| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BABTIE SHAW & MORTON LIMITED | SC142020 | 30/11/2016 | Dissolved |
| BURDEROP INVESTMENTS LIMITED | 02485284 | 03/06/2019 | Dissolved |
| CROUCH HOGG WATERMAN LIMITED | SC136186 | 03/06/2019 | Dissolved |
| HALCROW RAIL APPROVALS LIMITED | 05079753 | 03/06/2019 | Dissolved |
| HALCROW STAFF AND SERVICES | 01193727 | 03/06/2019 | Dissolved |
| HALCROW WATER SERVICES LIMITED | 03055857 | 03/06/2019 | Dissolved |
| JACOBS EUROPEAN HOLDINGS LIMITED | 01331542 | 30/11/2016 | Dissolved |
| LINDSEY ENGINEERING SERVICES LIMITED | 05292423 | 30/11/2016 | Dissolved |
| PARTNERS FOR INFRASTRUCTURE LIMITED | 01331748 | 30/11/2016 | Strike Off |
| SULA SYSTEMS LIMITED | 02624519 | 05/09/2018 | Dissolved |
| WESTMINSTER AND EARLEY SERVICES LIMITED | 00500510 | 30/11/2016 | Dissolved |
| YOLLES PARTNERSHIP LIMITED | 02333623 | 03/06/2019 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AMEC FOSTER WHEELER ENERGY LIMITED | 01361134 | 01/11/2006 | 07/04/2008 | One Red Flag |
| AMENTUM E&C LIMITED | 04967961 | 29/06/2018 | 30/11/2020 | Silver |
| ASPINWALL & COMPANY LIMITED | 01946101 | 30/11/2016 | 26/04/2019 | Dissolved |
| CH2M HILL EUROPE LIMITED | 07262036 | 03/06/2019 | 30/11/2020 | One Red Flag |
| CH2M HILL HOLDINGS LIMITED | 12661700 | 11/06/2020 | 30/11/2020 | One Red Flag |
| CH2M HILL ONE LIMITED | 12661623 | 11/06/2020 | 30/11/2020 | Strike Off |
| CH2M HILL SERVICES LIMITED | 04263139 | 03/06/2019 | 30/11/2020 | Dissolved |
| CH2M HILL UNITED KINGDOM | 02533469 | 03/06/2019 | 30/11/2020 | Silver |
| COLIN BUCHANAN AND PARTNERS LIMITED | 01292315 | 30/11/2016 | 26/04/2019 | Dissolved |
| ENVIROS GROUP LIMITED | 04217291 | 30/11/2016 | 26/04/2019 | Strike Off |
| ENVIROS LIMITED | 03072541 | 30/11/2016 | 26/04/2019 | Strike Off |
| ENVIROS MANAGEMENT SERVICES LTD. | 03288557 | 30/11/2016 | 26/04/2019 | Dissolved |
| GIBB HOLDINGS LTD | 02387714 | 30/11/2016 | 30/11/2020 | Dissolved |
| HALCROW (CONSULTING ENGINEERS & ARCHITECTS) LIMITED | 01045458 | 03/06/2019 | 30/11/2020 | Amber |
| HALCROW ASIA LIMITED | 02458827 | 03/06/2019 | 30/11/2020 | One Red Flag |
| HALCROW ASIA PARTNERSHIP LIMITED | 02490667 | 03/06/2019 | 30/11/2020 | One Red Flag |
| HALCROW CANADA LIMITED | 05296410 | 03/06/2019 | 30/11/2020 | Dissolved |
| HALCROW CONSULTING LIMITED | 02326761 | 03/06/2019 | 30/11/2020 | One Red Flag |
| HALCROW GROUP LIMITED | 03415971 | 03/06/2019 | 30/11/2020 | Amber |
| HALCROW HOLDINGS LIMITED | 01674044 | 03/06/2019 | 30/11/2020 | One Red Flag |
| HALCROW INTERNATIONAL LIMITED | 02326765 | 03/06/2019 | 30/11/2020 | Amber |
| HALCROW INTERNATIONAL PARTNERSHIP | 02809680 | 03/06/2019 | 30/11/2020 | Amber |
| HALCROW MANAGEMENT SCIENCES LIMITED | 02770883 | 10/01/2020 | 30/11/2020 | Dissolved |
| JACOBS ENGINEERING UK LIMITED | 02527622 | 27/09/2016 | 30/11/2020 | Dissolved |
| JACOBS EUROPE HOLDCO LIMITED | 09188414 | 30/11/2016 | 30/11/2020 | Bronze |
| JACOBS ONE LIMITED | SC141100 | 30/11/2016 | 30/11/2020 | Silver |
| JACOBS TWO LIMITED | SC580155 | 30/10/2017 | 30/11/2020 | Bronze |
| JACOBS U.K. LIMITED | 02594504 | 18/11/2016 | 30/11/2020 | Bronze |
| JACOBS UK HOLDINGS LIMITED | 04420029 | 27/09/2016 | 30/11/2020 | Gold |
| JACOBSGIBB LTD | 02387707 | 30/11/2016 | 30/11/2020 | Silver |
| L.E.S. CONSTRUCTION LIMITED | 02857923 | 30/11/2016 | 30/11/2020 | Dissolved |
| LEIGHFISHER U.K. LIMITED | 02653755 | 30/11/2016 | 30/11/2020 | Dissolved |
| SIR WILLIAM HALCROW & PARTNERS LIMITED | 01722541 | 03/06/2019 | 30/11/2020 | Dissolved |
| TRANSMARK ASIA LIMITED | 02815214 | 03/06/2019 | 30/11/2020 | One Red Flag |
| WORLEY CONSULTING GROUP LIMITED | 01721409 | 30/11/2016 | 26/04/2019 | Bronze |
| WORLEY E&C INTERNATIONAL LIMITED | 01896128 | 05/09/2018 | 26/04/2019 | Gold |
| WORLEY EUROPE SERVICES LIMITED | 03371550 | 30/11/2016 | 26/04/2019 | Silver |
| WORLEY FIELD SERVICES LIMITED | 00454398 | 05/09/2018 | 26/04/2019 | One Red Flag |