| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ADVANCED TRAFFIC SERVICES LIMITED | 12359243 | 01/02/2022 | One Red Flag |
| AMBERON HOLDINGS LIMITED | 08839178 | 01/02/2022 | Dissolved |
| AMBERON LIMITED | 15380978 | 02/01/2024 | Amber |
| BARRIER SERVICES LIMITED | 15381134 | 02/01/2024 | Amber |
| CORE HIGHWAYS (BARRIER) LIMITED | 01696393 | 01/02/2022 | Silver |
| CORE HIGHWAYS (PROJECTS) LIMITED | 01664145 | 01/02/2022 | Bronze |
| CORE HIGHWAYS (REGIONS) LIMITED | 04410775 | 01/02/2022 | Silver |
| CORE HIGHWAYS (SIGNS) LIMITED | 06773727 | 01/02/2022 | Bronze |
| CORE HIGHWAYS (SOUTHEAST) LIMITED | 10955408 | 01/02/2022 | One Red Flag |
| CORE HIGHWAYS ACQUISITIONS LIMITED | 11666040 | 01/02/2022 | One Red Flag |
| CORE HIGHWAYS GROUP LIMITED | 11665703 | 01/02/2022 | Bronze |
| FOREST TRAFFIC SERVICES LIMITED | 15381030 | 02/01/2024 | Amber |
| JT & M SIGNS LTD | 15381135 | 02/01/2024 | Amber |
| MLP TRAFFIC LTD | 15381136 | 02/01/2024 | Amber |
| VELOCITY HOLDCO LIMITED | 10867385 | 01/02/2022 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ATKINSRÉALIS RAIL & TRANSIT LIMITED | 03062722 | 01/08/2019 | 31/12/2021 | Silver |
| ATKINSRÉALIS RAIL & TRANSIT UK HOLDINGS LIMITED | 03049042 | 16/08/2019 | 31/12/2021 | Silver |
| RAILWAY INDUSTRY ASSOCIATION | 10036044 | 28/10/2019 | 12/01/2022 | Silver |