| Artisan Services Limited | Manufacturing | 2019 |
| Artistic Intl Ltd | Wholesale & retail | 2024 |
| Artistry Loyal Ltd | Other services | 2008 |
| Artisty Ltd | Wholesale & retail | 2015 |
| Artlight Ltd | Construction | 2014 |
| Artois Investments Ltd | Administrative & support | 2023 |
| Arts Astron Ltd | Information & communication | 2025 |
| ARTS4HEALTH & Wellness CIC | Education | 2024 |
| Artur Delivery Ltd | Construction | 2020 |
| Artwood Contracts Limited | Construction | 2012 |
| Arun Accounts & Tax Ltd | Professional & scientific | 2022 |
| Arunan Accountants Limited | Professional & scientific | 2022 |
| Arunan Holdings Ltd | Financial services | 2026 |
| Arunan Property Investments Limited | Real estate | 2025 |
| Arushay Investments Ltd | Financial services | 2020 |
| Arvin Construction Ltd | Construction | 2024 |
| Arvin Investments Ltd | Real estate | 2025 |
| ARX Price & Time Ltd | Wholesale & retail | 2023 |
| Arya Health & Beauty Ltd | Other services | 2026 |
| Aryak Properties Ltd | Real estate | 2023 |
| Aryana Travel Ltd | Administrative & support | 2022 |
| Aryman Ltd | Construction | 2026 |
| AS & Sons Investments Ltd | Real estate | 2021 |
| AS BAL Property Limited | Real estate | 2021 |
| AS Carpentry London Ltd | Construction | 2019 |
| AS Code UK Ltd | Information & communication | 2024 |
| AS Development London Ltd | Construction | 2024 |
| AS Global Trading Ltd | Wholesale & retail | 2019 |
| AS Investors Group Limited | Real estate | 2023 |
| AS Talk Ltd | Wholesale & retail | 2023 |
| ASA Cloud Solutions Ltd | Information & communication | 2021 |
| Asadworks Ltd | Wholesale & retail | 2025 |
| Asap Catering Limited | Administrative & support | 2007 |
| Asar Tech Solutions Limited | Information & communication | 2021 |
| ASB Tech Consulting Ltd | Information & communication | 2020 |
| Ascend IT Consult Ltd | Information & communication | 2025 |
| Ascension Office Limited | Wholesale & retail | 2024 |
| Ascension-Q Limited | Information & communication | 2017 |
| Ascent Partners Ltd | Wholesale & retail | 2024 |
| Ascentia Outdoors Ltd | Wholesale & retail | 2024 |
| Ascento Facilitation Limited | Administrative & support | 2012 |
| Ascot Sealant Limited | Construction | 1997 |
| ASD Organics Ltd | Wholesale & retail | 2025 |
| Asdak Consultancy Limited | Other services | 2024 |
| ASF Cargo Ltd | Transport & logistics | 2025 |
| ASF Trading Limited | Wholesale & retail | 2015 |
| ASH Accountancy Services Limited | Professional & scientific | 2025 |
| ASH Real Estate Ltd | Real estate | 2025 |
| Asha Capitals Limited | Real estate | 2021 |
| Asha Reddy Ltd | Health & social care | 2024 |
| Ashbe Ltd | Manufacturing | 2020 |
| Ashchris Limited | Health & social care | 2022 |
| Ashforce Ltd | Information & communication | 2013 |
| Ashi & Abina Ltd | Real estate | 2026 |
| Ashkim Property Limited | Real estate | 2020 |
| Ashkumar Properties Ltd | Real estate | 2022 |
| Ashlar Global Group Ltd | Other services | 2025 |
| Ashok DEV Properties Ltd | Real estate | 2024 |
| Ashton & Perkins Limited | Real estate | 2013 |
| Ashton (Estate Agency) Limited | Real estate | 1991 |
| Ashvale Building and Landscapes Limited | Construction | 2018 |
| Ashvin Property Management Ltd | Real estate | 2021 |
| Ashwood Props Ltd | Arts & recreation | 2022 |
| Ashworth Property Management Ltd | Real estate | 2014 |
| ASI Bros Ltd | Hospitality | 2024 |
| ASI Desserts Ltd | Hospitality | 2025 |
| Asiama Willie Ltd | Health & social care | 2024 |
| Asian Events Limited | Hospitality | 2025 |
| Asian Investment Ltd | Hospitality | 2019 |
| Asian Spice Romford Limited | Hospitality | 2018 |
| Asilla Furniture Ltd | Wholesale & retail | 2026 |
| Asimor Properties Ltd | Real estate | 2025 |
| Asiper Limited | Wholesale & retail | 2018 |
| Asiri Enterprises Limited | Wholesale & retail | 2016 |
| ASK Financial Solutions Ltd | Financial services | 2025 |
| ASK Ventures Group Ltd | Wholesale & retail | 2026 |
| ASL Retail Ltd | Wholesale & retail | 2024 |
| Asllani Decorations Ltd | Construction | 2022 |
| ASM Home Development Ltd | Construction | 2024 |
| ASM Property Holdings Ltd | Real estate | 2025 |
| ASN Global Ltd | Transport & logistics | 2017 |
| ASO Global Expressions Ltd | Wholesale & retail | 2025 |
| Asombroso Ltd | Professional & scientific | 2019 |
| ASP Capital Ltd | Financial services | 2023 |
| Aspect Press Limited | Other services | 1995 |
| Aspirant Technologies Ltd | Information & communication | 2026 |
| Aspirare Solutions Limited | Manufacturing | 2015 |
| Aspire Global Solutions Ltd | Administrative & support | 2024 |
| Aspire Medics Limited | Health & social care | 2014 |
| Aspire Training & Enterprise Limited | Education | 2011 |
| Aspire Vision Ltd | Real estate | 2025 |
| Asquare Consultants Ltd | Professional & scientific | 2022 |
| ASR and Co Services Ltd | Manufacturing | 2023 |
| ASR Security Limited | Administrative & support | 2024 |
| ASR Services Limited | Wholesale & retail | 2024 |
| ASR Shopfront Limited | Construction | 2024 |
| Asra KRD Ltd | Wholesale & retail | 2025 |
| Asrak Ltd | Real estate | 2025 |
| Asrix Media Limited | Information & communication | 2025 |
| Assador Glazing Limited | Construction | 2026 |