| 55 Rosebery Gardens Management Limited | Real estate | 2001 |
| 55 RYE Hill Park Residents Limited | Households | 2002 |
| 55 Saltoun Road Management Company Limited | Real estate | 2002 |
| 55 Santos Road Freehold Limited | Households | 2018 |
| 55 Shepherds Hill Limited | Households | 2020 |
| 55 Silvester Limited | Real estate | 2024 |
| 55 ST George's Square Ltd | Hospitality | 2009 |
| 55 ST Julians Farm Road RTM Company Ltd | Households | 2015 |
| 55 ST. Pauls Road Management Limited | Real estate | 2001 |
| 55 Stanford Road Ltd | Households | 2022 |
| 55 Steeles Road Management Company Ltd | Real estate | 2018 |
| 55 Sunny Gardens Road Limited | Real estate | 2006 |
| 55 Sutherland Street Limited | Households | 2004 |
| 55 Tech Limited | Information & communication | 2024 |
| 55 Technologies UK Limited | Information & communication | 2023 |
| 55 Thurlestone Road RTM Company Limited | Households | 2021 |
| 55 Valetta Road Limited | Professional & scientific | 1991 |
| 55 Venn Street Management Limited | Extraterritorial | 2006 |
| 55 Warrington Crescent Limited | Households | 1982 |
| 55 Wellmeadow Road Limited | Households | 2004 |
| 55 Whiteley Road Freehold Ltd | Households | 2019 |
| 55 Woodland Rise (N10) Limited | Real estate | 2003 |
| 55-57 Gloucester Road SW7 Limited | Households | 2002 |
| 55-59 Beauchamp Road Residents Association Limited | Households | 2002 |
| 55-60 ST. Olafs Road Limited | Households | 1999 |
| 55-64 West Kensington Mansions Management Co. Limited | Professional & scientific | 1993 |
| 55/56 Holland Park (Management) Limited | Households | 1982 |
| 55/56, Cornwall Gardens Tenants Management Company Limited | Households | 1972 |
| 55/56/57 Warwick Square Limited | Households | 1993 |
| 55/57 Boscombe Road Management Limited | Households | 1988 |
| 55/57 Bramshot Avenue (London) Limited | Households | 2017 |
| 55/57 Cadogan Square Freehold Limited | Households | 2002 |
| 55/57 Fairholme Road (Management) Limited | Households | 1995 |
| 55/57 Onslow Gardens Limited | Households | 1996 |
| 55/57/59 Cambridge Street Management Limited | Real estate | 1997 |
| 55/59 Grange Road Management Limited | Households | 2008 |
| 554 BYA Ltd | Construction | 2023 |
| 554 Investments Limited | Administrative & support | 2024 |
| 555 Cafe Ltd | Hospitality | 2026 |
| 555 Cars Ltd | Transport & logistics | 2025 |
| 555 Enterprises Ltd | Information & communication | 2016 |
| 555 Hyde Park Limited | Real estate | 2018 |
| 555 Property Limited | Real estate | 2024 |
| 55A Chadwick Road Management Company 2015 Limited | Extraterritorial | 2015 |
| 55A Ferndale Ltd | Real estate | 2025 |
| 55CAP Limited | Financial services | 2017 |
| 55CH Ltd | Households | 2026 |
| 55COMMERCE Limited | Wholesale & retail | 2024 |
| 55E Consulting Limited | Professional & scientific | 2024 |
| 55E5 Ltd | Professional & scientific | 2014 |
| 55NORTH1EAST Ltd | Hospitality | 2018 |
| 55PEMBER Ltd | Households | 2022 |
| 55SPEARS Limited | Other services | 2025 |
| 55SQUARE Limited | Hospitality | 2019 |
| 55WC Limited | Construction | 2023 |
| 56 / 58 Fletching Road Limited | Households | 2018 |
| 56 58 Maddox ST RTM Company Limited | Real estate | 2026 |
| 56 Abbey RD Croydon Ltd | Households | 2021 |
| 56 Achilles Road Freehold Limited | Households | 2011 |
| 56 Addison Gardens Limited | Extraterritorial | 2013 |
| 56 Albert Street Limited | Households | 2010 |
| 56 Aubert Park Limited | Households | 2021 |
| 56 B Street Limited | Real estate | 2013 |
| 56 Black MEN Ltd | Administrative & support | 2018 |
| 56 Blandford ST Lease Ltd | Real estate | 2024 |
| 56 Blandford ST Ltd | Hospitality | 2024 |
| 56 Bond Ltd | Real estate | 2023 |
| 56 BOW Road Management Company Limited | Households | 1997 |
| 56 Brompton Square Freehold Limited | Households | 2010 |
| 56 Brunswick Gardens Management Limited | Administrative & support | 1983 |
| 56 Cadogan Place Limited | Households | 2006 |
| 56 Cavell Street Management Company Limited | Real estate | 1987 |
| 56 Claverton Street Freehold Limited | Households | 2007 |
| 56 Coleman Road RTM Company Limited | Households | 2013 |
| 56 Coolhurst Road Residents Association Limited | Households | 1996 |
| 56 Cranfield Road Brockley Management Limited | Households | 1990 |
| 56 Crediton Hill Limited | Households | 1996 |
| 56 Cultural Centre (London) | Administrative & support | 2025 |
| 56 Dagnall Park (Freehold) Limited | Real estate | 2020 |
| 56 Darnley Road Limited | Real estate | 2009 |
| 56 Dawes Road Limited | Wholesale & retail | 2022 |
| 56 Degrees Design Limited | Information & communication | 2013 |
| 56 Denbigh Street Management Limited | Hospitality | 1990 |
| 56 Denman Road Ltd | Households | 2017 |
| 56 Digital Arts Ltd | Education | 2025 |
| 56 Draycott Place Freehold Limited | Households | 2019 |
| 56 Draycott RTM Company Ltd | Households | 2017 |
| 56 Dukes Avenue Limited | Households | 1996 |
| 56 Elder Road Limited | Real estate | 2024 |
| 56 Elgin Crescent Freehold Limited | Households | 2010 |
| 56 Estates Limited | Real estate | 2022 |
| 56 Eton Avenue Garages Limited | Real estate | 2003 |
| 56 Fellows Road Limited | Administrative & support | 2011 |
| 56 Galveston Road Management Company Limited | Households | 2009 |
| 56 Glenburnie Road Management Company Limited | Households | 2022 |
| 56 Global Ltd | Financial services | 2026 |
| 56 Godolphin Road Management Limited | Financial services | 2023 |
| 56 Golders Green Limited | Hospitality | 2025 |
| 56 Grosvenor Street Limited | Real estate | 2024 |
| 56 Gubyon Avenue Management Company Limited | Households | 2014 |