| AK Properties Holding Ltd | Real estate | 2025 |
| AK Residential Ltd | Real estate | 2019 |
| AK Spares Huddersfield Ltd | Wholesale & retail | 2026 |
| AK6 CHS Limited | Construction | 2025 |
| AK6 JW Limited | Construction | 2025 |
| AK6 Limited | Wholesale & retail | 2024 |
| AK6 NU Limited | Construction | 2025 |
| Akasha Properties Ltd | Real estate | 2024 |
| Akb-Envirobuild Limited | Real estate | 2015 |
| Akbari Consulting Ltd | Real estate | 2026 |
| Akbary Properties Limited | Real estate | 2025 |
| Akhter-Clogworks Services Limited | Information & communication | 2018 |
| Akhter-Clogworks Technologies Limited | Manufacturing | 2014 |
| Akinom Logistics Ltd | Transport & logistics | 2025 |
| Akkadia Corporation Limited | Hospitality | 2017 |
| Akkr Partners Limited | Public administration | 2024 |
| Akky the Plug Ltd | Administrative & support | 2026 |
| Aklr Ltd | Health & social care | 2019 |
| Aklr Properties Ltd | Real estate | 2024 |
| AKLR2 Ltd | Health & social care | 2024 |
| AKN Consultancy Limited | Professional & scientific | 2018 |
| Akollo Care Ltd | Health & social care | 2026 |
| Akosmedics Ltd | Wholesale & retail | 2025 |
| Akroyd Properties Ltd | Real estate | 2026 |
| Akshar Amrut Properties Ltd | Real estate | 2025 |
| Aktiv Learning Ltd | Education | 2020 |
| AL Amine Cars Ltd | Transport & logistics | 2023 |
| AL AYN Trading Ltd | Wholesale & retail | 2023 |
| AL Courier Services Limited | Transport & logistics | 2015 |
| AL Fatah Travel Ltd | Transport & logistics | 2026 |
| AL Ittihaf Ltd | Wholesale & retail | 2020 |
| AL NUR Global Ltd | Wholesale & retail | 2023 |
| AL Ophthalmic Services Ltd | Health & social care | 2014 |
| AL Quds Food Stuff Ltd | Hospitality | 2021 |
| AL Rashid Properties Ltd | Real estate | 2022 |
| AL Sadiqah Limited | Wholesale & retail | 2023 |
| AL Tabuk Foods Ltd | Hospitality | 2025 |
| AL Warith Marketing Ltd | Wholesale & retail | 2025 |
| AL Yousaf Halal Meat Ltd | Wholesale & retail | 2022 |
| Al-Aakhir Ltd | Wholesale & retail | 2023 |
| Al-Amin Enterprise Ltd | Wholesale & retail | 2023 |
| Al-Amin Global Ltd | Wholesale & retail | 2021 |
| Al-Barr Investments Limited | Wholesale & retail | 2023 |
| Al-Madinah Tradings Ltd | Wholesale & retail | 2020 |
| AL8 Limited | Other services | 2015 |
| ALA Yorkshire Limited | Health & social care | 2010 |
| Alace Development Ltd | Real estate | 2025 |
| Alamk Ltd | Real estate | 2023 |
| Alan Lewis Foundation (UK) | Other services | 2016 |
| Alan Lewis Global Foundation | Other services | 2016 |
| Alastair Hanson Limited | Financial services | 2009 |
| Alaya Tradings UK Ltd | Wholesale & retail | 2021 |
| Albatross Housing Limited | Real estate | 2025 |
| Albatross Payment Solutions Ltd | Professional & scientific | 2025 |
| Albert Tattersall Limited | Construction | 1969 |
| Albertyard Ltd | Hospitality | 2026 |
| Albion Crystallisation Limited | Professional & scientific | 2013 |
| Albion Street Studios Limited | Real estate | 2021 |
| Alchemy MCR Ltd | Other services | 2024 |
| Alda Holdings Limited | Financial services | 1999 |
| ALDAEM212 Ltd | Wholesale & retail | 2024 |
| Alder Joinery Contractors Ltd | Construction | 2024 |
| Alder Specialist Joinery Ltd | Construction | 2022 |
| Alderley Home Care Limited | Health & social care | 2026 |
| Alderson Developments (Yorkshire) Ltd | Construction | 2024 |
| Aldridge Farms Ltd | Agriculture & fishing | 2014 |
| Alec Stonehouse Limited | Professional & scientific | 2002 |
| Aleem Enterprises Limited | Wholesale & retail | 2026 |
| Alessio's Italian Ltd | Hospitality | 2024 |
| Alethos Business Solutions Ltd | Professional & scientific | 2025 |
| Aletrack Limited | Arts & recreation | 2006 |
| Alex Batchelor Limited | Professional & scientific | 2020 |
| Alexan Engineering Services Limited | Construction | 2018 |
| Alexander and Hogg Ltd | Professional & scientific | 2011 |
| Alexandra Chambers Ltd | Wholesale & retail | 2020 |
| Alexandra House Holistic Health and Well-Being Spa Limited | Other services | 2011 |
| Alexandra Louise Limited | Real estate | 2025 |
| Alexandra West Estates Limited | Real estate | 2023 |
| Alexv&Co Ltd | Transport & logistics | 2024 |
| Aleyah House Ltd | Real estate | 2021 |
| ALF ALF Ltd | Wholesale & retail | 2023 |
| Alfa JMA Properties Ltd | Real estate | 2025 |
| Algochem Limited | Manufacturing | 2008 |
| ALI Karim Ltd | Wholesale & retail | 2025 |
| ALI Murad Breakfast & Grill Ltd | Hospitality | 2023 |
| ALI Optical Company Limited | Health & social care | 2019 |
| ALI Seller Ltd | Wholesale & retail | 2023 |
| ALI Zamam Farms Ltd | Agriculture & fishing | 2021 |
| Alice Beauty Ltd | Other services | 2015 |
| Alice Security Limited | Administrative & support | 2021 |
| Alicemirza Ltd | Wholesale & retail | 2026 |
| Alife Property Ltd | Real estate | 2025 |
| Alignmark Limited | Administrative & support | 1988 |
| Aliom Investments Limited | Administrative & support | 2024 |
| Alisa Services Ltd | Real estate | 2016 |
| Alithia Trading Ltd | Wholesale & retail | 2022 |
| Aliwaq Properties Ltd | Real estate | 2023 |
| Aliza Holding Ltd | Financial services | 2025 |
| Alkemygold Limited | Education | 2001 |
| ALL Creative Enterprises Ltd | Information & communication | 2015 |