| 1 Lansdowne Walk Limited | Administrative & support | 2010 |
| 1 Leadenhall GP Limited | Real estate | 2017 |
| 1 Leadenhall Limited Partnership | | 2017 |
| 1 Leadenhall Nominee Limited | Real estate | 2017 |
| 1 Leathwaite Road Limited | Extraterritorial | 2021 |
| 1 Leconfield Road Management Limited | Households | 2013 |
| 1 Leicester Road Limited | Real estate | 2021 |
| 1 Leicester Square Hotel Limited | Hospitality | 2024 |
| 1 Lime Grove (Shepherds Bush) Limited | Households | 1997 |
| 1 Lindore Road Management Company Limited | Extraterritorial | 2003 |
| 1 Living Property UK Investments - UK Ltd | Households | 2024 |
| 1 Lyndhurst Gardens Limited | Real estate | 1999 |
| 1 Lyndhurst Road Management Limited | Households | 2017 |
| 1 Lynton Road Limited | Hospitality | 2011 |
| 1 Manor Road RTM Company Limited | Households | 2025 |
| 1 Mapleton Crescent Limited | Construction | 2006 |
| 1 Mark Square Tenant Limited | Real estate | 2015 |
| 1 Mawson Close Management Company Limited | Households | 2016 |
| 1 Melrose Investments Ltd | Financial services | 2026 |
| 1 MIC Live Ltd | Arts & recreation | 2015 |
| 1 Mild END Ltd | Hospitality | 2019 |
| 1 Million Bricks Ltd | Real estate | 2024 |
| 1 Millway Limited | Real estate | 2017 |
| 1 Minster House Ltd | Real estate | 2024 |
| 1 Minus 1 Limited | Information & communication | 2003 |
| 1 Minute History Ltd | Education | 2021 |
| 1 Mkmn Properties Limited | Real estate | 2023 |
| 1 MM Media Limited | Information & communication | 2010 |
| 1 MO Limited | Construction | 2020 |
| 1 MOD Ltd | Information & communication | 2026 |
| 1 Model Management London Limited | Administrative & support | 2023 |
| 1 Montenotte Road Limited | Hospitality | 2001 |
| 1 Montpelier Road RTM Company Limited | Households | 2022 |
| 1 More Buy Limited | Information & communication | 2014 |
| 1 Mowbray Road (Freehold) Ltd | Real estate | 2025 |
| 1 Nelson Road Freehold Limited | Households | 2019 |
| 1 Newburgh Road Limited | Real estate | 2024 |
| 1 North Pole Road (Management) Limited | Households | 2008 |
| 1 Northbrook Road RTM Company Limited | Households | 2010 |
| 1 Number Properties Ltd | Real estate | 2025 |
| 1 Oak Entertainment (UK) Limited | Other services | 2018 |
| 1 Oak Production Services Limited | Information & communication | 2025 |
| 1 Oakley Gardens (Freehold) Limited | Households | 2025 |
| 1 OBA Limited | Transport & logistics | 2011 |
| 1 of 1 Beauty Ltd | Wholesale & retail | 2026 |
| 1 of 1 Car Group Limited | Wholesale & retail | 2026 |
| 1 of 1 Consultancy Ltd | Professional & scientific | 2026 |
| 1 of 1 World Limited | Information & communication | 2016 |
| 1 on 1 Art School Ltd | Education | 2023 |
| 1 on 1 Productions Limited | Information & communication | 2025 |
| 1 OR None Ltd | Wholesale & retail | 2025 |
| 1 Orion AI Ltd | Information & communication | 2026 |
| 1 Orwell Ltd | Real estate | 2017 |
| 1 Paradise Gardens Limited | Real estate | 2016 |
| 1 Parcel Ltd | Transport & logistics | 2016 |
| 1 Park END Limited | Real estate | 2021 |
| 1 Park Hill Clapham Management Limited | Households | 2001 |
| 1 Parkers Hill Management Co Ltd | Real estate | 2023 |
| 1 Parkers Hill TPH Limited | Construction | 2021 |
| 1 Pearson Square Ltd | Real estate | 2023 |
| 1 Pemberton Gardens (Management) Limited | Administrative & support | 1983 |
| 1 Penfold Place RTM Company Limited | Real estate | 2024 |
| 1 Perrers Road Limited | Households | 2010 |
| 1 Pest Control Ltd | Administrative & support | 2022 |
| 1 Peterborough Villas Limited | Households | 1998 |
| 1 Pinfold Road Limited | Households | 2008 |
| 1 Plus (Europe) Ltd | Real estate | 2019 |
| 1 Plus 1 Moving Limited | Transport & logistics | 2026 |
| 1 Plus 1 Removals Ltd | Transport & logistics | 2024 |
| 1 Plus Horizon Limited | Real estate | 2019 |
| 1 Point Plumbing and Heating Services Ltd | Construction | 2023 |
| 1 Poultry Tenant Limited | Real estate | 2017 |
| 1 Pound Wins Ltd | Professional & scientific | 2025 |
| 1 Primrose Gardens Residents Company Limited | Households | 1992 |
| 1 Queensberry Place RTM Company Limited | Households | 2016 |
| 1 Ravenhurst Avenue RTM Company Limited | Households | 2020 |
| 1 Ravenna Road Management Company Ltd. | Households | 2014 |
| 1 Ravenscroft Avenue Freehold Ltd | Households | 2022 |
| 1 Ravenstone Road Limited | Real estate | 2004 |
| 1 Recreation Road Management Company Limited | Health & social care | 1985 |
| 1 Rede Place Limited | Construction | 2013 |
| 1 Ribblesdale Road Management Company Limited | Real estate | 2014 |
| 1 Ripplevale Grove Limited | Real estate | 2017 |
| 1 River View Ltd | Hospitality | 2020 |
| 1 Roland Gardens Freehold Management Limited | Households | 2025 |
| 1 Rosemont Road Freehold Limited | Households | 2021 |
| 1 Russell Road RTM Company Limited | Households | 2025 |
| 1 Rutland Gate Limited | Households | 1983 |
| 1 Salisbury House Ltd | Real estate | 2026 |
| 1 Sarlsdown Road Limited | Administrative & support | 2017 |
| 1 Sash Properties Limited | Information & communication | 2024 |
| 1 Saville Road Management Company Limited | Households | 2012 |
| 1 Savoy Road Limited | Households | 2012 |
| 1 Sawmill LDN Limited | Real estate | 2019 |
| 1 Scope Property Limited | Real estate | 2024 |
| 1 Secure Solutions Ltd | Real estate | 2021 |
| 1 Shalimar Road Limited | Households | 2011 |
| 1 Sherbrooke Road Ltd | Real estate | 2007 |
| 1 Shot Tech Limited | Information & communication | 2023 |
| 1 Shukran Limited | Real estate | 2024 |