| Anointed Healthcare Limited | Administrative & support | 2014 |
| ANP Consulting Services Ltd | Administrative & support | 2019 |
| Ansari Corporation Limited | Administrative & support | 2017 |
| Ansari Property (High Wycombe) Limited | Real estate | 2026 |
| Ansells Painting and Decorating Limited | Construction | 2026 |
| Anstow Limited | Professional & scientific | 2012 |
| Answers 2000 Limited | Information & communication | 1998 |
| Antac Support Services Ltd | Administrative & support | 2001 |
| Antares 2012 Ltd | Information & communication | 2012 |
| Antera Kitchens Highwycombe Ltd | Hospitality | 2025 |
| Anthronovaai Limited | Information & communication | 2025 |
| Anti Counterfeiting Group(The) | Administrative & support | 1986 |
| Antiques and More Limited | Wholesale & retail | 2013 |
| Ants Dairy Limited | Wholesale & retail | 2023 |
| Anubix Ltd | Health & social care | 2023 |
| Anunav Limited | Information & communication | 2023 |
| Anveer Limited | Professional & scientific | 2020 |
| Anwara Trading Limited | Transport & logistics | 2020 |
| Anya Consultancy Services Limited | Information & communication | 2014 |
| Anya Investments Limited | Real estate | 2020 |
| Anytime Jewellery Ltd | Manufacturing | 2026 |
| AOD Services Ltd | Transport & logistics | 2024 |
| AP HR Consulting Ltd | Professional & scientific | 2014 |
| AP Panchmatia Ltd | Real estate | 2025 |
| AP Property Consultants Ltd | Construction | 2016 |
| AP3 Limited | Construction | 2016 |
| Apace Solutions Limited | Information & communication | 2014 |
| Apex 804 Ltd | Real estate | 2023 |
| Apex Atelier Ltd | Wholesale & retail | 2026 |
| Apex Coach Lines Ltd | Transport & logistics | 2025 |
| Apex Hvac Services Limited | Professional & scientific | 2020 |
| Apex Investment Advisors Limited | Real estate | 2014 |
| Apex Investment Property Limited | Real estate | 2021 |
| Apex Talent Limited | Professional & scientific | 2025 |
| Apex Temp Solutions Ltd | Administrative & support | 2026 |
| Apex UK Sales Consulting Limited | Professional & scientific | 2026 |
| Apexsol Ltd | Wholesale & retail | 2026 |
| Apexsphere Accounting and Consulting Ltd | Professional & scientific | 2024 |
| Aphrodite Skin Clinic Limited | Other services | 2026 |
| Apicem Systems Limited | Information & communication | 2020 |
| Apmg-International Limited | Extraterritorial | 2012 |
| Apmg-Uk Limited | Extraterritorial | 2007 |
| APN Consultants Ltd | Professional & scientific | 2024 |
| Apollo Consultants Ltd | Administrative & support | 2017 |
| Apollo Leadership Limited | Administrative & support | 2023 |
| Apolo Builders Ltd | Construction | 2023 |
| Apolo Design Ltd | Wholesale & retail | 2020 |
| Aponia CBD Ltd | Wholesale & retail | 2020 |
| App Mechanical Ltd | Construction | 2015 |
| App MTD Ltd | Professional & scientific | 2022 |
| Appdom Ltd | Information & communication | 2021 |
| Apple Property Partners Ltd | Real estate | 2016 |
| Appleby Care (PVT) Ltd | Health & social care | 2019 |
| Appleford Property Company Limited | Real estate | 2016 |
| Applepod Ltd | Real estate | 2021 |
| Applewood Financial Solutions Ltd | Professional & scientific | 2023 |
| Applewood Landscapes Limited | Administrative & support | 2015 |
| Applewood Plant Hire Limited | Administrative & support | 2017 |
| Applewoods Party Wall Limited | Professional & scientific | 2021 |
| Applewoods Surveying Limited | Professional & scientific | 2009 |
| Approach ED Ltd | Education | 2023 |
| Appslink Ltd | Information & communication | 2013 |
| April & June Ltd | Wholesale & retail | 2025 |
| April Close Management Limited | Households | 1981 |
| April Cottage Enterprises Ltd | Other services | 2022 |
| April Flowers Legal Services Ltd | Professional & scientific | 2020 |
| Apsley Manor Property Limited | Real estate | 2020 |
| APT Practice Limited | Health & social care | 2021 |
| Aptechuk Limited | Information & communication | 2015 |
| Aptum Consultancy Services Ltd | Professional & scientific | 2020 |
| Aqas Global Ltd | Wholesale & retail | 2022 |
| Aqeel CAB Services Limited | Transport & logistics | 2019 |
| AQI Limited | Real estate | 2012 |
| Aqsa Motors Ltd | Wholesale & retail | 2023 |
| Aqua Detox USA Ltd | Manufacturing | 2012 |
| Aqua Ignis Limited | Energy | 2012 |
| Aqua-Dial Limited | Extraterritorial | 1982 |
| Aqualith Ltd | Wholesale & retail | 2025 |
| Aquarius (Marlow) Window Cleaning Limited | Administrative & support | 2006 |
| Aquastal Limited | Water & waste | 1983 |
| AR (High Wycombe) Ltd | Real estate | 2016 |
| AR Global Distribution Ltd | Wholesale & retail | 2025 |
| AR Harper Limited | Hospitality | 2023 |
| AR Investment Property Limited | Real estate | 2017 |
| AR Kairo Ltd | Wholesale & retail | 2026 |
| AR Property & Renewables Services Limited | Construction | 2026 |
| AR Trustees Limited | Administrative & support | 2021 |
| Arabi's Ltd | Information & communication | 2020 |
| Arabian Gulf Consulting Information Bureau | | 1986 |
| Arabian Scents Ltd | Wholesale & retail | 2025 |
| Aranthai Brit Solutions Ltd | Information & communication | 2025 |
| Arayes Construction Ltd | Construction | 2020 |
| Arbourtech Services Limited | Construction | 2002 |
| ARC Baron Limited | Construction | 2017 |
| ARC Brand Consultancy Ltd | Professional & scientific | 2025 |
| Archer Corporate Finance Limited | Professional & scientific | 2019 |
| Arches Store Ltd | Wholesale & retail | 2007 |
| Architainment Lighting Limited | Wholesale & retail | 2003 |
| Architecture Manufacturing Construction Ltd | Manufacturing | 2025 |
| Architecture Structure Build Limited | Construction | 2023 |