| Anmole Ltd | Real estate | 2025 |
| Anmt Investments Limited | Real estate | 2021 |
| ANN3 Ltd | Administrative & support | 2023 |
| Anna Bramley Therapy Limited | Health & social care | 2022 |
| Anna Hartley Creative Ltd | Professional & scientific | 2026 |
| Anna Moores Limited | Professional & scientific | 2017 |
| Anna Whalley Consulting Ltd | Professional & scientific | 2021 |
| Anne James Advisory Limited | Professional & scientific | 2013 |
| Annear Tully Studio Ltd | Professional & scientific | 2018 |
| Annesben Ltd | Information & communication | 2022 |
| Annies Stores Ltd | Wholesale & retail | 2019 |
| Annmil Construction Ltd. | Administrative & support | 2018 |
| Annmil Investments Ltd. | Hospitality | 2018 |
| Announce Media Limited | Information & communication | 2023 |
| Anona Media and Consulting Limited | Professional & scientific | 2025 |
| Another Architecture and Interiors Limited | Professional & scientific | 2017 |
| ANS Building Consultancy Ltd | Professional & scientific | 2024 |
| Ansm Ltd | Wholesale & retail | 2025 |
| Anstone Real Estate Ltd | Professional & scientific | 2024 |
| Answer ME Limited | Administrative & support | 2023 |
| Answers Management Limited | Professional & scientific | 2015 |
| ANT Made This Ltd | Professional & scientific | 2022 |
| Antalya Barber STK Ltd | Other services | 2026 |
| Anthion Ltd | Professional & scientific | 2026 |
| Anthony Agricultural Services Limited | Agriculture & fishing | 2016 |
| Anthony James Projects Limited | Professional & scientific | 2019 |
| Anthony Wych & Co Limited | Professional & scientific | 2021 |
| Anti Aging Medical Group Ltd | Professional & scientific | 2023 |
| Antica Group Limited | Real estate | 2023 |
| Antica House Ltd | Real estate | 2010 |
| Antica Management Limited | Real estate | 2010 |
| Antica Rentals Limited | Real estate | 2023 |
| Anticus Recruitment Ltd | Administrative & support | 2016 |
| Antiques Village Limited | Wholesale & retail | 2020 |
| Antix Productions Limited | Information & communication | 2001 |
| Antonio Guillen Legal Limited | Professional & scientific | 2015 |
| Antoniou Food Group Limited | Hospitality | 2018 |
| Antor Holdings Ltd | Financial services | 2026 |
| Antrobus Street Holdings Ltd | Real estate | 2025 |
| Anubis Pet Supplies Ltd | Wholesale & retail | 2024 |
| Anuvix Ltd | Information & communication | 2026 |
| Anuza Group Ltd | Financial services | 2026 |
| Anvi Health Ltd | Public administration | 2025 |
| Anvil Foundations Limited | Construction | 1994 |
| Anvil Piling and Foundations Ltd | Construction | 2012 |
| Anville Limited | Wholesale & retail | 2018 |
| Anwaar Ltd | Wholesale & retail | 2025 |
| Anwar Investment Management Group Limited | Real estate | 2026 |
| ANY Business Limited | Administrative & support | 2011 |
| Anydata Limited | Information & communication | 1988 |
| Anything Ships Enterprise Limited | Wholesale & retail | 2025 |
| Anytime Events Ltd | Hospitality | 2015 |
| AOA Holding Ltd | Wholesale & retail | 2024 |
| Aoex Ltd | Wholesale & retail | 2026 |
| AOG Air Services Limited | Manufacturing | 2022 |
| AOG Technical Services Ltd | Manufacturing | 2025 |
| Aokai UK Ltd | Manufacturing | 2020 |
| AOL Holdings Ltd | Financial services | 2024 |
| Aontacht Holdings Limited | Financial services | 2025 |
| Aontacht Limited | Health & social care | 2022 |
| AOR Joinery Ltd | Construction | 2019 |
| AOU Holdings Ltd | Real estate | 2026 |
| AP Automation Limited | Professional & scientific | 2023 |
| AP Evergreen Limited | Financial services | 2019 |
| AP Real Estate Ltd | Real estate | 2020 |
| APA Legal Consultancy Limited | Administrative & support | 2015 |
| APA Technologies UK Limited | Wholesale & retail | 2017 |
| Apache Marine Services Ltd | Transport & logistics | 2022 |
| Apalc Limited | Professional & scientific | 2017 |
| APB Medical Ltd | Health & social care | 2019 |
| APC Beauty Ltd | Other services | 2023 |
| Apedale Valley Light Railway Ltd | Transport & logistics | 2010 |
| Apem Bidco Limited | Financial services | 2025 |
| Apem Group Limited | Financial services | 2019 |
| Apem Midco Limited | Financial services | 2025 |
| Aperture Holdings Ltd | Real estate | 2018 |
| Apex Autocare Ltd | Wholesale & retail | 2023 |
| Apex Information Technology Limited | Information & communication | 2009 |
| Apex Interior Solutions (SW) Limited | Construction | 2025 |
| Apex Northwest Ltd | Construction | 2022 |
| Apex Plantation Shutters Ltd | Construction | 2026 |
| Apexdata Limited | Professional & scientific | 2019 |
| APH (Bredbury) Limited | Financial services | 2002 |
| APH Business Services Ltd | Administrative & support | 2020 |
| APH Consulting Limited | Professional & scientific | 2025 |
| Aphiliate Ltd | Professional & scientific | 2023 |
| API Equity Limited | Other services | 1990 |
| APJ Property Management Limited | Real estate | 2022 |
| APK Rail Services Ltd | Professional & scientific | 2022 |
| APL Locksmiths Limited | Administrative & support | 1999 |
| APM Eyecare Ltd | Health & social care | 2010 |
| Apmcosmetics Limited | Health & social care | 2022 |
| Apollo Aviation Ltd | Manufacturing | 2018 |
| Apollo Cladding Ltd | Construction | 2025 |
| Apollo Fitness Limited | Arts & recreation | 2010 |
| Apollo Land Services Ltd | Professional & scientific | 2025 |
| Apollo Pointing Ltd | Construction | 2024 |
| Apollo Sunbeds (UK) Limited | Administrative & support | 2003 |
| Apollo-Rose Management Ltd | Real estate | 2018 |
| Apollonia Dental and Cosmetic Centre Limited | Health & social care | 2008 |