| ADC Buildings Limited | Construction | 2016 |
| ADC Pressure Washing Ltd | Administrative & support | 2022 |
| Adelphi Court Ltd | Real estate | 2022 |
| Aden Development Limited | Real estate | 2020 |
| ADH Housing Ltd | Real estate | 2024 |
| Adinath Limited | Information & communication | 2010 |
| Adithyaa Estates Ltd | Real estate | 2026 |
| Adithyaa Property Ltd | Real estate | 2021 |
| ADK Social Investment Ltd | Administrative & support | 2014 |
| Adra Support Services Ltd | Administrative & support | 2023 |
| Adventine Associates Ltd | Professional & scientific | 2014 |
| Advice UP Consulting Ltd | Other services | 2022 |
| Advisx Ltd | Professional & scientific | 2025 |
| Ady’S Driving School Ltd | Education | 2025 |
| AEA Locums Limited | Public administration | 2020 |
| Aelectrical Expert Ltd | Construction | 2025 |
| Aerys Active Ltd | Wholesale & retail | 2025 |
| Aesthetics by Reena Ltd | Health & social care | 2019 |
| Aevi Real Estate Group Ltd | Real estate | 2023 |
| Aezon Group Ltd | Wholesale & retail | 2025 |
| AF Power Investment Ltd | Real estate | 2024 |
| Affinity 2000 Limited | Extraterritorial | 1996 |
| Affirm Property Investments Limited | Real estate | 2024 |
| African Innovation Alliance (Afia) Ltd | Professional & scientific | 2019 |
| After Beef Limited | Wholesale & retail | 2024 |
| AGE Concern Kingston Upon Thames | Health & social care | 1988 |
| Aghapy TV Limited | Other services | 2005 |
| Ahmad Halal Meat Ltd | Wholesale & retail | 2014 |
| AHS Bricks Limited | Real estate | 2025 |
| Aifian Co Limited | Wholesale & retail | 2023 |
| Air Business Consultants Holding Ltd | Wholesale & retail | 2019 |
| Airosaurus Limited | Real estate | 2023 |
| Aixkm Ltd | Professional & scientific | 2026 |
| Ajmera Property Management Ltd | Real estate | 2024 |
| AJS Boiler Spares Ltd | Wholesale & retail | 2020 |
| AJS Fuel Ltd | Wholesale & retail | 2018 |
| Ajukim Ltd | Real estate | 2024 |
| AK Chicken World Ltd | Hospitality | 2022 |
| AK Crest Ltd | Real estate | 2025 |
| Akaso Ltd | Wholesale & retail | 2021 |
| AKC Holdings Group Ltd | Real estate | 2023 |
| AL Habib Trading Limited | Transport & logistics | 2016 |
| AL Hamra Palaces Properties Ltd | Financial services | 2024 |
| AL Tanoor Ltd | Other services | 2020 |
| AL Waffa Property Services Ltd | Households | 2024 |
| Al-Alewi Holdings Limited | Wholesale & retail | 2025 |
| Al-Rawi Catering Limited | Hospitality | 2021 |
| AL25 Associates Ltd | Professional & scientific | 2025 |
| Alan Clark Ltd | Construction | 2017 |
| Alan Frederick Lock Ltd | Real estate | 2021 |
| ALB Minicoaches Ltd | Transport & logistics | 2011 |
| Albin Szot Ltd | Health & social care | 2019 |
| Alexandra Management Limited | Households | 1980 |
| Alexdelmont Limited | Information & communication | 2016 |
| Alexia Game Limited | Wholesale & retail | 2022 |
| Alfa Five Securities Limited | Financial services | 2015 |
| Alhadath News Group Ltd | Information & communication | 2014 |
| ALI Commerce Ltd | Wholesale & retail | 2023 |
| ALI Consulting Ltd. | Information & communication | 2015 |
| ALI Warner Editorial Limited | Information & communication | 2012 |
| Aliance London Limited | Other services | 2013 |
| Align Studio Limited | Professional & scientific | 2017 |
| ALL 5 Basketball Limited | Education | 2022 |
| ALL Round Inflatables Ltd | Arts & recreation | 2026 |
| Allaraj Construction Ltd | Construction | 2023 |
| Allbars Vaping Ltd | Wholesale & retail | 2022 |
| Allen & Aiden Limited | Real estate | 2018 |
| Allison Ecommerce LP | | 2011 |
| Alloure Estates Limited | Real estate | 2023 |
| Alluvion Consulting Ltd | Professional & scientific | 2020 |
| Almiak Limited | Wholesale & retail | 2021 |
| Alpha & Omega Consultants Limited | Professional & scientific | 2013 |
| Alpha Lupa Ltd | Professional & scientific | 2024 |
| Alreem Bakery Ltd | Hospitality | 2025 |
| Alreem Lebanese Cuisine Ltd | Hospitality | 2021 |
| Alric Consulting Ltd | Professional & scientific | 2020 |
| Alsaray Limited | Hospitality | 2023 |
| ALU Pro Roofing Ltd | Construction | 2019 |
| Alverstone Road Management Limited | Households | 2024 |
| Alvindla Ltd | Health & social care | 2013 |
| Alvor Estates Limited | Real estate | 1999 |
| AM Building & Management Limited | Construction | 2014 |
| AM Propsol Limited | Real estate | 2025 |
| Aman Food & Wine Ltd | Wholesale & retail | 2024 |
| Amanah Media Ltd | Professional & scientific | 2024 |
| AMB Barbers Limited | Other services | 2025 |
| Amberwood Group Ltd | Professional & scientific | 2024 |
| AMD Interiors Ltd | Professional & scientific | 2023 |
| Amea Metals Ltd | Wholesale & retail | 2022 |
| Amesbury Consulting Ltd | Professional & scientific | 2025 |
| Amhc Limited | Real estate | 2021 |
| Amhor Limited | Construction | 2022 |
| Amicons Ltd | Wholesale & retail | 2024 |
| Amigo Real Estate Limited | Real estate | 2020 |
| Ampacc Ltd | Extraterritorial | 2022 |
| Ampublicity Limited | Professional & scientific | 2008 |
| Anathallo Limited | Professional & scientific | 2022 |
| Andrew & Law Limited | Professional & scientific | 2017 |
| Andy Downey Consulting Ltd | Financial services | 2013 |
| Andy Magic Ltd | Construction | 2025 |