| Ashley Sutcliffe Holding Ltd | Financial services | 2024 |
| Ashmade Food Ltd | Hospitality | 2025 |
| Ashmita Limited | Health & social care | 2021 |
| Ashok Optical Limited | Health & social care | 2020 |
| Ashtech Talent Ltd | Administrative & support | 2023 |
| Ashton Contracting Services Limited | Other services | 2010 |
| Ashton K Ltd | Other services | 2025 |
| Ashton Kennedy Fire Engineering Ltd | Real estate | 2023 |
| Ashton Newsagents Ltd | Wholesale & retail | 2018 |
| Ashton Old Road Limited | Real estate | 2021 |
| Ashton Optical Ltd | Wholesale & retail | 2026 |
| Ashtons Healthcare Solutions Ltd | Wholesale & retail | 2015 |
| Ashwell & Sons BMS Limited | Financial services | 2014 |
| Ashwes Transport Ltd | Transport & logistics | 2017 |
| Ashworth Integrated Solutions Limited | Professional & scientific | 2022 |
| Ashworth Investments Ltd | Real estate | 2024 |
| Ashworth Therapies Ltd | Health & social care | 2026 |
| ASI Accountancy and Tax Services Ltd | Extraterritorial | 2022 |
| ASI Global Ltd | Professional & scientific | 2022 |
| ASI Marketing Solutions Ltd | Professional & scientific | 2018 |
| Asia Green Energy Ltd | Construction | 2021 |
| Asian Elders' Resource Centre | Health & social care | 1997 |
| Asif & Sons Properties (NW) Limited | Real estate | 2025 |
| Asif Awan Ltd | Wholesale & retail | 2026 |
| Asifcreationsgb Ltd | Wholesale & retail | 2025 |
| Asim J Munshi Consulting Ltd | Professional & scientific | 2025 |
| Asimmco Ltd | Professional & scientific | 2022 |
| Asirco Ltd | Wholesale & retail | 2010 |
| Asiyab Properties Limited | Real estate | 2018 |
| ASK 1 Transports Ltd | Transport & logistics | 2026 |
| ASK a Fella Investments Limited | Real estate | 2022 |
| ASK Computers Limited | Extraterritorial | 2007 |
| ASK Drinks Ltd | Wholesale & retail | 2014 |
| ASK Ping 118171 Limited | Information & communication | 2016 |
| Askari Security Services Limited | Administrative & support | 2021 |
| Askari Web Ltd | Information & communication | 2025 |
| Askping Limited | Administrative & support | 2015 |
| Askwith Contractors Ltd | Construction | 2022 |
| ASLIVING1 Ltd | Wholesale & retail | 2025 |
| ASM Empire Ltd | Wholesale & retail | 2026 |
| ASM Northwest Ltd | Wholesale & retail | 2020 |
| ASM Powder Coatings Limited | Administrative & support | 2018 |
| ASM Services Limited | Professional & scientific | 2020 |
| Asma Ismail Ltd | Health & social care | 2009 |
| Asma Kitchen Ltd | Hospitality | 2023 |
| Asma Locum Ltd | Health & social care | 2024 |
| Asma Telecom Ltd | Wholesale & retail | 2024 |
| Asmaexpress Limited | Wholesale & retail | 2025 |
| Asmara Sound Ltd | Information & communication | 2011 |
| Asmera (Bolton) Ltd | Wholesale & retail | 2023 |
| Asmh Investments Ltd | Financial services | 2021 |
| Asmh Properties Ltd | Real estate | 2020 |
| Asms Properties Limited | Real estate | 2019 |
| Asoc Ltd | Wholesale & retail | 2025 |
| Asot Limited | Administrative & support | 2025 |
| ASP Catering Ltd | Extraterritorial | 2018 |
| ASP Optics Ltd | Health & social care | 2023 |
| Aspden Properties Limited | Real estate | 2024 |
| Aspect Development & Maintenance Limited | Construction | 1997 |
| Aspect Retail Solutions Ltd | Professional & scientific | 2016 |
| Aspen Ventures Limited | Financial services | 2025 |
| Aspiration Blinds Limited | Wholesale & retail | 2013 |
| Aspirational Building Limited | Other services | 2019 |
| Aspire Behaviour Management Limited | Education | 2014 |
| Aspire Business Management Ltd | Information & communication | 2024 |
| Aspire Global Connections Limited | Professional & scientific | 2011 |
| Aspire Hair Studio Bolton Ltd | Other services | 2023 |
| Aspire Haulage Ltd | Transport & logistics | 2022 |
| Aspire Heating & Plumbing Solutions Limited | Construction | 2016 |
| Aspire MC Properties Ltd | Real estate | 2023 |
| Aspire Medical Services Ltd | Health & social care | 2016 |
| Aspire Photography Limited | Professional & scientific | 2025 |
| Aspire Scientific Limited | Professional & scientific | 2011 |
| Aspire Surveyors Limited | Professional & scientific | 2012 |
| Aspire Tomorrow Ltd | Real estate | 2024 |
| Aspireher Consultancy CIC | Professional & scientific | 2022 |
| Aspireher Limited | Information & communication | 2021 |
| Asps Solutions Ltd | Other services | 2024 |
| Aspull Audio Limited | Wholesale & retail | 2023 |
| Asqy Limited | Hospitality | 2019 |
| Assalaam Trade Ltd | Wholesale & retail | 2023 |
| Assan Pharmacy (South West) Limited | Wholesale & retail | 2007 |
| Assan Pharmacy Limited | Wholesale & retail | 2004 |
| Assembly Solutions Holdings Ltd | Financial services | 2016 |
| Assembly Solutions Limited | Manufacturing | 1995 |
| Assembly Techniques (Holdings) Limited | Professional & scientific | 2007 |
| Asset Condition Monitoring Limited | Construction | 2014 |
| Asset Consultants Ltd | Real estate | 2020 |
| Assiduous Plastering Ltd | Construction | 2023 |
| Assima UK Limited | Information & communication | 2003 |
| Assisted Days OUT Limited | Education | 2021 |
| Association of Certified Management Accountants | Other services | 2005 |
| Association of Certified Practising Accountants Ltd | Administrative & support | 2001 |
| Assorted Skills+ Talents Limited | Professional & scientific | 2017 |
| Assured Business Compliancy Ltd | Administrative & support | 2026 |
| Assured Care Group Ltd | Transport & logistics | 2025 |
| Assured Fostering Limited | Health & social care | 2020 |
| Assurit Limited | Administrative & support | 2025 |
| Assystem Capital UK Limited | Financial services | 2025 |
| Assystem Energy & Infrastructure Limited | Information & communication | 1996 |