| Company | Timeline | Status | |
| Building Improvement Bureau Limited Secretary • Director | 12 Nov 1993←31 Years→Current | Active | |
| Building Improvement Bureau Limited Director • Architect | 12 Nov 1993←31 Years→Current | Active | |
| Building Improvement Bureau Limited Director • Architect | 12 Nov 1993←30 Years→1 Apr 2024 | Active | |
| Building Improvement Bureau Limited Secretary • Director | 12 Nov 1993←31 Years→1 Sep 2025 | Active | |
