| Company | Bulk supply transactions |
| Affinity Water | AFW bulk supply |
| Anglian Water | ANH bulk supply |
| Bristol Water | BRL bulk supply |
| Dee Valley Water | DVW bulk supply |
| Dŵr Cymru | WSH bulk supply |
| Hafren Dyfrdwy | HDD bulk supply |
| Independent Water Network | IWNL bulk supply |
| Northumbrian Water | NES bulk supply |
| Portsmouth Water | PRT bulk supply |
| Severn Trent Water | SVT bulk supply |
| South and East Surrey Water | SES bulk supply |
| South East Water | SEW bulk supply |
| South Staffs Water | SSC bulk supply |
| South West Water | SWB bulk supply |
| Southern Water | SRN bulk supply |
| SSE Water | SSE bulk supply |
| Thames Water | TMS bulk supply |
| United Utilities Water | UUW bulk supply |
| Wessex Water | WSX bulk supply |
| Yorkshire Water | YKY bulk supply |