| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Pennon Products Ltd | 01499385 | 01/08/2006 | Dissolved |
| Warren Jones Ltd | 02575700 | 01/08/2006 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ACETIP | 01576464 | 01/08/2006 | 31/05/2016 | Dissolved |
| ALBION WATER (SHOTTON) LIMITED | 03695161 | 01/08/2006 | 31/05/2016 | Dissolved |
| ANALAQ LIMITED | 02114891 | 01/08/2006 | 31/05/2016 | Dissolved |
| CENTRE FOR ENVIRONMENTAL RESEARCH LIMITED | 03367354 | 01/08/2006 | 31/05/2016 | Dissolved |
| D.M.P. (HOLDINGS) LIMITED | 02094479 | 01/08/2006 | 31/05/2016 | Dissolved |
| ELE DATASYSTEMS | 01085369 | 01/08/2006 | 31/05/2016 | Dissolved |
| EXE CONTINENTAL | 02376963 | 01/08/2006 | 31/05/2016 | Dissolved |
| GREENHILL ENVIRONMENTAL LIMITED | 01772778 | 01/08/2006 | 31/05/2016 | Dissolved |
| HAUL WASTE LIMITED | 00679090 | 01/08/2006 | 31/05/2016 | Dissolved |
| PENINSULA | 00685236 | 01/08/2006 | 31/05/2016 | Dissolved |
| PENINSULA LEASING LIMITED | 03926798 | 31/03/2015 | 31/05/2016 | Dissolved |
| PENINSULA MB LIMITED | 07871694 | 21/12/2011 | 27/05/2016 | Dissolved |
| PENNON PENSION TRUSTEES LIMITED | 02388620 | 02/03/2002 | 31/05/2016 | Not Trading |
| PENNON POWER LIMITED | 00736732 | 01/08/2006 | 31/05/2016 | Silver |
| PENNON SOUTH WEST LIMITED | 02421516 | 01/08/2006 | 31/05/2016 | Dissolved |
| PENNON WASTE MANAGEMENT LIMITED | 00574299 | 01/08/2006 | 31/05/2016 | Dissolved |
| PHOX SYSTEMS LIMITED | 01081019 | 01/08/2006 | 31/05/2016 | Dissolved |
| RYDON PROPERTIES LIMITED | 02406261 | 01/11/2006 | 31/05/2016 | Dissolved |
| SEAL SECURITY SYSTEMS LIMITED | 01841937 | 01/08/2006 | 31/05/2016 | Dissolved |
| SOUTH WEST WATER FINANCE PLC | 05722435 | 06/04/2006 | 31/05/2016 | Silver |
| SWW PENSION TRUSTEES LIMITED | 02451999 | 01/08/2006 | 31/05/2016 | Not Trading |
| THE METROPOLITAN WATER COMPANY LIMITED | 03376014 | 01/08/2006 | 31/05/2016 | Dissolved |
| VIRIDOR CONTRACTING LIMITED | 03736621 | 01/08/2006 | 31/05/2016 | Dissolved |
| VIRIDOR ENTERPRISES LIMITED | 02089280 | 01/08/2006 | 31/05/2016 | Dissolved |
| VIRIDOR SOUTH WEST LIMITED | 02649478 | 01/08/2006 | 31/05/2016 | Dissolved |
| VIRIDOR WASTE 2 LIMITED | 02298543 | 15/11/2007 | 31/05/2016 | Silver |
| WATER WEST LIMITED | 01195844 | 01/08/2006 | 31/05/2016 | Dissolved |