| 55 - 57 Pont Street (Resident) Limited | Financial services | 2016 |
| 55 Agate Road Limited | Households | 2018 |
| 55 Amps | Financial services | 2022 |
| 55 Balcombe Street RTM Ltd | Real estate | 2014 |
| 55 Bassett Road Limited | Households | 2023 |
| 55 Beechfield Ltd | Real estate | 2018 |
| 55 Blomfield Road Limited | Households | 1983 |
| 55 Breakspears Management Ltd | Households | 2022 |
| 55 Buckley Road Management Company Limited | Households | 1996 |
| 55 Bulwer Road (Freehold) Limited | Real estate | 2026 |
| 55 Bulwer Road RTM Company Limited | Households | 2019 |
| 55 Burlington Estates Ltd | Real estate | 2024 |
| 55 Cambridge Grove Limited | Extraterritorial | 2003 |
| 55 Cancri-E Limited | Administrative & support | 2014 |
| 55 Central Hill Management Company Limited | Households | 1988 |
| 55 Chepstow Road Limited | Real estate | 2006 |
| 55 Chester Way Limited | Households | 1985 |
| 55 Cologne Road Residents Association Ltd | Households | 2011 |
| 55 Compton Road Freehold Company Limited | Households | 2018 |
| 55 Construction Ltd | Construction | 2015 |
| 55 Cranbury Road (Freehold) Limited | Households | 2013 |
| 55 Craven Avenue Limited | Households | 2021 |
| 55 Cromford Road Limited | Extraterritorial | 2004 |
| 55 CWW Ltd | Construction | 2022 |
| 55 Dafforne Road Limited | Hospitality | 2004 |
| 55 Dartmouth Road Ltd | Other services | 2018 |
| 55 Disraeli Road Freehold Limited | Households | 2015 |
| 55 Drayton Gardens Residents Association Limited | Households | 1977 |
| 55 Drewstead Road RTM Company Limited | Households | 2020 |
| 55 Eardley Crescent Management Company Limited | Households | 1994 |
| 55 Eaton Place (Freehold) Limited | Households | 2021 |
| 55 Eaton Place Limited | Households | 2012 |
| 55 Edith Grove Limited | Households | 2008 |
| 55 Elspeth Road Limited | Real estate | 2018 |
| 55 Films Limited | Information & communication | 2006 |
| 55 Financial Ltd | Wholesale & retail | 2019 |
| 55 Gloucester Drive Company Limited | Real estate | 2009 |
| 55 Grandison Limited | Households | 2014 |
| 55 Graveney Invest Ltd | Real estate | 2025 |
| 55 Great Cumberland Place (London) Limited | Real estate | 2026 |
| 55 Greencoat Place Ltd | Households | 2023 |
| 55 Gresham Limited | Financial services | 2018 |
| 55 Gresham Ventures Limited | Financial services | 2018 |
| 55 Gunnersbury Lane Ltd | Households | 1996 |
| 55 Gwendwr Road Management Company Limited | Households | 1976 |
| 55 Hackford Road Limited | Professional & scientific | 2009 |
| 55 Hans Place Management Company Limited | Real estate | 2017 |
| 55 Harvist Road Limited | Real estate | 2025 |
| 55 High Street Limited | Real estate | 2022 |
| 55 Hillfield Park Limited | Households | 2007 |
| 55 Hillfield Road Limited | Households | 2018 |
| 55 Holdings Limited | Professional & scientific | 2020 |
| 55 Howitt Road Limited | Households | 1998 |
| 55 HS Limited | Households | 2023 |
| 55 Hubert Grove Limited | Households | 2024 |
| 55 Hurstbourne Road Management Limited | Households | 2010 |
| 55 Idmiston Road Limited | Households | 2006 |
| 55 Ifield Road Management Limited | Households | 1997 |
| 55 Innovations Overseas Ltd | Information & communication | 2024 |
| 55 IVY Crescent Freehold Limited | Households | 2026 |
| 55 Jugglers Ltd | Information & communication | 2024 |
| 55 Kellett Road Management Ltd | Households | 2026 |
| 55 Krtc Limited | Hospitality | 2002 |
| 55 Larkhall Rise Management Company Limited | Administrative & support | 1997 |
| 55 Leander Road Limited | Households | 1995 |
| 55 Lichfield Grove Freehold Limited | Households | 2025 |
| 55 Live Ltd | Professional & scientific | 2020 |
| 55 Lordship Road Residents Company Limited | Households | 1982 |
| 55 Lyndhurst Drive Limited | Households | 2024 |
| 55 Madeley Road Company Limited | Real estate | 2003 |
| 55 Malvern Road (London E8) Management Limited | Real estate | 2001 |
| 55 Management Ltd | Real estate | 2022 |
| 55 Manor Avenue Freehold Limited | Households | 2018 |
| 55 Marylands Road RTM Company Limited | Extraterritorial | 2010 |
| 55 Mayfair Properties Ltd | Real estate | 2018 |
| 55 Mayfair Property Group Ltd | Real estate | 2019 |
| 55 Moore Park Road Limited | Extraterritorial | 2009 |
| 55 Mortimer Ltd | Real estate | 2025 |
| 55 Mossbury Road Freehold Management Company Limited | Households | 2023 |
| 55 New Midlands Ltd | Real estate | 2025 |
| 55 North Cross Road Management Company Limited | Real estate | 2008 |
| 55 Oakhurst Grove Management Company Limited | Households | 2021 |
| 55 Oakley Square (Residents) Limited | Hospitality | 1994 |
| 55 Old Broad Street Developer Limited | Construction | 2001 |
| 55 Old Broad Street Limited | Real estate | 2013 |
| 55 Oliver Road Management Company Limited | Households | 2010 |
| 55 Ongar Road (Freehold) Limited | Real estate | 2006 |
| 55 Oxford Gardens Limited | Households | 2008 |
| 55 Palace Road RTM Company Limited | Households | 2017 |
| 55 Parish Lane Freehold Limited | Households | 2024 |
| 55 Park Lane Limited | Households | 2001 |
| 55 Parliament Hill Limited | Extraterritorial | 2000 |
| 55 Penge Road RTM Company Limited | Households | 2020 |
| 55 Penn Road Management Company Limited | Households | 1997 |
| 55 Plus Ltd | Health & social care | 2005 |
| 55 Preston Road Limited | Households | 1998 |
| 55 Prothero Road Limited | Real estate | 2005 |
| 55 QM Road RTM Company Limited | Real estate | 2018 |
| 55 Redefined Ltd | Wholesale & retail | 2020 |
| 55 Residential Ltd. | Real estate | 2020 |