| 4U Move Ltd | Real estate | 2020 |
| 4U Supported Living Ltd | Hospitality | 2025 |
| 4U Trip Ltd | Transport & logistics | 2022 |
| 4U2DAY Ltd | Wholesale & retail | 2024 |
| 4UADMISSION Consulting Co., Limited | Education | 2024 |
| 4UCONSULT Ltd | Information & communication | 2025 |
| 4UDEMAND Limited | Wholesale & retail | 2023 |
| 4UDIO Limited | Wholesale & retail | 2016 |
| 4UKSOFACLEANERS Ltd | Administrative & support | 2026 |
| 4ULINK Ltd | Professional & scientific | 2015 |
| 4UNDER3 Marathon MUM Ltd | Health & social care | 2025 |
| 4UNIMATE Boilers and Bathrooms Limited | Construction | 2025 |
| 4UNITY UK Limited | Administrative & support | 2021 |
| 4UR Store Limited | Other services | 2026 |
| 4US Yachting Ltd | Extraterritorial | 2021 |
| 4USELECTRIC Ltd | Construction | 2019 |
| 4V Holdings Ltd | Administrative & support | 2023 |
| 4V Limited | Professional & scientific | 2025 |
| 4V4 Construction Recruitment Group Ltd | Administrative & support | 2021 |
| 4VIBES Productions UK Limited | Information & communication | 2022 |
| 4W Trading Ltd | Wholesale & retail | 2020 |
| 4WARD Communications Limited | Information & communication | 2004 |
| 4WARDROBES Ltd | Wholesale & retail | 2020 |
| 4WAVES Limited | Administrative & support | 2015 |
| 4WAY Consulting Ltd | Professional & scientific | 2014 |
| 4WD Ltd | Administrative & support | 2017 |
| 4WELLNESS Ltd | Other services | 2025 |
| 4WILLOW & Co Ltd | Other services | 2026 |
| 4WR Ltd | Households | 2021 |
| 4X Global Research Ltd | Professional & scientific | 2017 |
| 4X4 Studio Ltd | Wholesale & retail | 2017 |
| 4XL Professional Services Limited | Professional & scientific | 2013 |
| 4XTRADZ Capital Limited | Financial services | 2026 |
| 4YBCE Limited | Construction | 2026 |
| 4YEYES Holdings Ltd | Financial services | 2024 |
| 4YEYES Limited | Health & social care | 2015 |
| 4YEYES Properties Ltd | Real estate | 2024 |
| 4YOU Agency Ltd | Information & communication | 2025 |
| 4YOU Builders Ltd | Manufacturing | 2025 |
| 4YOU Logistics Ltd | Wholesale & retail | 2026 |
| 4YOU Ltd | Construction | 2014 |
| 4YOU Projects LLP | | 2025 |
| 4YOU Property Real Estate & Development Ltd | Real estate | 2024 |
| 4YOUEXPRESS Ltd | Wholesale & retail | 2020 |
| 4YOUEXPRESS2 Ltd | Wholesale & retail | 2023 |
| 4YOUNGMINDS CIC | Education | 2021 |
| 4YOUNGMINDS Consultancy Ltd | Education | 2018 |
| 4YOURHOUSE Limited | Construction | 2015 |
| 4YUGAS Ltd | Wholesale & retail | 2023 |
| 4Z 68 High Street 2 Ltd | Real estate | 2021 |
| 4Z 68 High Street Ltd | Real estate | 2020 |
| 4Z Corp LLP | | 2025 |
| 4Z Holdings Ltd | Other services | 2020 |
| 4Z Services Ltd | Real estate | 2023 |
| 4Z Temple Court 2 Ltd | Real estate | 2022 |
| 4Z Temple Court Ltd | Real estate | 2020 |
| 4ZA Music Limited | Information & communication | 2020 |
| 5 & 6 Cromwell Place (Freehold) Limited | Extraterritorial | 2008 |
| 5 & 7, Camden Park Road Limited | Households | 1979 |
| 5 - 6 Oakley Crescent Limited | Real estate | 2007 |
| 5 - 7 Byrne Road Limited | Real estate | 2014 |
| 5 A&B Hillview Ltd | Households | 2019 |
| 5 Addington Road Management Ltd | Real estate | 2009 |
| 5 Ainger Road RTM Company Limited | Households | 2023 |
| 5 Alderbrook Road (Freehold) Limited | Households | 2011 |
| 5 AM Limited | Information & communication | 2008 |
| 5 Amity Grove Freehold Limited | Households | 2016 |
| 5 and 2 Education Limited | Education | 2025 |
| 5 and 5A Ravenstone Street Limited | Households | 1996 |
| 5 and 6 Airlie Gardens RTM Company Ltd | Households | 2025 |
| 5 and 6 Esplanade Gardens Limited | Real estate | 2026 |
| 5 and 7 York Street Limited | Households | 2006 |
| 5 Aylestone Avenue Management Limited | Real estate | 2012 |
| 5 Balfour Road (Freehold) Company Limited | Households | 2018 |
| 5 Baqee Ltd | Real estate | 2025 |
| 5 Bawdale Road Freehold Ltd | Households | 2018 |
| 5 Bean Blue Mountain Limited | Manufacturing | 2022 |
| 5 Beaumont Crescent (West Kensington) Limited | Professional & scientific | 1999 |
| 5 Benbow Road (Hammersmith) Management Co. Limited | Households | 1999 |
| 5 Bolingbroke Road Management Limited | Households | 2012 |
| 5 Boulcott Street (London) Limited | Households | 2020 |
| 5 Boulcott Street RTM Company Ltd | Households | 2017 |
| 5 Brackenbury Road Limited | Real estate | 2014 |
| 5 Bradiston Road Management Company Limited | Households | 2014 |
| 5 Broad Court Ltd | Real estate | 2023 |
| 5 Brooks Road (Freehold) Company Limited | Households | 2006 |
| 5 by 5 Operations Solutions Ltd | Information & communication | 2010 |
| 5 Callow Street Management Company Limited | Households | 2013 |
| 5 Cambridge Road Freehold Limited | Households | 2022 |
| 5 Cardigan Road Limited | Real estate | 2017 |
| 5 Castledine Road Limited | Households | 2009 |
| 5 Castletown Road Management Limited | Real estate | 2013 |
| 5 Cathnor Road Management Company Limited | Real estate | 2016 |
| 5 Cavendish Limited | Other services | 2022 |
| 5 Cedars Road Limited | Households | 2022 |
| 5 Chelsea Embankment Freehold Limited | Households | 2013 |
| 5 Chepstow Villas Limited | Households | 2021 |
| 5 Chestnut Grove Management Company Limited | Households | 2024 |
| 5 Christchurch RD (Management Co) Limited | Households | 1988 |
| 5 Churchill Place Management Company Limited | Real estate | 2018 |