| 4C Executive Placement Ltd | Belfast | 2013 |
| 4C Norfolk Limited | King'S Lynn | 2023 |
| 4C Platform.Com Limited | South Cerney, Cirencester | 2010 |
| 4CCP Holding Ltd. | Harrow | 2003 |
| 4CIS Consultancy Limited | Salisbury | 2008 |
| 4CITY Tech Ltd | Dagenham | 2021 |
| 4CITYCLEAN Ltd | Stanmore | 2016 |
| 4CLEANING Limited | Wolverhampton | 2017 |
| 4CONSTRUCTION Consultants Ltd | Stevenage | 2022 |
| 4CUBE Investments Limited | Buckhurst Hill | 2013 |
| 4D & SJ Consulting Ltd | St. Asaph | 2024 |
| 4D Bitcoin Limited | Bedford | 2022 |
| 4D Business Solutions Limited | Retford | 2017 |
| 4D Cars Ltd | Manchester | 2020 |
| 4D Clean-Up Limited | Doncaster | 2021 |
| 4D Cleaning & Maintenance Limited | London | 2016 |
| 4D Design Agency Ltd | London | 2021 |
| 4D Effects Ltd | Maidenhead | 2009 |
| 4D Garden Design and Construction Ltd | Ormskirk | 2012 |
| 4D Haven Limited | Ruislip, | 2025 |
| 4D L&D Limited | Guildford | 2011 |
| 4D Labs Ltd | London | 2014 |
| 4D Luxury Ltd | Manchester | 2020 |
| 4D NAV Limited | Aberdeen | 2025 |
| 4D Plant & Tool Hire Ltd | Wakefield | 2026 |
| 4D Plant Ltd | Radlett | 2015 |
| 4D Prestige Cars Ltd | Bradford | 2023 |
| 4D Protection Ltd | Birmingham | 2025 |
| 4D Sports Group Ltd | London | 2019 |
| 4D Works Limited | Evesham | 2016 |
| 4D'S Cleaning Ltd | Newport | 2026 |
| 4DECORATION Ltd | Rotherham | 2013 |
| 4DEVZ Ltd | Haverhill | 2025 |
| 4DREYS Limited | Salisbury | 2016 |
| 4DS (Holdings) Ltd | Ossett | 2014 |
| 4DYNAMICS Corporation Limited | Bracknell | 2010 |
| 4E Tents Ltd | Canterbury | 2023 |
| 4E2E Ltd | Cambridge | 2016 |
| 4EC Labs Recruitment Ltd | London | 2023 |
| 4EDUCATION Recruitment Ltd | Birmingham | 2019 |
| 4ELEMENTZ CIC | Redruth | 2013 |
| 4ESSENCE Events Ltd | South Croydon | 2026 |
| 4EVER Care UK Limited | Blackburn | 2021 |
| 4EVER Green Limited | Aylesbury | 2008 |
| 4EVERAFTER Ltd | London | 2023 |
| 4EVERGREEN Technologies Limited | London | 2010 |
| 4EVERREADY Cleaning Services Limited | Harrow, Middlesex, | 2025 |
| 4EXMILITARY Jobs Ltd | Portsmouth | 2009 |
| 4FILL Europe Limited | Mayfield | 2021 |
| 4FILL Limited | St. Helens | 2020 |
| 4FRONT Recruitment Limited | Southampton | 2023 |
| 4FRONT Security Limited | Nottinghamshire | 2006 |
| 4FRONT Services Ltd | Basildon | 2007 |
| 4FUN Group Ltd | High Wycombe | 2017 |
| 4FX Design & Multimedia Limited | Milton Keynes | 2000 |
| 4G Consulting Ltd | Newark | 2024 |
| 4G Plant Hire Ltd | Lichfield | 2023 |
| 4G Water Limited | Titchfield | 2017 |
| 4GARDENS Service Ltd | Aberdeen | 2023 |
| 4GC Ltd | Bedfordshire | 1996 |
| 4GOLDFITNESS Ltd | London | 2025 |
| 4H Travel Limited | Bury | 2017 |
| 4HIREFM Ltd | Nottingham | 2021 |
| 4HIREFM Pbsa and Commercial Specialists Ltd | Nottingham | 2023 |
| 4HIREUK.COM Ltd | Wirral | 2019 |
| 4HOMES Trustees Limited | Sidmouth | 2022 |
| 4I Monitoring Services Ltd | London | 2024 |
| 4I Security (Acquisitions) Ltd | London | 2014 |
| 4I Ventures Limited | Milton Keynes | 2023 |
| 4ICG Ltd | Glasgow | 2018 |
| 4JD Limited | Bedford | 2013 |
| 4JS Holding Limited | Mansfield | 2020 |
| 4K Cleaning Services Ltd | London | 2026 |
| 4K Decor Limited | Portsmouth | 2024 |
| 4K Detailing and Valeting Services Ltd | Ely | 2020 |
| 4K2W Limited | London | 2025 |
| 4K7 Security Limited | Waltham Cross | 2026 |
| 4KINS Cleaning and Removal Service Ltd | London | 2025 |
| 4KS Forklift Training Ltd | Birmingham | 2018 |
| 4KSECURITY Ltd | Bingley | 2025 |
| 4L Cleaning Service Solutions Ltd | Leeds | 2025 |
| 4L Consultancy Ltd | Irby | 2024 |
| 4L Engineering Limited | Reading | 2013 |
| 4L Rocks Ltd | Prescot | 2024 |
| 4LANDSCAPE Ltd | Manchester | 2025 |
| 4LAW Recruitment Limited | London | 2017 |
| 4LEVEL1 Ltd | London | 2022 |
| 4LIFE Consultancy Ltd | London | 2016 |
| 4LIFE Research UK Limited | London | 2007 |
| 4LOGISTIC Limited | | 2006 |
| 4LR Ltd | Prescot | 2024 |
| 4LT Ltd | Cardiff | 2012 |
| 4LW Ltd | Wickford | 2023 |
| 4M Cats Limited | Enfield | 2003 |
| 4M Mirko E Marta Ltd | Potters Bar | 2014 |
| 4M Portable Buildings Hire Limited | Whitchurch | 1999 |
| 4M Recruitment Limited | Derby | 2022 |
| 4MACK'S Limited | Sevenoaks | 2015 |
| 4MARKETING Solutions Limited | Portsmouth | 2011 |
| 4MAT Data Solutions Ltd | Faversham | 2009 |