| Company | Timeline | Status | |
| Katherine Court Freehold Management Limited Director • Unreported | 22 Mar 2012←13 Years→Current | Active | |
| Ryohei Ishikawa Limited Director • Company Director | 23 May 2008←13 Years→7 Sep 2021 | Dissolved | |
| Kitazono Property Limited Director • Unreported | 12 Mar 2008←17 Years→Current | Active | |
| Ryohei Ishikawa Limited Secretary • Unreported | 30 May 1992←29 Years→7 Sep 2021 | Dissolved | |
