| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| TUFTON MANAGEMENT COMPANY LIMITED | 09173322 | 14/11/2019 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| INEOS E&P (UK) LIMITED | 04376184 | 29/09/2017 | 15/11/2018 | Silver |
| INEOS ENTERPRISES GROUP LIMITED | 04687714 | 01/01/2020 | 01/03/2021 | Silver |
| INEOS TECHNOLOGIES (HOLDINGS) LIMITED | 06716202 | 01/01/2020 | 01/03/2021 | Gold |
| INEOS TECHNOLOGIES (VINYLS) LIMITED | 07085219 | 01/01/2020 | 01/03/2021 | Silver |
| INEOS UPSTREAM LIMITED | 09121775 | 10/01/2017 | 18/02/2020 | Amber |
| INEOS UPSTREAM SERVICES LIMITED | 09485976 | 10/01/2017 | 18/02/2020 | Bronze |
| INEOS VINYLS UK LTD | 00547640 | 01/01/2020 | 01/03/2021 | Dissolved |
| INOVYN CHLORVINYLS HOLDINGS LIMITED | 07085121 | 01/01/2020 | 01/03/2021 | Amber |
| INOVYN CHLORVINYLS LIMITED | 04068812 | 01/01/2020 | 01/03/2021 | Gold |
| INOVYN ENERGY LIMITED | 02076043 | 01/01/2020 | 01/03/2021 | Silver |
| INOVYN ENTERPRISES LIMITED | 04651437 | 01/01/2020 | 01/03/2021 | Amber |
| INOVYN EUROPE LIMITED | 10398354 | 01/01/2020 | 01/03/2021 | Bronze |
| INOVYN HOLDINGS LIMITED | 10204869 | 01/01/2020 | 01/03/2021 | Dissolved |
| INOVYN NEWCO 2 LIMITED | 04772918 | 01/01/2020 | 01/03/2021 | Gold |
| INOVYN NEWTON AYCLIFFE LIMITED | 01631120 | 01/01/2020 | 01/03/2021 | Silver |
| INOVYN SALES INTERNATIONAL LIMITED | 03934724 | 01/01/2020 | 01/03/2021 | Dissolved |
| INOVYN SERVICES LIMITED | 04797474 | 01/01/2020 | 01/03/2021 | Amber |
| KERLING NEWCO 1 LIMITED | 09613152 | 01/01/2020 | 01/03/2021 | Gold |
| KERLING NEWCO 2 LIMITED | 09613220 | 01/01/2020 | 01/03/2021 | Gold |
| KEUPER GAS STORAGE LIMITED | 08850140 | 01/01/2020 | 01/03/2021 | Amber |
| UK ONSHORE OIL & GAS | 08257978 | 23/02/2017 | 11/04/2018 | Bronze |