| 4H2D Ltd | Reading | 2021 |
| 4HB Consulting Ltd | Leeds | 2023 |
| 4HERON Ltd | Manchester | 2020 |
| 4HGS Group Ltd | Tiptree | 2024 |
| 4HGS Ltd | Leamington Spa | 2009 |
| 4HOPE Ltd | London | 2026 |
| 4HOTO Memories Limited | Halesowen | 2015 |
| 4I Consulting Ltd | London | 2019 |
| 4I Solutions Limited | London | 2007 |
| 4I Water Services Ltd | Bury St. Edmunds | 2002 |
| 4IGUY Ltd | London | 2020 |
| 4IMPRINT Group PLC | London | 1921 |
| 4IMPRINT UK Holdings Limited | London | 2006 |
| 4INDOOR Ltd | Edinburgh | 2018 |
| 4IR Technical Services Ltd | Whitchurch | 2024 |
| 4J Ventures Ltd | Thornton,Cleveleys | 2018 |
| 4JAYZ Limited | Wirral | 2016 |
| 4JD Consulting Limited | West Malling | 2009 |
| 4JL-IT Limited | Sowerby Bridge | 2025 |
| 4K Consulting Ltd | Nottingham | 2020 |
| 4K Media Production Limited | London | 2022 |
| 4K Projects Limited | London | 2016 |
| 4KBW Limited | London | 2010 |
| 4KOM Ltd | London | 2025 |
| 4KS Accountancy Ltd | London | 2025 |
| 4L Energy Holdings Limited | Fraserburgh | 2019 |
| 4LAW4LIFE Limited | Doncaster | 2020 |
| 4LL Management Ltd | Rawtenstall | 2023 |
| 4LM Ltd | Plymouth | 2011 |
| 4M Aerospace Ltd | Dundee | 2017 |
| 4M Consulting Services Limited | Brentford | 2018 |
| 4M Digital Consulting Ltd | London | 2019 |
| 4M Engineering Ltd | Greenford | 2018 |
| 4M Entertainment Ltd | Newport | 2024 |
| 4M Enviroresponse Ltd | Inverurie | 2025 |
| 4M Integrated Control Solutions Limited | Dungannon | 2026 |
| 4M Jewellers Limited | Gloucester | 2008 |
| 4MA Design Collective Limited | Huddersfield | 2019 |
| 4MAC Limited | Macclesfield | 2006 |
| 4MAN Consulting Ltd | Dunnington | 2023 |
| 4MANAGEMENT Ltd | Preston | 2020 |
| 4MAR C Ltd | Cambridge | 2026 |
| 4MARK Ltd | London | 2026 |
| 4MATION Sports and Entertainment Group Ltd | London | 2018 |
| 4MB Ltd | London | 2026 |
| 4MD-KS Limited | Tadworth | 2024 |
| 4MMO Development Ltd | Hornchurch | 2020 |
| 4MOST Consulting Ltd | Buckinghamshire | 2025 |
| 4MOST Esot Limited | London | 2018 |
| 4MOST International Limited | Loughton | 2016 |
| 4MPH Futures Ltd | London | 2021 |
| 4MPLIFY Ltd | Newcastle Upon Tyne | 2025 |
| 4MRF Ltd | Chippenham | 2023 |
| 4MS Network Solutions (Glasgow) Ltd | Glasgow | 2025 |
| 4MST Limited | London | 2023 |
| 4MUL8 Ltd | Runcorn | 2016 |
| 4MY Limited | Holmfirth | 2024 |
| 4NB Consultancy Limited | Birmingham | 2015 |
| 4NLM Management Services Limited | Witney | 2024 |
| 4ON Ltd | Cheltenham | 2018 |
| 4ORM Architecture Ltd | Steyning | 2009 |
| 4ORT Ltd | Derby | 2024 |
| 4OUR Ltd | Haverhill | 2025 |
| 4P Management Ltd | St. Ives | 2020 |
| 4PAW Marketing Ltd | Wellingborough | 2023 |
| 4PB & MC Ltd | London | 2021 |
| 4PB (Services) Limited | London | 2025 |
| 4PD Limited | Bedworth | 2018 |
| 4PERFORMANCE Ltd | Crowthorne | 2024 |
| 4PG Management (UK) Ltd | Keighley | 2021 |
| 4PILLARS Consulting Limited | Derby | 2013 |
| 4PL Consultancy Limited | Crawley | 2012 |
| 4PM Recordings Ltd | Ilford | 2024 |
| 4POINT2 Limited | Sheffield | 2013 |
| 4PP Solutions Limited | Wantage | 2020 |
| 4PS Consulting Limited | Swindon | 2020 |
| 4PS Limited | London | 2002 |
| 4PW Ltd | Gloucester | 2018 |
| 4Q184. Ltd | London | 2025 |
| 4QK Limited | London | 2025 |
| 4QUADRANT Delivery Limited | Downham Market | 2021 |
| 4R Business Recovery Limited | Coalville | 2010 |
| 4R Environmental Consultants Limited | Knottingley | 2010 |
| 4R Group Limited | Knottingley | 2011 |
| 4R Link Ltd | London | 2022 |
| 4R Recruitment and Consult Ltd | Plymouth | 2019 |
| 4RAIL Consulting Ltd | Leeds | 2009 |
| 4RCE Creative Ltd | London | 2025 |
| 4REEM.INC Ltd | Poole | 2018 |
| 4RL Ltd | Alexandria | 2026 |
| 4RTISTRY Limited | Uxbridge | 2026 |
| 4S Architecture Limited | London | 2020 |
| 4S Consultancy Ltd | Blackpool | 2018 |
| 4S Industrial Supplies Limited | Manchester | 2012 |
| 4S Services Limited | Hayes | 2009 |
| 4S Talking Torque Limited | Cupar | 2004 |
| 4S Tech Safety Solutions Ltd | Glasgow | 2023 |
| 4S World Ltd | London | 2020 |
| 4S2 3D2 Scientific Limited | Edinburgh | 2014 |
| 4SA Ltd | London | 2026 |