| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ANDIDRAIN LIMITED | 06741796 | 29/07/2022 | Bronze |
| DENHOLM ENERGY SERVICES LIMITED | 09186034 | 05/05/2017 | Bronze |
| DENHOLM ENGINEERING LIMITED | SC411270 | 20/09/2019 | Not Trading |
| DENHOLM ENVIRONMENTAL LIMITED | SC298532 | 24/04/2017 | Silver |
| DENHOLM MACNAMEE LIMITED | SC709210 | 10/09/2021 | Not Trading |
| DENHOLM OILFIELD SERVICES (AZERBAIJAN) LIMITED | SC300221 | 30/04/2018 | Silver |
| DENHOLM OILFIELD SERVICES (KAZAKHSTAN) LIMITED | 01224704 | 20/09/2019 | Silver |
| DENHOLM OILFIELD SERVICES GROUP LIMITED | SC257425 | 20/09/2019 | Dissolved |
| DENHOLM VALVECARE (HOLDINGS) LIMITED | SC300216 | 25/06/2018 | Dissolved |
| DENHOLM VALVECARE LIMITED | 02468254 | 24/04/2017 | Dissolved |
| HAZCO ENVIRONMENTAL LIMITED | SC709211 | 10/09/2021 | Not Trading |
| INCHYRA HAZCO LIMITED | SC201890 | 10/03/2020 | Dissolved |
| INDUSTRIAL AIR POWER LIMITED | 07884093 | 20/09/2019 | Not Trading |
| KSW ENGINEERING LIMITED | SC077744 | 03/10/2019 | Bronze |
| PDL DENHOLM VALVECARE LIMITED | SC213871 | 25/09/2019 | Dissolved |
| PETRASCO SERVICES LIMITED | SC280844 | 25/04/2017 | Bronze |
| RELAY ENGINEERING LIMITED | 02431701 | 04/05/2017 | Amber |
| RELAY INTERNATIONAL GROUP LIMITED | 14764556 | 28/03/2023 | Silver |
| TANKTECH SERVICES LIMITED | 01978604 | 24/02/2020 | Dissolved |
| TURNER & HICKMAN LIMITED | SC318140 | 24/05/2019 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| SDL NOBEL LIMITED | 04041079 | 01/05/2017 | 04/08/2023 | Silver |