| 54SR Capital Ltd | London | 2026 |
| 55 Aldebaran Limited | Woking | 2022 |
| 55 Anderson Road Ltd | Birmingham | 2020 |
| 55 Argyle Road-Brighton Ltd | Brighton | 2014 |
| 55 Babington Road Limited | Hockley | 2014 |
| 55 Balcombe Street RTM Ltd | London | 2014 |
| 55 Beechfield Ltd | London | 2018 |
| 55 Bennerley Road Limited | Woking | 2002 |
| 55 Bishop KEN Road Ltd | Horsham | 2026 |
| 55 Blue Ltd | Wolverhampton | 2024 |
| 55 Bulwer Road (Freehold) Limited | London | 2026 |
| 55 Burlington Estates Ltd | London | 2024 |
| 55 Causeway Road Limited | Corby | 2018 |
| 55 Chepstow Road Limited | London | 2006 |
| 55 Churchfield Limited | Harrow | 2025 |
| 55 Clarendon Road Management Company Limited | Bristol | 2007 |
| 55 Conduit Street Management Limited | Batlesbridge | 2014 |
| 55 Crown Road Limited | Harlow | 2022 |
| 55 Dale Road Ltd | Barnet | 2024 |
| 55 Degrees Holding Limited | Newcastle Upon Tyne | 2023 |
| 55 Derby Road Limited | Derby | 2015 |
| 55 Disraeli Road Limited | Eastbourne | 2003 |
| 55 East Dulwich Road Limited | Beckenham | 2008 |
| 55 Elgin Crescent Limited | Watford | 1998 |
| 55 Elspeth Road Limited | London | 2018 |
| 55 Esplanade Avenue Management Company Limited | Porthcawl | 2015 |
| 55 Ferme Park Road Limited | Hornsey | 2012 |
| 55 Festing Road Ltd | Portsmouth | 2022 |
| 55 FS Ltd | Leeds | 2022 |
| 55 Gloucester Drive Company Limited | London | 2009 |
| 55 Grafton Road (London) RTM Company Limited | Bromley | 2016 |
| 55 Graveney Invest Ltd | London | 2025 |
| 55 Great Cumberland Place (London) Limited | London | 2026 |
| 55 Gunterstone Road Limited | | 1993 |
| 55 Hamid Limited | High Wycombe | 2017 |
| 55 Hans Place Management Company Limited | London | 2017 |
| 55 Harvist Road Limited | London | 2025 |
| 55 Headley Way (Oxford) Management Company Limited | Oxford | 2007 |
| 55 High Street Limited | London | 2022 |
| 55 Holmes Road Management Company Limited | | 2005 |
| 55 Hova Villas Limited | Hove | 2016 |
| 55 Hoxton Property Limited | Maldon | 2016 |
| 55 Investments Limited | Cardiff | 2016 |
| 55 Kenilworth Road Limited | St. Leonards-On-Sea | 2021 |
| 55 Lexham Limited | | 2002 |
| 55 Loder Road (Brighton) Limited | Brighton | 2012 |
| 55 Madeley Road Company Limited | London | 2003 |
| 55 Malvern Road (London E8) Management Limited | London | 2001 |
| 55 Management Ltd | London | 2022 |
| 55 Management Services Ltd | Wallsend | 2026 |
| 55 Marine Avenue Management Company Limited | Whitley Bay | 2010 |
| 55 Mayfair Properties Ltd | London | 2018 |
| 55 Mayfair Property Group Ltd | London | 2019 |
| 55 Milman Road Ltd | Slough | 2026 |
| 55 Mortimer Ltd | London | 2025 |
| 55 New Midlands Ltd | London | 2025 |
| 55 North Cross Road Management Company Limited | London | 2008 |
| 55 Northumberland Way Limited | Sidcup | 2022 |
| 55 Old Broad Street Limited | London | 2013 |
| 55 Ongar Road (Freehold) Limited | London | 2006 |
| 55 Parklands Malmesbury Limited | Stroud | 2012 |
| 55 Penylan Road Ltd | Cardiff | 2010 |
| 55 Pitfield Street Limited | Greenford | 2017 |
| 55 Portland Place Ltd | Croydon | 2014 |
| 55 Property Holdings Ltd | North Shields | 2016 |
| 55 Prothero Road Limited | London | 2005 |
| 55 QM Road RTM Company Limited | London | 2018 |
| 55 Queen's Gate Company Limited | Bourne End | 2000 |
| 55 Radnor Walk Freehold Limited | Barnard Castle | 2014 |
| 55 Residential Ltd. | London | 2020 |
| 55 Rosebery Gardens Management Limited | London | 2001 |
| 55 Saltoun Road Management Company Limited | London | 2002 |
| 55 Schubert Road Limited | | 2005 |
| 55 Silvester Limited | London | 2024 |
| 55 ST. Pauls Road Management Limited | London | 2001 |
| 55 Stanley Square Ltd | Carshalton | 2023 |
| 55 Steeles Road Management Company Ltd | London | 2018 |
| 55 Sunny Gardens Road Limited | London | 2006 |
| 55 the Martlett Subsidiary Limited | Shoreham-By-Sea | 2012 |
| 55 Tisbury Road Hove Ltd | Hove | 2021 |
| 55 Victoria Street Freehold Limited | St Albans | 2022 |
| 55 Warrior Square Management Company Limited | St. Leonards-On-Sea | 1980 |
| 55 Weltje Road Ltd | Bradford | 2017 |
| 55 Winns Terrace Ltd | Cheam | 2026 |
| 55 Woodland Rise (N10) Limited | London | 2003 |
| 55-57 Outram Road Ltd | Croydon | 2019 |
| 55/57/59 Cambridge Street Management Limited | London | 1997 |
| 550 Estates Ltd | Ilford | 2019 |
| 5514 Ltd | Beckenham | 2023 |
| 552 LR Limited | West Drayton | 2021 |
| 554 Barton Limited | Manchester | 2024 |
| 555 Alderley Edge Limited | Leeds | 2021 |
| 555 Guildford (1) Limited | Liverpool | 2022 |
| 555 Guildford Limited | Liverpool | 2022 |
| 555 Harrogate Limited | Leeds | 2021 |
| 555 Holdings Ltd | Bristol | 2025 |
| 555 Hyde Park Limited | London | 2018 |
| 555 London Road Freehold Limited | Southend-On-Sea | 2023 |
| 555 Mill Hill Limited | Leeds | 2021 |
| 555 Muswell Hill Limited | Leeds | 2021 |