| Akong London Ltd | London | 2010 |
| Akos Agro Limited | Sutton | 2025 |
| Akossi Ltd | London | 2023 |
| Akosystems Limited | Stourbridge | 1994 |
| AKP Atelier Ltd | London | 2025 |
| AKP Carpentry Ltd | Southwater, Horsham | 2021 |
| AKP Electrical & Plumbing Limited | Coventry | 2021 |
| AKP Limited | Lowestoft | 2015 |
| Akprettypudsnewport Ltd | Newport | 2024 |
| Akram Steel Limited | Manchester | 2024 |
| Akramatic Engineering Co. Limited | Alfreton | 1967 |
| Akreon Cell Ltd | Edinburgh | 2025 |
| Akreon Technology Ltd | Birmingham | 2021 |
| Akri Sports Ltd | London | 2020 |
| Akro Valve Limited | Polegate | 2002 |
| Akrolimb Ltd | Hounslow | 2026 |
| Akropolis Imports Merseyside Ltd | Prescot | 2010 |
| Akror Events Ltd | London | 2019 |
| AKS Heat Transfer Limited | Sheffield | 2012 |
| AKS Holdings (Cheshire) Limited | Crewe | 2025 |
| AKS Machining Limited | Crewe | 1996 |
| AKS Mechanical Designs Limited | Chester | 2017 |
| AKS North West Ltd | Warrington | 2010 |
| AKS Precision Ball Europe Limited | London | 1989 |
| Aksa International (UK) Limited | Coalville | 1998 |
| Akshar Electric Ltd | Stanmore | 2025 |
| Akshutters Ltd | Waterlooville | 2018 |
| Aksi LIT Ltd | Edinburgh | 2025 |
| Aksmw Ltd | Warrington | 2025 |
| Akstephenson Contractors Ltd | Middlesbrough | 2026 |
| Aksu Shutters Ltd | London | 2023 |
| AKT Engineering Limited | Runcorn | 1991 |
| AKT London Ltd | London | 2018 |
| AKT Roller Shutters Ltd | Swansea | 2023 |
| Aktinium Technologies Limited | Bushey | 2015 |
| Aktisfon Ltd | Edgware | 2018 |
| Aktium Group Limited | London | 2025 |
| Aktiv Design (Marble and Granite) Limited | Harrogate | 2003 |
| Aktiva Systems Limited | Thame | 1988 |
| Aktive Box Professional Ltd | Uttoxeter | 2024 |
| Akturk Handyman Services Ltd | London | 2020 |
| Akula Living Limited | Wetherby | 2016 |
| Akuma Signs Ltd | Upper Ballinderry | 2022 |
| Akuma Sports Ltd. | Kenilworth | 2008 |
| Akura Healthtech Ltd | London | 2026 |
| Akushi Group Limited | London | 2025 |
| Akuturn Limited | Accrington | 2014 |
| AKV Architectural Facades Limited | Shildon | 2016 |
| AKV Cladding Products Ltd | Shildon | 2011 |
| AKV Global Limited | London | 2017 |
| Akva Group Scotland Ltd | Inverness | 1997 |
| Akvemtek Engineering and Valve Ltd | Enfield | 2023 |
| Akville Ltd | London | 2016 |
| AKW Marine Limited | Largs | 2023 |
| Akwaaba Village Limited | London | 2021 |
| Akwel Birmingham UK Limited | Chippenham | 1997 |
| Akwel Chippenham UK Limited | Bumpers Farm Chippenham | 2006 |
| AKY Snuggle Beds UK Ltd | Accrington | 2016 |
| Akyapak UK Ltd | London | 2024 |
| Akyn Studio Limited | Southend-On-Sea | 2021 |
| Akyuz Electrical Solutions and Consultancy Ltd | Workington | 2021 |
| AKZ Timber Limited | Tonbridge | 2009 |
| Akzo Nobel Aerospace Coatings Limited | Slough | 1968 |
| Akzo Nobel Coatings Limited | Slough | 1995 |
| Akzo Nobel Industrial Coatings Limited | Slough | 1991 |
| Akzo Nobel Packaging Coatings Limited | Slough | 1898 |
| Akzo Nobel Powder Coatings Limited | Slough | 1983 |
| Ak’S Creations Ltd | Helston | 2025 |
| AL & AF Foods Limited | Exeter | 2022 |
| AL - Mateen Limited | Birmingham | 2024 |
| AL Aaraf BIN Azad Trading & Contracting Limited | London | 2025 |
| AL Abbar UK Limited | London | 2021 |
| AL Abdalla Ltd | London | 2025 |
| AL Abwa Ltd | London | 2023 |
| AL Aero Ltd | Glasgow | 2020 |
| AL Afdal Tobacco Limited | London | 2021 |
| AL Agri Limited | Forfar | 2016 |
| AL Ahmadi Trading Ltd | London | 2020 |
| AL Air Aviation Limited | Chester | 1995 |
| AL Alamein Water Technology AWT Ltd | Manchester | 2026 |
| AL Araha Ltd | London | 2025 |
| AL Arsa Limited | Luton | 2025 |
| AL ASR DOT Ltd | Manchester | 2023 |
| AL Aviation Contracts Ltd | Comber | 2024 |
| AL Barakah Meats Ltd | Leicester | 2016 |
| AL Boulton & SON Ltd | Stoke-On-Trent | 2002 |
| AL Bright Dental Ltd | Newcastle Upon Tyne | 2023 |
| AL Carpentry and Glazing Ltd | Barry | 2019 |
| AL Carpentry&Joinery Ltd | Romford | 2020 |
| AL Clean Ltd | London | 2023 |
| AL Composites Ltd | Cambridge | 2023 |
| AL Electrical Services Limited | Hull | 2015 |
| AL Eman Global Ltd | London | 2025 |
| AL Enam Ltd | London | 2009 |
| AL Fabrications Limited | Wolverhampton | 2006 |
| AL Fajer Trading Ltd | Leicester | 2018 |
| AL Fakhama Union Trading Company Ltd | London | 2025 |
| AL Gawas UK Ltd | Manchester | 2024 |
| AL Halal Prime Meat Ltd | Birmingham | 2023 |
| AL Hamdan Ltd | London | 2026 |