| Asan Cars Limited | Wholesale & retail | 2023 |
| Asaoanu Investment Ltd | Real estate | 2026 |
| Asap Property Ltd | Real estate | 2024 |
| Asap Roofing & Guttering Ltd | Construction | 2025 |
| Asap Staffing Ltd | Administrative & support | 2018 |
| Asap Steel Installations Ltd | Other services | 2024 |
| Asawar Enterprise Limited | Wholesale & retail | 2022 |
| Asba Restaurant Ltd | Hospitality | 2018 |
| Ascend Portfolio Limited | Real estate | 2020 |
| Ascend Supply Ltd | Wholesale & retail | 2026 |
| Ascendental Ltd | Health & social care | 2024 |
| Ascenders Consulting Services Limited | Professional & scientific | 2012 |
| Ascensiune Limited | Financial services | 2025 |
| Ascot Group U.K. Limited | Construction | 2019 |
| Ascot Lets Ltd | Real estate | 2020 |
| ASD Hanusiak Ltd | Construction | 2021 |
| ASE Vertice Consultancy Limited | Other services | 2017 |
| Asedd Ltd | Wholesale & retail | 2026 |
| Asera Solutions Ltd | Information & communication | 2023 |
| Asghar Brothers Limited | Wholesale & retail | 2024 |
| ASH Beauty Spot Limited | Other services | 2026 |
| ASH Rainbow Ltd | Real estate | 2024 |
| Asha Halal Limited | Wholesale & retail | 2019 |
| Ashar Builders Limited | Construction | 2024 |
| Ashberry Services Limited | Education | 2022 |
| Ashby Roofing Property Maintenance Ltd | Construction | 2024 |
| Ashclinton Ltd | Mining & quarrying | 2019 |
| Ashcroft & Ramridge Tenants and Residents Limited | Education | 2003 |
| Ashcroft Barbers Ltd | Other services | 2024 |
| Ashcroft Carpets Limited | Construction | 2002 |
| Ashcroft Pharmacy Limited | Wholesale & retail | 2002 |
| Ashe Management Group Ltd | Wholesale & retail | 2022 |
| Ashee Ltd | Other services | 2025 |
| Ashfaq Limited | Transport & logistics | 2024 |
| Ashiyana Indian Luton Ltd | Hospitality | 2017 |
| Ashleigh House (Bedford) Management Company Limited | Real estate | 2004 |
| Ashleigh Rail Limited | Professional & scientific | 2020 |
| Ashley and Ashley Developments Limited | Construction | 2018 |
| Ashley Exler Limited | Households | 2025 |
| Ashna Private Limited | Wholesale & retail | 2025 |
| Ashraf Business Ltd | Professional & scientific | 2023 |
| Ashraf Legal Ltd | Professional & scientific | 2020 |
| Ashraf Real Estates Ltd | Real estate | 2023 |
| Ashrafhabimana Ltd | Health & social care | 2025 |
| Ashridge Estates Limited | Construction | 1994 |
| Ashridge Investments Limited | Real estate | 2009 |
| Ashton Carter Homes Limited | Real estate | 2018 |
| Ashton Carter Trading Ltd | Administrative & support | 2024 |
| Ashton Express (UK) Ltd | Wholesale & retail | 2011 |
| Ashton Gray Ltd | Real estate | 2023 |
| Ashton Michael Ltd | Manufacturing | 2021 |
| Ashtons Investments Ltd | Real estate | 2024 |
| Ashtree Howard Limited | Information & communication | 2004 |
| Ashur Properties Ltd | Hospitality | 2023 |
| Ashvic Care Limited | Health & social care | 2022 |
| ASI Trans Ltd | Transport & logistics | 2016 |
| ASI4 Construction Ltd | Construction | 2019 |
| Asia Coiffure Ltd | Other services | 2019 |
| Asia Touch Limited | Wholesale & retail | 2014 |
| Asian Observer Limited | Other services | 2024 |
| Asif Luxury Homes Ltd | Real estate | 2025 |
| Asim Peviani Ltd | Wholesale & retail | 2023 |
| ASJ Electrical Limited | Construction | 2019 |
| ASK Marketing & Accounting Services Limited | Professional & scientific | 2001 |
| ASK31 Ltd | Real estate | 2026 |
| Askaragha Fruit and VEG Ltd | Wholesale & retail | 2025 |
| Askari Prestige Chauffeurs Ltd | Transport & logistics | 2026 |
| Askum Limited | Professional & scientific | 2013 |
| Aslam Raza Real Estate Ltd | Real estate | 2025 |
| Aslq Limited | Hospitality | 2024 |
| ASM Expedition Ltd | Transport & logistics | 2025 |
| ASM Invest Ltd | Real estate | 2021 |
| ASM Mini Mart Ltd | Other services | 2023 |
| ASM Properties (Luton) Ltd | Real estate | 2018 |
| Asmat Brothers Limited | Wholesale & retail | 2021 |
| Asnk Limited | Professional & scientific | 2025 |
| Asons Group Ltd | Wholesale & retail | 2025 |
| ASP Construct Services Ltd | Construction | 2025 |
| ASP Coventry Properties Ltd | Real estate | 2024 |
| ASP Network Ltd | Construction | 2026 |
| ASP Plumbing and Heating Ltd | Construction | 2022 |
| Aspen Decorating Services Ltd | Construction | 2018 |
| Aspen Lloyd Estate Limited | Real estate | 2023 |
| Aspen Lloyd Sales and Letting Ltd | Real estate | 2026 |
| Aspire Aikido London Limited | Education | 2021 |
| Aspire Dentcare Limited | Health & social care | 2022 |
| Aspireonline Ltd | Wholesale & retail | 2018 |
| Asqalaani Ltd | Education | 2017 |
| ASR & Co UK Limited | Transport & logistics | 2021 |
| ASR Accounting Ltd | Professional & scientific | 2026 |
| ASR Fleets Ltd | Transport & logistics | 2024 |
| ASR Maintenance Group Ltd | Construction | 2019 |
| ASR Property Maintenance Limited | Other services | 2011 |
| Assacb Ltd | Transport & logistics | 2026 |
| Assessment Complete Services Ltd | Administrative & support | 2012 |
| Assetsteady Limited | Professional & scientific | 1967 |
| Assi Contraction Ltd | Real estate | 2025 |
| Assmark Service Ltd | Hospitality | 2020 |
| Associated Premium Funding Limited | Financial services | 2003 |
| Association of International Antiquities Dealers | Wholesale & retail | 2009 |