| 4 Green Street Limited | Real estate | 2025 |
| 4 Greenwich South Street Limited | Households | 2001 |
| 4 Gunnersbury Lane Management Limited | Households | 2018 |
| 4 Gunter Grove (Chelsea) Limited | Households | 2013 |
| 4 Gwendwr Limited | Real estate | 2020 |
| 4 G’S Concepts Ltd | Construction | 2025 |
| 4 Halford Road Limited | Households | 2005 |
| 4 Halkin Street Management Limited | Households | 2007 |
| 4 Hampstead Hill Gardens Limited | Households | 1992 |
| 4 Hanway Place Ltd | Real estate | 2015 |
| 4 Harold Road Management Company Limited | Households | 2009 |
| 4 HC Holdings Limited | Real estate | 2026 |
| 4 Helensley Limited | Real estate | 2019 |
| 4 Hell OR High Water Limited | Hospitality | 2023 |
| 4 Heps Property Services Ltd | Construction | 2025 |
| 4 High Court Limited | Real estate | 2015 |
| 4 Highgate West Hill Limited | Households | 2021 |
| 4 Hjartan Limited | Extraterritorial | 2025 |
| 4 Holmcote Gardens Ltd | Real estate | 2003 |
| 4 House Properties Ltd | Other services | 2023 |
| 4 Howley Place Limited | Hospitality | 2007 |
| 4 Huguenot Place Limited | Households | 2005 |
| 4 I Property Limited | Real estate | 2024 |
| 4 Imprint USA Limited | Professional & scientific | 1994 |
| 4 in 1 Coffee Dessert Ltd | Hospitality | 2025 |
| 4 Joinery Limited | Manufacturing | 2022 |
| 4 K a Freehold Company Limited | Households | 2025 |
| 4 Kids Properties Ltd | Real estate | 2010 |
| 4 Killowen Road Limited | Professional & scientific | 2008 |
| 4 King Edward's Road RTM Company Limited | Households | 2013 |
| 4 L Lounge Ltd | Hospitality | 2024 |
| 4 Ladbroke Gardens Limited | Real estate | 2025 |
| 4 Ladies Cleaning Services Ltd | Administrative & support | 2025 |
| 4 Lancaster Grove (Freehold) Limited | Households | 2020 |
| 4 Langland Gardens (Freehold) Limited | Households | 2022 |
| 4 Lanhenvor Avenue Ltd | Real estate | 2025 |
| 4 Layer Gardens Limited | Households | 2003 |
| 4 Leathwaite Road Limited | Households | 2008 |
| 4 Leighton Crescent Management Limited | Households | 1986 |
| 4 Lichfield Road RTM Company Limited | Households | 2011 |
| 4 Life Direct International Management Service Limited | Financial services | 2012 |
| 4 Littles Ltd | Manufacturing | 2025 |
| 4 Lochs Care Solutions Ltd | Professional & scientific | 2026 |
| 4 Lofting Road Limited | Households | 2024 |
| 4 Loris Road (Freehold) Limited | Households | 2013 |
| 4 Lyndhurst Gardens Limited | Real estate | 1986 |
| 4 Maberley Road Management Limited | Households | 1990 |
| 4 Maida Vale (Private Housing) Management Company Limited | Households | 2003 |
| 4 Maida Vale Management Company Limited | Households | 2003 |
| 4 Majek Property Ltd | Real estate | 2023 |
| 4 Manor Road Management Company Limited | Households | 2020 |
| 4 Mansfield Road RTM Company Limited | Households | 2025 |
| 4 Manson Place Management Company Limited | Households | 1990 |
| 4 Marble House Ltd | Real estate | 2026 |
| 4 Medley Road Limited | Extraterritorial | 1998 |
| 4 Merchant Square East Management Limited | Households | 2010 |
| 4 Merchant Square Residential Ltd | Real estate | 2007 |
| 4 Mexfield Road Limited | Professional & scientific | 2003 |
| 4 Middleton Grove Limited | Households | 1988 |
| 4 Milton Avenue Limited | Households | 1991 |
| 4 Minster Road Limited | Households | 2004 |
| 4 Mirabel Road, Fulham Residents Association Limited(The) | Households | 1986 |
| 4 Model Consultants Limited | Administrative & support | 2012 |
| 4 Moorcroft Road (London) Limited | Households | 2015 |
| 4 Moreton Place Management Company Limited | Households | 1996 |
| 4 Morley Road Residents Limited | Households | 2003 |
| 4 Morna Road Freehold Limited | Real estate | 2014 |
| 4 Mount Park Road W5 Tenants Limited | Real estate | 2000 |
| 4 Mountgrove Road Limited | Extraterritorial | 2014 |
| 4 MW Ltd | Administrative & support | 2016 |
| 4 M’S Global Foods Ltd | Wholesale & retail | 2024 |
| 4 Narbonne AVE Freehold Limited | Households | 2021 |
| 4 Nassington Road Limited | Households | 1996 |
| 4 Nesbitts Alley Freehold Ltd | Households | 2025 |
| 4 Nevill Road Management Company Limited | Households | 2008 |
| 4 New Square Limited | Administrative & support | 2012 |
| 4 Newtown Road Hove Limited | Households | 2005 |
| 4 Northwood Road Freehold Limited | Households | 2017 |
| 4 NPR Limited | Arts & recreation | 2024 |
| 4 Oakdene Avenue (SPV) Ltd | Real estate | 2024 |
| 4 Odessa Road Limited | Hospitality | 2013 |
| 4 Offord Road Limited | Extraterritorial | 2020 |
| 4 P William Ltd | Real estate | 2021 |
| 4 Pages Lane London Limited | Households | 2014 |
| 4 Paget Ltd | Real estate | 2020 |
| 4 Paradise Gardens Limited | Real estate | 2016 |
| 4 Park END Management Limited | Real estate | 1997 |
| 4 Parkholme Road Limited | Households | 1998 |
| 4 Parks Limited | Professional & scientific | 2025 |
| 4 Paws Dog Stylist Ltd | Other services | 2023 |
| 4 Pembridge Villas Limited | Real estate | 2003 |
| 4 Pendennis Road Limited | Real estate | 2013 |
| 4 Penford Street (London) Limited | Households | 2020 |
| 4 Penwith Road Limited | Real estate | 2017 |
| 4 Pepys Road Limited | Households | 2014 |
| 4 Pillar Technologies UK Limited | Information & communication | 2013 |
| 4 Pillars Global Trading LLP | | 2026 |
| 4 Pipes UK Ltd | Administrative & support | 2024 |
| 4 Plato Road (Freehold) Company Limited | Households | 2009 |
| 4 Pleasure Ltd | Wholesale & retail | 2024 |