| AJN Plumbing Ltd | Huddersfield | 2017 |
| Ajocin Engineering Services Limited | Edinburgh | 1998 |
| AJP Innovations Limited | Usk | 2014 |
| AJP Planning Limited | Orpington | 2016 |
| AJP Renewables Limited | Newry | 2018 |
| AJP Storage Limited | Bolton | 2025 |
| AJR Computer Solutions Limited | Barrow In Furness | 2014 |
| AJR Cumbria Limited | Carlisle | 2023 |
| AJS Colour Creations Ltd | Wednesbury | 2025 |
| AJT Consult Limited | Enniskillen | 2023 |
| AJT Investment Management Ltd | Edinburgh | 2012 |
| AJT66 Ltd | Livingston | 2013 |
| Ajtl Ncube Care Ltd | Manchester | 2020 |
| Ajwa Travel Limited | Birmingham | 2022 |
| Ajwaa Traders Ltd | Ilford | 2012 |
| Ajwgsw Limited | Leicestershire | 2019 |
| AK Auto Care Limited | West Bromwich | 2015 |
| AK Consulting Sweden Limited | London | 2023 |
| AK DE P Limited | London | 2022 |
| AK Europe Corporation Limited | London | 2014 |
| AK Global Holdings Ltd | Taunton | 2023 |
| AK Good Group Limited | Kingston Upon Hull | 2022 |
| AK Hospitality Ltd | London | 2022 |
| AK Leasehold Ltd | Manchester | 2025 |
| AK Property (SW) Ltd | Bristol | 2021 |
| AK Trade Frames Limited | Wolverhampton | 2026 |
| AK47 Digital Productions Limited | Mansfield | 2022 |
| Akach Properties Ltd | Southend-On-Sea | 2024 |
| Akad Consulting Ltd | Bury St. Edmunds | 2024 |
| Akaibu Limited | Cardiff | 2017 |
| Akamai (COL) Limited | London | 2015 |
| Akamai (SA) Limited | London | 2014 |
| Akarsu Yachting Ltd | London | 2026 |
| Akasha Life Ltd | London | 2023 |
| AKC Global Education Ltd | London | 2024 |
| Akdeniz Yachting GB Limited | Blackpool | 2025 |
| AKE Brander Limited | London | 2014 |
| AKE Contracts Limited | Manchester | 2021 |
| Akeba Limited | Northampton | 2007 |
| Akeela ALI Financial Services Limited | Blackburn | 2022 |
| Akef Ltd | Brandon | 2023 |
| Akela Trust | Glasgow | 2013 |
| Akeo Limited | London | 2020 |
| Aker Marine & Offshore (UK) Limited | London | 2014 |
| Akethorpe Consultancy Services Limited | Lowestoft | 2016 |
| Akexa Investments Limited | London | 2011 |
| AKF Sports Coaching Limited | Carlisle | 2022 |
| Akfiler Materials Science Limited | Cardiff | 2019 |
| AKG London Limited | London | 2003 |
| AKG Marine Ltd | London | 2024 |
| AKG Media Limited | Southall | 2010 |
| AKG Science Support Limited | North Shields | 2017 |
| Akgun Ltd | London | 2023 |
| Akhand Kirtani Jatha UK Ltd | Burton-On-Trent | 2025 |
| Akhawaatt Ltd | London | 2024 |
| Akhu Ltd | Bristol | 2022 |
| Akhunzada Lettings Ltd | Nottingham | 2020 |
| AKI GRP Limited | Smethwick | 2011 |
| Akimeter Technology Co., Ltd | Cambridge | 2018 |
| Akin 1 Limited | Welling | 2020 |
| Akindex Limited | Smethwick | 2024 |
| Akinslameda Limited | Chatham | 2023 |
| Akisai Limited | Leeds | 2014 |
| Akischa Budd Productions Limited | London | 2022 |
| Akiseng Ltd | London | 2025 |
| Akka Trading Ltd | London | 2023 |
| Akkadia Company Limited | Chelsea Harbour | 2024 |
| AKL Support & Services Limited | Nottingham | 2022 |
| AKM Accountants Ltd | Burgess Hill | 2015 |
| Akofrimp Ltd | Swindon | 2025 |
| Akolii Ltd | London | 2024 |
| Akonelectrics Ltd | London | 2024 |
| Akos Gali Ltd | Rugby | 2023 |
| Akos Sweden Limited | London | 2022 |
| AKP Directors Limited | Horsham | 1998 |
| AKP Management Limited | Greater London | 2016 |
| AKP Secretaries Limited | Horsham | 1998 |
| AKQ Optom Ltd | Sheffield | 2024 |
| Akquis Limited | Salisbury | 2010 |
| Akram & Co Wealth Management Ltd | Hemel Hempstead | 2022 |
| Akram Ltd | Luton | 2024 |
| Akrep Holding Limited | London | 2026 |
| Akreyi Vekst & Invest Holding Limited | London | 2024 |
| Akreyi Vekst & Invest Limited | London | 2024 |
| Akronymion Productions Ltd | Barnet | 2014 |
| Aksa SU Limited | Stoke-On-Trent | 2018 |
| Akstex (XYH) Industrial Limited | Beckenham | 2017 |
| Akstylesuk Ltd | London | 2022 |
| AKT House Limited | London | 2024 |
| Akti Yachting Ltd | London | 2026 |
| Aktive Produkter Limited | London | 2021 |
| Aktivitetshjelpen Invest Limited | London | 2017 |
| Aktivum Ltd. | London | 2017 |
| Aktratus Studio Limited | London | 2021 |
| Aktu Media Global Ltd | London | 2018 |
| AKU Bebas Ltd | Manchester | 2022 |
| Akugi Property Sourcing Ltd | London | 2023 |
| Akurate Limited | Sandbach | 1995 |
| Akut Marketing Ltd | Wakefield | 2016 |
| Akvaty Performance Limited | Cardiff | 2019 |