| Artitude Inc Ltd | Professional & scientific | 2024 |
| Artmo Experience Ltd | Information & communication | 2026 |
| Arts and Homelessness International | Arts & recreation | 2019 |
| Arts in the Workplace Ltd | Information & communication | 2025 |
| Arts LAB Ltd | Arts & recreation | 2024 |
| Artsid Ltd | Construction | 2011 |
| Artspiration Limited | Arts & recreation | 2014 |
| Arturo Smarts Ltd | Hospitality | 2014 |
| Arturs Trans Ltd | Administrative & support | 2013 |
| Arty - Folks | Health & social care | 2004 |
| Arty Entertainment Ltd | Hospitality | 2025 |
| Arum Limited | Administrative & support | 2016 |
| Arun Capital Ltd | Wholesale & retail | 2019 |
| Arun Energy Limited | Construction | 1987 |
| Aruna SAI Technologies Limited | Other services | 2017 |
| Aruna Traders Ltd | Wholesale & retail | 2025 |
| Arusuvai Express Ltd | Hospitality | 2021 |
| Aruth UK Ltd | Wholesale & retail | 2023 |
| Aruvi Express Ltd | Hospitality | 2022 |
| Aruvi Takeaway Ltd | Hospitality | 2016 |
| ARV House Ltd | Real estate | 2021 |
| Arvavi Tech Ltd | Information & communication | 2022 |
| Arvindson Capital Partners Ltd | Extraterritorial | 2021 |
| Arvor Group Ltd | Real estate | 2025 |
| Arwin Financial Limited | Financial services | 2026 |
| Ary&Bogdy Trans Limited | Extraterritorial | 2014 |
| Arya Property Ltd | Real estate | 2021 |
| Aryan Convenience Ltd | Wholesale & retail | 2014 |
| Aryan Foods Lichfield Ltd | Hospitality | 2025 |
| Aryans Minimart Limited | Wholesale & retail | 2013 |
| Aryvhi Food Ltd | Hospitality | 2025 |
| ARZ Haulage Ltd | Transport & logistics | 2025 |
| AS Anaesthesia Limited | Health & social care | 2022 |
| AS Chemicals Limited | Wholesale & retail | 2024 |
| AS Coventry Ltd | Professional & scientific | 2015 |
| AS Design Construct Ltd | Construction | 2026 |
| AS EV Solutions Ltd | Manufacturing | 2026 |
| AS Infratech Ltd | Construction | 2025 |
| AS LE22 Ltd | Hospitality | 2022 |
| AS Locksmith Ltd | Other services | 2024 |
| AS NG2 Ltd | Hospitality | 2022 |
| AS One Developments Limited | Construction | 2018 |
| AS One Holdings Limited | Financial services | 2018 |
| AS Property COV Limited | Real estate | 2022 |
| AS Tax & Law Ltd | Professional & scientific | 2026 |
| AS Transit Ltd | Transport & logistics | 2025 |
| As-Siraat Ltd | Other services | 2018 |
| ASA Contracting Limited | Professional & scientific | 2014 |
| ASA Contracts (North West) Limited | Construction | 2017 |
| ASA Homes Limited | Real estate | 2015 |
| ASA Property Management Ltd | Real estate | 2013 |
| Asaa Capital Ltd | Real estate | 2022 |
| Asad Capital Ltd | Wholesale & retail | 2025 |
| Asae Ltd | Professional & scientific | 2025 |
| Asahi Property Group Limited | Real estate | 2023 |
| Asante Property Consultancy Limited | Real estate | 2020 |
| Asaoa Ltd | Professional & scientific | 2022 |
| Asat Electricals Ltd | Wholesale & retail | 2025 |
| ASB (Kent) Limited | Wholesale & retail | 2013 |
| ASB Property Holdings Ltd | Real estate | 2024 |
| ASB Retail Ltd | Wholesale & retail | 2024 |
| ASC Eight Limited | Hospitality | 2013 |
| ASC Kent Ltd | Wholesale & retail | 2024 |
| ASC Sixteen Limited | Extraterritorial | 2016 |
| ASC Thirty Limited | Financial services | 2024 |
| ASC Thirty One Limited | Extraterritorial | 2025 |
| ASC Twenty Eight Limited | Extraterritorial | 2021 |
| ASC Twenty Nine Limited | Financial services | 2024 |
| ASC Twenty Three Ltd | Extraterritorial | 2020 |
| Asca Properties Ltd | Real estate | 2018 |
| Ascend People Limited | Administrative & support | 2017 |
| Ascend Sports Medicine Academy Community Interest Company | Health & social care | 2023 |
| Ascend Urban Infrastructure Development GH. Ltd | Administrative & support | 2026 |
| Ascent Business Group Ltd | Financial services | 2021 |
| Ascent Business Solutions Ltd. | Information & communication | 2017 |
| Ascent Onsite Group Ltd | Construction | 2022 |
| Ascent Onsite Services Ltd | Construction | 2020 |
| Ascent Partnerships Ltd | Financial services | 2026 |
| Ascent Stays Property Management Ltd | Real estate | 2026 |
| Ascot Property Developments Limited | Real estate | 2018 |
| Ascots Homes Ltd | Construction | 2021 |
| ASD Automotive Ltd | Wholesale & retail | 2024 |
| ASD Luxe Homes Ltd | Real estate | 2022 |
| ASD Motors Ltd | Wholesale & retail | 2020 |
| ASD Smiles Ltd | Financial services | 2022 |
| ASE Transit Ltd | Transport & logistics | 2025 |
| Ase&Building Ltd | Manufacturing | 2013 |
| Asended Ltd | Education | 2026 |
| ASF Land and Developments Limited | Real estate | 2017 |
| ASG Assets Ltd | Real estate | 2020 |
| ASG Heritage Ltd | Wholesale & retail | 2022 |
| ASG Precision Limited | Professional & scientific | 2021 |
| Asghar Enterprises Limited | Administrative & support | 2010 |
| Asghar Property Partners Ltd | Professional & scientific | 2026 |
| ASH Advisory Ltd | Professional & scientific | 2025 |
| ASH Green Cattery Limited | Other services | 2022 |
| ASH Londonx Ltd | Wholesale & retail | 2020 |
| ASH Managment Ltd | Real estate | 2020 |
| ASH Resources Limited | Professional & scientific | 1984 |
| ASH Staffing Solutions Limited | Health & social care | 2015 |