| Company | Timeline | Status | |
H. Raper Limited Director • Director | 8 Jun 1999←21 Years→13 Oct 2020 | Dissolved | |
Whitcrew Management (UK) Limited Director • Director | 17 Apr 1998←17 Years→23 Feb 2016 | Dissolved | |
| John H. Whitaker (Management) Limited Director • Managing Director | 10 Jul 1991←34 Years→Current | Active | |
| John H. Whitaker (Properties) Limited Director • Managing Director | 10 Jul 1991←34 Years→Current | Active | |
| John H.Whitaker (Tankers) Limited Director • Managing Director | 10 Jul 1991←34 Years→Current | Active | |
John Harker,Limited Director • Managing Director | 10 Jul 1991←29 Years→13 Oct 2020 | Dissolved | |
Yorkshire Dry Dock Company,Limited(The) Director • Director | 13 Jun 1991←29 Years→27 Oct 2020 | Dissolved | |
| John H. Whitaker (Holdings) Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Liquidation | |
