| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BIORELIANCE LTD. | SC122851 | 01/03/2023 | Silver |
| BIORELIANCE UK ACQUISITION LIMITED | 06131176 | 01/03/2023 | Dissolved |
| EPICHEM GROUP LIMITED | 02332327 | 01/03/2023 | Gold |
| MERCK HOLDING LTD. | 08531583 | 01/03/2023 | Bronze |
| MERCK INVESTMENTS LIMITED | 04083127 | 01/03/2023 | Not Trading |
| MERCK LIFE SCIENCE UK LIMITED | 00660457 | 01/03/2023 | Silver |
| MERCK LTD | 00916419 | 01/03/2023 | Not Trading |
| MERCK PERFORMANCE MATERIALS LIMITED | 12251750 | 01/03/2023 | Silver |
| MERCK SERONO EUROPE LIMITED | 03038737 | 01/03/2023 | Dissolved |
| MERCK SERONO LIMITED | 00990823 | 01/03/2023 | Gold |
| MILLIPORE (U.K.) LIMITED | 04130249 | 01/03/2023 | Gold |
| SAFC BIOSCIENCES LIMITED | 03195318 | 01/03/2023 | Silver |
| SAFC HITECH LIMITED | 01670306 | 01/03/2023 | Silver |
| SIGMA CHEMICAL COMPANY LIMITED | 00781324 | 01/03/2023 | Not Trading |
| SIGMA-ALDRICH COMPANY LIMITED | 02204655 | 01/03/2023 | Silver |
| SURFACE MATERIALS LTD | 16064266 | 06/11/2024 | Amber |
| VERSUM MATERIALS UK LIMITED | 09868072 | 01/03/2023 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| MERCK BIOSCIENCES LTD | 02154136 | 23/11/2011 | 24/02/2012 | Dissolved |