| AS International Corporation Ltd | Professional & scientific | 1976 |
| AS Properties Northwest Limited | Real estate | 2024 |
| AS Property Sales Ltd | Real estate | 2007 |
| AS Roller Shutters Ltd | Manufacturing | 2025 |
| AS Solutions Ltd | Wholesale & retail | 2025 |
| AS Support Services Ltd | Education | 2022 |
| AS Wealth Ltd | Other services | 2025 |
| AS YOU Wear Ltd | Wholesale & retail | 2025 |
| As-Sultany Surgical Care Limited | Health & social care | 2024 |
| As-Technical Ltd | Professional & scientific | 2015 |
| ASA Gardens Ltd | Administrative & support | 2019 |
| ASA Transport Limited | Transport & logistics | 2025 |
| ASA UK & Ireland Limited | Manufacturing | 2000 |
| Asabaav Ltd | Education | 2020 |
| Asaco Limited | Financial services | 2025 |
| Asaf Niaz Holdings Limited | Financial services | 2012 |
| Asah Newsagents Ltd | Wholesale & retail | 2019 |
| Asap Care UK Limited | Health & social care | 2025 |
| Asap Transportation Ltd | Transport & logistics | 2025 |
| Asbal Investment Ltd | Real estate | 2023 |
| Asbestos Control and Treatment Limited | Water & waste | 1999 |
| Asbestos Northwest Consultants Ltd | Water & waste | 2016 |
| Asbestos Surveying Services & Electrical Testing Limited | Construction | 2011 |
| Asbuild Limited | Construction | 2024 |
| ASC INT Ltd | Professional & scientific | 2020 |
| ASC LP | | 2012 |
| ASC MIX Concrete and Grab Hire Limited | Transport & logistics | 2017 |
| ASC Property Limited | Real estate | 2021 |
| ASC Retail Limited | Wholesale & retail | 2014 |
| Asca Private Ltd | Financial services | 2018 |
| Ascari Properties Limited | Real estate | 2019 |
| Ascend Access Services Limited | Construction | 2026 |
| Ascend Bathrooms Ltd | Construction | 2023 |
| Ascend Football Limited | Education | 2026 |
| Ascend Rope Access Ltd | Construction | 2021 |
| Ascend Site Services Limited | Administrative & support | 2026 |
| Ascending N W Ltd | Real estate | 2024 |
| Ascendis Asset Management Limited | Real estate | 2020 |
| Ascendis Property Limited | Hospitality | 2020 |
| Ascendiumi Ltd | Professional & scientific | 2024 |
| Ascension Alliance Ltd | Professional & scientific | 2025 |
| Ascension Associates Ltd | Professional & scientific | 2021 |
| Ascension Executive Search Ltd | Administrative & support | 2011 |
| Ascension Investments Limited | Real estate | 2013 |
| Ascension Powerlifting Ltd. | Education | 2024 |
| Ascent Automotive Limited | Professional & scientific | 2023 |
| Asco Trans Ltd | Transport & logistics | 2018 |
| Ascorp Group Limited | Real estate | 2018 |
| Ascot Architectural Glazing Limited | Construction | 2014 |
| Ascot Carr House Lane Limited | Real estate | 2025 |
| Ascot Construction & Developments Limited | Construction | 2024 |
| Ascot Court (Waterloo) Management Limited | Households | 2008 |
| Ascot Court (Woolton) RTM Company Ltd | Households | 2012 |
| Ascot Design Consultancy Limited | Professional & scientific | 2024 |
| Ascot Developments Group Limited | Households | 2008 |
| Ascot Elite Homes Formby Limited | Real estate | 2020 |
| Ascot Estates Management & Sales Limited | Construction | 2019 |
| Ascot Group Investment Company Limited | Extraterritorial | 2012 |
| Ascot Group Shorrocks Hill Limited | Real estate | 2022 |
| Ascot Group SPV 001 Limited | Real estate | 2022 |
| Ascot Homes Formby Limited | Real estate | 2024 |
| Ascot Homes Liverpool Limited | Real estate | 2003 |
| Ascot Industrial Investments Limited | Real estate | 2025 |
| Ascot Investments Liverpool Limited | Real estate | 2021 |
| Ascot Liverpool One Limited | Real estate | 2019 |
| Ascot Liverpool Towers Limited | Real estate | 2018 |
| Ascot Luxury Living Limited | Construction | 2002 |
| Ascot Properties Ainsdale Limited | Real estate | 2025 |
| Ascot Properties Southport Limited | Real estate | 2025 |
| Ascot Properties UK Limited | Real estate | 1996 |
| Ascot Property Group LLP | | 2016 |
| Ascot Towers Southport Limited | Real estate | 2013 |
| Ascot UK Capital Limited | Financial services | 2025 |
| Ascot Waterloo Limited | Real estate | 2012 |
| Ascotorbs Limited | Extraterritorial | 2012 |
| ASD Constructions and Renovations Ltd | Construction | 2025 |
| ASD Liverpool Ltd | Real estate | 2015 |
| ASD Next GEN Limited | Arts & recreation | 2023 |
| ASD Supply Limited | Professional & scientific | 2012 |
| ASD10 Sports Ltd | Arts & recreation | 2023 |
| Asdiss Ltd | Wholesale & retail | 2017 |
| Aseda Nkoaa Company Limited | Health & social care | 2018 |
| Aseel News Limited | Wholesale & retail | 2024 |
| Asen Electrical Ltd | Construction | 2025 |
| Asep Healthcare Limited | Manufacturing | 2008 |
| Aser Production Limited | Other services | 2025 |
| ASF Securites Limited | Administrative & support | 2022 |
| ASF Trade & Services Ltd | Construction | 2025 |
| ASG Vehicle Technician UK Ltd | Wholesale & retail | 2024 |
| Asgard Investments | Real estate | 2004 |
| Asghar 786 Ltd | Wholesale & retail | 2025 |
| ASH and the Asthmatic Vegetarian Limited | Professional & scientific | 2014 |
| ASH Building & Contracting Ltd | Construction | 2015 |
| ASH Loans Limited | Financial services | 2006 |
| Asha Balti House Bangladeshi Restaurant & Takeaway Ltd | Hospitality | 2024 |
| Ashaeve Holdings Limited | Financial services | 2021 |
| Ashaeve Limited | Professional & scientific | 2006 |
| Ashbrook Office Park Management Company Limited | Real estate | 2008 |
| Ashburton Academy Limited | Administrative & support | 2021 |
| Ashburton Manorial Management Limited | Real estate | 2002 |