| 21 Properties Limited | Real estate | 2022 |
| 21 Publishing Limited | Manufacturing | 1996 |
| 21 Queens Drive Limited | Households | 2005 |
| 21 Radbourne Road Freehold Limited | Extraterritorial | 2016 |
| 21 Rastell Avenue Limited | Real estate | 2004 |
| 21 Red Lion Street UK Limited | Real estate | 2005 |
| 21 Redcliffe Square Limited | Households | 1998 |
| 21 Richford Ltd | Real estate | 2017 |
| 21 Richmond Crescent Flats Ltd. | Households | 2004 |
| 21 Road Limited | Manufacturing | 2017 |
| 21 Rockley Road Limited | Professional & scientific | 2001 |
| 21 Rosendale Road Management Group Limited | Households | 2025 |
| 21 Rosslyn Hill (Freehold) Limited | Households | 2015 |
| 21 Rowfant Road Limited | Real estate | 2013 |
| 21 Sandrock Road Freehold Limited | Households | 2022 |
| 21 Services Limited | Administrative & support | 2021 |
| 21 Seymour Road Limited | Real estate | 2009 |
| 21 Seymour Street Limited | Real estate | 1994 |
| 21 Shepherds Hill Management Company Limited | Households | 2000 |
| 21 SID Limited | Construction | 2012 |
| 21 SID Property Ltd | Construction | 2025 |
| 21 Skills Hub Ltd | Education | 2023 |
| 21 Smith Ltd | Real estate | 2025 |
| 21 Solent Road Limited | Households | 1997 |
| 21 Squared Ltd | Professional & scientific | 2026 |
| 21 ST Mary's Road Freehold Limited | Real estate | 2022 |
| 21 ST Peters Road Freehold Ltd | Real estate | 2020 |
| 21 ST Stephens Avenue Ltd | Households | 2007 |
| 21 Station Road RTM Company Limited | Households | 2016 |
| 21 Steeles Road Limited | Households | 2021 |
| 21 STF Limited | Households | 2020 |
| 21 Storeys Ltd | Real estate | 2025 |
| 21 Strathearn Road Management Company Limited | Hospitality | 2006 |
| 21 Streatham Common South Limited | Real estate | 2001 |
| 21 Sussex Street Management Limited | Real estate | 1992 |
| 21 Sutton Road Limited | Real estate | 2014 |
| 21 Sylvan Limited | Households | 2017 |
| 21 the Little Boltons Limited | Households | 1968 |
| 21 Thornlaw Road Limited | Real estate | 2013 |
| 21 Thurlow Road Management Company Limited | Real estate | 1989 |
| 21 Tierney Road RTM Company Limited | Real estate | 2012 |
| 21 Treport Street Management Company Limited | Households | 1996 |
| 21 Trinity Rise Freehold Company Limited | Households | 2006 |
| 21 TV Ltd | Information & communication | 2010 |
| 21 Vicar Street Developments Limited | Construction | 2022 |
| 21 Vision Limited | Administrative & support | 2008 |
| 21 Walton Way Management Company Limited | Households | 2024 |
| 21 Warrington Crescent Management Company Limited | Households | 1993 |
| 21 Water Street Cat Sales Limited | Wholesale & retail | 2025 |
| 21 Wellington Esplanade Limited | Real estate | 2003 |
| 21 Westbourne Road N7 Limited | Real estate | 1998 |
| 21 Westcroft Square RTM Company Ltd | Households | 2016 |
| 21 Whittinstall Road SW6 Limited | Households | 2010 |
| 21 Wimpole Street Group Practice Limited | Health & social care | 2020 |
| 21 Wisteria RD Limited | Households | 2019 |
| 21 Wisteria Road Management Company Limited | Households | 2025 |
| 21 Woodstreet Ltd | Real estate | 2021 |
| 21 Worlingham Road Management Company Limited | Households | 2024 |
| 21 Wray Crescent Management Co. Limited | Households | 2010 |
| 21 WS GP Limited | Real estate | 2019 |
| 21 WS Limited Partnership | | 2019 |
| 21 WS Nominee Limited | Financial services | 2019 |
| 21 WTR Freehold Ltd | Administrative & support | 2007 |
| 21, Vanbrugh Hill Management Company Limited | Households | 1981 |
| 21-16 Limited | Arts & recreation | 2023 |
| 21-22 Forest Lane (Freehold) Limited | Real estate | 2014 |
| 21-22 Gosfield Street Limited | Households | 2010 |
| 21-23 Ladbroke Gardens Limited | Households | 2014 |
| 21-23 Palace Gate Management Limited | Real estate | 2001 |
| 21-23 Pleshey Road RTM Company Limited | Households | 2008 |
| 21-24 QN ST Holdings Limited | Real estate | 2026 |
| 21-24 QN ST Operator Limited | Real estate | 2026 |
| 21-24 QN ST Property Owner Limited | Real estate | 2026 |
| 21-30 Prince of Wales Mansions Residents Association Limited | Households | 2006 |
| 21-40 Cambridge Mansions Freehold Company Limited | Households | 2026 |
| 21-40 Canons Park Close RTM Company Limited | Households | 2007 |
| 21/22 Queen's Gate Gardens Limited | Households | 1996 |
| 21/22 Wallace Road Management Limited | Households | 2024 |
| 21/23 Anerley Park Residents Association Limited | Households | 1995 |
| 21/24 Queen's Gardens Management Limited | Real estate | 1989 |
| 21/25 DE Vere Gardens Limited | Households | 2002 |
| 21/40 Albert Palace Mansions Residents Association Limited | Households | 1981 |
| 210 Amesbury Avenue RTM Company Limited | Households | 2019 |
| 210 Bath Road Management Company Limited | Households | 2010 |
| 210 Bedford Hill Limited | Real estate | 1989 |
| 210 Clapton Ltd | Real estate | 2023 |
| 210 Investments Limited | Financial services | 2019 |
| 210 Middle Lane Ltd | Health & social care | 2025 |
| 210 Sinclair Road Limited | Households | 1986 |
| 210 Walm Lane Limited | Households | 2014 |
| 2100 Ventures Ltd | Professional & scientific | 2022 |
| 2102 Commodities Ltd | Professional & scientific | 2013 |
| 2103 Consulting Services Limited | Professional & scientific | 2025 |
| 2107 Authentic Lebanese Food Ltd | Hospitality | 2026 |
| 211 Auto LAB Ltd | Wholesale & retail | 2026 |
| 211 Devonshire Road Freehold Limited | Households | 2021 |
| 211 Latchmere Road Limited | Households | 2015 |
| 211 Ltd | Wholesale & retail | 2023 |
| 211 Old Ford Road RTM Company Limited | Households | 2016 |
| 211 Stanstead Road Management Company Limited | Administrative & support | 2004 |