| 21 Davenport Road Coventry Limited | Financial services | 2017 |
| 21 Davies Street Limited | Real estate | 2002 |
| 21 Dean Street Limited | Professional & scientific | 1998 |
| 21 Degrees London Ltd | Construction | 2024 |
| 21 Denbigh Street Management Limited | Households | 2006 |
| 21 Diamonds Ltd | Construction | 2022 |
| 21 Dollis Avenue Limited | Households | 2020 |
| 21 Dora Road RTM Company Limited | Real estate | 2026 |
| 21 Dorset Road Management Company Limited | Households | 2014 |
| 21 Dream Nails Ltd | Other services | 2022 |
| 21 Earlsfield Road Limited | Households | 1991 |
| 21 East Bank RTM Company Limited | Other services | 2009 |
| 21 Eaton Place Limited | Households | 2017 |
| 21 Eaton Rise (Management) Ltd. | Other services | 1993 |
| 21 Eccleston Square Associates Limited | Households | 2014 |
| 21 Eliot Park Freehold Company Limited | Households | 2024 |
| 21 Ellison Road Limited | Households | 2022 |
| 21 Elmbourne Road Management Limited | Households | 2023 |
| 21 Elmcourt Road Limited | Households | 2002 |
| 21 Empire Group Limited | Wholesale & retail | 2023 |
| 21 Epirus Road Holding Company Limited | Extraterritorial | 2016 |
| 21 Fairmile Avenue RTM Company Limited | Households | 2020 |
| 21 Fawnbrake Avenue Management Limited | Households | 2019 |
| 21 Fieldhouse Road Limited | Households | 2011 |
| 21 Filmworks Ltd | Information & communication | 2020 |
| 21 Finance & Associates Ltd | Financial services | 2022 |
| 21 Fordwych Road-Live Limited | Households | 2006 |
| 21 Fourth Avenue London W10 Limited | Households | 2010 |
| 21 Frankfurt Road Limited | Households | 2023 |
| 21 Fraser Street Limited | Construction | 2014 |
| 21 FS Ltd | Hospitality | 2024 |
| 21 Gillian Street RTM Company Limited | Households | 2010 |
| 21 Glengall Road Freehold Company Limited | Households | 2022 |
| 21 Glenrosa Street Freehold Limited | Households | 2020 |
| 21 Global Enterprise Limited | Wholesale & retail | 2024 |
| 21 Golden Square Ltd | Administrative & support | 2020 |
| 21 Golders Green Crescent Management Limited | Real estate | 2014 |
| 21 GP Limited | Administrative & support | 2023 |
| 21 Greek Street Ltd | Real estate | 2023 |
| 21 Haldon Road Limited | Households | 1986 |
| 21 Halliwell Street Limited | Real estate | 2018 |
| 21 Hampstead Hill Gardens Limited | Households | 1997 |
| 21 Hands Limited | Manufacturing | 2012 |
| 21 Hansler Road Limited | Real estate | 2003 |
| 21 Haslemere Road Limited | Hospitality | 2005 |
| 21 Helix Road Limited | Households | 2025 |
| 21 Heywood Limited | Households | 2022 |
| 21 Hillmarton Road Limited | Real estate | 1999 |
| 21 HL RTM Company Limited | Households | 2025 |
| 21 Holdings Limited | Information & communication | 2017 |
| 21 Holmewood Road Limited | Households | 2009 |
| 21 Homerton High Street Limited | Households | 2017 |
| 21 Howard Road Ltd | Real estate | 2024 |
| 21 Humber Road Limited | Professional & scientific | 2002 |
| 21 Huntingdon Street Management Limited | Households | 2000 |
| 21 Hyde Park Square Freehold Limited | Professional & scientific | 2003 |
| 21 Hyde Park Square Limited | Households | 1988 |
| 21 Interiors Ltd | Professional & scientific | 2021 |
| 21 Irene Road Management Limited | Extraterritorial | 2011 |
| 21 Jacksons Lane Limited | Real estate | 1982 |
| 21 Kempsford Gardens Limited | Real estate | 2018 |
| 21 Kensington Court Management Limited | Households | 1981 |
| 21 Keswick Road Managements Limited | Households | 1989 |
| 21 Khyber Road Limited | Real estate | 1999 |
| 21 Kyvdot Ltd | Real estate | 2023 |
| 21 Lady Somerset Road Freehold Limited | Households | 2018 |
| 21 Lavender Gardens Ltd | Real estate | 2006 |
| 21 Lessing Street Limited | Real estate | 2014 |
| 21 Lever Street Management Company Limited | Real estate | 2002 |
| 21 Lurline Gardens RTM Company Limited | Real estate | 2011 |
| 21 Mabley Street Company Limited | Households | 2023 |
| 21 Malwood Road Freehold Limited | Households | 2025 |
| 21 Malwood Road RTM Company Limited | Households | 2021 |
| 21 Manresa Limited | Households | 2004 |
| 21 Mart Ltd | Hospitality | 2025 |
| 21 Marylebone Limited | Information & communication | 2020 |
| 21 Maury Road Limited | Households | 2012 |
| 21 Mayfair Ltd | Extraterritorial | 2025 |
| 21 Mayflower Road Ltd | Households | 2025 |
| 21 Meatery Limited | Hospitality | 2025 |
| 21 Media Limited | Administrative & support | 2020 |
| 21 Milton Road Management Company Limited | Households | 2006 |
| 21 Minster Road Management Company Limited | Households | 1993 |
| 21 Moorhouse Road Management Company Limited | Households | 1995 |
| 21 Napier Road Ltd | Real estate | 2024 |
| 21 Nassington Road Limited | Households | 1991 |
| 21 New Fraser Street Limited | Financial services | 2015 |
| 21 North Limited | Other services | 2019 |
| 21 Northbourne Road Management Company Limited | Households | 2011 |
| 21 Oaks Limited | Professional & scientific | 2024 |
| 21 Oliver Grove RTM Company Limited | Households | 2013 |
| 21 Online Ltd | Wholesale & retail | 2022 |
| 21 Onyx Properties Ltd | Real estate | 2019 |
| 21 Overstone Road Limited | Households | 2016 |
| 21 Park Road Freehold Limited | Households | 2006 |
| 21 Passmore Street Limited | Real estate | 2022 |
| 21 Petherton Road Freehold Limited | Real estate | 2017 |
| 21 Plumbers ROW Limited | Construction | 2016 |
| 21 Popham Street Management Company Limited | Households | 2001 |
| 21 Prince of Wales Drive Management Company Ltd | Professional & scientific | 1997 |