| ALL Under One Roof Enterprise Limited | London | 2025 |
| ALL Vape Limited | Watford | 2017 |
| ALL Vehicle Campers Ltd | Rugby | 2025 |
| ALL Venturi Equipment Limited | Stoke On Trent | 1986 |
| ALL Vessel Works Ltd | Shepton Mallet | 2025 |
| ALL Vision Limited | Beverley | 2019 |
| ALL Wales Garage Equipment Ltd | Llanon | 2016 |
| ALL Weather Conservatories & Windows Limited | Nottingham | 2016 |
| ALL Weather Trade Windows Limited | Leicester | 2016 |
| ALL Week Ltd | London | 2020 |
| ALL Weld Fabrications Ltd | Welling | 2020 |
| ALL West Collaborative Limited | Redruth | 2016 |
| ALL Wheel Drive Limited | London | 2015 |
| ALL World Pharmaceuticals Ltd | Southport | 2025 |
| ALL World Products Ltd | Bury St. Edmunds | 2019 |
| ALL YOU CAN Vape Limited | Stockton-On-Tees | 2018 |
| ALL YOU SEE Underwear Limited | Gateshead | 2022 |
| All-Gates UK Limited | Sittingbourne | 2013 |
| All-In-One Bargain Shop Limited | Luton | 2025 |
| All-Mechanics Limited | Leominster | 2009 |
| All-Pak Engineering Ltd. | Leeds | 2014 |
| All-Steak Limited | Edinburgh | 2025 |
| All-Tech (Midlands) Limited | Bromsgrove | 1999 |
| All-Tech Electrical&Mechanical Ltd | Peterborough | 2018 |
| All-Tech Electronics Ltd | Telford | 2023 |
| All-Tex Recyclers Limited | Ballymena | 2008 |
| All-Trades-In-One Ltd | London | 2018 |
| All-Weather Bespoke Carpentry Limited | Andover | 2019 |
| All-Wood Joinery and Design (Bristol) Ltd | Bristol | 2006 |
| ALL2CONSTRUCT Ltd | Harrow | 2024 |
| ALL4DOMESTICS Ltd | Chigwell | 2019 |
| ALL4HEALTH Lab(Uk) Ltd | Orpington | 2020 |
| ALL4LABELS UK Ltd | Leeds | 1993 |
| ALL4ONE Toy Limited | London | 2024 |
| ALL4TEC Industrial Services Limited | Bury | 2025 |
| Alla&Aksel Ltd | Gloucester | 2024 |
| Allabout Trade Windows Ltd | Shipley | 2018 |
| ALLABOUTGATESANDAUTOMATION2 Ltd | Romford | 2025 |
| Allabus Architectural Finishing Company Limited | London | 2000 |
| Allaggro Limited | Cradley Heath | 2014 |
| Allahmuhammad Ltd | London | 2016 |
| Allaice Ltd | West Drayton | 2025 |
| Allair Fabrications Limited | Romsey | 2010 |
| Allam Generators Limited | Hull | 2005 |
| Allam Power Limited | Hull | 1992 |
| Allamo Services Ltd | Birmingham | 2007 |
| Allan & Bertram Ltd | London | 2022 |
| Allan Austin Limited | Crystal Drive | 1949 |
| Allan Brothers Limited | Berwick-Upon-Tweed | 2006 |
| Allan Campbell GAS Services Ltd | Kelso | 2021 |
| Allan Contracting Services Ltd | Banbury | 2024 |
| Allan Doors Ltd. | Lanarkshire | 2004 |
| Allan Electrical (Thurso) Ltd | Thurso | 2014 |
| Allan European Contracting Limited | Bathgate | 2015 |
| Allan Ewing Limited | Belfast | 2021 |
| Allan Fabrication Ltd | Glasgow | 2019 |
| Allan Fuller Limited | Chepstow | 1951 |
| Allan Hayes Engineering Limited | East Grinstead | 1977 |
| Allan J Hargreaves Plant Engineers Limited | Thornton Cleveleys | 2005 |
| Allan Liddle (Steel) Limited | Pelaw Gateshead | 1978 |
| Allan Smith Designs Ltd | Aberdeen | 2021 |
| Allan Watkins Shutdown Work Limited | Redcar | 2017 |
| Allan Williamson Contractor Limited | Dingwall | 2023 |
| Allan's Services Construction Ltd | Perth | 2022 |
| Allanshaw Engineering Limited | Glasgow | 1998 |
| Allanwood Press Limited | Cleckheaton | 1963 |
| Allard Sports Cars Limited | Monmouth | 2012 |
| Allards International Limited | Arbroath | 2000 |
| Allards SRP Ltd | Arbroath | 2016 |
| Allarmed Limited | Thatcham | 2022 |
| Allaspectdoors Ltd | Newton Abbot | 2023 |
| Allauddin Jewellery Limited | Southall | 2014 |
| Allauddin Sweets Limited | London | 2011 |
| Allavare Ltd | Swansea | 2021 |
| Allaway Manufacturing Limited | Herts | 1987 |
| Allaxis Engineering Limited | Glasgow | 2015 |
| Allaya Ltd | Ilford | 2024 |
| Allbac Limited | Belfast | 2025 |
| Allbar Fittings and Fabrications Ltd | Bury | 2020 |
| Allbart Limited | Sheerness | 1974 |
| Allbase Group Ltd | Wakefield | 2015 |
| Allbatteries Limited | Solihull | 1992 |
| Allbelt (South Wales) Ltd | Merthyr Tydfil | 2010 |
| Allbike Spares Allbikeengineering Ltd | London | 2017 |
| Allbolts Limited | Stowmarket | 1998 |
| Allbooks Limited | Harrow | 2018 |
| Allbright Windows & Doors Sussex Limited | Bognor Regis | 2025 |
| Allbright Windows and Doors Ltd | Leigh-On-Sea | 2025 |
| Allbury Limited | Fareham | 2006 |
| Allclad Limited | Congleton | 2022 |
| Allcleanclear Ltd | Hounslow | 2025 |
| Allclear Glass & Glazing Limited | Hull | 2000 |
| Allcocks Sheds and Fencing Ltd | Nottingham | 2022 |
| Allcontrols Limited | Cambridge | 2003 |
| Allcreations Limited | Llanelli | 2025 |
| Allday Time Systems Limited | Farnborough | 2000 |
| Alldayengineering Ltd | Guisborough | 2025 |
| Alldayinc. Ltd | Wembley | 2025 |
| Allder Investments Limited | Clacton On Sea | 2019 |
| Allderwyne Ltd | Caterham | 2025 |