcewide Network System Solution Limited | Private company limited by shares | Dissolved |
| SYSTEM SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| NAC System Solutions Limited | Private company limited by shares | Live |
| System Pro AI Solutions Limited | Private company limited by shares | Live |
| SOUTH SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SOUTH SYSTEM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SPECIAL SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SPORTS SYSTEM LIMITED | | Live |
| Standard System Limited | | Live |
| HK STARS SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SUCCESS SYSTEM LIMITED | Private company limited by shares | Live |
| SUCCESS SYSTEM ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| SUCCESS SYSTEM INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| SUNLIGHT SYSTEM INTEGRATION LIMITED | Private company limited by shares | Dissolved |
| SUNRISE SYSTEM COMPANY LIMITED | Private company limited by shares | Live |
| SUPERB SYSTEM LIMITED | | Live |
| B & L SYSTEM SUPPLY LIMITED | Private company limited by shares | Dissolved |
| TACLYGON SYSTEM LIMITED | Private company limited by shares | Live |
| E TACTIC SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TEAMAX SYSTEM LIMITED | Private company limited by shares | Live |
| TECHBASE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| SYSTEM TECHNIK LIMITED | Private company limited by shares | Live |
| BC TECHNIWARE SYSTEM LIMITED | Private company limited by shares | Dissolved |
| YIKANG HEATING SYSTEM TECHNOLOGY LIMITED | | Live |
| TECH-PRO SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Tech-Trans System Limited | Private company limited by shares | Live |
| TECH-TRANS SYSTEM LIMITED | | Live |
| Tectonic System Limited | Private company limited by shares | Live |
| TERMITE BAITING SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TerraMaster System Limited | Private company limited by shares | Live |
| TexAir System Limited | | Live |
| THEMOEDGE SYSTEM LIMITED | Private company limited by shares | Live |
| TIANKONG SYSTEM LIMITED | Private company limited by shares | Live |
| TICTAS SYSTEM AUTOMATION LIMITED | Private company limited by shares | Live |
| TIME SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TIMES SYSTEM COMPANY LIMITED | Private company limited by shares | Dissolved |
| HONG KONG TONGDA NETWORK SYSTEM LIMITED | Private company limited by shares | Dissolved |
| TRADE AIR SYSTEM LIMITED | Private company limited by shares | Live |
| SYSTEM TRADE LIMITED | Private company limited by shares | Dissolved |
| TRANSPORT SYSTEM LIMITED | Private company limited by shares | Live |
| EUROPEAN TRANSPORT SYSTEM LIMITED | Private company limited by shares | Dissolved |
| EUROSTAR TRANSPORT SYSTEM LIMITED | Private company limited by shares | Dissolved |
| Transport System Solutions Limited | Private company limited by shares | Live |
| TRIBUTA SYSTEM LIMITED | Private company limited by shares | Live |