| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Anchor Drilling Fluids Ltd | SC090461 | 31/12/2002 | Dissolved |
| Penrab Ltd | SC112745 | 21/08/2001 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BW GROUP UNLIMITED | SC159419 | 21/08/2001 | 01/11/2011 | Amber |
| CLEANCUT TECHNOLOGIES LIMITED | SC211751 | 11/10/2002 | 01/11/2011 | Dissolved |
| Drill Cuttings Ltd | SC231180 | 11/10/2002 | 31/05/2008 | Dissolved |
| M-I DRILLING FLUIDS U.K. UNLIMITED | SC161934 | 19/02/2001 | 01/11/2011 | Amber |
| M-I HOLDINGS (UK) UNLIMITED | SC235399 | 09/10/2002 | 01/11/2011 | One Red Flag |
| M-I PRODUCTION CHEMICALS U.K. LIMITED | 02636695 | 02/02/2004 | 28/05/2015 | Dissolved |
| M-I SWACO (UK) LIMITED | SC236479 | 08/10/2002 | 01/11/2011 | Dissolved |
| Shutoff Solutions Ltd | 01945632 | 21/08/2001 | 31/05/2008 | Dissolved |
| Swaco Ltd | 02112539 | 25/01/2001 | 31/05/2008 | Dissolved |
| UNITED WIRE LIMITED | SC001878 | 19/10/2001 | 01/11/2011 | Dissolved |