| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| DEWHURST GROUP PLC | 00160314 | 08/06/2021 | Silver |
| GLAZIERS HALL LIMITED | 01217192 | 28/04/2023 | Gold |
| JUDGES SCIENTIFIC PLC | 04597315 | 01/06/2018 | Gold |
| SCIENTIFIC INSTRUMENT MAKERS HALL LIMITED | 01302882 | 28/02/2022 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AAVID THERMALLOY LIMITED | 00919820 | 08/07/1993 | 26/04/1996 | Dissolved |
| Aavid Thermalloy International Ltd | 01585115 | 01/07/1993 | 26/04/1996 | Dissolved |
| EX-UTAH LIMITED | 00773789 | 07/05/1996 | 08/05/1998 | Dissolved |
| Exneptune Ltd | 00690592 | 07/05/1996 | 08/05/1998 | Dissolved |
| GRACECHURCH UTG NO. 318 LIMITED | 03807921 | 03/12/2004 | 10/02/2006 | Dissolved |
| IBEX INNOVATIONS LTD | 07208355 | 03/10/2018 | 12/06/2023 | Amber |
| MOLECULAR WAREHOUSE LTD. | 09491490 | 15/02/2017 | 18/05/2018 | Dissolved |
| NEEPSEND LIMITED | 00166367 | 18/03/1999 | 07/11/1999 | Not Trading |
| OXFORD INSTRUMENTS HOLDINGS EUROPE LIMITED | 06800561 | 23/01/2009 | 01/07/2015 | Silver |
| OXFORD INSTRUMENTS INDUSTRIAL PRODUCTS HOLDINGS LIMITED | 04068014 | 25/09/2000 | 01/07/2015 | Silver |
| OXFORD INSTRUMENTS INDUSTRIAL PRODUCTS LIMITED | 01044063 | 15/05/2017 | 30/04/2018 | Bronze |
| OXFORD INSTRUMENTS MOLECULAR BIOTOOLS LIMITED | 05004981 | 06/04/2009 | 04/01/2011 | Not Trading |
| OXFORD INSTRUMENTS NANOTECHNOLOGY TOOLS LIMITED | 00704320 | 02/04/2015 | 30/04/2018 | Silver |
| OXFORD INSTRUMENTS OVERSEAS HOLDINGS 2008 LIMITED | 06535207 | 20/03/2008 | 01/07/2015 | Bronze |
| OXFORD INSTRUMENTS OVERSEAS HOLDINGS LIMITED | 03302442 | 23/10/2007 | 01/07/2015 | Bronze |
| OXFORD INSTRUMENTS PLASMA TECHNOLOGY LIMITED | 01581072 | 01/04/2000 | 06/02/2006 | Dissolved |
| OXFORD INSTRUMENTS PLC | 00775598 | 22/11/2005 | 10/09/2013 | Gold |
| OXFORD INSTRUMENTS UK 2013 LIMITED | 08384685 | 12/03/2013 | 01/07/2015 | Bronze |
| PHASE FOCUS LIMITED | 05856137 | 06/11/2013 | 22/03/2019 | Amber |
| SCANDURA LIMITED | 03008159 | 17/06/1998 | 07/11/1999 | Bronze |
| TOOLFIT TRADING LTD | 02903267 | 04/01/1999 | 07/11/1999 | Bronze |
| UNITED (MINSTER) LIMITED | 01170118 | 17/06/1998 | 04/01/1999 | One Red Flag |
| United (Bacup) Ltd | 02903268 | 17/06/1998 | 07/11/1999 | Dissolved |
| United (Wycombe) Ltd | 02903270 | 17/06/1998 | 07/11/1999 | Dissolved |