| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| GRAYTON (HOLDINGS) LIMITED | 04381326 | 31/03/2016 | Dissolved |
| GRAYTON ENGINEERING LIMITED | 02730358 | 31/03/2016 | One Red Flag |
| P J DOUGLAS HOLDINGS LIMITED | 05666899 | 31/03/2016 | Dissolved |
| PJD BUSINESS SERVICES LIMITED | 06479838 | 31/03/2016 | Dissolved |
| PJD ENERGY LIMITED | 06582229 | 31/03/2016 | Dissolved |
| PJD ENVIRONMENTAL LIMITED | 06635513 | 31/03/2016 | Dissolved |
| PJD INDUSTRIAL LIMITED | 06635361 | 31/03/2016 | Dissolved |
| PJD POWER LIMITED | 06945269 | 18/05/2016 | Dissolved |
| SERIF (EUROPE) LIMITED | 02117968 | 08/08/2023 | Silver |
| SERIF GROUP LIMITED | 05041038 | 08/08/2023 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ASHTON LISTER INVESTMENTS LIMITED | 05617735 | 23/04/2021 | 19/07/2022 | Bronze |
| EMMTEC LIMITED | 08589300 | 31/03/2016 | 10/04/2018 | Dissolved |
| HYFIRE WIRELESS FIRE SOLUTIONS LIMITED | 06393298 | 01/04/2022 | 19/07/2022 | Silver |
| KESTREL PLANT LIMITED | 06507846 | 31/03/2016 | 10/04/2018 | Dissolved |
| METER PROVIDA HOLDCO LIMITED | 08720120 | 14/12/2017 | 19/03/2018 | Dissolved |
| METER PROVIDA INVESTMENTS LIMITED | 08720432 | 14/12/2017 | 19/03/2018 | One Red Flag |
| METER PROVIDA LIMITED | 04057886 | 14/12/2017 | 19/03/2018 | Two Red Flags |
| MOBOTEC UK LIMITED | 08775428 | 31/03/2016 | 10/04/2018 | Insolvent |
| NMUK LIMITED | 08026463 | 31/03/2016 | 10/04/2018 | Dissolved |
| PJD GROUP LIMITED | 06895689 | 31/03/2016 | 10/04/2018 | Dissolved |
| PJD MECHANICAL ENGINEERING LIMITED | 01815863 | 31/03/2016 | 04/11/2016 | Silver |
| RAMTECH ELECTRONICS LIMITED | 02538255 | 22/07/2020 | 19/07/2022 | Bronze |
| RAMTECH OVERSEAS LIMITED | 10162495 | 22/07/2020 | 19/07/2022 | Silver |
| REFCOM LININGS LIMITED | 07123412 | 31/03/2016 | 10/04/2018 | Dissolved |
| THE POWER INDUSTRIAL GROUP LIMITED | 07545141 | 31/03/2016 | 10/04/2018 | Dissolved |