| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Avidacre Limited | 02634171 | 01/10/2001 | Dissolved |
| Bookseller Publications Limited | 02427859 | 01/10/2001 | Dissolved |
| Booktrack Ltd | 02778627 | 01/10/2001 | Dissolved |
| First Edition E D I Services Ltd | 02682291 | 16/07/2002 | Dissolved |
| J. Whitaker & Sons Ltd | 01697041 | 01/10/2001 | Dissolved |
| JONATHAN NOWELL & COMPANY LTD | 09970356 | 26/01/2016 | Gold |
| Nielsen Bookdata Ltd | 01988476 | 16/07/2002 | Dissolved |
| Sporting Handbooks Limited | 00655027 | 01/10/2001 | Dissolved |
| THE BOOK TRADE CHARITY (BTBS) | 06725178 | 18/09/2017 | Silver |
| Teleordering Ltd | 01019181 | 01/10/2001 | Dissolved |
| The Standard Book Numbering Agency Ltd | 00881964 | 01/10/2001 | Dissolved |
| Whitaker Bibliographic Services Ltd | 00958044 | 01/10/2001 | Dissolved |
| Whitaker Business Publishing Ltd | 03637862 | 01/10/2001 | Dissolved |
| Whitaker Information Services Ltd | 03392223 | 01/10/2001 | Dissolved |
| Whitaker Limited | 02828579 | 01/10/2001 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BOOK INDUSTRY COMMUNICATION LIMITED | 02589185 | 14/11/2006 | 15/10/2021 | Silver |
| CLAYS LTD. | 00342498 | 11/09/2018 | 31/12/2023 | Gold |
| Elan European Publishing Ltd | 03035550 | 02/07/1998 | 16/03/2000 | Dissolved |
| NIELSEN BOOK SERVICES LIMITED | 00070437 | 01/10/2001 | 19/05/2015 | Silver |
| THE INTERNATIONAL ISBN AGENCY LIMITED | 05332288 | 10/09/2013 | 07/01/2016 | Silver |
| THE INTERNATIONAL ISTC AGENCY LIMITED | 06674385 | 09/10/2013 | 10/04/2014 | Dissolved |
| Whitaker Business Publishing Ltd | 03637862 | 08/01/1999 | 15/08/2000 | Dissolved |