| 4DTECH Ltd | Birmingham | 2024 |
| 4DVIDEO Limited | Witney | 2006 |
| 4E Products Limited | Didcot | 2013 |
| 4EDGE Limited | Hockley | 2003 |
| 4EVERFUELS Ltd | Walsall | 2022 |
| 4FAB Limited | Cheddar | 2005 |
| 4FABRICATIONS & Welding Limited | Burton On Trent | 2007 |
| 4FORTHECULTURE. Ltd | Camberley | 2024 |
| 4FR Limited | Chichester | 2006 |
| 4FRONT Electrical Ltd | Bracknell | 2016 |
| 4G Joinery Ltd | Wetherby | 2020 |
| 4G Kitchens Ltd | Pulborough | 2018 |
| 4GB Aviation Services Ltd | Middlesbrough | 2024 |
| 4GD Limited | London | 2016 |
| 4H Projects Ltd | Stockport | 2020 |
| 4I Ltd | London | 2025 |
| 4I Pumping Services Limited | Bury St Edmunds | 2019 |
| 4IN Holdings Limited | Chatham | 2020 |
| 4INDEPENDENTS Ltd | Ledbury | 2002 |
| 4K Manufacturing Ltd | Fraserburgh | 2023 |
| 4K Tyres Ltd | Wigan | 2024 |
| 4K With Love Ltd | Wembley | 2020 |
| 4K'S Kitchens Ltd | Nottingham | 2018 |
| 4KICKS Productions Ltd | London | 2018 |
| 4L (UK) Ltd | Bristol | 2013 |
| 4LINKS Limited | Milton Keynes | 2000 |
| 4LS Ventures Ltd | Glasgow | 2026 |
| 4M Diamonds Limited | Belfast | 2025 |
| 4M Earthing Solutions Ltd | Grantown On Spey | 2023 |
| 4M Garage Equipment Ltd | Newhaven | 2026 |
| 4M Interior Solutions Ltd | Hitchin | 2021 |
| 4MATIC Delta Limited | Immingham | 2019 |
| 4MB Skin Ltd | London | 2021 |
| 4MEASUREMENT Limited | Henley-On-Thames | 1997 |
| 4MOON Windows Ltd | Croydon | 2024 |
| 4MP Global Ltd | London | 2025 |
| 4MP Ltd | London | 2025 |
| 4MP Technologies Limited | Chichester | 2020 |
| 4NG Limited | Caterham-On-The-Hill | 2017 |
| 4NINE Trading Limited | Northampton | 2016 |
| 4OCEAN Limited | Ashton-Under-Lyne | 2005 |
| 4ONSTUDIOS Ltd | London | 2018 |
| 4P Management and Media Ltd | London | 2024 |
| 4PANELS Limited | Market Rasen | 2011 |
| 4PMPRINT Ltd | Portsmouth | 2009 |
| 4PROTECH Limited | Rotherham | 2014 |
| 4QD Limited | St Ives | 2014 |
| 4R Holdings Limited | Nuneaton | 2020 |
| 4REE Ltd | Nottingham | 2026 |
| 4RS Recycling C.I.C. | Racecourse Road | 1991 |
| 4RTY Ltd | Larkhall | 2021 |
| 4SB Mobility Ltd | Dundee | 2022 |
| 4SEASONS Blinds & Awnings Ltd | Warwick | 2008 |
| 4SEASONS Joinery Limited | London | 2025 |
| 4SEASONSGRIND Ltd | London | 2023 |
| 4SITE Hoardings, Signs & Fabrication Limited | Basildon | 2011 |
| 4SITE Implementation Limited | Laindon | 2006 |
| 4SURE Solutions Ltd | Corby | 2006 |
| 4TEK Electronics Limited | Southampton | 2024 |
| 4TF Ltd | Bootle | 2018 |
| 4TH Spot Limited | Northwood Hills | 2026 |
| 4TMETALS Limited | Peckham | 2019 |
| 4TRESS4GATES Ltd | Birmingham | 2006 |
| 4U Bedroom and Kitchens Ltd | Harrow | 2026 |
| 4U Fresh Produce Ltd | London | 2017 |
| 4U Industry Co., Limited | London | 2011 |
| 4VVVV Limited | Kendal | 2017 |
| 4WOOD Joinery (London) Limited | Longfield | 2017 |
| 4X4 Durham Ltd | Bowburn | 2015 |
| 4YAKHA Brothers Ltd | Colchester | 2025 |
| 4YOU Builders Ltd | London | 2025 |
| 5 Axis Ltd | High Peak | 2003 |
| 5 Axis Routing Limited | Coventry | 2018 |
| 5 Bean Blue Mountain Limited | London | 2022 |
| 5 Boroughs Lubricants Ltd. | Newark | 2014 |
| 5 Digital Ltd | Tetbury | 2020 |
| 5 Greens Supplements UK Ltd | London | 2024 |
| 5 Lads Group T/A MAH Skirting Shop & Joinery Ltd | London | 2021 |
| 5 Loaves U.K Ltd | Aberdeen | 2026 |
| 5 Sigma Ltd | Hyde | 2022 |
| 5 Signature Kitchens Ltd | Southall | 2025 |
| 5 Spice Foods Ltd | Bristol | 2019 |
| 5 Squirrels Ltd | Hove | 2014 |
| 5 St*R Ltd | London | 2021 |
| 5 Star Beds Ltd | Dewsbury | 2017 |
| 5 Star Cases Limited | Wisbech | 1992 |
| 5 Star Cups Limited | Bury | 2008 |
| 5 Star Desk Ltd | Watford | 2024 |
| 5 Star GAS and Electrical Services Ltd | Ingoldmells | 2020 |
| 5 Star Group Holdings Limited | Wisbech | 2008 |
| 5 Star Kitchens (NI) Ltd | Coleraine | 2021 |
| 5 Star Microwaves Limited | Oldham | 2026 |
| 5 Star Mobility Ltd | Montrose | 2026 |
| 5 Star Plastics Ltd | Camberley | 2023 |
| 5 Star Tools UK Limited | Cheadle | 2023 |
| 50 Electric Bikes Ltd. | Loughborough | 2019 |
| 5000 Bananas Ltd | Altrincham | 2024 |
| 501 Vent Ltd | Woking | 2024 |
| 508 Degrees North Limited | Fareham | 2019 |
| 50HZ Electrical Limited | Reading | 2024 |