| 20A Grove Road Limited | Real estate | 2026 |
| 20APR Ltd | Real estate | 2021 |
| 20B Roding Ltd | Administrative & support | 2011 |
| 20CM Management Services Ltd | Real estate | 2024 |
| 20D Ltd | Information & communication | 2024 |
| 20F Acton Lane Ltd | Real estate | 2024 |
| 20FIT UK Ltd. | Wholesale & retail | 2016 |
| 20FIVE Holdings Limited | Health & social care | 2021 |
| 20FT Box Ltd | Other services | 2026 |
| 20G Partnerschaftskapital Ltd | Financial services | 2025 |
| 20GOTO10 Ltd | Information & communication | 2015 |
| 20IM Limited | Wholesale & retail | 2021 |
| 20IM Soho Limited | Wholesale & retail | 2024 |
| 20ONE Consulting Ltd | Health & social care | 2016 |
| 20OXFORDROADCT Limited | Real estate | 2023 |
| 20POUNDS Ltd | Professional & scientific | 2012 |
| 20QUESTIONS Ltd | Professional & scientific | 2024 |
| 20SECONDSMEDIA Limited | Administrative & support | 2019 |
| 20SOMETHING Limited | Professional & scientific | 2019 |
| 20TECH Ltd | Information & communication | 2022 |
| 20TH Century COX Ltd | Information & communication | 2020 |
| 20TH Century Frames Limited | Manufacturing | 2008 |
| 20TH Century Gallery Limited | Wholesale & retail | 1982 |
| 20TH Century Lots Limited | Wholesale & retail | 2016 |
| 20TH Century Specs Ltd | Wholesale & retail | 2023 |
| 20TH Century Studios UK Global Productions Limited | Information & communication | 2013 |
| 20TH Century Studios UK Limited | Information & communication | 2008 |
| 20THCQUARTERS Ltd | Wholesale & retail | 2013 |
| 20THIRTYONE Ltd | Professional & scientific | 2026 |
| 20TWENTY People Solutions Ltd | Professional & scientific | 2026 |
| 20TWENTYCLEAN Ltd | Administrative & support | 2023 |
| 20VC Property Limited | Real estate | 2022 |
| 21 & 21A Daphne Street Ltd. | Households | 2016 |
| 21 & 22 Manor Cottages Approach Management Limited | Extraterritorial | 1999 |
| 21 & 22 Torriano Cottages Limited | Households | 2009 |
| 21 & 23 Paxton Road (Freehold) Limited | Households | 2023 |
| 21 & Westbourne Ltd | Other services | 2021 |
| 21 - 22 Highbury Crescent Limited | Households | 2006 |
| 21 - 26 Fairlawn RTM Company Limited | Households | 2024 |
| 21 / 23 Eardley Crescent Limited | Real estate | 2005 |
| 21 12 Labs Ltd | Information & communication | 2023 |
| 21 Adelaide Road Management Limited | Households | 2012 |
| 21 Adolphus Road RTE Company Limited | Real estate | 2010 |
| 21 Alma Ltd | Households | 2024 |
| 21 Altenburg Gardens, SW11 1JH Freehold Limited | Households | 2017 |
| 21 Ambleside Limited | Real estate | 2021 |
| 21 and 21A Mandalay Road Residents Association Limited | Households | 1992 |
| 21 and 21A Overdown Road Freehold Limited | Households | 2022 |
| 21 and 22 Stanhope Gardens Management Limited | Administrative & support | 1982 |
| 21 and 23 Belgrave Gardens Freehold Company Limited | Households | 2014 |
| 21 and One Ltd | Professional & scientific | 2026 |
| 21 Annandale Road Limited | Households | 1999 |
| 21 Anselm Road Ltd | Households | 2015 |
| 21 Applications Ltd | Information & communication | 2023 |
| 21 Arlington London Limited | Extraterritorial | 2010 |
| 21 ARV Manco Limited | Real estate | 2016 |
| 21 Ashley Road Limited | Households | 2007 |
| 21 Baldry Gardens Freehold Limited | Households | 2018 |
| 21 Balfour Road Limited | Real estate | 2008 |
| 21 Barnsbury Street Management Limited | Households | 1984 |
| 21 Beacon Road Limited | Real estate | 2000 |
| 21 Birkbeck Road (Management Company) Limited | Real estate | 2002 |
| 21 Bishopsbridge Road Management Company Limited | Real estate | 1982 |
| 21 Blackstone Legal Ltd | Professional & scientific | 2025 |
| 21 Blake Hall Road Management Limited | Households | 2001 |
| 21 Blythe Hill (Freehold) Limited | Households | 2013 |
| 21 Bolton Gardens Limited | Households | 2002 |
| 21 Brading Road Management Limited | Real estate | 2011 |
| 21 Bradiston Road Limited | Households | 2011 |
| 21 Brechin Place Freehold Limited | Households | 2009 |
| 21 Bridge Street Development Ltd | Construction | 2026 |
| 21 Brookfield Road Management Company Limited | Households | 2018 |
| 21 Brunswick Road Limited | Other services | 2001 |
| 21 Buckingham Gate Office Limited | Professional & scientific | 2015 |
| 21 Bute Street Limited | Hospitality | 2021 |
| 21 Cambridge Green RTM Company Limited | Households | 2022 |
| 21 Carmalt Gardens Limited | Real estate | 2023 |
| 21 Castletown RD (Freehold) Ltd | Households | 2005 |
| 21 Cavendish Road Limited | Households | 2004 |
| 21 Cecilia RD Management Ltd | Other services | 2025 |
| 21 Chaii Ltd | Hospitality | 2025 |
| 21 Chesham Place Limited | Households | 2006 |
| 21 Chetwode Road Management Company Limited | Households | 2025 |
| 21 Chobham Road RTM Company Limited | Households | 2013 |
| 21 Coleherne Road Limited | Households | 2001 |
| 21 Colehill Lane Management Company Limited | Households | 2010 |
| 21 Colenso Road RTM Company Limited | Households | 2009 |
| 21 Collingham Gardens Management Limited | Households | 1998 |
| 21 Collingham Place Limited | Real estate | 2023 |
| 21 Comyn Road Management Company Limited | Households | 1998 |
| 21 Construction Group Ltd | Construction | 2021 |
| 21 Consulting Limited | Professional & scientific | 2016 |
| 21 Cornwall Ltd | Education | 2021 |
| 21 Courtfield Gardens Limited | Households | 2006 |
| 21 Craven Hill Management Limited | Households | 1984 |
| 21 Crescent Road Limited | Households | 1991 |
| 21 Crossfield Road (Freehold) Limited | Real estate | 1998 |
| 21 Crouch Hall Road (Management) Limited | Households | 1993 |
| 21 Culmington Road Ealing Ltd | Households | 1997 |
| 21 Dancer Road (Hammersmith & Fulham) Residents Management Limited | Hospitality | 1983 |