| 5 Cintra Park Limited | Households | 1994 |
| 5 Circles Clothing Company Ltd | Wholesale & retail | 2025 |
| 5 Clarendon Drive Management Limited | Households | 2017 |
| 5 Clarendon Road (Freehold) Limited | Real estate | 2012 |
| 5 Claverton Street Management Company Limited | Households | 2011 |
| 5 Clifton Avenue Limited | Real estate | 1992 |
| 5 Coleherne Road Management Limited | Real estate | 2000 |
| 5 Colehill Lane Limited | Real estate | 2007 |
| 5 Colinette Road Management Company 1998 Limited | Households | 1998 |
| 5 Continents LDN Ltd | Real estate | 2020 |
| 5 Core Group - Training Limited | Education | 2025 |
| 5 Core Group Holding Limited | Financial services | 2024 |
| 5 Core Group Limited | Wholesale & retail | 2022 |
| 5 Corporation Limited | Information & communication | 2013 |
| 5 Cowper Road Limited | Households | 2016 |
| 5 Cranhurst Road Limited | Households | 2008 |
| 5 Cresswell Gardens Limited | Households | 2004 |
| 5 Cromwell Crescent Limited | Households | 2000 |
| 5 Crossfield Road Management Company Limited | Households | 2001 |
| 5 Cupar Road Limited | Households | 2017 |
| 5 Curzon Road (Muswell Hill) Limited | Real estate | 1994 |
| 5 D'Arblay Limited | Real estate | 2022 |
| 5 Dancer Road Residents Management Limited | Households | 2001 |
| 5 Darlaston Road Limited | Households | 2006 |
| 5 Day Photography School Ltd | Professional & scientific | 2024 |
| 5 DE Vere Gardens Management Company Limited | Households | 1990 |
| 5 Derby Street Limited | Real estate | 2022 |
| 5 Devonshire Place HG1 Limited | Real estate | 2026 |
| 5 Drayton Road RTM Limited | Other services | 2021 |
| 5 Dunlace Road E5 Limited | Households | 2018 |
| 5 Dunsmure Road Ltd | Extraterritorial | 2013 |
| 5 Dunstans Road Limited | Households | 2022 |
| 5 Dynham Road Management Company Limited | Real estate | 2015 |
| 5 E Ltd. | Education | 1998 |
| 5 Earl's Court Square Limited | Households | 1990 |
| 5 Eats Limited | Extraterritorial | 2020 |
| 5 Eccleston Square RTM Company Limited | Real estate | 2019 |
| 5 Eckstein Road Limited | Households | 2003 |
| 5 Eldon Grove Hampstead Limited | Households | 1989 |
| 5 Electrical Engineering Ltd | Construction | 2023 |
| 5 Eliot Hill Residents Association Limited | Households | 2001 |
| 5 Ennismore Gardens Management Limited | Households | 2000 |
| 5 Esplanade Gardens Limited | Real estate | 2025 |
| 5 Essex Grove Freehold Limited | Real estate | 2021 |
| 5 Executive Ltd | Transport & logistics | 2019 |
| 5 Fairholme Road Limited | Households | 2001 |
| 5 Fawley Road (Freehold) Limited | Households | 2018 |
| 5 Felix Avenue London Limited | Real estate | 2006 |
| 5 Felixstowe Road NW10 5SR (Freehold) Limited | Real estate | 2017 |
| 5 Flavours of Health Limited | Health & social care | 2017 |
| 5 Frayswater Limited | Real estate | 2024 |
| 5 Freelands Road (Bromley) RTM Company Limited | Real estate | 2016 |
| 5 Gambole Road Management Company Limited | Households | 2020 |
| 5 Gledhow Gardens Management Limited | Households | 1997 |
| 5 Glenelg Road Freehold Limited | Households | 2025 |
| 5 Gloucester Walk (Freehold) Limited | Real estate | 2015 |
| 5 Goldsmith Road London Limited | Real estate | 2009 |
| 5 Graham Avenue Limited | Real estate | 2015 |
| 5 Grandison Road Management Limited | Real estate | 2009 |
| 5 Greenlaw Court Ltd | Real estate | 2026 |
| 5 Greens Supplements UK Ltd | Manufacturing | 2024 |
| 5 Grittleton Road Limited | Extraterritorial | 1975 |
| 5 Hamilton Park Limited | Real estate | 2010 |
| 5 Hamlet Road Freehold Limited | Households | 2020 |
| 5 Hamlet Road RTM Company Limited | Households | 2017 |
| 5 Hanger Lane Limited | Real estate | 2008 |
| 5 Hanover Square GP Limited | Construction | 2007 |
| 5 Hanover Square Limited Partnership | | 2008 |
| 5 Harpenden Road Limited | Hospitality | 1994 |
| 5 Haven Green Ealing Limited | Real estate | 2003 |
| 5 Hawkwood Mount Freehold Limited | Households | 2007 |
| 5 Heber Road (Freehold) Ltd | Households | 2018 |
| 5 Hertford Street (Trading) Limited | Administrative & support | 2010 |
| 5 Hertford Street Limited | Administrative & support | 2009 |
| 5 Hertford Street Nominees Limited | Administrative & support | 2010 |
| 5 Heyworth Road Ltd | Real estate | 2022 |
| 5 Highgate Avenue Ltd | Households | 2025 |
| 5 Holmesdale Road Limited | Real estate | 2013 |
| 5 Honley Road Management Limited | Households | 2013 |
| 5 Hotford Limited | Real estate | 2021 |
| 5 Huddleston Road (Freeehold) Company Limited | Households | 2023 |
| 5 J Stafford Street Ltd | Real estate | 2025 |
| 5 Jeffreys Road Management Company Limited | Households | 1999 |
| 5 Jerningham Road Freehold Limited | Professional & scientific | 2021 |
| 5 Kenwyn Road Limited | Households | 2012 |
| 5 KEW Gardens Road Freehold Limited | Households | 2023 |
| 5 Keys Properties Ltd | Real estate | 2026 |
| 5 King Edwards Road RTM Company Limited | Households | 2010 |
| 5 King Henry's Road Limited | Households | 1989 |
| 5 Knollys Ltd | Households | 2022 |
| 5 KP Limited | Real estate | 2013 |
| 5 KS Capital Ltd | Real estate | 2019 |
| 5 Ladbroke Gardens (Management) Limited | Households | 1989 |
| 5 Ladbroke Square Freehold Limited | Households | 2021 |
| 5 Lads Group T/A MAH Skirting Shop & Joinery Ltd | Manufacturing | 2021 |
| 5 Lambolle Place Management Limited | Households | 2024 |
| 5 Langtry Road Limited | Real estate | 1993 |
| 5 Lauderdale Road (Maida Vale) Residents Management Limited | Households | 1983 |
| 5 Lavender Gardens Limited | Households | 1998 |
| 5 Lawn Road Development Ltd | Construction | 2022 |