| ACCM Southwest Limited shared | · | · | active |
| ACCM SOUTHWEST LIMITED shared | · | · | active |
| AMD Electrical shared | · | · | active |
| Amelio Utilities Limited shared | · | · | active |
| Aqua Management Limited shared | · | · | active |
| AT Group (SW) Ltd shared | · | · | active |
| Austin's Contractors Ltd shared | · | · | active |
| BARNFIELD ENGINEERING SERVICES LIMITED shared | · | · | active |
| Bartlett Contractors Limited shared | · | · | active |
| Bridges (Electrical Engineers) Limited shared | · | · | active |
| BRIDGES (ELECTRICAL ENGINEERS) LIMITED shared | · | · | active |
| B.W. Controls Limited shared | · | · | active |
| BW CONTROLS LIMITED shared | · | · | active |
| B WILTSHIRE ELECTRICAL LIMITED shared | · | · | active |
| B WILTSHIRE ELECTRICAL LIMTED shared | · | · | active |
| Cambrian Civil Engineering Ltd shared | · | · | active |
| C D Read Building Services Ltd shared | · | · | active |
| C.I.W Electrical Services Limited shared | · | · | active |
| C.I.W. ELECTRICAL SERVICES LIMITED shared | · | · | active |
| C&N Electrical Services Limited shared | · | · | active |
| C. & P. ENGINEERING SERVICES LIMITED shared | · | · | active |
| C Squared Construct Limited shared | · | · | active |
| Dave Lucey Limited shared | · | · | active |
| Davis Groundworks Limited shared | · | · | active |
| DEVON & CORNWALL DC POWER LIMITED shared | · | · | active |
| Direct Utility Solutions Ltd shared | · | · | active |
| D.M.S. Engineering Limited shared | · | · | active |
| D.M.S. ENGINEERING LIMITED shared | · | · | active |
| Dowling and Cosh Limited shared | · | · | active |
| DOWLING AND COSH LIMITED shared | · | · | active |
| Dowling & Cosh Ltd shared | · | · | active |
| D.P. Burridge (Developments) Ltd shared | · | · | active |
| Earthstone Construction Ltd shared | · | · | active |
| EcoGenR8 Limited shared | · | · | active |
| ECOGENR8 LIMITED shared | · | · | active |
| Edron Engineering Limited shared | · | · | active |
| EDRON ENGINEERING LIMITED shared | · | · | active |
| ELECTRICAL AND PUMP SERVICES LIMITED shared | · | · | active |
| Electrical & Mechanical Solutions Limited shared | · | · | active |
| Electrical & Pump Services Ltd shared | · | · | active |
| ELG Civil and Mechanical Engeneering Limited shared | · | · | active |
| ELG Civil and Mechanical Engineering Limited shared | · | · | active |
| ELG Civil and Mechanical Engineering Ltd shared | · | · | active |
| Envolve infrastructure ltd shared | · | · | active |
| E T M Contractors Limited shared | · | · | active |
| FAIRFIELD ELECTRICAL 1971 LIMITED shared | · | · | active |
| Forest Electrical Services Limited shared | · | · | active |
| FOREST ELECTRICAL SERVICES LIMITED shared | · | · | active |
| F W Huxter Groundworks and Civil Engineering Limited shared | · | · | active |
| Galliford Try Construction Limited shared | · | · | active |
| GA UK Group Limited shared | · | · | active |
| GA UK GROUP LIMITED shared | · | · | active |
| Geemec Limited shared | · | · | active |
| GEEMEC LIMITED shared | · | · | active |
| Gel Engineering Limited shared | · | · | active |
| GEL ENGINEERING LIMITED shared | · | · | active |
| Gel Engineering Ltd shared | · | · | active |
| Glanville Cleansing Ltd shared | · | · | active |
| Going Group Limited shared | · | · | active |
| Going Group Ltd shared | · | · | active |
| Greenwood Construction Limited shared | · | · | active |
| Hanevo Limited shared | · | · | active |
| HANEVO LIMITED shared | · | · | active |
| Hanevo Ltd shared | · | · | active |
| Hercules Site Services PLC shared | · | · | active |
| H. M. ELECTRICAL SERVICES (1996) LIMITED shared | · | · | active |
| IES Utilites Group Ltd shared | · | · | active |
| IES Utilities Group Ltd shared | · | · | active |
| INTEGRATED WATER SERVICES LIMITED shared | · | · | active |
| Integrated Water Services Ltd shared | · | · | active |
| Ipsum Group Limited shared | · | · | active |
| J. Carney Construction Ltd shared | · | · | active |
| J Hardy Civils Limited shared | · | · | active |
| J.J. Electrical Limited shared | · | · | active |
| J.J. ELECTRICAL LIMITED shared | · | · | active |
| J M O'Toole Ltd shared | · | · | active |
| J.W. Groundworks Limited shared | · | · | active |
| K. Gregory Construction Limited shared | · | · | active |
| KNOWLTON AND NEWMAN LIMITED shared | · | · | active |
| Lynwood Civil Engineering Limited shared | · | · | active |
| Matthew Luke Plumbing & Heating Limited shared | · | · | active |
| MAX WRIGHT LIMITED shared | · | · | active |
| MBBELLS LIMITED shared | · | · | active |
| MBH INDUSTRIAL SERVICES LIMITED shared | · | · | active |
| McAllister Bros Limited shared | · | · | active |
| MEM Site Services Limited shared | · | · | active |
| MEM SITE SERVICES LIMITED shared | · | · | active |
| MEM Site Services Ltd shared | · | · | active |
| Mildren Construction Limited shared | · | · | active |
| MILDREN CONSTRUCTION LIMITED shared | · | · | active |
| Mildren Construction Ltd shared | · | · | active |
| Mills Engineering Services Limited shared | · | · | active |
| MILLS ENGINEERING SERVICES LIMITED shared | · | · | active |
| Mills Engineering Services Ltd shared | · | · | active |
| MSEL Services Limited shared | · | · | active |
| MSEL SERVICES LIMITED shared | · | · | active |
| Network Plus Services Limited shared | · | · | active |
| Network Plus Services Ltd shared | · | · | active |
| Nightjar Engineering and Construction Limited shared | · | · | active |
| NIGHTJAR ENGINEERING AND CONSTRUCTION LIMITED shared | · | · | active |
| NPB Utilities Limited shared | · | · | active |
| OCU NORTHAVON GROUP LIMITED shared | · | · | active |
| OCU Utility Services Ltd shared | · | · | active |
| OnSite Central Limited shared | · | · | active |
| OnSite Central Ltd shared | · | · | active |
| PEARCE AND WYATT SERVICES LIMITED shared | · | · | active |
| Pearce & Wyatt Services Limited shared | · | · | active |
| Phil Bridges & Son Electrical Limited shared | · | · | active |
| Pro Electro Limited shared | · | · | active |
| PRO ELECTRO LIMITED shared | · | · | active |
| Promec Engineering Limited shared | · | · | active |
| PUMP SUPPLIES LIMITED shared | · | · | active |
| RENN CONSULTANCY LIMITED shared | · | · | active |
| Renn Consultancy Ltd. shared | · | · | active |
| rhames Limited shared | · | · | active |
| R Howard Utilities Limited shared | · | · | active |
| R Howard Utilities Ltd shared | · | · | active |
| R&W Langley Limited shared | · | · | active |
| SAMATRIX LIMITED shared | · | · | active |
| San Electrical Limited shared | · | · | active |
| SAN ELECTRICAL LIMITED shared | · | · | active |
| S & A Utilities Ltd shared | · | · | active |
| SDR Metal Fabrications LLP shared | · | · | active |
| Sherborne Utilities Limited shared | · | · | active |
| Sherborne Utilities Ltd shared | · | · | active |
| Silon Engineering and Construction Limited shared | · | · | active |
| SILON ENGINEERING AND CONSTRUCTION LIMITED shared | · | · | active |
| SOUTH HEAT AND ELECTRICAL LIMITED shared | · | · | active |
| S&S Southwest Construction Ltd shared | · | · | active |
| Stonbury Ltd shared | · | · | active |
| Suttle Projects Limited shared | · | · | active |
| Swanside Limited shared | · | · | active |
| TJB Plant Hire shared | · | · | active |
| Tork Limited shared | · | · | active |
| TOTAL AUTOMATED SOLUTIONS LIMITED shared | · | · | active |
| Trant Engineering Ltd shared | · | · | active |
| UKSE Group Limited shared | · | · | active |
| United Infrastructure Water Limited shared | · | · | active |
| Unitspark Limited shared | · | · | active |
| Velta Construction Limited shared | · | · | active |
| Woodmace Concrete Structures Limited shared | · | · | active |
| XYLEM WATER SOLUTIONS UK LIMITED shared | · | · | active |