| 21 PM Investment Limited | Potters Bar | 2021 |
| 21 Properties Limited | London | 2022 |
| 21 Property Investment Ltd | Dartford | 2021 |
| 21 Property Limited | Derby | 2022 |
| 21 Property Management Limited | Leicester | 2024 |
| 21 Queens Road Management Company (2006) Limited | Sevenoaks | 2006 |
| 21 Rastell Avenue Limited | London | 2004 |
| 21 Rectory Road Rickmansworth Management Limited | Watford | 1989 |
| 21 Red Lion Street UK Limited | London | 2005 |
| 21 Refurbishments Limited | Newcastle Upon Tyne | 2024 |
| 21 Regent ST Block MGT Co Ltd | Poole | 2023 |
| 21 Richford Ltd | London | 2017 |
| 21 Rosenau Limited | Banbury | 2009 |
| 21 Rowfant Road Limited | London | 2013 |
| 21 SE38SL Ltd | Westerham | 2021 |
| 21 Seaton Avenue RTM Company Limited | Plymouth | 2015 |
| 21 Second Avenue Management Limited | East Sussex | 1998 |
| 21 Sevington Road Ltd | Cardiff | 2018 |
| 21 Seymour Road Limited | London | 2009 |
| 21 Seymour Street Limited | London | 1994 |
| 21 Sixty SIX Ltd | Southampton | 2021 |
| 21 Smith Ltd | London | 2025 |
| 21 Spencer Road Residents Company Limited | South Croydon | 1974 |
| 21 ST Catherines Road Management Ltd | Ferndown | 2026 |
| 21 ST Faiths Road Management Co Limited | Chingford | 2011 |
| 21 ST James Road Limited | Reading | 2003 |
| 21 ST Mary's Road Freehold Limited | London | 2022 |
| 21 ST Peters Road Freehold Ltd | London | 2020 |
| 21 Stanhope Road N6 Freehold Limited | Southampton | 2009 |
| 21 Star Ltd | Bridlington | 2017 |
| 21 Station Road Limited | East Grinstead | 2024 |
| 21 Storeys Ltd | London | 2025 |
| 21 Streatham Common South Limited | London | 2001 |
| 21 Sussex Street Management Limited | London | 1992 |
| 21 Sutton Road Limited | London | 2014 |
| 21 the Avenue Ltd | Weston-Super-Mare | 2023 |
| 21 the Barbican Limited | Plymouth | 2025 |
| 21 the Causeway Management Limited | Chippenham | 2006 |
| 21 the Crescent Ltd | Folkestone | 2024 |
| 21 Thornlaw Road Limited | London | 2013 |
| 21 Thurlow Road Management Company Limited | London | 1989 |
| 21 Tierney Road RTM Company Limited | London | 2012 |
| 21 Trentham Street Ltd | Alton | 2017 |
| 21 Two Property Company Limited | Kirkcaldy | 2025 |
| 21 Upper Lattimore Road Limited | St. Albans | 2005 |
| 21 Victoria Avenue Harrogate Limited | Harrogate | 2019 |
| 21 Wallis Close Limited | Hatfield | 2025 |
| 21 Wellington Esplanade Limited | London | 2003 |
| 21 West END Avenue Management Company Limited | Ilkley | 2000 |
| 21 Westbourne Road N7 Limited | London | 1998 |
| 21 Western Place Worthing Ltd | Brighton | 2018 |
| 21 Westwell Road Freehold Limited | Staines-Upon-Thames | 2025 |
| 21 Woodland Terrace Amenity Limited | Plymouth | 2008 |
| 21 Woodstreet Ltd | London | 2021 |
| 21 WS GP Limited | London | 2019 |
| 21 York Road Ltd | Harrow | 2013 |
| 21 York Road RTM Company Limited | Worthing | 2025 |
| 21 Yorkshire Limited | Leeds | 2025 |
| 21 ZEN Property Ltd | Blackpool | 2024 |
| 21-22 Forest Lane (Freehold) Limited | London | 2014 |
| 21-22 Westbourne Street Management Co. Limited | Richmond | 1999 |
| 21-23 Palace Gate Management Limited | London | 2001 |
| 21-24 ASH Tree Road (NP26 5NU) Freehold Limited | Caldicot | 2026 |
| 21-24 QN ST Holdings Limited | London | 2026 |
| 21-24 QN ST Operator Limited | London | 2026 |
| 21-24 QN ST Property Owner Limited | London | 2026 |
| 21/22 Nassau Street Management Limited | Brighton | 1991 |
| 21/23 Palmeira Avenue Mansions Limited | Hove | 2016 |
| 21/24 Queen's Gardens Management Limited | London | 1989 |
| 21/25 Sloane Gardens Limited | Pinner | 2000 |
| 210 Bedford Hill Limited | London | 1989 |
| 210 Bicycle Shop Limited | Altrincham | 2019 |
| 210 Cavendish Road London Freehold Ltd | Guildford | 2025 |
| 210 Clapton Ltd | London | 2023 |
| 210 ST. Margaret's Road Twickenham Management Company Limited | Sunbury-On-Thames | 1997 |
| 210 to 216 Portland Road Limited | Lewes | 2012 |
| 210 Tufnell Park Road Management Company Limited | | 2000 |
| 2109 Ltd | Ashford | 2017 |
| 211 Properties Ltd | Sale | 2021 |
| 211 Queenstown Road Limited | Altrincham | 2001 |
| 2110 Limited | Swansea | 2025 |
| 2112 Group Holdings Limited | Birmingham | 2020 |
| 2114 Property Limited | Gerrards Cross | 2026 |
| 211ABC Ltd | Nottingham | 2021 |
| 212 Capital Ltd | London | 2018 |
| 212 Malvern Road Freehold Ltd | Bournemouth | 2020 |
| 212 Old Brompton Road Freehold Limited | London | 2026 |
| 212 Properties Limited | Edinburgh | 2020 |
| 212 VM Limited | Stockport | 2022 |
| 212/214 Ravensbourne Avenue Management Limited | Beckenham | 2004 |
| 2121 Estates Limited | Longniddry | 2019 |
| 2122 Great Minster Ltd | London | 2015 |
| 2123 High Portishead Bristol (Freeholdco) Limited | Shirebrook | 2025 |
| 2125 Ltd | Barnsley | 2026 |
| 2126 Property Ltd | Gerrards Cross | 2024 |
| 213 Gisburn Road Limited | Manchester | 2021 |
| 213 Living Limited | Leicester | 2013 |
| 213 North Street Limited | London | 2024 |
| 2134 Times SQ SC Sutton (Freeholdco) Limited | Shirebrook | 2018 |
| 2135 Coney ST York (Freeholdco) Limited | Shirebrook | 2018 |