| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ACIES CIVIL AND STRUCTURAL LIMITED | 07195701 | 04/05/2017 | Silver |
| ARGUS ENVIRONMENTAL LIMITED | 02769631 | 28/02/2008 | Amber |
| AZERBAIJAN ENVIRONMENT AND TECHNOLOGY CENTRE LIMITED | SC158836 | 11/01/1996 | Amber |
| BUILDING SCIENCES LIMITED | 01992975 | 09/01/2008 | Not Trading |
| DYNAMIC SAMPLING UK LIMITED | 04143018 | 27/04/2016 | One Red Flag |
| ENVIROLAB LIMITED | 04487136 | 16/07/2002 | One Red Flag |
| GEOFILM INTERNATIONAL LIMITED | 04319770 | 08/11/2001 | Dissolved |
| INFORMATION TECHNOLOGISTS LIMITED | SC139749 | 01/01/2007 | Dissolved |
| INFORMATION TECHNOLOGISTS LIMITED | SC139749 | 09/03/1993 | Dissolved |
| KAZAKHSTAN ENVIRONMENT AND TECHNOLOGY CENTRE LIMITED | 04432551 | 07/05/2002 | Dissolved |
| PIPESIGHT INTERNATIONAL LIMITED | 04319768 | 08/11/2001 | Dissolved |
| PS RAIL LIMITED | 04454534 | 27/04/2016 | Dissolved |
| R.W. MANAGEMENT (HOLDINGS) LTD | 03846486 | 11/06/2003 | Dissolved |
| REMEDX LIMITED | 05044531 | 16/02/2004 | Bronze |
| RSK (IRELAND) LIMITED | 05857689 | 26/06/2006 | Amber |
| RSK ADAS LIMITED | 10486936 | 18/11/2016 | Bronze |
| RSK BUSINESS SOLUTIONS HOLDINGS LIMITED | 09997268 | 29/02/2016 | Bronze |
| RSK BUSINESS SOLUTIONS LTD | 06930271 | 10/06/2009 | Bronze |
| RSK CARBON MANAGEMENT LIMITED | 06263095 | 30/05/2007 | Dissolved |
| RSK CARTER ECOLOGICAL LTD | 06138360 | 05/03/2007 | Dissolved |
| RSK CARTERS ECOLOGICAL LTD | 06126847 | 23/02/2007 | Dissolved |
| RSK DRILLING SERVICES LIMITED | 10068093 | 17/03/2016 | Dissolved |
| RSK ENVIRONMENT (EASTERN EUROPE) LIMITED | 05056397 | 26/02/2004 | Dissolved |
| RSK GROUP LIMITED | 03761340 | 28/04/1999 | Amber |
| RSK GROUP TRUSTEES LIMITED | 06858672 | 31/03/2009 | Not Trading |
| RSK INVESTMENTS LIMITED | 04500781 | 01/08/2002 | Amber |
| RSK LAND & DEVELOPMENT ENGINEERING LIMITED | 04723837 | 04/04/2003 | Amber |
| RSK MIDDLE EAST LIMITED | 07158371 | 16/02/2010 | Not Trading |
| RSK ORBITAL LIMITED | 03686187 | 21/12/1998 | Bronze |
| RSK PROJECT SERVICES LIMITED | 02901671 | 11/06/2003 | One Red Flag |
| RSK RADIOLOGICAL LIMITED | 06367880 | 11/09/2007 | One Red Flag |
| RSK REMEDIATION AND DEVELOPMENT LIMITED | 07143991 | 02/02/2010 | Not Trading |
| RSK REMEDIATION LIMITED | 03522284 | 17/11/2004 | Dissolved |
| RSK REMEDIATION LIMITED | 03522284 | 17/11/2004 | Dissolved |
| RSK RENEWABLES LIMITED | 06773430 | 15/12/2008 | Not Trading |
| RSK RESOURCING LIMITED | 06000032 | 15/11/2006 | Dissolved |
| RSK STATS ENVIRONMENT HEALTH AND SAFETY LIMITED | 04639175 | 16/01/2003 | Not Trading |
| RSK STATS GEOCONSULT LIMITED | 02611785 | 13/08/2001 | Amber |
| RSK STATS LIMITED | 02833839 | 24/01/2008 | Dissolved |
| RSK TRAINING LIMITED | 07143956 | 02/02/2010 | Dissolved |
| RSK TURKEY LIMITED | 04666254 | 13/02/2003 | Dissolved |
| RSKW LTD | 06548422 | 29/03/2008 | One Red Flag |
| SKYVISION INTERNATIONAL LIMITED | SC153156 | 29/10/1995 | Amber |
| STRUCTURAL SOILS LIMITED | 00828694 | 28/02/2007 | Bronze |
| SUPA GOLF EUROPE LIMITED | 07028975 | 24/09/2009 | Dissolved |
| SUPA GOLF LIMITED | 07028951 | 24/09/2009 | Dissolved |
| TECHNICAL EDITING SERVICES LIMITED | 02928662 | 02/08/2007 | Dissolved |
| THE NATURAL WAY TO GO LTD | 06755728 | 21/11/2008 | Not Trading |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AZERBAIJAN ENVIRONMENT AND TECHNOLOGY CENTRE LIMITED | SC158836 | 14/01/2003 | 23/06/2009 | Amber |
| ENVIROLAB LIMITED | 04487136 | 14/01/2003 | 04/08/2008 | One Red Flag |
| KAZAKHSTAN ENVIRONMENT AND TECHNOLOGY CENTRE LIMITED | 04432551 | 01/01/2007 | 20/10/2008 | Dissolved |
| KENERA LIMITED | SC163996 | 08/03/1996 | 27/09/2018 | Dissolved |
| M & M COMMUNICATIONS LIMITED | 03534758 | 25/03/1998 | 03/06/2004 | Dissolved |
| R.W. MANAGEMENT (HOLDINGS) LTD | 03846486 | 13/06/2003 | 15/10/2008 | Dissolved |
| REMEDX LIMITED | 05044531 | 16/02/2004 | 01/03/2011 | Bronze |
| RSK (IRELAND) LIMITED | 05857689 | 26/06/2006 | 01/07/2009 | Amber |
| RSK CARBON MANAGEMENT LIMITED | 06263095 | 30/05/2007 | 04/06/2016 | Dissolved |
| RSK CARTER ECOLOGICAL LTD | 06138360 | 05/03/2007 | 01/03/2016 | Dissolved |
| RSK CARTERS ECOLOGICAL LTD | 06126847 | 23/02/2007 | 15/12/2011 | Dissolved |
| RSK ENVIRONMENT (EASTERN EUROPE) LIMITED | 05056397 | 26/02/2004 | 01/03/2011 | Dissolved |
| RSK ENVIRONMENT LIMITED | SC115530 | 14/01/2003 | 19/01/2009 | Silver |
| RSK GROUP LIMITED | 03761340 | 14/01/2003 | 03/12/2007 | Amber |
| RSK INVESTMENTS LIMITED | 04500781 | 14/01/2003 | 30/03/2021 | Amber |
| RSK LAND & DEVELOPMENT ENGINEERING LIMITED | 04723837 | 04/04/2003 | 28/04/2009 | Amber |
| RSK ORBITAL LIMITED | 03686187 | 21/12/1998 | 01/12/1999 | Bronze |
| RSK PROJECT SERVICES LIMITED | 02901671 | 01/04/2006 | 17/07/2009 | One Red Flag |
| RSK RADIOLOGICAL LIMITED | 06367880 | 11/09/2007 | 01/03/2011 | One Red Flag |
| RSK RESOURCING LIMITED | 06000032 | 01/02/2007 | 01/12/2008 | Dissolved |
| RSK STATS ENVIRONMENT HEALTH AND SAFETY LIMITED | 04639175 | 16/01/2003 | 19/01/2009 | Not Trading |
| RSK STATS GEOCONSULT LIMITED | 02611785 | 14/01/2003 | 01/10/2009 | Amber |
| RSK TURKEY LIMITED | 04666254 | 13/02/2003 | 05/03/2014 | Dissolved |
| STRUCTURAL SOILS LIMITED | 00828694 | 28/02/2007 | 30/11/2007 | Bronze |
| TECHNICAL EDITING SERVICES LIMITED | 02928662 | 02/08/2007 | 20/10/2008 | Dissolved |
| THE PIPELINE INDUSTRIES GUILD LIMITED | 02563351 | 24/05/1995 | 12/06/2002 | Gold |