| Ajpharm Ltd | Professional & scientific | 2009 |
| Ajumose EKO Limited | Professional & scientific | 2022 |
| AK Commercials Properties Limited | Real estate | 2024 |
| AK UK Properties Ltd | Real estate | 2024 |
| AKD Real Estates Ltd | Real estate | 2024 |
| Akila Bully Camp K9 Ltd | Agriculture & fishing | 2019 |
| Akshar Construction UK Ltd | Construction | 2025 |
| Akshar Private Limited | Wholesale & retail | 2019 |
| Akuko Studio Ltd | Professional & scientific | 2025 |
| AKV Property Limited | Real estate | 2024 |
| Akzent Limited | Information & communication | 2021 |
| AL Fajar Trade Ltd | Wholesale & retail | 2025 |
| AL Haya London Limited | Wholesale & retail | 2023 |
| AL Khaleel Education Limited | Education | 2016 |
| AL Mansura Ltd | Wholesale & retail | 2022 |
| AL Riaz Ltd | Information & communication | 2024 |
| AL Spotless Clean Ltd | Administrative & support | 2026 |
| AL- Khaleel Events Ltd | Hospitality | 2024 |
| AL- Khaleel Tours Ltd | Administrative & support | 2021 |
| Al-Hamd Halal Meat Limited | Wholesale & retail | 2020 |
| Al-Muez Limited | Real estate | 2019 |
| Al.Saraa Limited | Wholesale & retail | 2026 |
| Albus James Ltd | Administrative & support | 2014 |
| Alchemist Candles Ltd | Manufacturing | 2020 |
| Aleksandra 2011 Ltd | Construction | 2016 |
| Alex Building Limited | Construction | 2017 |
| Alex Eco Ltd | Water & waste | 2026 |
| Alexandra Charles Ltd | Real estate | 2022 |
| ALI Shan Online Ltd | Information & communication | 2025 |
| Alien Car Hire Ltd | Administrative & support | 2025 |
| Alife Trading Limited | Wholesale & retail | 2018 |
| Alifiyaan Ltd | Transport & logistics | 2023 |
| ALL London Maintenance Ltd | Construction | 2022 |
| ALL Occasion Cards Limited | Wholesale & retail | 2009 |
| ALL Things Live Ltd | Professional & scientific | 2024 |
| ALL Things Pcassie Limited | Wholesale & retail | 2023 |
| Allanson Ventures Limited | Administrative & support | 2017 |
| Allfor Care Ambulance Limited | Health & social care | 2025 |
| Allick and Sons Limited | Wholesale & retail | 2023 |
| Allscan Limited | Information & communication | 1995 |
| Allstars Activity Club Ltd | Education | 2016 |
| Almudena Becerra Esteban Longest Services Ltd | Construction | 2025 |
| Alpha Digital Marketing Services Ltd | Information & communication | 2019 |
| Alpha Logistics Solutions Ltd | Other services | 2012 |
| Alphabet Speech and Language Therapy Ltd | Health & social care | 2019 |
| Alsters Limited | Health & social care | 2020 |
| Altakal Limited | Hospitality | 2021 |
| Altakal Services Ltd | Hospitality | 2021 |
| Alterbloom Ltd | Professional & scientific | 2026 |
| Altitude Coffee Truck Ltd | Wholesale & retail | 2024 |
| Always Healthcare Recruitment Agency Ltd | Administrative & support | 2017 |
| AM Afro Caribbean Tingz Ltd | Wholesale & retail | 2026 |
| AM IPP Ltd | Wholesale & retail | 2024 |
| Amanah Academy Send Inclusion Ltd | Education | 2025 |
| Amatullahs Food HUT Ltd | Hospitality | 2019 |
| Amazing Grace Childcare Ltd | Health & social care | 2015 |
| Amazinics Ltd | Wholesale & retail | 2024 |
| AMB Construct Ltd | Manufacturing | 2021 |
| Ambipark Property Limited | Real estate | 2022 |
| AMC Auto Services Ltd | Wholesale & retail | 2008 |
| AMC Autos Ltd | Wholesale & retail | 2022 |
| AMC Tyres Ltd | Wholesale & retail | 2017 |
| Amenieta ICT Solutions Limited | Manufacturing | 2011 |
| Aminata Koroma Limited | Wholesale & retail | 2025 |
| Amirabak Ventures Limited | Wholesale & retail | 2025 |
| Ammcass Limited | Construction | 2008 |
| Amna Transport and Services Ltd | Transport & logistics | 2023 |
| Amointernational Ltd | Wholesale & retail | 2025 |
| Ampaw Properties Ltd | Real estate | 2024 |
| Amrutha on Road Ltd | Hospitality | 2024 |
| AMX Trade Ltd | Construction | 2026 |
| AMX Trading Ltd | Wholesale & retail | 2025 |
| Anastasia Logistics Ltd | Transport & logistics | 2019 |
| Anchorpoint Solutions Ltd | Professional & scientific | 2025 |
| Andrea Myers Beauty Ltd | Other services | 2023 |
| Andrew Jackson Gardens Ltd | Construction | 2015 |
| Andrews Roofing Ltd | Construction | 2026 |
| Angel Education Ltd | Education | 2013 |
| Angel Events and Decor Limited | Hospitality | 2023 |
| Angel Funeral of Surrey Ltd | Other services | 2022 |
| Angels Unlimited Nurseries Ltd. | Education | 2014 |
| Anita Essentials Ltd | Other services | 2026 |
| Aniva Foods Ltd | Wholesale & retail | 2019 |
| Annie International Ltd | Wholesale & retail | 2026 |
| Anointed Apostolic Church | Other services | 2009 |
| Anotherstep Ltd | Education | 2023 |
| Anraha Limited | Hospitality | 2010 |
| Anthony Budall Construction Ltd | Construction | 2019 |
| Anthony Chung Electrical Services Limited | Construction | 2013 |
| Anthony Property Security Ltd | Households | 2025 |
| Antonel and Sons Ltd | Construction | 2024 |
| ANU Galaxy Ltd | Wholesale & retail | 2025 |
| ANV Construction Ltd | Construction | 2018 |
| Anwar Bhatti and Co Ltd | Professional & scientific | 2025 |
| Anythingoesimportant&Export Limited | Transport & logistics | 2025 |
| Aoom Ltd | Information & communication | 2011 |
| Ap's Assets Ltd | Real estate | 2020 |
| Apex Customization Ltd | Wholesale & retail | 2022 |
| Apex Guard Security Ltd | Administrative & support | 2026 |
| Apex König Ltd | Wholesale & retail | 2026 |