| Amophi Shipping Ltd | Transport & logistics | 2016 |
| AMP Electrics Limited | Construction | 2002 |
| Ampari Ltd | Wholesale & retail | 2025 |
| Ampersoft Limited | Information & communication | 2001 |
| Amphos Ltd | Professional & scientific | 2024 |
| Ampla Consulting Limited | Professional & scientific | 2015 |
| Ample Property Ltd | Construction | 2004 |
| Amrc Investment Limited | Real estate | 2024 |
| Amrel Limited | Professional & scientific | 2019 |
| Amriksinghdoc Limited | Health & social care | 2021 |
| Amrit Houses Ltd | Construction | 2025 |
| Amrixx Properties Limited | Real estate | 2025 |
| Amrr Services Ltd | Transport & logistics | 2026 |
| AMS Derbyshire Ltd | Financial services | 2019 |
| AMS Flooring Solutions Ltd | Construction | 2019 |
| AMS Garden Buildings Limited | Construction | 2011 |
| AMS Plus Limited | Transport & logistics | 2016 |
| AMS Property Invest Ltd | Real estate | 2025 |
| Amsi Asset Solutions Ltd | Real estate | 2021 |
| Amsi Consultancy Services Ltd | Professional & scientific | 2011 |
| AMT Global Ltd | Real estate | 2025 |
| AMUST4MUSIC Holdings Limited | Financial services | 2017 |
| AMUST4MUSIC Limited | Arts & recreation | 2000 |
| AMW Engineering Services Limited | Manufacturing | 2018 |
| AMY & Morgan Property Investors Ltd | Real estate | 2025 |
| AMY Cycling Adventures Ltd | Information & communication | 2026 |
| AMY Derby Limited | Professional & scientific | 1989 |
| AMY Ellingham Limited | Professional & scientific | 2019 |
| AMY Rose Beauty Ltd | Other services | 2025 |
| AMY Warden Property Ltd | Real estate | 2024 |
| Amygda Labs Ltd | Information & communication | 2018 |
| Amza Corporation Limited | Financial services | 1994 |
| AN Catalyst Ltd | Professional & scientific | 2017 |
| AN Catering Ltd | Hospitality | 2025 |
| AN Investments Ltd | Real estate | 2010 |
| AN Nisa Events CIC | Education | 2020 |
| AN Toys & Accessories Ltd | Wholesale & retail | 2026 |
| ANA Mcleod Consultancy Ltd | Professional & scientific | 2022 |
| Analog Symbiosis Ltd | Information & communication | 2020 |
| Analytical Alternatives Limited | Administrative & support | 2002 |
| Ananta Enterprise Ltd | Real estate | 2022 |
| Anarchy Art Ltd | Wholesale & retail | 2018 |
| Anasrehman Ltd | Wholesale & retail | 2024 |
| Anaya's CMH Solutions Ltd | Health & social care | 2025 |
| ANB Property Group Ltd | Real estate | 2026 |
| ANC Holding Ltd | Professional & scientific | 2024 |
| ANC Overseas Limited | Wholesale & retail | 2025 |
| Ancarey Consulting Limited | Information & communication | 2023 |
| Ancarvalde Aluminium Limited | Manufacturing | 2025 |
| Ancestories Ltd | Education | 2024 |
| Anchor and Crew Limited | Wholesale & retail | 2016 |
| Andach Limited | Administrative & support | 2021 |
| Andam Healthcare Ltd | Health & social care | 2021 |
| Andam Investments Ltd | Real estate | 2018 |
| Ande Commonwealth Operations Limited | Professional & scientific | 2019 |
| Andersen and RAY Ltd | Professional & scientific | 2015 |
| Anderson Electrical Retail Ltd | Wholesale & retail | 2004 |
| Anderson Electrical Trade Ltd | Wholesale & retail | 2009 |
| Anderson FD Solutions Limited | Professional & scientific | 2016 |
| Anderson Project & Change Management Ltd | Professional & scientific | 2017 |
| Andra Health Limited | Health & social care | 2017 |
| Andras Bode Ltd | Wholesale & retail | 2022 |
| Andreea MIX Ltd | Transport & logistics | 2024 |
| Andreea Solutions Ltd | Transport & logistics | 2026 |
| Andrei Motors Limited | Wholesale & retail | 2016 |
| Andrenette Early Years Ltd | Health & social care | 2024 |
| Andrew Brown Photography Ltd | Professional & scientific | 2020 |
| Andrew Consulting (UK) Limited | Administrative & support | 2007 |
| Andrew Edwards Ltd | Financial services | 2013 |
| Andrew Hill Electrical Services Limited | Construction | 2013 |
| Andrew Matthew Wayman Limited | Professional & scientific | 2023 |
| Andrew Oliver Property Ltd | Real estate | 2022 |
| Andrew Oliver Waste Management Ltd | Water & waste | 2025 |
| Andrew Powell Limited | Financial services | 2024 |
| Andrew Project Management Limited | Professional & scientific | 2014 |
| Andrew Ross Design Limited | Information & communication | 2018 |
| Andrew Sullivan Promotions Ltd | Arts & recreation | 2011 |
| Andrew Tiller Property Developments Ltd | Real estate | 2003 |
| Andrew Wallis Agricultural Contractor Limited | Other services | 2008 |
| Andrewp 65 Limited | Extraterritorial | 2014 |
| Andrews Construction Solutions Ltd | Construction | 2023 |
| Andy King Rigging Ltd | Arts & recreation | 2021 |
| Andy Martin Limited | Professional & scientific | 2022 |
| Andy Sykes Design Limited | Professional & scientific | 2023 |
| Andy Trade Moto Ltd | Transport & logistics | 2024 |
| Andyvan Ltd | Transport & logistics | 2018 |
| Aneils Fragrances Ltd | Other services | 2025 |
| ANEILS416 Ltd | Wholesale & retail | 2018 |
| Aneliza Ltd | Transport & logistics | 2020 |
| Anemoi Labs Limited | Manufacturing | 2018 |
| Anesta Property Ltd | Real estate | 2024 |
| Anexis Consulting Ltd | Information & communication | 2026 |
| ANG Trans Logistic Ltd | Construction | 2020 |
| Angad Courier Service Ltd | Transport & logistics | 2017 |
| Angad Transport Ltd | Transport & logistics | 2020 |
| Angel Energy Ltd | Education | 2025 |
| Angel Ridge (Three) Management Company Limited | Households | 2009 |
| Angela Drive Ltd | Transport & logistics | 2018 |
| Angels' Temptations Ltd | Manufacturing | 2023 |
| Angelworks Construction Ltd | Construction | 2025 |