| 3WTECH Ltd | Southall | 2021 |
| 3XP Energy Limited | London | 2006 |
| 3Y3KAY Limited | Luton | 2012 |
| 4 Albert Road Limited | Brighton | 2006 |
| 4 and 4A Darell Road Limited | East Sussex | 2005 |
| 4 Belmont (Bath) Limited | Somerset | 1979 |
| 4 Cast Fireplace Products Limited | Stoke-On-Trent | 1995 |
| 4 Challoner Street Limited | London | 2004 |
| 4 Counties Heating Ltd | Ashford | 2021 |
| 4 Dukes Avenue Chiswick Limited | Berkshire | 1994 |
| 4 Emery Road Management Company Limited | Bristol | 2021 |
| 4 Group South West Limited | Redruth | 2016 |
| 4 Harecourt Road (Management) Limited | | 1991 |
| 4 Harold Avenue Residents Association Ltd | Westgate-On-Sea | 2008 |
| 4 Hartfield Road Limited | Eastbourne | 2001 |
| 4 Heatons Electrical and Plumbing Ltd | Stockport | 2022 |
| 4 Hire Transport Ltd | Walton On The Hill | 2025 |
| 4 Hjartan Limited | London | 2025 |
| 4 Keys Financial Limited | Stourbridge | 2023 |
| 4 Kilos U.K Ltd | Worthing | 2018 |
| 4 Legal Limited | Manchester | 2008 |
| 4 Legal Solutions Limited | Manchester | 2008 |
| 4 Maintenance Fabrication Limited | Virginia Water | 2013 |
| 4 Maintenance.Org Ltd | Virginia Water | 2011 |
| 4 Medley Road Limited | London | 1998 |
| 4 Mountgrove Road Limited | London | 2014 |
| 4 Offord Road Limited | London | 2020 |
| 4 Onega Terrace, Bath Management Company Limited | Bath Avon | 2004 |
| 4 Oriental Place (Brighton) Ltd | Brighton | 1996 |
| 4 Parsons Mead Croydon CRO 3SL Limited | Uxbridge | 2015 |
| 4 Paws Friendly Limited | Ellesmere Port | 2016 |
| 4 Paws Hydrotherapy Centre Limited | Salisbury | 2024 |
| 4 Popes Lane Management Company Limited | London | 2012 |
| 4 Property Management Ltd | Longfield | 2022 |
| 4 Season Trading Investment Limited | London | 2021 |
| 4 Season Trading Limited | London | 2021 |
| 4 Seasons Maintenance Ltd | Newton Abbot | 2025 |
| 4 Smart Plant Limited | Sheffield | 2015 |
| 4 Southwell Gardens Freehold Limited | Potters Bar | 2011 |
| 4 Springfield Road Freehold Limited | London | 2003 |
| 4 ST James Road (Exeter) Management Company Limited | Exeter | 1989 |
| 4 Tax Limited | London | 2011 |
| 4 the Common Freeholders Ltd | London | 2008 |
| 4 Way Group Companies Limited | King'S Lynn | 2017 |
| 4 Ways Diagnostics Limited | Hemel Hempstead | 2016 |
| 4 Ways Telediagnostics Limited | Hemel Hempstead | 2016 |
| 4 Wheel Drive Limited | Harrogate | 2012 |
| 4 X Forge Limited | Gloucester | 2016 |
| 4-8 Minerva Street Management Company Limited | | 2001 |
| 40 Beauchamp Street Ltd | Cardiff | 2008 |
| 40 Clissold Crescent Residents Association Limited | | 1980 |
| 40 Degrees Marketing Ltd | Wakefield | 2018 |
| 40 Fernshaw Road Freehold Limited | London | 2017 |
| 40 Queens Avenue (Freehold) Company Limited | London | 2008 |
| 40 Westbourne RTM Company Limited | Hove | 2024 |
| 40-42 Elms Avenue Freehold Ltd | London | 2007 |
| 40-43 Sedley Grove Management Limited | Harefield | 2012 |
| 40-43 the Grove Teddington Residents Company Limited | Middlesex | 2001 |
| 40/40A Tennyson Street Limited | Bishops Stortford | 2010 |
| 400 Limited | Exeter | 2024 |
| 400 NCR Management Co Limited | Edinburgh | 2007 |
| 400 Taxis Ltd. | Edinburgh | 2016 |
| 4000 Holes Limited | Godalming | 2008 |
| 401 Bath Road Management Company Limited | Bristol | 2002 |
| 404 Business NOT Found Ltd | London | 2020 |
| 404 Hosting Ltd | London | 2022 |
| 408 Taxis Ltd. | Edinburgh | 2010 |
| 40C Edinburgh Limited | South Queensferry | 2008 |
| 41 - 42 Sandall Close Limited | London | 2021 |
| 41 Berrymead Gardens Ltd | London | 2003 |
| 41 Central Hill Limited | | 2000 |
| 41 College Avenue Management Company Ltd. | Plymouth | 1997 |
| 41 Croxley Road Limited | London | 2008 |
| 41 Down Road Flats Ltd | Epsom | 2020 |
| 41 Grand Parade Brighton Limited | East Sussex | 2006 |
| 41 Hartfield Crescent Freehold Limited | London | 2001 |
| 41 Park Road Limited | Hertfordshire | 2007 |
| 41 Rosslyn Hill Property Management Limited | Colchester | 1998 |
| 41 Sussex Place Management Company Limited | Bristol | 1991 |
| 41, Enys Road Residents Association Limited | Eastbourne | 1980 |
| 41, Warwick Avenue (Maintenance) Limited | Bedford | 1983 |
| 41-50 Cleveland Mansions RTM Company Limited | Angmering | 2015 |
| 416 New Cross Road Limited | London | 2004 |
| 41A Cromwell Avenue Limited | London | 1976 |
| 41LMR Limited | Northallerton | 2018 |
| 42 Alma Place Management Company Limited | Tyne & Wear | 2006 |
| 42 Claverton Street Limited | London | 2011 |
| 42 Guernsey Grove Limited | London | 2002 |
| 42 RPM Limited | Wolverhampton | 2009 |
| 42 Valmar Road Limited | London | 2007 |
| 42-43 Pall Mall Management Company Limited | London | 2014 |
| 42-44 North Street Management Company Limited | Bristol | 2005 |
| 422 Limited | Bristol | 2012 |
| 426 Scottaxis Limited | Edinburgh | 2020 |
| 42CLINICS Ltd | London | 2024 |
| 43 and 45 Park Street RTM Company Ltd | Southend-On-Sea | 2016 |
| 43 Berrymead Gardens Limited | | 2004 |
| 43 Brookville Road Limited | London | 2006 |
| 43 Carleton Road Limited | | 1996 |
| 43 Kemerton Road Limited | London | 2013 |