| 4 Wheels Direct Ltd | Wholesale & retail | 2025 |
| 4 Wheels Distribution Ltd | Transport & logistics | 2018 |
| 4 Wickham Road Management Limited | Households | 2017 |
| 4 Wilmington Square Ltd | Households | 2025 |
| 4 Winsley Street Ltd | Financial services | 2024 |
| 4 Winsley Street Trading Limited | Hospitality | 2025 |
| 4 Witherington Road Management Company Limited | Real estate | 2012 |
| 4 WM Reach Ltd | Real estate | 2025 |
| 4 Woburn News Ltd | Wholesale & retail | 2018 |
| 4 Woodberry Down Management Company Limited | Households | 2024 |
| 4 Woodchurch Road (Management) Limited | Households | 1999 |
| 4 Woodgrange Avenue Limited | Households | 1998 |
| 4 Woodmansterne Road Ltd | Real estate | 2024 |
| 4 Woods Road RTM Company Limited | Households | 2022 |
| 4 World Fibre Ltd | Information & communication | 2022 |
| 4 YOU Developments Ltd | Construction | 2018 |
| 4 YOU Electricals Services Ltd | Construction | 2025 |
| 4 YOU Films UK Ltd | Arts & recreation | 2024 |
| 4 Zone Ltd | Arts & recreation | 2020 |
| 4&8 Limited | Professional & scientific | 2009 |
| 4, 5, 6 Salcombe Gardens Limited | Households | 2022 |
| 4, Crane Court Management Company Limited | Households | 1979 |
| 4, Loveridge Road Limited | Households | 1978 |
| 4-12 Queen Anne's Gate Freehold Limited | Households | 2003 |
| 4-15 Films Ltd | Information & communication | 2025 |
| 4-22 Foundation C.I.C. | Education | 2019 |
| 4-5 Grays Inn Square Limited | Professional & scientific | 2013 |
| 4-5 North Mews Limited | Real estate | 2025 |
| 4-6 Abingdon Road LLP | | 2011 |
| 4-6 Ashvale Road RTM Company Limited | Households | 2020 |
| 4-6 Cranfield Road RTM Company Ltd | Households | 2022 |
| 4-6 Dilke Street LLP | | 2015 |
| 4-6 Greenwich Church Street Limited | Households | 2013 |
| 4-6 Manor Mount RTM Company Ltd | Households | 2015 |
| 4-6 ST Edmunds Terrace Developer Limited | Construction | 2014 |
| 4-6 ST Edmunds Terrace Limited | Construction | 2014 |
| 4-6A Worcester Road E.17 Residents Association Limited | Administrative & support | 2004 |
| 4-7 Manchester Street Residents Association Limited | Real estate | 2004 |
| 4-7 Railway Side (Barnes) Limited | Real estate | 2008 |
| 4-9 Windfield Close Management Company Limited | Households | 1992 |
| 4-BEAT Yoga Ltd | Education | 2023 |
| 4-ELEVEN Limited | Wholesale & retail | 2025 |
| 4-IN-1-GAMEBUNDLE Ltd | Wholesale & retail | 2026 |
| 4-IT Security Ltd | Information & communication | 2016 |
| 4-RAIL Services Limited | Professional & scientific | 1996 |
| 4-TRANS Ltd | Transport & logistics | 2015 |
| 4.0 Productions Ltd | Information & communication | 2022 |
| 4/5 Poynders Road Limited | Households | 1993 |
| 40 & 40A Birkbeck Road Management Company Limited | Households | 2026 |
| 40 & 40A Penwortham Road Ltd | Households | 2013 |
| 40 Acres Properties Limited | Information & communication | 2006 |
| 40 Alexandra Park Road (Wood Green) Limited | Households | 2003 |
| 40 Ambleside Management Company Limited | Households | 2018 |
| 40 and 40A Stondon Park (Forest Hill) Management Company Limited | Households | 2018 |
| 40 and 42 Market Place (Freehold) Company Limited | Households | 2007 |
| 40 Anerley Park Management Limited | Households | 1994 |
| 40 Anson Road Management Company Limited | Real estate | 1987 |
| 40 Bath Road (Freehold) Limited | Households | 2007 |
| 40 Beech Hill Developments Limited | Construction | 2017 |
| 40 Beresford Road Limited | Real estate | 2002 |
| 40 Blomfield Road Limited | Professional & scientific | 1983 |
| 40 Bramber Road Limited | Real estate | 2016 |
| 40 Bramham Gardens Limited | Households | 2000 |
| 40 Brondesbury Villas Managing Company Limited | Real estate | 2017 |
| 40 Brownhill Road Catford Management Company Limited | Households | 2014 |
| 40 Buckmaster Freehold Limited | Households | 2022 |
| 40 Cadogan Square (Management) Limited | Households | 1978 |
| 40 Cambridge Road South Management Company Limited | Households | 1992 |
| 40 Canewdon Road Residents Limited | Households | 2020 |
| 40 Canewdon Road RTM Company Limited | Households | 2009 |
| 40 Canning Road Limited | Households | 2010 |
| 40 Caversham Ltd | Real estate | 2025 |
| 40 Chancellors Road Ltd | Real estate | 2006 |
| 40 Chester Square Freehold Company Limited | Real estate | 2018 |
| 40 Clerkenwell Ltd | Real estate | 2025 |
| 40 Clifton Gardens Limited | Households | 2017 |
| 40 Cloudesley Road RTM Company Ltd | Households | 2016 |
| 40 Colvestone Crescent Management Limited | Hospitality | 1995 |
| 40 Commercial Street Limited | Hospitality | 2017 |
| 40 Compayne Gardens Limited | Households | 1994 |
| 40 Conduit Street Limited | Construction | 2025 |
| 40 Corfton Road Limited | Households | 2019 |
| 40 Craster Road Management Ltd | Real estate | 2020 |
| 40 Crewdson Road Limited | Real estate | 1987 |
| 40 Crockerton Road Limited | Households | 2002 |
| 40 Davisville Road Freehold Limited | Households | 2019 |
| 40 Degrees Limited | Professional & scientific | 1996 |
| 40 Delaford Street RTM Limited | Households | 2007 |
| 40 Digby Crescent Limited | Real estate | 2012 |
| 40 Dulwich Road RTM Company Limited | Households | 2019 |
| 40 Durham Road Limited | Real estate | 2003 |
| 40 Earlham Street Property Limited | Real estate | 2004 |
| 40 Eastlake Road (London) Limited | Households | 2014 |
| 40 Elspeth Road (Management Company) Limited | Households | 1992 |
| 40 Elsworthy Road NW3 RTM Company Ltd | Other services | 2017 |
| 40 Ennismore Freehold Limited | Real estate | 1983 |
| 40 Ennismore Gardens Limited | Households | 1974 |
| 40 Fathoms Limited | Administrative & support | 2020 |
| 40 Fentiman Road Limited | Households | 2017 |
| 40 Ferndale Road Freehold Limited | Real estate | 2026 |