| Amret Limited | Information & communication | 2015 |
| Amrial Care Limited | Health & social care | 1998 |
| Amsaho Limited | Professional & scientific | 2013 |
| Amundson Marketing Ltd | Professional & scientific | 2022 |
| Amuno Consulting LLP | | 2013 |
| Amuno Developments Limited | Extraterritorial | 2013 |
| Amuno Investments Limited | Financial services | 2013 |
| Amuno Limited | Administrative & support | 2013 |
| Amuzo Games Limited | Information & communication | 2013 |
| Amuzo Limited | Information & communication | 2001 |
| Amyand Lodge Limited | Households | 1956 |
| Amynwa Limited | Administrative & support | 2025 |
| An&Nails Ltd | Other services | 2022 |
| Anagen Trichology Studio Ltd | Other services | 2026 |
| Anagha Catering Supplies Ltd | Wholesale & retail | 2012 |
| Analysis and Insight Limited | Information & communication | 2020 |
| Anathema Emporium Ltd | Extraterritorial | 2026 |
| Anatolia Grill House Ltd | Hospitality | 2025 |
| Anawilq Limited | Wholesale & retail | 2025 |
| ANB Plastering & Drylining Limited | Construction | 2019 |
| Anbaham Ltd | Real estate | 2022 |
| Anchor Serviced Accommodation Ltd | Real estate | 2023 |
| Anchoright Ltd | Manufacturing | 2022 |
| Ancil Williams Solutions Limited | Professional & scientific | 2020 |
| Ancrum Lodge (Branksome Park) Limited | Households | 1967 |
| Andav Ltd | Wholesale & retail | 2016 |
| Anddar Ltd | Administrative & support | 2020 |
| Anderson Comms Ltd | Construction | 2015 |
| Anderson James Ltd | Administrative & support | 2015 |
| Anderson Manor Farm | Agriculture & fishing | 1964 |
| Andford Properties Limited | Real estate | 1968 |
| Andre & JAD Limited | Real estate | 2026 |
| Andree Court (Highcliffe) Limited | Households | 1988 |
| Andreea Express Ltd | Transport & logistics | 2015 |
| Andrew DE Jersey Limited | Financial services | 2015 |
| Andrew Flockhart Consulting Ltd | Professional & scientific | 2020 |
| Andrews Burton Consulting Limited | Professional & scientific | 2003 |
| Andrews Plant Hire Limited | Construction | 2001 |
| Andsem Properties Limited | Real estate | 2020 |
| Andy King Financial Consultancy Limited | Financial services | 2003 |
| Andy Overton Design Ltd | Information & communication | 2024 |
| Andy Parsons Executive Travel Ltd | Transport & logistics | 2025 |
| Andyt Engineering Ltd | Other services | 2019 |
| Angad PVT Ltd | Real estate | 2025 |
| Angel Brave Ltd | Wholesale & retail | 2026 |
| Angel Eyes International Ltd | Wholesale & retail | 2025 |
| Angel Face Medical Aesthetics Limited | Other services | 2023 |
| Angel Face Medspa Ltd | Other services | 2025 |
| Angel House Accommodation Ltd | Hospitality | 2023 |
| Angela International Aesthetic Ltd | Other services | 2017 |
| Angelview Properties Limited | Real estate | 2006 |
| Angelyca Ltd | Health & social care | 2023 |
| Angerlo Pharma Services Ltd | Health & social care | 2022 |
| Anglo Land Ltd | Real estate | 2024 |
| Anglo Limited | Education | 2016 |
| Anglo Property Services Limited | Transport & logistics | 1992 |
| Angola Capital Partners Ltd | Wholesale & retail | 2023 |
| Angry Limited | Professional & scientific | 2025 |
| Angus Project Management Ltd | Professional & scientific | 2017 |
| Animaljobsdirect Limited | Education | 2005 |
| Animated Artists Limited | Extraterritorial | 2005 |
| Animates Pet Limited | Professional & scientific | 2023 |
| Anivic Ltd | Health & social care | 2021 |
| ANN Fashion Ltd | Wholesale & retail | 2022 |
| Anna Pelc Ltd | Administrative & support | 2022 |
| Anna-Sophia John Digital Services Limited | Professional & scientific | 2025 |
| Annabel Elliot Limited | Wholesale & retail | 2003 |
| Annabelle Rentals Limited | Real estate | 2023 |
| Annadent Limited | Health & social care | 2021 |
| Anndos Limited | Administrative & support | 2020 |
| Annette Paterakis Ltd | Professional & scientific | 2024 |
| Annex 29 Limited | Professional & scientific | 2018 |
| Annie Pryce Aesthetics Ltd | Other services | 2022 |
| Annis Limited | Real estate | 1994 |
| Anouar Ltd | Other services | 2018 |
| Ansate Ltd | Real estate | 2018 |
| Ansell & Okane Developments Ltd | Real estate | 2025 |
| Ansell Property Group Ltd | Real estate | 2025 |
| Ansh Property Services Limited | Real estate | 2025 |
| Ansor Dent Ltd | Health & social care | 2020 |
| Anstey Holdings Limited | Extraterritorial | 2022 |
| Antelope Homes Limited | Construction | 2006 |
| Antep Ltd | Hospitality | 2026 |
| Anthony David & Co Holdings Limited | Financial services | 2025 |
| Anthony David & Co Lettings Limited | Real estate | 2025 |
| Anthony David & Co Limited | Real estate | 2011 |
| Anthonyprop Limited | Real estate | 2026 |
| Antom Limited | Construction | 2016 |
| Antony's Decorating Limited | Construction | 2024 |
| Antser Ltd | Hospitality | 2019 |
| Anvil Point Asset Management Ltd | Financial services | 2026 |
| Anxiety Free International CIC | Other services | 2010 |
| Anyclean Premium Limited | Administrative & support | 2003 |
| Anyserve Ltd | Professional & scientific | 2015 |
| Anytime Drainage Solutions Ltd | Water & waste | 2024 |
| Anytime Locksmiths Limited | Administrative & support | 2010 |
| Anzayi Studios Limited | Information & communication | 2025 |
| AOS Engineering Services Limited | Professional & scientific | 2019 |
| AP HKC Ltd | Financial services | 2023 |
| AP Textile Limited | Manufacturing | 2013 |