| Amaranthus Consultants Ltd | Professional & scientific | 2026 |
| Amara’S Harvest Limited | Wholesale & retail | 2025 |
| Amazing Mortgage Solutions Limited | Financial services | 2024 |
| Ambassador House Holdings Limited | Construction | 1977 |
| Ambassador House Investments Limited | Real estate | 2012 |
| Ambassador Square E14 Limited | Households | 1988 |
| Amber Jean Retail Limited | Wholesale & retail | 2022 |
| Amberstone DEV Ltd | Real estate | 2023 |
| Ambika Investments Limited | Construction | 2013 |
| AMD Windows & Doors Ltd | Construction | 2026 |
| Amdbc Ltd | Professional & scientific | 2025 |
| Amelia & Khadija Limited | Real estate | 2016 |
| Amelie Creative Ltd | Information & communication | 2025 |
| Amentes Education Limited | Education | 2025 |
| Ameralla Properties Ltd | Real estate | 2022 |
| Ameritins UK Limited | Manufacturing | 2019 |
| Amethyst Trading Partners Ltd | Wholesale & retail | 2023 |
| AMG Global Group Ltd | Administrative & support | 2014 |
| Amgr Limited | Administrative & support | 2007 |
| Amhurst Court RTM Company Limited | Extraterritorial | 2015 |
| Amhurst YS Ltd | Real estate | 2024 |
| Amin Property Management Limited | Real estate | 2012 |
| Amir Shoots Limited | Transport & logistics | 2024 |
| Amis Services Ltd | Real estate | 2019 |
| AMK Commerce Limited | Professional & scientific | 2026 |
| Amour Consulting Limited | Other services | 2016 |
| Amour Maison Limited | Real estate | 2023 |
| AMP OPS Ltd | Information & communication | 2014 |
| Amresh Limited | Financial services | 2016 |
| Amriah Limited | Hospitality | 2019 |
| Amsc Services Ltd | Construction | 2016 |
| Amsoph Ltd | Financial services | 2023 |
| Amsoph Ventures Ltd | Financial services | 2023 |
| Amtest Associates Limited | Professional & scientific | 1992 |
| Amuwa Solutions Limited | Professional & scientific | 2022 |
| AMV Windows and Doors Ltd | Construction | 2026 |
| Amym Ltd | Construction | 2015 |
| Amyra Hospitality Limited | Hospitality | 2020 |
| AN Taxi Solutions Ltd | Transport & logistics | 2024 |
| ANA Tech Solutions Limited | Information & communication | 2023 |
| Anagram Media Limited | Information & communication | 2013 |
| Analycat Limited | Information & communication | 2015 |
| Anandamaya Ltd | Wholesale & retail | 2026 |
| Ananta Trading Limited | Wholesale & retail | 2022 |
| Anchor House Ltd | Construction | 2022 |
| Anchorage Consultancy Ltd | Financial services | 2020 |
| Andaly Construction Limited | Construction | 2022 |
| Andconstruct Ltd | Construction | 2016 |
| Andover Dental Practice Ltd | Health & social care | 2012 |
| Andrea Wulf Ltd | Administrative & support | 2018 |
| Andrew Contractors Ltd | Construction | 2014 |
| Andrew Wolmark Ltd | Professional & scientific | 2020 |
| Andrews Glasswork Ltd | Manufacturing | 2025 |
| Andrews Yard Management Company Limited | Households | 2017 |
| Andy Macdonald Music Management Ltd | Other services | 2022 |
| Anemos Limited | Hospitality | 1986 |
| Aneson Kroft Limited | Administrative & support | 2016 |
| Aney Engineering Services Ltd | Professional & scientific | 2023 |
| Anfaon Properties Limited | Real estate | 2016 |
| Angel Building & Business Ltd | Construction | 2014 |
| Angel Spark Ltd | Wholesale & retail | 2025 |
| Angle House Whetstone Ltd | Health & social care | 2017 |
| Anglestar Limited | Financial services | 1989 |
| Anglo Celtic Insurance Consultants Limited | Financial services | 1996 |
| Anglo Connections Limited | Hospitality | 2006 |
| Anglo Greco Holdings Limited | Professional & scientific | 2005 |
| Anglo Israel Association Corporate Trustee | Other services | 2015 |
| Ani.M Limited | Wholesale & retail | 2005 |
| Aniko Estates Limited | Real estate | 2023 |
| Aniko Group Limited | Information & communication | 2017 |
| Aniko Investments Ltd | Real estate | 2018 |
| Animated Women (UK) Limited | Other services | 2016 |
| Anime Emporium Limited | Wholesale & retail | 2023 |
| ANJ Services Ltd | Construction | 2021 |
| Anka Developments Limited | Real estate | 2024 |
| Ankaram Group Limited | Construction | 2010 |
| Annibale Limited | Professional & scientific | 2005 |
| Anointed Hands Hair and Beauty Ltd | Professional & scientific | 2013 |
| Ansdell Management Company Limited | Real estate | 1997 |
| Ansel Krut Limited | Arts & recreation | 2010 |
| Ansh & Aura Limited | Wholesale & retail | 2025 |
| Ansh & Om's London Limited | Wholesale & retail | 2025 |
| Anstruther Realisations (Holdings) Limited | Administrative & support | 2017 |
| Anstruther Realisations Limited | Administrative & support | 2006 |
| Antek Properties Ltd | Real estate | 2019 |
| Anti Tech Solutions Ltd | Wholesale & retail | 2023 |
| Anup J. Patel Ltd | Other services | 2017 |
| Anuron Ltd | Health & social care | 2021 |
| Anuva International Limited | Wholesale & retail | 2006 |
| ANY Deal Ltd | Wholesale & retail | 2016 |
| ANY MOT Ltd | Administrative & support | 2023 |
| Anya House Limited | Real estate | 2007 |
| AP Adviser Ltd | Financial services | 2024 |
| AP Bathrooms Ltd | Wholesale & retail | 2011 |
| AP Business Consultancy Limited | Administrative & support | 2015 |
| AP Design London Ltd | Professional & scientific | 2023 |
| AP Eyes Ltd | Health & social care | 2021 |
| AP Financial Advisers Limited | Financial services | 2020 |
| AP Samrat Limited | Professional & scientific | 2025 |
| APA Environment and Energy PVT Ltd | Energy | 2019 |