| Ange's Brow and Waxing Studio Ltd | Other services | 2015 |
| Angel 1 Professional Ltd | Health & social care | 2023 |
| Angel Gabriel Limited | Manufacturing | 2014 |
| Angel Homes and Developments Ltd | Real estate | 2018 |
| Angel Homes and Property Management Ltd | Real estate | 2023 |
| Angel Homes Serviced Accommodation Ltd | Hospitality | 2019 |
| Angel Homes Southampton Ltd | Households | 2022 |
| Angel Professional Training Limited | Education | 2014 |
| Angel Window and Cleaning Services Ltd | Administrative & support | 2011 |
| Angel Yard LLP | | 2002 |
| Angel's Plumbing Ltd | Construction | 2019 |
| Angelbronze Limited | Real estate | 1984 |
| Angeli Gardens Ltd | Administrative & support | 2024 |
| Angeli Interior Services Limited | Construction | 2025 |
| Angell Developments Ltd | Real estate | 2019 |
| Angelo's Designer Baby Gifts UK Ltd | Wholesale & retail | 2021 |
| Angelq Quantum Computing Ltd | Information & communication | 2026 |
| Angels Consulting Ltd | Information & communication | 2013 |
| Ange’S Spa & Beauty Ltd | Other services | 2025 |
| Angfit Limited | Construction | 2020 |
| Angirora Group Ltd | Professional & scientific | 2025 |
| Anglo American Pictures Limited | Information & communication | 2021 |
| Anglo Business Conglomerate Ltd | Financial services | 2020 |
| Anglo Freight (UK) Ltd | Transport & logistics | 2013 |
| Anglo Global Trading Import Export Ltd | Wholesale & retail | 2020 |
| Anglo Scottish Employee Benefits Ltd | Financial services | 2006 |
| Anglo Scottish Employer Benefits Ltd. | Financial services | 2012 |
| Anglo Technical Recruitment Limited | Administrative & support | 1984 |
| Anglo-Dutch Distribution Ltd | Transport & logistics | 2016 |
| Angry-Wolf Ltd | Wholesale & retail | 2017 |
| Angus Plastering and DRY Lining Limited | Construction | 2023 |
| Angus S. Primrose Limited | Manufacturing | 1981 |
| Angus Webb Consulting Limited | Professional & scientific | 2026 |
| Anikexpress Ltd | Wholesale & retail | 2025 |
| Animal Angels C.I.C. | Wholesale & retail | 2026 |
| Animal Gifts 4 U Limited | Wholesale & retail | 2014 |
| Animus Pictures Limited | Information & communication | 2008 |
| Anis Care Company Limited | Real estate | 2016 |
| ANM Trans Ltd | Transport & logistics | 2024 |
| Anmy Ltd | Construction | 2025 |
| ANN Dyson Limited | Other services | 2008 |
| ANN Margaret Court Management Ltd | Households | 2021 |
| Anna & Freya Limited | Real estate | 2022 |
| Anna Baker Aesthetic Consulting Ltd | Education | 2018 |
| Anna Blaxland Advisory Limited | Professional & scientific | 2025 |
| Anna Joana Alexander International Ltd | Wholesale & retail | 2021 |
| Anna's Pedi & Nail Care Ltd | Other services | 2016 |
| Anna-Christina Aesthetics Ltd | Other services | 2021 |
| Anneka Nails Ltd | Other services | 2010 |
| Annelle Services Limited | Health & social care | 2014 |
| Annesley House (Management) Limited | Households | 1974 |
| Annexura Ltd | Professional & scientific | 2003 |
| Annies Ltd | Hospitality | 2017 |
| Annie’S Nails Bar Ltd | Other services | 2026 |
| Anoir Builders Limited | Construction | 2025 |
| Anonymous Labs Ltd | Other services | 2025 |
| Another Home From Home Limited | Real estate | 2025 |
| Anotherway Solutions Ltd | Real estate | 2019 |
| ANP Properties (Southampton) Limited | Extraterritorial | 2017 |
| Anquish Electrical Limited | Energy | 2016 |
| Anro Renovations Ltd | Construction | 2015 |
| ANS Quality Ltd | Professional & scientific | 2015 |
| Ansa Media Ltd | Information & communication | 2026 |
| Ansell Lawson Limited | Wholesale & retail | 2025 |
| Anstey Motor Traders Ltd | Wholesale & retail | 2023 |
| Antalya Dinners Ltd | Real estate | 2024 |
| Anthel Group Limited | Administrative & support | 2021 |
| Anthony James Properties Holdings Ltd | Financial services | 2022 |
| Anthony James Properties Limited | Real estate | 2015 |
| Anthony Paul DE Freitas Small LLC Ltd | Construction | 2025 |
| Anthony Richard Tonks Ltd | Construction | 2021 |
| Anthony's Restaurant Limited | Hospitality | 2023 |
| ANY Room Carpets Ltd | Wholesale & retail | 2025 |
| Anya Taylor Nails Ltd | Other services | 2024 |
| ANZ Marine Limited | Professional & scientific | 2023 |
| AOK Kitchens Ltd | Wholesale & retail | 2021 |
| AOK Logistics Ltd | Transport & logistics | 2026 |
| AOM Building Contractors Ltd | Construction | 2016 |
| Aone Business Intelligence Consultancy Ltd | Information & communication | 2016 |
| Aonee Delivery Ltd | Transport & logistics | 2025 |
| Aoneuk Aliali Limited | Wholesale & retail | 2022 |
| Aoneuk Fastfood Limited | Hospitality | 2022 |
| Aoneuk Globalfood Limited | Extraterritorial | 2022 |
| AP DRY Lining Ltd | Construction | 2019 |
| AP Freehold Ltd | Real estate | 2016 |
| AP Handcrafted Ltd | Wholesale & retail | 2026 |
| AP Hotels Group Ltd | Hospitality | 2013 |
| AP Hotels Group V2 Ltd | Hospitality | 1990 |
| AP Junior Limited | Manufacturing | 2024 |
| AP Plant Operating Services Ltd | Construction | 2017 |
| AP Printing Solutions Ltd | Manufacturing | 2026 |
| AP4 LLP | | 2010 |
| Apap PUB Co Ltd | Hospitality | 2024 |
| APC Contracts Limited | Construction | 2018 |
| APD Construction & Improvements Limited | Construction | 2019 |
| APE Rescue Trust | Extraterritorial | 1999 |
| Apecs Ltd | Construction | 2004 |
| Apeiron Developments Limited | Professional & scientific | 2010 |
| Aperture Intelligence AI Ltd | Professional & scientific | 2024 |
| Apex Accountants (South) Limited | Professional & scientific | 2026 |