| 40 Fernshaw Road Freehold Limited | Extraterritorial | 2017 |
| 40 George Ltd | Real estate | 2025 |
| 40 Gipsy Hill Freehold Limited | Households | 2013 |
| 40 GL Limited | Real estate | 2024 |
| 40 Gloucester Road Kensington Limited | Real estate | 2023 |
| 40 Golders Way Limited | Real estate | 2024 |
| 40 Great North Road Management Limited | Real estate | 2026 |
| 40 Green Street Limited | Real estate | 1998 |
| 40 Greenwood Road Limited | Households | 2024 |
| 40 Greyhound Road Limited | Households | 2018 |
| 40 Grosvenor Residents Property Management Limited | Real estate | 2017 |
| 40 Hackney Road Freehold Limited | Real estate | 2020 |
| 40 Hermon Hill RTM Company Limited | Real estate | 2008 |
| 40 High Street Eton Limited | Real estate | 2011 |
| 40 Highbury Place Limited | Households | 1999 |
| 40 Holland Road Limited | Real estate | 2018 |
| 40 Home Park Road Limited | Real estate | 2007 |
| 40 Hornton Street RTM Company Limited | Households | 2016 |
| 40 Hyde Park Gate Freehold Limited | Real estate | 1998 |
| 40 Hyde Park Gate Management Limited | Households | 1978 |
| 40 Kennington Lane Management Company Limited | Real estate | 2014 |
| 40 Keston Road Limited | Real estate | 2017 |
| 40 Lambrook Terrace Limited | Real estate | 2020 |
| 40 Lavender Sweep RTM Company Limited | Real estate | 2025 |
| 40 Lawrie Park Gardens (Sydenham) Flat Maintenance Limited | Households | 1970 |
| 40 LD Ltd | Other services | 2025 |
| 40 Lennox Gardens Limited | Real estate | 1996 |
| 40 Loftus Road Management Limited | Households | 2022 |
| 40 Loftus Road RTM Company Limited | Households | 2012 |
| 40 Lyford Road (Freehold) Limited | Households | 2024 |
| 40 Manor Avenue Freehold Limited | Households | 2017 |
| 40 Mapesbury Road Limited | Households | 2021 |
| 40 Maxwell Road Management Company Limited | Households | 2003 |
| 40 Methuen Park Management Company Ltd | Households | 2017 |
| 40 Miles a Day Ltd. | Information & communication | 2014 |
| 40 Milton Street RTM Company Limited | Households | 2019 |
| 40 Moore Park Road Management Company Limited | Households | 2003 |
| 40 Mountview Road Freeholders Limited | Households | 1999 |
| 40 Norbroke Street Limited | Real estate | 2020 |
| 40 Offley Road Freehold Limited | Households | 2015 |
| 40 Ongar Road Management Company Limited | Households | 2021 |
| 40 Overstone Road Management Company Limited | Households | 2009 |
| 40 Palace Road Management Limited | Households | 1995 |
| 40 Patshull Road Ltd | Households | 2021 |
| 40 Pember Road Limited | Real estate | 2012 |
| 40 Perham Road Limited | Households | 2006 |
| 40 Petherton Road Ltd | Households | 2016 |
| 40 PGT Limited | Real estate | 2018 |
| 40 Philbeach Gardens Limited | Households | 1988 |
| 40 Pont Street Freehold Limited | Real estate | 2010 |
| 40 Prebend Gardens Ltd | Professional & scientific | 2007 |
| 40 Priory Road (Freehold) Limited | Real estate | 2010 |
| 40 Queens Avenue (Freehold) Company Limited | Extraterritorial | 2008 |
| 40 Queens Avenue RTM Company Limited | Households | 2006 |
| 40 Rossiter Road Freehold Limited | Households | 2008 |
| 40 Ryders Terrace Management Company Limited | Households | 1992 |
| 40 Saltoun Road Freehold Company Limited | Households | 2012 |
| 40 Seasons Ltd | Wholesale & retail | 2025 |
| 40 Sellons Freehold Management Ltd | Real estate | 2021 |
| 40 Shorrolds Road Limited | Real estate | 2010 |
| 40 Sloane Court West Management Company Limited | Households | 2007 |
| 40 SR Ltd | Real estate | 2024 |
| 40 ST Julians Farm Road Limited | Households | 2025 |
| 40 ST Stephen's Gardens Limited | Households | 1996 |
| 40 Thornfield Management Limited | Households | 2015 |
| 40 Tredegar Square Limited | Real estate | 2016 |
| 40 Tregunter Road Limited | Households | 1998 |
| 40 Trewsbury RD Ltd | Households | 2021 |
| 40 Ulverston Road Limited | Households | 1991 |
| 40 Warwick Avenue Limited | Households | 1983 |
| 40 Waterford Road SW6 Limited | Households | 2019 |
| 40 Weltje Road Management Company Limited | Households | 2013 |
| 40 Westbourne Terrace Limited | Households | 1999 |
| 40 Windsor Road Residents Association Limited | Real estate | 1987 |
| 40 Wingford Road Management Limited | Real estate | 2005 |
| 40 Winks Limited | Real estate | 2024 |
| 40 Winks Sleep Ltd | Manufacturing | 2021 |
| 40 Woodstock Road Limited | Households | 2009 |
| 40 Yonge Park Limited | Households | 2008 |
| 40-42 Abbey Road LLP | | 2015 |
| 40-42 Brookwood Road Share SAL E Company Ltd | Real estate | 2025 |
| 40-42 Elms Avenue Freehold Ltd | Extraterritorial | 2007 |
| 40-42 Myddelton Square Limited | Administrative & support | 2008 |
| 40-44 Crookham Road Residents Association Limited | Real estate | 1997 |
| 40-44 Holdenhurst Road Limited | Real estate | 2021 |
| 40-46 Commercial Street Hereford Limited | Real estate | 2022 |
| 40-46 Surbiton Road Limited | Construction | 2019 |
| 40/41 Compton Road Residents Association Limited | Households | 1996 |
| 40/41 Cornwall Gardens (SW7) RTM Company Limited | Other services | 2006 |
| 40/42 Sutherland Street Residents Association Limited | Households | 1978 |
| 400 Baring Road (Freehold) Limited | Professional & scientific | 2016 |
| 400 Caledonian Road Management Company Limited | Households | 2015 |
| 400 Capital Management Europe Limited | Administrative & support | 2015 |
| 400 Longwater (UK) Limited | Real estate | 2019 |
| 400 LUX Ltd | Professional & scientific | 2017 |
| 400 PPM Limited | Professional & scientific | 2021 |
| 400-402 Brixton Road Management Company Limited | Households | 2009 |
| 4000 Mondays Ltd | Administrative & support | 2024 |
| 4000M Consulting Services Limited | Professional & scientific | 2014 |
| 401 Digital LAB Limited | Professional & scientific | 2024 |