| 48 Limited | Bedford | 2010 |
| 48 Upper Lewes Road (Residents) Association 2001 Limited | | 2001 |
| 48-50 Charteris Road Limited | London | 2010 |
| 48.3 Scaffold Design Limited | Northampton | 2011 |
| 4812 Limited | Leeds | 2017 |
| 4814 Designs Limited | Greenford | 2020 |
| 485 Capital Limited | London | 2016 |
| 486 YPL Ltd | London | 2023 |
| 487 Associates Limited | Wirral | 2024 |
| 488 Commerce Ltd | London | 2006 |
| 488 Limited | Bursledon | 2024 |
| 48CONSULTING Limited | Harrow | 2018 |
| 49 Acres Limited | London | 2011 |
| 49 Blomfield Road Limited | Altrincham | 1983 |
| 49 Edward Street RTM Company Limited | London | 2012 |
| 49 Gayton Road Management Limited | London | 1984 |
| 49 Kent Road Ltd | Southsea | 2023 |
| 49 North Digital Ltd | Farnborough | 2024 |
| 49 Oliver Road Residents Association Limited | Essex | 1999 |
| 49 Parks Ltd | Darlington | 2024 |
| 49 Performance Ltd | London | 2025 |
| 49 ST Georges Road Management Company Limited | London | 2011 |
| 49 Stockwell Road Management Company Limited | Greater London | 2002 |
| 491 Taxis Ltd | Edinburgh | 2019 |
| 4923 Ltd | London | 2024 |
| 496 Ltd. | Cirencester | 2011 |
| 497 DYL Ltd | Leicester | 2026 |
| 49A Rodney Street Limited | Liverpool | 2016 |
| 49DEG Limited | London | 2021 |
| 49TH Parallel IP Ltd | London | 2025 |
| 49WEST Ltd | London | 2021 |
| 4A Consulting Ltd | Witney | 2023 |
| 4A Law Ltd | Bristol | 2011 |
| 4A Law Public Interest Lawyers Ltd | Bristol | 2013 |
| 4A Management Limited | Preston | 2014 |
| 4A Management Services Ltd | London | 2018 |
| 4AB4 Ltd | Birmingham | 2021 |
| 4ACCOUNTING Limited | London | 2010 |
| 4ACT Limited | Nottingham | 2023 |
| 4ADVENTURES Limited | Holmfirth | 2018 |
| 4ADVISORY Limited | Beccles | 2013 |
| 4AM Design Limited | London | 2009 |
| 4AMWORLDWIDE Ltd | Bristol | 2024 |
| 4AN Holdings Ltd | South Croydon | 2025 |
| 4ANSWER Ltd | London | 2016 |
| 4ARCLEC Limited | London | 2013 |
| 4ASCONSULTING Ltd | Aberdeen | 2024 |
| 4AT Project Controls & Engineering Services Limited | Barnet | 2023 |
| 4AT Project Services Limited | Grimsby | 2018 |
| 4B Precision Engineering Ltd | Sunderland | 2010 |
| 4B Project Services Limited | London | 2023 |
| 4B Studio Ltd | Thame | 2021 |
| 4B2B Ltd | Ealing | 2016 |
| 4BASEBIO Discovery Limited | Cambridge | 2020 |
| 4BASEBIO PLC | Over | 2020 |
| 4BD Solutions Ltd | Uxbridge | 2024 |
| 4BEES Health Limited | Pinner | 2014 |
| 4BIM Limited | Cradley Heath | 2020 |
| 4BIO Capital Limited | London | 2024 |
| 4BIO Ventures Management Ltd | London | 2014 |
| 4BOX Consulting Ltd | London | 2019 |
| 4BRAINS Ltd | London | 2021 |
| 4BRIC Limited | Doncaster | 2022 |
| 4BRUCE Ltd | Solihull | 2024 |
| 4BUSINESS Consultancy Limited | London | 2011 |
| 4BUSINESS Support Ltd | Maldon | 2014 |
| 4BY4 Limited | Reading | 2024 |
| 4BY90 Limited | Croydon | 2011 |
| 4C Advisory Ltd | London | 2021 |
| 4C Associates Limited | London | 2000 |
| 4C Biomed Limited | London | 2020 |
| 4C Consultants Ltd | Barnstaple | 2020 |
| 4C Design Limited | 100 Borron Street, Glasgow | 2002 |
| 4C Europe UK Limited | London | 2010 |
| 4C Financial Technology Ltd | London | 2018 |
| 4C Global Consultancy Ltd | Aberdeen | 2020 |
| 4C Global Limited | London | 2011 |
| 4C Growth Limited | Chertsey | 2024 |
| 4C Management Limited | West Wickham | 2013 |
| 4C Marine Limited | Inverness | 2013 |
| 4C Media Limited | Cambridge | 2018 |
| 4C Partners (Scotland) Ltd | Aberdeen | 2023 |
| 4C Project Solutions Limited | Swadlincote | 2003 |
| 4C Research Group Limited | Banbury | 2022 |
| 4C Sports Ltd | Droitwich | 2025 |
| 4CAD Limited | London | 2020 |
| 4CAP Equity Limited | London | 2018 |
| 4CAST Bookkeeping Limited | Chesham | 2020 |
| 4CAST Group Limited | London | 2010 |
| 4CAUSE Limited | Chipping Norton | 2022 |
| 4CCS Development Ltd | Hornchurch | 2020 |
| 4CHANGE Ltd | Epsom | 2006 |
| 4CHERRY Ltd | Croydon | 2021 |
| 4CITE Workforce Solutions Ltd | Retford | 2022 |
| 4CLOVER 2025 Ltd | London | 2026 |
| 4CM Limited | Luton | 2011 |
| 4COMPLETE Ltd | Croydon | 2014 |
| 4CONSULTING Limited | Kirkcaldy | 2001 |
| 4CORECONSULTING Limited | Aberdeen | 2025 |
| 4CORNERS Property Ltd | Leamington Spa | 2017 |