| Amit (London) Ltd | Wholesale & retail | 2023 |
| AMK Asset Ltd | Administrative & support | 2025 |
| AMK Services 247 Ltd | Transport & logistics | 2026 |
| Amma Fresh Meat Limited | Wholesale & retail | 2026 |
| Ammi Residentials Ltd | Real estate | 2022 |
| AMN Construction Ltd | Construction | 2026 |
| AMN Premier Services Ltd | Wholesale & retail | 2020 |
| Amore Foods Limited | Hospitality | 2016 |
| Amore Pizza Ltd | Hospitality | 2017 |
| Amoureux Limited | Wholesale & retail | 2020 |
| Ampikeja Limited | Real estate | 2025 |
| Ampikeya Limited | Hospitality | 2022 |
| Ample Ebusiness Ltd | Information & communication | 2023 |
| Amrik & Sons Limited | Transport & logistics | 2014 |
| Amrik Chopra Ltd | Wholesale & retail | 2025 |
| Amrit Property Developments Ltd | Real estate | 2021 |
| Amritsar Construction Limited | Construction | 2025 |
| AMS Academy Ltd | Other services | 2024 |
| AMS Investments (London) Limited | Real estate | 2016 |
| AMS Traders Ltd | Wholesale & retail | 2022 |
| Amsquare Ltd | Real estate | 2024 |
| AMU Medwrite Limited | Professional & scientific | 2025 |
| Amwill Limited | Professional & scientific | 2014 |
| Analog Devices Limited | Manufacturing | 1967 |
| Anamika Properties Ltd | Real estate | 2025 |
| Anand Sons & UK Ltd | Real estate | 2021 |
| Anankai Limited | Information & communication | 2014 |
| Anant Infinity Logistic Ltd | Transport & logistics | 2026 |
| ANB Distributions Retail 1 Limited | Real estate | 2026 |
| ANB Retail Whitton Ltd | Wholesale & retail | 2026 |
| Anchorsecure Behavior Ltd | Information & communication | 2024 |
| Andel Construction Ltd | Construction | 2021 |
| Andover Close Ltd | Real estate | 2025 |
| Andre Advisory Services Limited | Professional & scientific | 2022 |
| Andro Construction Limited | Construction | 2025 |
| Anduril Solutions Limited | Financial services | 2024 |
| Angad Builder Ltd | Construction | 2021 |
| Angad Trading Ltd | Wholesale & retail | 2018 |
| Angel Childcare Limited | Education | 2020 |
| Angel Heart Ltd | Manufacturing | 2026 |
| Angel International D&D Trading Ltd | Wholesale & retail | 2018 |
| Angel Online Ltd | Wholesale & retail | 2026 |
| Angel Shuttering Ltd | Construction | 2016 |
| Angela Air FIX Ltd | Construction | 2026 |
| Angelfacilities Ltd | Administrative & support | 2025 |
| Angelic State Limited | Real estate | 2025 |
| Angels Nanny Services Ltd | Health & social care | 2024 |
| Anglo Pacific Baggage Limited | Extraterritorial | 2003 |
| Angrejit Ltd | Professional & scientific | 2026 |
| Angvo Ltd | Wholesale & retail | 2021 |
| ANH Roofing Ltd | Construction | 2026 |
| Anhad Property Limited | Real estate | 2024 |
| Animals ARE US Ltd | Professional & scientific | 2002 |
| Anjana Bhog Limited | Manufacturing | 2013 |
| Anjana Bhog Sweets Ltd | Manufacturing | 2023 |
| Anjana Samaj UK CIC | Other services | 2025 |
| Anjaniputra Limited | Wholesale & retail | 2022 |
| ANK Construction Ltd | Construction | 2023 |
| Anka PVT Ltd | Wholesale & retail | 2023 |
| Anke Property Ltd | Real estate | 2025 |
| Anmol Building Contractors Ltd | Construction | 2026 |
| Anmol Collections Ltd | Wholesale & retail | 2015 |
| Anmol Properties Holdings Ltd | Financial services | 2018 |
| Annapurna Grocery Ltd | Wholesale & retail | 2018 |
| Annet Ltd | Administrative & support | 2017 |
| Annexe Build Ltd | Transport & logistics | 2019 |
| Anoop Patel Design Ltd | Professional & scientific | 2016 |
| ANR Build Ltd | Administrative & support | 2026 |
| Anra Consultancy Ltd | Professional & scientific | 2016 |
| Ansari Cottage Limited | Real estate | 2024 |
| Ansh Chauffeurs Ltd | Transport & logistics | 2026 |
| Anshawl DE Sousa Ltd | Professional & scientific | 2025 |
| Anshconstruction Ltd | Construction | 2021 |
| Ansi (UK) Limited | Professional & scientific | 2007 |
| Anti Fragility Investment Research Limited | Financial services | 2024 |
| Antiqo Limited | Wholesale & retail | 2023 |
| Antique India Limited | Wholesale & retail | 2025 |
| Antonio Electrics Ltd | Construction | 2026 |
| ANV Property Ltd | Real estate | 2020 |
| Anwa Windows Ltd | Construction | 2015 |
| Anwarsells Ltd | Wholesale & retail | 2026 |
| Anytime Scaffolding Ltd | Construction | 2026 |
| ANZ Tiles Limited | Manufacturing | 2021 |
| AOI Notebook Ltd | Manufacturing | 2024 |
| AOM Builders Ltd | Administrative & support | 2013 |
| AP Decoration and Design Ltd | Construction | 2025 |
| AP Express Ltd | Administrative & support | 2017 |
| AP Home London Ltd | Construction | 2018 |
| AP Noor Limited | Real estate | 2023 |
| AP Singh Limited | Transport & logistics | 2025 |
| AP13 Invest Limited | Real estate | 2025 |
| Apafari Company Limited | Health & social care | 2009 |
| Apeer Bird & Pest Control Ltd | Other services | 2007 |
| Apex 13 Investments Limited | Real estate | 2024 |
| Apex Built and Maintenance Ltd | Construction | 2025 |
| Apex Consultancy & Services Limited | Professional & scientific | 2025 |
| Apex Developments London Limited | Construction | 2025 |
| Apex Estates Investments Limited | Real estate | 2026 |
| Apex Growth Collective Ltd | Professional & scientific | 2025 |
| Apex Merdian Consulting Ltd | Professional & scientific | 2026 |