| Akshdeep Estates Ltd | Real estate | 2025 |
| Akshdeep Ltd | Information & communication | 2015 |
| AL Omran United Maritime Services & Logistics Co Ltd | Transport & logistics | 2022 |
| AL Rayan Food Centre Ltd | Wholesale & retail | 2025 |
| ALB Design & Construction Ltd | Construction | 2024 |
| Albion Meat Supplies Limited | Wholesale & retail | 2019 |
| Alfa Real Properties Limited | Real estate | 2023 |
| ALFA9 Ltd | Construction | 2023 |
| ALI Asghar Estates Ltd | Real estate | 2026 |
| Alif Advisory & Management Services Ltd | Professional & scientific | 2026 |
| Alif Advisory Ltd | Professional & scientific | 2026 |
| Alif Group Global Ltd | Financial services | 2026 |
| ALL Exterior Cleaning Ltd | Administrative & support | 2023 |
| ALL GAS and Heating Services Ltd | Construction | 2023 |
| ALL Property Services 4YOU Ltd | Administrative & support | 2023 |
| Allchurch Plastering Limited | Construction | 2021 |
| Allium Global Ventures Ltd | Wholesale & retail | 2025 |
| Alpha One Diagnostics and Repairs Ltd | Wholesale & retail | 2022 |
| Alta Botanica Ltd | Wholesale & retail | 2026 |
| Altair Data Sciences Ltd | Information & communication | 2025 |
| Alterations Atelier Ltd | Wholesale & retail | 2021 |
| Alto Claritas Ltd | Professional & scientific | 2020 |
| Altosvale Ltd | Wholesale & retail | 2025 |
| AMA 1 Ltd | Financial services | 2023 |
| Amafhh Property Ltd | Real estate | 2023 |
| Amarcord Media Ltd. | Information & communication | 2008 |
| Ambala Sweets Morden Ltd | Hospitality | 2025 |
| Amethyst Property Limited | Real estate | 2018 |
| Ametrine Developments Limited | Real estate | 2021 |
| AMG Finance (Leicester) Ltd | Professional & scientific | 2016 |
| AMM Spice Ltd | Hospitality | 2019 |
| Amraf Limited | Information & communication | 2024 |
| AN Urban Rose Ltd | Wholesale & retail | 2022 |
| Analyst Ltd | Professional & scientific | 2015 |
| Analytics 4 Growth Ltd | Professional & scientific | 2024 |
| Anderson MPT Ltd | Households | 2024 |
| Andy Callan Photography Limited | Extraterritorial | 2012 |
| Angeline WP Ltd | Other services | 2019 |
| Anjana Consultancy Limited | Information & communication | 2017 |
| ANL C&D Ltd | Construction | 2025 |
| Anlina Ltd | Households | 2021 |
| ANN Bird Retail Ltd | Wholesale & retail | 2025 |
| Anna Salons Kingston Ltd | Other services | 2021 |
| Annette Farrell Property Limited | Households | 2019 |
| Another Window Company Ltd | Manufacturing | 2026 |
| Antiparos Ltd | Wholesale & retail | 2021 |
| AO Organics Ltd | Manufacturing | 2025 |
| Apex & Co Limited | Information & communication | 2013 |
| Apex Business Advisors Limited | Professional & scientific | 2023 |
| Apex Couriers Ltd | Transport & logistics | 2015 |
| Apollo AV Care Ltd | Health & social care | 2024 |
| Apply Compliance Today Limited | Professional & scientific | 2016 |
| Apro Footwear Ltd | Wholesale & retail | 2014 |
| ARC Air Ltd | Construction | 2026 |
| Archer MED Limited | Information & communication | 2020 |
| Archi-Tex Architectural Sevices Limited | Professional & scientific | 2013 |
| Architecture in Glass Limited | Professional & scientific | 1995 |
| Arcvision Consulting Ltd | Information & communication | 2021 |
| ARD Contractors Ltd | Construction | 2013 |
| Arekatla Homes Ltd | Real estate | 2026 |
| Arena Search Ltd | Real estate | 2017 |
| Ariam Ltd | Administrative & support | 2013 |
| Ariana Accountancy Services Ltd | Professional & scientific | 2017 |
| Arivuneri Ltd | Education | 2020 |
| Arkitectas Limited | Information & communication | 2016 |
| Armadale Associates Ltd | Administrative & support | 2017 |
| Armand Direct Ltd | Wholesale & retail | 2020 |
| ARN Solutions Ltd | Information & communication | 2015 |
| Arthur Mohill Ltd | Real estate | 2022 |
| Arupa Investments Ltd | Real estate | 2025 |
| Asad Bookkeeping Services Ltd | Professional & scientific | 2013 |
| Ashbourne Partners Ltd | Professional & scientific | 2025 |
| Ashraf Property Management LLP | | 2020 |
| Ashrita Properties Limited | Real estate | 2022 |
| Ashuk Service Ltd | Wholesale & retail | 2019 |
| ASJ Property Management Limited | Real estate | 2016 |
| Asrin Ltd | Wholesale & retail | 2025 |
| Assetsafe Group Ltd | Financial services | 2026 |
| Associate Corporate Communications Ltd | Professional & scientific | 2022 |
| Assured (APS) Limited | Information & communication | 2014 |
| Athleva Limited | Health & social care | 2024 |
| Atlantica Consulting Ltd | Professional & scientific | 2020 |
| Atlantix Associates Ltd | Financial services | 2010 |
| Atlas Rope Access Ltd | Construction | 2025 |
| Atom Grip Services Limited | Information & communication | 2008 |
| Atozen AI Ltd | Information & communication | 2026 |
| Aurbal Corporate Ltd | Wholesale & retail | 2020 |
| Aurelius Growth Partners Limited | Professional & scientific | 2026 |
| Aurum Flooring Ltd | Construction | 2025 |
| Auto Grant Ltd | Wholesale & retail | 2025 |
| Auto Valeting Ltd | Administrative & support | 2023 |
| Autoflix UK Limited | Wholesale & retail | 2023 |
| AVH Convenience Store Ltd | Wholesale & retail | 2020 |
| Avra Kitchen Ltd | Hospitality | 2024 |
| Awan Softworks Ltd. | Wholesale & retail | 2016 |
| AWE Pro Ltd | Real estate | 2014 |
| Axus Technologies Ltd | Information & communication | 2019 |
| Ayra Consultancy Services Limited | Information & communication | 2015 |
| Azhar Ahmad Trader Ltd | Transport & logistics | 2020 |
| Azimian Trading Ltd | Wholesale & retail | 2025 |