| Anglez Solutions Ltd | Health & social care | 2019 |
| Anglo Liners Ltd | Construction | 2012 |
| Anglo Saxon Pizzaria Limited | Hospitality | 2018 |
| Anisha Nazir Ltd | Health & social care | 2024 |
| Anisha Retail Ltd | Wholesale & retail | 2023 |
| ANN News Ltd | Wholesale & retail | 2020 |
| Anna and Sean Ltd | Real estate | 2023 |
| Another Brick Wall Limited | Construction | 2019 |
| Ansata Hire Solutions Limited | Administrative & support | 2014 |
| Ansty Development Vehicle LLP | | 2019 |
| Antler Management Systems Limited | Information & communication | 2024 |
| Antomar Trans Ltd | Transport & logistics | 2019 |
| Antony Keen Ltd | Construction | 2019 |
| Antyjo International Ltd | Wholesale & retail | 2020 |
| ANY Ride Ltd | Transport & logistics | 2018 |
| ANZ Cars Limited | Wholesale & retail | 2018 |
| AO Wash and Valet Ltd | Wholesale & retail | 2026 |
| AOC Compliance Services Limited | Administrative & support | 2026 |
| AOR Property Group Ltd | Construction | 2024 |
| AOW Studio Ltd | Wholesale & retail | 2022 |
| AP Bashford Mortgages Ltd | Financial services | 2024 |
| AP Bespoke Joinery Ltd | Manufacturing | 2015 |
| Apaca Properties Management Limited | Households | 2025 |
| Apeture Co Ltd | Professional & scientific | 2025 |
| Apex 223 Ltd | Professional & scientific | 2026 |
| Apex Compliance Limited | Other services | 2021 |
| Apex Limited | Professional & scientific | 1995 |
| Apex Premises Limited | Real estate | 2024 |
| Apex Ttls Ltd | Other services | 2022 |
| Apex Visuals Ltd | Information & communication | 2018 |
| Apexstride Ventures Limited | Real estate | 2024 |
| Apfibres Ltd | Construction | 2023 |
| APH GAS Services Limited | Wholesale & retail | 2007 |
| APH Lettings Ltd | Real estate | 2025 |
| API Developments Limited | Professional & scientific | 2018 |
| APM Direct Couriers Ltd | Transport & logistics | 2021 |
| APM Services (SY) Ltd | Construction | 2022 |
| Apna HAQ Limited | Health & social care | 2004 |
| Apna Real Estate Ltd | Real estate | 2023 |
| Apna Travel & Tours Ltd | Administrative & support | 2021 |
| Apna Travel Limited | Administrative & support | 2016 |
| Apollopowders Limited | Manufacturing | 2025 |
| Appex Property Group Ltd | Real estate | 2025 |
| Apple & BEE Design Limited | Manufacturing | 2013 |
| Apple & BEE Limited | Professional & scientific | 2016 |
| Appleby Homes Limited | Real estate | 2016 |
| Appleton Training & Assessing Solutions Ltd | Professional & scientific | 2024 |
| Applied Biotech Ltd | Manufacturing | 2018 |
| Applied Power Engineering Limited | Manufacturing | 2001 |
| Applied Power Holdings Limited | Professional & scientific | 2013 |
| Approved Auto's by KGN Ltd | Wholesale & retail | 2025 |
| APR Electrical Solutions Ltd | Manufacturing | 2012 |
| APS Associates Consulting Engineers Ltd | Construction | 2010 |
| APS Surveying Services Limited | Professional & scientific | 2002 |
| Aptionix Limited | Information & communication | 2025 |
| AQ Car Sales Limited | Wholesale & retail | 2018 |
| AQ Holdings Group Ltd | Financial services | 2026 |
| AQ Properties Management Ltd | Real estate | 2024 |
| Aqua Group Ltd | Professional & scientific | 2018 |
| Aqua Staffs Ltd | Construction | 2024 |
| Aqua Tanks Limited | Construction | 2023 |
| Aquachem Ltd | Manufacturing | 2023 |
| AR and SH FC Ltd | Hospitality | 2026 |
| AR Beauty Ltd | Other services | 2018 |
| AR Business Centre Ltd | Administrative & support | 2025 |
| AR Drywall Limited | Construction | 2019 |
| AR Holdings and Investments Ltd | Financial services | 2026 |
| Arba Investments (Management) Ltd | Real estate | 2019 |
| Arba Investments Limited | Real estate | 2015 |
| Arbbat Consultancy Ltd | Professional & scientific | 2026 |
| ARC Commercial Developments Ltd | Construction | 2024 |
| ARC Engineering Services Ltd | Construction | 2025 |
| ARC Metrology Ltd | Professional & scientific | 2019 |
| ARC Metrology Services Ltd | Professional & scientific | 2023 |
| Arcadia Transport Limited | Transport & logistics | 2024 |
| Arcave Technologies Ltd | Education | 2025 |
| Arccass Limited | Manufacturing | 2017 |
| Arch & GEO Ltd | Wholesale & retail | 2019 |
| Arch Drywall Limited | Construction | 2012 |
| Arch Pilates Limited | Arts & recreation | 2026 |
| Archam Construction Limited | Construction | 2018 |
| Archers (Bedworld) Limited | Wholesale & retail | 2003 |
| Archers Investment Company Limited | Wholesale & retail | 2023 |
| Archers Upholstery Limited | Manufacturing | 2023 |
| Archie Capital Ltd | Other services | 2021 |
| Archie Smith Services Ltd | Construction | 2016 |
| Architectural Decorative Facades Ltd | Professional & scientific | 2011 |
| Architectural Plastering & Building Services Ltd | Manufacturing | 2012 |
| Archive: 808 Ltd | Information & communication | 2022 |
| Arcs Investments Limited | Real estate | 2008 |
| Arda Express Ltd | Transport & logistics | 2025 |
| Ardek Properties Ltd | Real estate | 2021 |
| AREA63 Ltd | Manufacturing | 2026 |
| Arenda Lettings Ltd | Real estate | 2026 |
| Argent Pair Ltd | Other services | 2026 |
| Argin Ltd | Manufacturing | 2022 |
| ARI Spedition Limited | Transport & logistics | 2019 |
| Aria Fire and Security Doors Ltd | Construction | 2018 |
| Aria Franks Ltd | Financial services | 2022 |
| ARK Joinery Limited | Construction | 2022 |