| Andy Tools Limited | Other services | 2008 |
| Angel FM Trade Ltd | Wholesale & retail | 2023 |
| Angel Pharma Ltd | Wholesale & retail | 2024 |
| Angel Records Entertainment and Films Limited | Wholesale & retail | 2025 |
| Anico Logistics Group Ltd | Transport & logistics | 2025 |
| Anika Anant Property Management Ltd | Real estate | 2020 |
| Anika Limited | Real estate | 2016 |
| Anikas Services Limited | Information & communication | 2023 |
| Animikind Limited | Information & communication | 2026 |
| Animus Associates Ltd | Administrative & support | 2014 |
| Animus Associates Trustee Limited | Other services | 2023 |
| Anita Chellamah Nurse Ltd | Health & social care | 2024 |
| Anna Alexander Legal Services Ltd | Professional & scientific | 2025 |
| Anna Alexander Limited | Real estate | 2025 |
| Anna Alexander Payroll Services Ltd | Extraterritorial | 2025 |
| Anne's Future Opportunity Ltd | Manufacturing | 2021 |
| Annie Mayet Ltd | Administrative & support | 2015 |
| Annieredman Ltd | Professional & scientific | 2025 |
| Annies Ironing Parlour Ltd | Other services | 2013 |
| Anson Road (UK) Limited | Real estate | 2007 |
| Anthony Shamimi Ltd | Information & communication | 2015 |
| Anti Ageing Centre Ltd | Health & social care | 2025 |
| Antony Austin Optometrists Limited | Health & social care | 1998 |
| Antony Hizer Enterprises Limited | Administrative & support | 2024 |
| ANV Food Service Ltd | Other services | 2019 |
| Anzu Consulting Limited | Administrative & support | 2014 |
| AOA Consultancy Limited | Professional & scientific | 2025 |
| AON Groundworks Limited | Construction | 2014 |
| AP & KP Investments Ltd | Real estate | 2026 |
| AP Aesthetics Ltd | Professional & scientific | 2007 |
| AP Novare Advisory Ltd | Administrative & support | 2025 |
| Apac Solutions Ltd. | Manufacturing | 2020 |
| Apex Asset Property Limited | Professional & scientific | 2023 |
| Apex Cityscape Suites Ltd | Real estate | 2024 |
| Apex Data Solutions Limited | Administrative & support | 2022 |
| Apex Immigration Consultants Ltd | Professional & scientific | 2026 |
| Apex MG UK Limited | Information & communication | 2026 |
| Apex Sales Solutions Ltd | Professional & scientific | 2025 |
| Apex TCG Limited | Wholesale & retail | 2024 |
| APK Property Consultants Limited | Professional & scientific | 2024 |
| Appiam Ltd | Real estate | 2004 |
| Approved Design Group Ltd | Professional & scientific | 2023 |
| Approved Fire Engineering Ltd | Professional & scientific | 2024 |
| Approved Fire Safety Ltd | Professional & scientific | 2023 |
| Approved Protection Ltd | Extraterritorial | 2024 |
| APS Global Entertainment LLP | | 2025 |
| APS Global Holdings Limited | Arts & recreation | 2024 |
| Aqel Investments Limited | Real estate | 1997 |
| AQI Services Limited | Professional & scientific | 2025 |
| Aquatek Services Ltd | Construction | 2020 |
| AR Construct Limited | Construction | 2018 |
| AR Developments London Ltd | Real estate | 2021 |
| Arabian Essence Limited | Other services | 2018 |
| Arba Holdings Ltd | Financial services | 2019 |
| ARC Accounting UK Ltd | Professional & scientific | 2024 |
| ARC Construction Services Ltd | Construction | 2023 |
| ARC Construction Specialists Ltd | Construction | 2026 |
| ARC Waterproofing Limited | Construction | 2009 |
| Arch Media & Design Limited | Professional & scientific | 2016 |
| Arch Technologies and Consulting Ltd | Information & communication | 2024 |
| Architect AI Ltd | Real estate | 2022 |
| Arco Maher Limited | Wholesale & retail | 2019 |
| Arctic Cooling Limited | Manufacturing | 2003 |
| Arda Padel Ltd | Wholesale & retail | 2025 |
| Ardian Property Limited | Real estate | 2018 |
| Ardus Properties Ltd | Real estate | 2024 |
| Arena Design and Build Ltd | Professional & scientific | 2016 |
| Arez Lettings Ltd | Real estate | 2021 |
| Arez Rail Ltd | Construction | 2016 |
| Ariea Holdings Limited | Real estate | 2024 |
| Ariea Property Ltd | Real estate | 2018 |
| Arit Express Ltd | Wholesale & retail | 2014 |
| Arivan & SON Ltd | Construction | 2018 |
| Arjan P Limited | Professional & scientific | 2023 |
| Arje Services Ltd | Administrative & support | 2018 |
| Arlo Consulting Ltd | Administrative & support | 2021 |
| Army Navy Manor Park Ltd | Wholesale & retail | 2024 |
| Arre Limited | Professional & scientific | 2018 |
| Arriana Property Group Limited | Real estate | 2024 |
| Arrow Tools Limited | Manufacturing | 1992 |
| Art of Trim Limited | Wholesale & retail | 2025 |
| Art Practice Limited | Information & communication | 2020 |
| Art Theory Limited | Professional & scientific | 2020 |
| Arteta Properties Limited | Administrative & support | 2025 |
| Artfactory Limited | Wholesale & retail | 2012 |
| Arthur Alexander Properties Limited | Construction | 2020 |
| Arthur Phillip Properties Limited | Real estate | 2018 |
| Artifice Press Limited | Information & communication | 2018 |
| Artiligenz Ltd | Information & communication | 2025 |
| Artisan Pizza Ltd | Hospitality | 2019 |
| Artist Cars Limited | Transport & logistics | 2012 |
| Arwin Cleaning Services Limited | Administrative & support | 2021 |
| Arya Digital Limited | Information & communication | 2016 |
| Aryan Property Investment Limited | Real estate | 2003 |
| Aryan Westwood Ltd | Real estate | 2023 |
| AS Garments Ltd | Wholesale & retail | 2017 |
| AS Home Solutions Limited | Construction | 2018 |
| AS Marylebone Limited | Hospitality | 2011 |
| Asbpro Limited | Construction | 2013 |
| Ascend Investments Limited | Real estate | 2016 |