| Company | Timeline | Status | |
| Marlborough Rare Books Limited Director • Antiquarian Bookseller | 31 Jan 2025←10 Months→Current | Active | |
| Marlborough & Pickering Limited Director • Bookseller | 27 Aug 2021←4 Years→Current | Active | |
| Pickering & Chatto Limited Director • Bookseller | 29 Jan 2016←9 Years→Current | Active | |
| Antiquarian Booksellers Association (International) Director • Bookseller | 25 Mar 2006←4 Years→21 Apr 2010 | Active | |
| St Clement's Court Books Ltd Director • Company Director | 12 Dec 2005←20 Years→Current | Liquidation | |
| William Pickering Limited Director • Company Director | 10 Dec 1996←29 Years→Current | Active | |
