| 6 Abbeville Road RTM Company Limited | Other services | 2016 |
| 6 Adolphus Road Limited | Extraterritorial | 2002 |
| 6 Ainger Road Limited | Households | 1996 |
| 6 Aldridge Road Villas Management Limited | Real estate | 2016 |
| 6 Aldworth Grove (Freehold) Limited | Households | 2019 |
| 6 Alexandra Grove Management Company Limited | Households | 1997 |
| 6 Ancona Road Limited | Real estate | 2019 |
| 6 and 6A Parkhill Road Limited | Households | 2010 |
| 6 and 6A Westwood Court Management Limited | Households | 2011 |
| 6 and 8 Freedom Street Freehold Limited | Households | 2021 |
| 6 Angels Ltd | Construction | 2015 |
| 6 Archel Road Management Company Limited | Households | 2026 |
| 6 Atherfold Road - RTM Company Limited | Households | 2018 |
| 6 Aubrey Road Management Company Limited | Households | 1999 |
| 6 Auckland Road Ltd | Extraterritorial | 2013 |
| 6 Avenue Crescent Residents Limited | Households | 2018 |
| 6 Barnsbury Street (Islington) Limited | Households | 2004 |
| 6 Bartholomew Villas Management Company Ltd | Households | 2025 |
| 6 Bartholomew Villas RTM Company Limited | Households | 2011 |
| 6 Bath Street Ltd | Real estate | 2025 |
| 6 Bath Street Subco Limited | Real estate | 2025 |
| 6 Battledean Road Residents Association Limited | Other services | 1982 |
| 6 Bellefields Road Company Limited | Households | 2019 |
| 6 Belsham Street RTM Company Limited | Households | 2025 |
| 6 Belsize Park Gardens Management Company Limited | Extraterritorial | 2012 |
| 6 Bendall Mews Ltd | Real estate | 2023 |
| 6 Berry Street Limited | Real estate | 2024 |
| 6 Beverley Road RTM Company Ltd | Households | 2018 |
| 6 Bevis Marks Limited | Real estate | 2011 |
| 6 Bloomsbury SQ Limited | Real estate | 2022 |
| 6 Bolton Road Limited | Households | 1999 |
| 6 Breakspears Road Limited | Households | 2005 |
| 6 Brondesbury Road Limited | Households | 2001 |
| 6 Brothers London Ltd | Wholesale & retail | 2024 |
| 6 Buchanan Gardens Limited | Households | 2025 |
| 6 Byrne Road Limited | Real estate | 2018 |
| 6 C'S Skills Exchange Ltd | Education | 2021 |
| 6 Cactus Invest Ltd | Real estate | 2026 |
| 6 Cadogan Road Limited | Households | 2026 |
| 6 Cambridge Road North (Freehold) Limited | Households | 2012 |
| 6 Camden Hill Company Limited | Real estate | 1996 |
| 6 Canterury Road RTM Company Limited | Households | 2005 |
| 6 Cardozo Road Limited | Households | 1988 |
| 6 Castlebar Road Properties Limited | Real estate | 2021 |
| 6 Cathnor Road Management Company Limited | Households | 2014 |
| 6 Cavendish Road Limited | Real estate | 2016 |
| 6 Cavendish Road N4 Ltd | Households | 2023 |
| 6 Chatsworth Road Limited | Real estate | 1997 |
| 6 Cheniston Gardens Management Company Limited | Real estate | 2003 |
| 6 Cheyne Terrace Limited | Real estate | 2015 |
| 6 Clapham Road Limited | Real estate | 2025 |
| 6 Clarendon Rise Limited | Professional & scientific | 2001 |
| 6 Clifton Villas Limited | Real estate | 1982 |
| 6 Cloudesley Square Freehold (2) Limited | Households | 2002 |
| 6 Clydesdale Road Limited | Hospitality | 1982 |
| 6 College Road Limited | Households | 2020 |
| 6 Colyton Road Freeholders Limited | Households | 2018 |
| 6 Cornwall Gardens (Freehold) Company Limited | Households | 1997 |
| 6 Cornwall Gardens Management Company Limited | Households | 1984 |
| 6 Cornwall Road Management Company Limited | Administrative & support | 2006 |
| 6 Cromwell Crescent Management Company Limited | Households | 1988 |
| 6 Cromwell Grove Management Limited | Households | 2005 |
| 6 Crookham Road Management Limited | Real estate | 2003 |
| 6 Crowland Terrace Freehold Limited | Households | 2023 |
| 6 CS Constructions Group Ltd | Construction | 2019 |
| 6 D'S Limited | Extraterritorial | 2024 |
| 6 Dafforne Road Limited | Households | 2019 |
| 6 Day Extensions Limited | Construction | 2026 |
| 6 Day Films Ltd | Administrative & support | 2022 |
| 6 Deerdykes Place Ltd | Construction | 2020 |
| 6 Degree Media Ltd. | Administrative & support | 1984 |
| 6 Degrees (UK) Limited | Professional & scientific | 2014 |
| 6 Degrees Capital LLP | | 2022 |
| 6 Degrees Dating Ltd | Wholesale & retail | 2024 |
| 6 Degrees Global Limited | Professional & scientific | 2021 |
| 6 Degrees Properties Limited | Real estate | 2017 |
| 6 Degrees Studios Ltd | Professional & scientific | 2021 |
| 6 Degrees Talent Digital Limited | Administrative & support | 2016 |
| 6 Degrees Talent Limited | Administrative & support | 2011 |
| 6 Devonshire Terrace Limited | Households | 1985 |
| 6 Dickenson Road Limited | Households | 2017 |
| 6 Digits Ltd | Information & communication | 2026 |
| 6 Downs Road RTM Company Ltd | Households | 2014 |
| 6 Dudley Road Ltd | Households | 2012 |
| 6 Dulwich Road Limited | Households | 2009 |
| 6 Dumbarton Road Limited | Professional & scientific | 2022 |
| 6 Dunnage Crescent Limited | Households | 2012 |
| 6 Dunraven ST Freehold Ltd | Households | 2026 |
| 6 Dunstans Road (Freehold) Limited | Other services | 2017 |
| 6 Dynham Road Limited | Households | 2012 |
| 6 Earls Court Square Limited | Real estate | 2015 |
| 6 Eccleston Square Limited | Households | 1997 |
| 6 Edge Hill Freehold Limited | Real estate | 2011 |
| 6 Eliot Hill Freehold Limited | Households | 2025 |
| 6 Eliot Hill RTM Company Limited | Extraterritorial | 2024 |
| 6 ELM House Ltd | Real estate | 2020 |
| 6 Elton Road Bishopston Bristol Management Limited | Real estate | 2003 |
| 6 Ennismore Gardens Freehold Limited | Households | 2013 |
| 6 Erskine RD Ltd | Hospitality | 2026 |
| 6 Esplanade Gardens Limited | Real estate | 2025 |