| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Acer Butler & Chappell Ltd | 01859690 | 02/11/2005 | Dissolved |
| Acer Icf Ltd | 02534052 | 02/11/2005 | Dissolved |
| Acer Services Ltd | 02220702 | 02/11/2005 | Dissolved |
| Altwell Ltd | 01691929 | 02/11/2005 | Dissolved |
| CLARKES OF STILLINGTON LIMITED | 00422447 | 21/10/2002 | Dissolved |
| Engineering Geology Ltd | 00960681 | 02/11/2005 | Dissolved |
| G.M.F. (Developments) Ltd | 01367895 | 21/10/2002 | Dissolved |
| G.M.F. (Machinery) Ltd | 01045935 | 21/10/2002 | Dissolved |
| G.M.F. (Metalforming) Ltd | 01164820 | 21/10/2002 | Dissolved |
| Gmf (Investments) Ltd | 01164207 | 21/10/2002 | Dissolved |
| HYDER CONSULTING OVERSEAS LIMITED | 02690216 | 02/11/2005 | Dissolved |
| Hcl(No.1) Ltd | 02162463 | 02/11/2005 | Dissolved |
| Hyder Engineering Ltd | 02452906 | 02/11/2005 | Dissolved |
| James E Robertson & Sons Ltd | SC041395 | 21/10/2002 | Dissolved |
| Maple Processes Ltd | 02562121 | 02/11/2005 | Dissolved |
| Spartan Redheugh Holdings Ltd | 01781596 | 21/10/2002 | Dissolved |
| Spartan Redheugh Trading Ltd | 01888533 | 21/10/2002 | Dissolved |
| THOMAS SHELLFISH LIMITED | 04751727 | 06/09/2011 | Dissolved |
| Tecnecon Ltd | 01868909 | 02/11/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ACER JOHN TAYLOR LIMITED | 01348874 | 02/11/2005 | 10/12/2008 | Dissolved |
| ACER PARTNERSHIPS LIMITED | 02561362 | 02/11/2005 | 10/12/2008 | Dissolved |
| ACER SIR BRUCE WHITE LIMITED | 02560699 | 02/11/2005 | 10/12/2008 | Dissolved |
| ARCADIS CONSULTING HOLDINGS LIMITED | 04052317 | 10/10/2000 | 29/09/2006 | Silver |
| ARCADIS CONSULTING HOLDINGS LIMITED | 04052317 | 10/10/2000 | 10/12/2008 | Silver |
| HYDER 1 LIMITED | 02480999 | 02/11/2005 | 10/12/2008 | Dissolved |
| HYDER CONSULTING GROUP HOLDINGS LIMITED | 00768087 | 21/10/2002 | 17/11/2005 | Gold |
| HYDER CONSULTING GROUP HOLDINGS LIMITED | 00768087 | 21/10/2002 | 10/12/2008 | Gold |
| HYDER CONSULTING OVERSEAS HOLDINGS LIMITED | 04723408 | 08/04/2003 | 10/12/2008 | Amber |
| SOUILLAC GOLF AND COUNTRY CLUB LIMITED | 07136385 | 05/02/2010 | 13/07/2017 | Gold |