| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Acme Marls Ltd | 02857633 | 20/07/2000 | Dissolved |
| BEEPART LIMITED | 00177682 | 09/08/1991 | Gold |
| Ceramic Holdings Ltd | SC029268 | 17/07/1991 | Dissolved |
| Chapel Fell Ganister Company Limited | 00406028 | 08/08/1991 | Dissolved |
| D.DUDDELL,LIMITED | 00436376 | 08/08/1991 | Dissolved |
| DIAMOND REFRACTORIES LIMITED | SC017585 | 01/03/1995 | Dissolved |
| DYSON GROUP PLC | 00163096 | 12/10/1991 | Silver |
| DYSON INDUSTRIES LIMITED | 01187031 | 09/08/1991 | Bronze |
| DYSON TPM LTD | 03327174 | 29/09/1997 | Strike Off |
| DYTECH CORPORATION LIMITED | 02094988 | 08/08/1991 | Dissolved |
| HI-POR CERAMICS LIMITED | 03472749 | 13/01/1998 | Dissolved |
| HOT D 2002 LTD | 00836777 | 01/05/1997 | One Red Flag |
| HOT H 2002 LTD | 00962291 | 01/05/1997 | Dissolved |
| HOT I 2002 LTD | 02316671 | 01/05/1997 | Dissolved |
| HOT PP 2002 LTD | 00938345 | 01/05/1997 | Dissolved |
| Harris & Pearson,Limited | 00258901 | 08/08/1991 | Dissolved |
| Hot C 2002 Ltd | 00443931 | 01/05/1997 | Dissolved |
| Hot F 2002 Ltd | 01319449 | 01/05/1997 | Dissolved |
| Hot Z 2002 Ltd | 01600380 | 01/05/1997 | Dissolved |
| INTELPROP LIMITED | 03473033 | 23/01/1998 | Dissolved |
| J & J DYSON LIMITED | 03326984 | 18/04/1997 | Dissolved |
| JOHN KNOWLES & CO (WOODEN BOX) LIMITED | 00096707 | 09/08/1991 | Dissolved |
| John Stevens (Stourbridge) Limited | 00304962 | 08/08/1991 | Dissolved |
| M & G Tankers Ltd | 01412355 | 09/08/1991 | Dissolved |
| Manor Refractories Ltd | 02175953 | 03/03/2000 | Dissolved |
| Mobberley & Perry Ltd | 00095076 | 08/08/1991 | Dissolved |
| PICKFORD,HOLLAND & CO.LIMITED | 00128414 | 09/08/1991 | Silver |
| Price-Pearson Holdings Ltd | 00128100 | 08/08/1991 | Dissolved |
| Refractory Clays Limited | 00444656 | 09/08/1991 | Dissolved |
| Refractory Minerals Limited | 00154410 | 08/08/1991 | Dissolved |
| Silica Products Limited | 00158724 | 08/08/1991 | Dissolved |
| Spheridyne Limited | 02705557 | 04/01/1993 | Dissolved |
| The Yorkshire Testing Works,Limited | 00111463 | 09/08/1991 | Dissolved |
| Timmis & Co.,Limited | 00197359 | 08/08/1991 | Dissolved |
| Watermeet Ltd | 03112715 | 11/10/1995 | Dissolved |
| Webster & Co (Sheffield) Ltd | 00180689 | 08/08/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Glass Contact Ltd | 01507371 | 16/04/1992 | 21/01/1994 | Dissolved |
| IMCO (62000) LIMITED | 03905626 | 28/02/2000 | 31/10/2011 | Amber |
| RESOURCE INTERNATIONAL LIMITED | 02372056 | 25/10/1991 | 16/04/1999 | Gold |
| SAFFIL LIMITED | 03646114 | 22/04/1999 | 31/10/2011 | Bronze |
| UNIFRAX EMISSION CONTROL EUROPE LTD | 01978805 | 03/03/2000 | 31/10/2011 | One Red Flag |