| Anywhere Academy International Ltd | Education | 2017 |
| AP Auto Solutions Ltd. | Transport & logistics | 2014 |
| AP Pharmaceuticals Ltd | Health & social care | 2022 |
| AP Solar Ltd | Information & communication | 2025 |
| Apache Automation Limited | Professional & scientific | 2018 |
| Aperio Law & HR Limited | Professional & scientific | 2023 |
| Apex Children Services Ltd | Health & social care | 2025 |
| Apex Domestic Repairs Limited | Other services | 2025 |
| Apex Gymwear Ltd | Wholesale & retail | 2025 |
| Apex Homes Developments Ltd | Construction | 2026 |
| Apex Legal Consultancy Ltd | Professional & scientific | 2026 |
| Apex Logistics (UK) Limited | Transport & logistics | 2003 |
| Apex Motorhaus Ltd | Wholesale & retail | 2024 |
| Apex Specialist Education Ltd | Education | 2023 |
| Apex Stratum Holdings Limited | Financial services | 2026 |
| Apex Stratum Trading Limited | Professional & scientific | 2026 |
| Apex Supplies UK Limited | Administrative & support | 2001 |
| Apex Umbrella Limited | Health & social care | 2019 |
| Apexl Ltd | Wholesale & retail | 2024 |
| Apexmotormechanics Ltd | Wholesale & retail | 2025 |
| APH Direct Limited | Wholesale & retail | 2025 |
| API Wholesale Ltd | Wholesale & retail | 2026 |
| APL Cleaning Limited | Other services | 2012 |
| Apna Tandoori Ltd | Hospitality | 2025 |
| App Factory Limited | Information & communication | 2020 |
| Applaud Properties Limited | Real estate | 2016 |
| Applewood Developments (Lancs) Ltd | Administrative & support | 2005 |
| Applewood Developments Group Ltd | Administrative & support | 2023 |
| Appliance Solutions Limited | Water & waste | 2017 |
| Appliances 21 Limited | Wholesale & retail | 2024 |
| Appliances Sinks and Taps Limited | Wholesale & retail | 2013 |
| Application Tape Company Limited | Manufacturing | 2003 |
| Applied Fitness Limited | Arts & recreation | 2023 |
| Applyd AI Ltd | Information & communication | 2026 |
| Aprex Consultancy Limited | Administrative & support | 2013 |
| April House Rental Ltd | Real estate | 2025 |
| AQ Physio Assist Ltd | Other services | 2017 |
| Aqil Inayat Limited | Health & social care | 2016 |
| Aquamark Trading Ltd | Construction | 2015 |
| Aquatectum Limited | Construction | 2026 |
| Aqueos Care Ltd | Wholesale & retail | 2010 |
| Aquire Digital Ltd. | Professional & scientific | 2019 |
| AR Bespoke Composite and Bifolding Doors Ltd | Construction | 2026 |
| AR Hometex Limited | Manufacturing | 2022 |
| AR Ophthalmic Ltd | Health & social care | 2015 |
| AR Organisations Ltd | Wholesale & retail | 2024 |
| AR Professional Assessments Ltd | Health & social care | 2022 |
| AR Qavi Ltd | Transport & logistics | 2024 |
| AR Technology Group Ltd | Financial services | 2025 |
| AR Windows & Glass Limited | Construction | 2016 |
| Arab Skilled Professionals and Technicians Union Ltd | Professional & scientific | 2026 |
| Arabesque Clothing Limited | Real estate | 2011 |
| Arain & Co Ltd | Wholesale & retail | 2026 |
| Aran Pro Ltd | Wholesale & retail | 2025 |
| Arash HB Barbers Ltd | Other services | 2025 |
| Arash Walk in Barbers Ltd | Other services | 2021 |
| Arauf Ventures Ltd | Wholesale & retail | 2022 |
| ARC Group International Ltd | Information & communication | 2025 |
| ARC Painting and Decorating Ltd | Construction | 2019 |
| Arch 19 (Manchester) Limited | Hospitality | 2026 |
| Archiv'D Ltd | Wholesale & retail | 2023 |
| Archway Group Holdings Ltd | Financial services | 2024 |
| Arcon Ceilings & Partitions Ltd | Construction | 2025 |
| Arctic FOX Studio Ltd | Information & communication | 2006 |
| ARD Leisure MCR Ltd | Other services | 2023 |
| Areeha's Investments Limited | Wholesale & retail | 2020 |
| Arganda Ltd | Transport & logistics | 2025 |
| ARI Brothers Ltd | Real estate | 2023 |
| Aria Birthwear Ltd | Wholesale & retail | 2026 |
| Aria Cash and Carry Ltd | Wholesale & retail | 2013 |
| Aria Global Solutions Ltd | Wholesale & retail | 2025 |
| Aria Halal Meat Ltd | Wholesale & retail | 2025 |
| Ariad Estates Limited | Real estate | 2023 |
| Arien Distribution Limited | Wholesale & retail | 1999 |
| Arimas Holdings Ltd | Real estate | 2016 |
| Aris Elevate Ltd | Professional & scientific | 2024 |
| Aris Telecom Ltd | Wholesale & retail | 2026 |
| Aristea UK Limited | Real estate | 2013 |
| Arizon Ltd | Wholesale & retail | 2023 |
| Arizona Fried Chicken Limited | Hospitality | 2020 |
| ARK Developments NW Ltd | Construction | 2026 |
| Arkadia Brands Limited | Wholesale & retail | 2025 |
| Arkadia Online Ltd | Wholesale & retail | 2025 |
| Arkadia Textiles Limited | Manufacturing | 2026 |
| Arkansas Fried Chicken Ltd | Hospitality | 2025 |
| Arkham Properties Ltd | Construction | 2024 |
| Arkon Trading Ltd | Wholesale & retail | 2026 |
| Arkright Limited | Professional & scientific | 2023 |
| Armada Cider Ltd | Financial services | 2020 |
| Armann Consultants Ltd | Real estate | 2011 |
| ARO Active Limited | Wholesale & retail | 2025 |
| Aroma Glow Cosmetics Ltd | Wholesale & retail | 2026 |
| Aroma Home Services Ltd | Administrative & support | 2026 |
| Aroma Indian Dining Ltd | Hospitality | 2019 |
| Aromafeel Limited | Wholesale & retail | 2025 |
| Aromaflow Candles Ltd | Other services | 2017 |
| Arres Transport Ltd | Transport & logistics | 2019 |
| Arriba Tours UK Ltd | Administrative & support | 2022 |
| Arron Blake Property Investments Ltd | Real estate | 2024 |
| Arron Blake Property Ltd | Real estate | 2026 |