| Aimtarn Limited | Professional & scientific | 1977 |
| Ainc Management Ltd | Professional & scientific | 2020 |
| Aion Advisory Ltd | Professional & scientific | 2024 |
| Aion Search Ltd | Administrative & support | 2020 |
| Air Cargo Prime Logistics Ltd | Transport & logistics | 2022 |
| Air Cube Limited | Real estate | 2023 |
| Air Longfield Limited | Real estate | 2023 |
| Aircon North London Limited | Construction | 2024 |
| AIS Global Ltd | Information & communication | 2024 |
| Aitken Contract Solutions Limited | Professional & scientific | 2018 |
| Aitzah Property Ltd | Real estate | 2026 |
| Aitzah Support Limited | Health & social care | 2014 |
| AJ Electrical Solutions Ltd | Construction | 2022 |
| AJ Fades Ltd | Other services | 2026 |
| AJ Investments Solution Ltd | Real estate | 2023 |
| AJ Leaseplans Limited | Professional & scientific | 2012 |
| AJ Leytonstone Ltd | Hospitality | 2024 |
| AJ Mckenzie Real Estate Ltd | Real estate | 2019 |
| AJ Romford Ltd | Hospitality | 2025 |
| AJ Trading Corporation Limited | Agriculture & fishing | 2023 |
| Aj&Ai Design Studio Ltd | Information & communication | 2026 |
| Ajan Living Ltd | Real estate | 2024 |
| AJC Edgware (NO.2) Ltd | Other services | 2024 |
| Ajeti Holdings Ltd | Financial services | 2024 |
| Ajeya Limited | Administrative & support | 2011 |
| AJF Design Services Ltd | Professional & scientific | 2021 |
| AJF Landscapes & Gardens Ltd | Administrative & support | 2020 |
| Ajkr Investments Ltd | Real estate | 2022 |
| AJR International Limited | Real estate | 2026 |
| AJS Planning Ltd | Professional & scientific | 2021 |
| Ajsuarez Care Limited | Other services | 2013 |
| Aj’S Kitchen Ltd | Hospitality | 2023 |
| AK & Co London Ltd | Other services | 2022 |
| AK Accountancy Services(Uk) Limited | Professional & scientific | 2022 |
| AK Consultancy Services Limited | Professional & scientific | 2021 |
| AK Hotels Ltd | Hospitality | 2022 |
| AK Hull Limited | Wholesale & retail | 2018 |
| AK Mobile Zone Ltd | Wholesale & retail | 2026 |
| AK Secure Tech Ltd | Administrative & support | 2025 |
| Akaay Consulting Services Limited | Professional & scientific | 2026 |
| Akaibara Ltd | Professional & scientific | 2019 |
| Akash Software Solutions Ltd | Information & communication | 2025 |
| Akdeniz Supermarket Edgware Ltd | Wholesale & retail | 2019 |
| AKE Stores Ltd | Wholesale & retail | 2026 |
| Akfixit Limited | Wholesale & retail | 2024 |
| Akhal Care Ltd | Professional & scientific | 2018 |
| AKI & Nishq Ltd | Construction | 2024 |
| AKJ Ventures Ltd | Wholesale & retail | 2019 |
| AKK International Ltd | Manufacturing | 2023 |
| Aklandscaping Ltd | Administrative & support | 2022 |
| AKM Noor Ltd | Other services | 2026 |
| Akms Capital Limited | Real estate | 2017 |
| AKN Estates Limited | Real estate | 2016 |
| AKO Natural Yeast Limited | Manufacturing | 2023 |
| Akrivis Accountancy and Taxation Services Limited | Professional & scientific | 2008 |
| Akshar IO Ltd | Wholesale & retail | 2025 |
| Aksu Food Centre Ltd | Wholesale & retail | 2021 |
| Aktisfon Ltd | Manufacturing | 2018 |
| Akyuru Limited | Financial services | 2025 |
| AL Amal Foundation | Other services | 2022 |
| AL Faris Tourism Ltd | Administrative & support | 2023 |
| AL Khalil Supermarket N06 Ltd | Wholesale & retail | 2025 |
| AL Phoenix Ltd | Construction | 2020 |
| AL Qaswaa Automotive Services (UK) Ltd | Wholesale & retail | 2018 |
| AL Shahad London Ltd | Hospitality | 2023 |
| AL Tenon Ltd | Construction | 2014 |
| Al-Bayt Properties Ltd | Real estate | 2025 |
| Al-Jigaine Courier Services Ltd | Other services | 2021 |
| Al-Mansour Halal Meat Ltd | Wholesale & retail | 2019 |
| Al-Temimi Limited | Real estate | 2021 |
| Aladdin Management Limited | Arts & recreation | 1997 |
| Aladdin Technologies Ltd | Information & communication | 2025 |
| Alaeddine Limited | Hospitality | 2013 |
| Alamin Trade Ltd | Professional & scientific | 2025 |
| Alawaal Limited | Other services | 2021 |
| Albakos Building Services Ltd | Construction | 2017 |
| Albany House (Edgware) Management Company Limited | Real estate | 1979 |
| Albatross HS Ltd | Wholesale & retail | 2020 |
| Albeck Limited | Professional & scientific | 2002 |
| Albemarle Park Property Management Co.Limited | Households | 1967 |
| Albergum Limited | Professional & scientific | 2022 |
| Albermarle Estates Ltd | Real estate | 1996 |
| Alberto Enterprises Ltd | Real estate | 2025 |
| Albeve Enterprise Ltd | Construction | 2018 |
| Albkos Investments Limited | Construction | 2019 |
| Alcock Telly Productions Limited | Information & communication | 2014 |
| Alden Mead RTM Company Limited | Real estate | 2014 |
| Aldermartin Building Contractors Limited | Administrative & support | 2022 |
| Aldermartin Ltd | Extraterritorial | 2016 |
| Aldershot Estates Limited | Real estate | 2016 |
| Aleaf Windows UK Limited | Other services | 2015 |
| Alecssander Construction Ltd | Construction | 2015 |
| Aledom Ltd | Transport & logistics | 2026 |
| Aleees UK Ltd | Manufacturing | 2022 |
| Aleph Studio London Limited | Professional & scientific | 2018 |
| Alex Building Services Ltd | Construction | 2014 |
| Alex Insulation Ltd | Construction | 2025 |
| Alex Interiors Ltd | Construction | 2013 |
| Alex Mirsaney Limited | Construction | 2020 |
| Alex Rosca Ltd | Construction | 2022 |