| Anxiety-Free Life Ltd | Education | 2023 |
| Anyscale Limited | Information & communication | 2010 |
| Anything Assist Ltd | Extraterritorial | 2023 |
| Anytime Business Group Ltd | Professional & scientific | 2022 |
| Anytime Care (Supported Living) Ltd | Health & social care | 2021 |
| Anytime Care 2020 Ltd | Health & social care | 2011 |
| Anytime Homes Ltd | Health & social care | 2014 |
| Anytime Properties Ltd | Real estate | 2021 |
| Anytime Recruitment Limited | Administrative & support | 2006 |
| Anytime Recruitment Solutions Ltd | Administrative & support | 2024 |
| Anytimetech UK Ltd | Wholesale & retail | 2023 |
| Anzish Services Limited | Wholesale & retail | 2023 |
| AOA Real Estates Limited | Real estate | 2023 |
| Aoiuk Limited | Other services | 2019 |
| Aotech Limited | Other services | 2019 |
| AP 2017 Limited | Construction | 2017 |
| AP Brothers Ltd | Construction | 2021 |
| AP Car Care Ltd | Administrative & support | 2025 |
| AP Haulage Essex Limited | Transport & logistics | 2025 |
| AP Media Studio Ltd | Information & communication | 2023 |
| AP Mobile Valeting Ltd | Administrative & support | 2024 |
| Ap&Pp Limited | Wholesale & retail | 2025 |
| APC London Market Limited | Financial services | 2006 |
| Aperitivo Digestivo Ltd | Wholesale & retail | 2025 |
| Aperture Agency Ltd | Professional & scientific | 2025 |
| Apex Car Traders Limited | Wholesale & retail | 2025 |
| Apex Double Glazing Limited | Construction | 2011 |
| Apex Extra Company Limited | Wholesale & retail | 2013 |
| Apex Integrated Services Ltd | Administrative & support | 2014 |
| Apex Junction Ltd | Wholesale & retail | 2015 |
| Apex Lead Generation Ltd | Professional & scientific | 2026 |
| Apex Management Consultancy Ltd | Education | 2017 |
| Apex Media Group Ltd | Professional & scientific | 2026 |
| Apex MEP Ltd | Construction | 2024 |
| Apex Outcomes Limited | Professional & scientific | 2026 |
| Apex Property Solutions (London) Limited | Construction | 2025 |
| Apex Rehab Limited | Other services | 2011 |
| Apex Square Ltd | Construction | 2022 |
| Apex Tech Services Ltd | Other services | 2026 |
| Apiary Logistics Ltd | Transport & logistics | 2026 |
| APM (UK) Construct Ltd | Construction | 2023 |
| APM Brickwork Ltd | Construction | 2025 |
| APM London Limited | Wholesale & retail | 2024 |
| Apollo Marketing Group Ltd | Professional & scientific | 2025 |
| Apollo Nails & Spa (CH) Limited | Other services | 2022 |
| Apolonia 1925 Limited | Hospitality | 2024 |
| Apostoleanu Loft Ltd | Construction | 2022 |
| Appachi Restaurant Ltd | Hospitality | 2017 |
| Appan Ltd | Construction | 2022 |
| Apparelable Ltd | Wholesale & retail | 2025 |
| Appiah AI Limited | Information & communication | 2026 |
| Apple & INK Ltd | Administrative & support | 2010 |
| Apple Properties Investment Ltd | Real estate | 2018 |
| Apple Refurb Limited | Wholesale & retail | 2025 |
| Apple Tree House Developments Limited | Real estate | 2022 |
| Applecake Limited | Real estate | 2004 |
| Appleton Five Consultancy Limited | Information & communication | 2019 |
| Appollo Construction Ltd | Construction | 2018 |
| Apprenticeships Work Limited | Administrative & support | 2011 |
| Appro Tech Limited | Information & communication | 2025 |
| Appropriate Care Solutions Limited | Public administration | 2023 |
| Approved Services OS Limited | Construction | 2024 |
| APRIL88 Ltd | Transport & logistics | 2019 |
| APS Build Ltd | Construction | 2025 |
| APS Fire Limited | Professional & scientific | 2024 |
| Apsys Limited | Information & communication | 2010 |
| Aptus Brokers Limited | Financial services | 2014 |
| AQM Properties Limited | Real estate | 2023 |
| AQS Advisory Limited | Professional & scientific | 2025 |
| Aqua Destillata Ltd | Manufacturing | 2025 |
| Aqua Shower Panels Ltd | Wholesale & retail | 2026 |
| AQUA4LIFE Ltd | Wholesale & retail | 2025 |
| Aquarian Builders Limited | Construction | 2011 |
| Aquasphere Diving Center Ltd | Administrative & support | 2025 |
| Aquaz Limited | Real estate | 2018 |
| AR Automobiles Ltd | Professional & scientific | 2024 |
| AR Capital Realty Limited | Real estate | 2026 |
| AR Investments Holding Ltd | Real estate | 2024 |
| AR Professions Limited | Transport & logistics | 2025 |
| AR ROUTE1 Limited | Hospitality | 2024 |
| AR Start-Ups Ltd | Transport & logistics | 2025 |
| AR Wood Work Limited | Construction | 2025 |
| Ar-Riddoh Investments Limited | Real estate | 2022 |
| AR9 Ltd | Information & communication | 2013 |
| ARA Business Ltd | Information & communication | 2011 |
| ARA Health & Wellness Ltd | Professional & scientific | 2026 |
| Arab House for Care of Victims of WAR Ltd | Health & social care | 2026 |
| Arab Tours Limited | Administrative & support | 1977 |
| Arabeena Real Estates Limited | Real estate | 2019 |
| Arabica Group Limited | Education | 2019 |
| Arada Enterprise Limited | Transport & logistics | 2018 |
| Arada London Group Ltd | Wholesale & retail | 2025 |
| Arak Services Solutions Ltd | Information & communication | 2023 |
| Aram Driving Limited | Education | 2023 |
| Aramis Dinasty Ltd | Construction | 2018 |
| Arazi Tech Ltd | Information & communication | 2025 |
| ARB Medical Limited | Health & social care | 2016 |
| ARB Planning Ltd | Construction | 2012 |
| Arborail Ltd | Construction | 2025 |
| ARC Meridian Manpower Ltd | Administrative & support | 2022 |