| Alpen Contracts Ltd | Construction | 2026 |
| Alpha Apex Property Ltd | Real estate | 2025 |
| Alpha Estate Solutions Limited | Real estate | 2024 |
| Alpha Home Trading Ltd | Wholesale & retail | 2019 |
| Alpha Omega Apparel Ltd | Wholesale & retail | 2019 |
| Alpha One Retail Limited | Wholesale & retail | 2014 |
| Alpha Photographers Ltd | Professional & scientific | 2011 |
| Alpha Prestige Repair Ltd | Manufacturing | 2026 |
| Alpha Projects Team Ltd | Construction | 2022 |
| Alpha Rail Training Limited | Other services | 2004 |
| Alpha Wholesale Services Limited | Transport & logistics | 2003 |
| Alphacladd Ltd | Construction | 2024 |
| Alphagrid Limited | Real estate | 2025 |
| Alphapak Limited | Administrative & support | 2013 |
| Alpharm Ltd | Wholesale & retail | 2005 |
| Alphonsa Healthcare Limited | Administrative & support | 2016 |
| Alpine Display Ltd | Construction | 2012 |
| Alpine Sales and Services Ltd | Wholesale & retail | 2022 |
| Alpine Travel Ltd | Transport & logistics | 2024 |
| Alpixel Ltd | Arts & recreation | 2024 |
| Alpo Limited | Professional & scientific | 1982 |
| Alps Developments Midlands Limited | Construction | 2013 |
| Alpx Guarding Ltd | Financial services | 2025 |
| Alpyne Property Group Ltd | Real estate | 2026 |
| Alrafaymed Ltd | Health & social care | 2022 |
| Alrawdahtour Ltd | Administrative & support | 2024 |
| Alrewic Ltd | Construction | 2024 |
| Alsabah Estates Ltd | Real estate | 2023 |
| Alson Engineering Limited | Manufacturing | 2003 |
| Alsons Group Ltd | Wholesale & retail | 2021 |
| Alsupermktnew Ltd | Transport & logistics | 2023 |
| ALT CNC Machine Tool Services Ltd. | Manufacturing | 2013 |
| ALT Web Design Ltd | Professional & scientific | 2012 |
| Altan Limited | Other services | 2021 |
| Alternative Cleansing Limited | Water & waste | 2009 |
| Alternative Trading 2014 Ltd | Water & waste | 2014 |
| Alternative Trading 2020 Limited | Manufacturing | 2020 |
| Alto Handling Limited | Wholesale & retail | 2002 |
| Altrivon Ltd | Transport & logistics | 2026 |
| Altuseo Solutions Ltd | Information & communication | 2026 |
| Alu-Glaze & Door Engineers Ltd | Professional & scientific | 2023 |
| Alu-Glaze Limited | Construction | 2018 |
| Aluminium Glazing Solutions (Midlands) Ltd. | Construction | 2008 |
| Aluminium Support Services Limited | Manufacturing | 2021 |
| Alveston Healthcare Limited | Extraterritorial | 2025 |
| Alvex Investment Ltd | Households | 2021 |
| Alzearli Ltd | Transport & logistics | 2024 |
| AM & NM Co Limited | Financial services | 2026 |
| AM 665 Limited | Real estate | 2023 |
| AM Auto Salvage Ltd | Wholesale & retail | 2021 |
| AM Carpentry Services Ltd | Construction | 2023 |
| AM Logistics WM Ltd | Transport & logistics | 2018 |
| AM on Cloud Nine Ltd | Hospitality | 2025 |
| AM Transportation Ltd | Transport & logistics | 2023 |
| AM Transportation Services Ltd | Transport & logistics | 2026 |
| AMA S Transport Limited | Transport & logistics | 2014 |
| AMA Transporters Limited | Wholesale & retail | 2014 |
| AMA Ventures Ltd | Education | 2025 |
| Amaan Property Services Limited | Construction | 2017 |
| Amaan Traders Limited | Administrative & support | 2017 |
| Amaan's Carz Limited | Administrative & support | 2018 |
| Amaani London Ltd | Wholesale & retail | 2016 |
| Amad and Brothers Ltd | Wholesale & retail | 2024 |
| Amah Nurseries Limited | Health & social care | 2015 |
| Amaka YA Bwingi Ltd | Construction | 2006 |
| Aman & Aran Property Management Ltd | Real estate | 2018 |
| Amanah Finance Ltd | Financial services | 2025 |
| Amanah Travel Services Ltd | Administrative & support | 2026 |
| Amanar (One) Ltd | Real estate | 2018 |
| Amans Private Hire Ltd | Transport & logistics | 2021 |
| Amans Travel Limited | Transport & logistics | 2014 |
| Amanton Limited | Administrative & support | 2018 |
| Amar Foods Online Limited | Wholesale & retail | 2025 |
| Amar Investments Limited | Real estate | 2018 |
| Amass Associates LLP | | 2021 |
| Amathus Developments Limited | Construction | 2013 |
| Amazing Grace Business Services Ltd | Transport & logistics | 2019 |
| Amazonify Ltd | Transport & logistics | 2024 |
| AMB Services (Europe) Limited | Transport & logistics | 2010 |
| Ambasonic Ltd | Information & communication | 2019 |
| Ambasri Consultancy Ltd | Health & social care | 2022 |
| Amber Auditing Limited | Information & communication | 2019 |
| Amber Care Management CIC | Health & social care | 2025 |
| Amber Gardens Ltd | Households | 2025 |
| Ambertex Limited | Wholesale & retail | 1993 |
| Ambition in Mind CIC | Education | 2024 |
| Ambrosi Insulation Ltd | Construction | 2025 |
| Ambur Community Radio Limited | Information & communication | 2008 |
| AMD Property Services & Management Ltd | Real estate | 2026 |
| Amerie Hair and Beauty Ltd | Other services | 2024 |
| Amexi Limited | Administrative & support | 2012 |
| Amez-Uk Ltd | Wholesale & retail | 2022 |
| AMH Recruitment Ltd | Administrative & support | 2025 |
| Amigo Sale Limited | Wholesale & retail | 2022 |
| Amik Consultancy Ltd | Professional & scientific | 2026 |
| Amillore Ltd | Administrative & support | 2024 |
| Amina’S Deals Ltd | Wholesale & retail | 2025 |
| Amir Khan Ltd | Wholesale & retail | 2025 |
| Amixiux Ltd | Transport & logistics | 2024 |
| AMJ Business Services Limited | Professional & scientific | 2024 |