| AMP Lettings Ltd | Real estate | 2013 |
| AMP Products Ltd | Wholesale & retail | 2023 |
| Amro Vision Ltd | Real estate | 2025 |
| Amrut Traders PVT. Ltd. | Wholesale & retail | 2011 |
| Amta Ltd | Real estate | 2023 |
| Amto Consulting Ltd | Financial services | 2015 |
| Amurhey Ltd | Wholesale & retail | 2025 |
| AMV Location Management & Events Ltd | Administrative & support | 2025 |
| Amwa Group Limited | Information & communication | 2025 |
| Amwali Financials Ltd | Professional & scientific | 2026 |
| AMY Curtis Fitness Limited | Information & communication | 2017 |
| AMY International Trading Co. Ltd | Wholesale & retail | 2026 |
| Amyui Ltd | Wholesale & retail | 2025 |
| AN HUI JIA Hang Ltd | Wholesale & retail | 2026 |
| Anaconda Management Ltd | Professional & scientific | 2024 |
| Anagram Upholstery Services Ltd | Manufacturing | 2013 |
| Anaig (UK) Technology Co., Ltd | Extraterritorial | 2015 |
| ANB NDT Limited | Professional & scientific | 2021 |
| Anbsilo Ltd | Wholesale & retail | 2025 |
| Ancestors Unknown CIC | Education | 2020 |
| Anchormind AI Ltd | Manufacturing | 2025 |
| AND Oxfordshire Limited | Health & social care | 2026 |
| And-Goat Ltd | Manufacturing | 2024 |
| Andian Consulting Services Limited | Information & communication | 2024 |
| Andino Furniture Co., Ltd | Extraterritorial | 2021 |
| Andrew Baldwin Consultancy Ltd | Professional & scientific | 2018 |
| Andrew F. Watson (Hereford) Limited | Wholesale & retail | 1992 |
| Andrew James Spencer Ltd | Extraterritorial | 2024 |
| Andrews Cansas Ltd | Wholesale & retail | 2025 |
| Andy Corbett Limited | Administrative & support | 2021 |
| ANDYSAUTOS81 Ltd | Wholesale & retail | 2025 |
| Aneelas Industry Ltd | Wholesale & retail | 2026 |
| Anexhomes Ltd | Real estate | 2025 |
| Ange Electric Ltd | Wholesale & retail | 2024 |
| Angel 6 Properties Ltd | Real estate | 2023 |
| Angel Fish Bar Ltd | Hospitality | 2026 |
| Angel Mart Ltd | Wholesale & retail | 2025 |
| Angel Vision Stream Limited | Wholesale & retail | 2025 |
| Angels Workshop Limited | Education | 2020 |
| ANGELS4BUSINESS UK Ltd | Real estate | 2023 |
| Angguochao Ltd | Wholesale & retail | 2025 |
| Angkesailazf Co., Ltd | Wholesale & retail | 2025 |
| Angle Tarot CIC | Information & communication | 2025 |
| Angling Core Ltd | Wholesale & retail | 2026 |
| Anglo Trade Hub Ltd | Wholesale & retail | 2025 |
| Angniuchu Ltd | Wholesale & retail | 2025 |
| Angvis Ltd | Information & communication | 2020 |
| Anhui Qasim Grinding Ball Group Co., Ltd. | Administrative & support | 2025 |
| Anielina Ltd | Professional & scientific | 2026 |
| Anima Studio Ltd | Information & communication | 2025 |
| Animal Adventurers Ltd | Wholesale & retail | 2022 |
| Animal Equality | Health & social care | 2009 |
| Animate London Ltd | Hospitality | 2019 |
| Anis Quant & Digitals Ltd | Information & communication | 2025 |
| Anjje Ltd | Wholesale & retail | 2025 |
| ANK Commerce Ltd | Wholesale & retail | 2021 |
| Ankara by Akin Limited | Manufacturing | 2026 |
| Ankurtrends Ltd | Wholesale & retail | 2025 |
| Anlushu Ltd | Wholesale & retail | 2025 |
| ANN Siobhan Ferry Ltd | Extraterritorial | 2022 |
| ANN Vasey Properties Ltd | Real estate | 2024 |
| Anna's White IVY Limited | Wholesale & retail | 2026 |
| Annabel Jewellery Ltd | Wholesale & retail | 2018 |
| Annadale Mautler Ltd | Wholesale & retail | 2025 |
| Annal Limited | Wholesale & retail | 2025 |
| Annasley Park Ltd | Administrative & support | 2025 |
| Annlysn UK Holdings Company Limited | Manufacturing | 2020 |
| Annuit Wonder Ltd | Real estate | 2021 |
| Annuity Choices Limited | Extraterritorial | 2005 |
| Anolkem Group (UK) Ltd | Manufacturing | 2025 |
| Another Great Idea Limited | Professional & scientific | 2011 |
| Anovaflow Ltd | Information & communication | 2025 |
| Anprospe Ltd | Manufacturing | 2024 |
| Ansa Vending Ltd | Hospitality | 2023 |
| Ansbo Int'L Limited | Manufacturing | 2011 |
| Anson Classic Restorations Limited | Wholesale & retail | 2012 |
| Ante Hong Trading Limited | Wholesale & retail | 2025 |
| Anthony Royd Ltd | Information & communication | 2024 |
| Anthony Tierney Ltd | Professional & scientific | 2025 |
| Anthonyamz Ltd | Wholesale & retail | 2025 |
| Anthracyte Ltd | Information & communication | 2025 |
| Anticaptcha Development LP | | 2021 |
| Antoda Global Ltd | Wholesale & retail | 2026 |
| Antscore Ltd | Information & communication | 2025 |
| ANU Capital Limited | Professional & scientific | 2025 |
| Anusolutions Ltd | Information & communication | 2022 |
| Anvoner Consulting Ltd | Professional & scientific | 2026 |
| Anvtt Ltd | Wholesale & retail | 2026 |
| Anwaltskanzlei Stefan Seuss Ltd | Professional & scientific | 2022 |
| Anxiety CBT Ltd | Health & social care | 2025 |
| Anyani Ltd | Wholesale & retail | 2025 |
| Anycases Ltd | Manufacturing | 2023 |
| Anyegzh Ltd | Wholesale & retail | 2025 |
| Anzu Ltd | Manufacturing | 2012 |
| Aodesaizf Co., Ltd | Wholesale & retail | 2025 |
| Aoki Ltd | Wholesale & retail | 2026 |
| Aola Allmatget Ltd | Wholesale & retail | 2025 |
| Aolamengnt Ltd | Wholesale & retail | 2025 |
| Aonex Group Ltd | Wholesale & retail | 2026 |
| AP Complete (Carpentry & Building) Ltd | Construction | 2016 |