| Company | Timeline | Status | |
| Space Time Publications Limited Director • Unreported | 30 Jul 2025←3 Months→Current | Active | |
| Stephen Hawking Limited Director • Unreported | 14 Jun 2018←7 Years→Current | Active | |
| Cosmic Horizons Limited Director • Author | 21 Dec 2013←9 Years→1 Feb 2023 | Dissolved | |
| Space Time Publications Limited Director • Author | 14 Apr 1997←27 Years→11 Aug 2024 | Active | |
