| Autobahn London Limited | Wholesale & retail | 2003 |
| Automatefifth Ltd | Real estate | 2022 |
| Autopath Recruitment Ltd | Administrative & support | 2024 |
| Autumn Grove Management Limited | Extraterritorial | 2005 |
| Autumn Lords Associates Limited | Arts & recreation | 2007 |
| AV Media Management Ltd | Information & communication | 2007 |
| AV Smart Solution Ltd | Construction | 2023 |
| AVA Consulting Services Ltd | Professional & scientific | 2018 |
| AVA Engineering Limited | Construction | 2024 |
| Avalon Lettings Limited | Real estate | 2021 |
| Avanguardia Solutions Limited | Information & communication | 2024 |
| Avant-Garde (UK) Security Limited | Administrative & support | 2018 |
| Avante House Limited | Construction | 2015 |
| Avautoparts Ltd | Wholesale & retail | 2018 |
| AVB Solutions Ltd | Construction | 2023 |
| AVE @ Home Limited | Health & social care | 2019 |
| Aventus Network Services Limited | Information & communication | 2020 |
| Averil Grove Estate Limited(The) | Households | 1964 |
| Avery Close (Beckenham) Management Company Limited | Households | 2017 |
| Avia Consultancy Ltd | Professional & scientific | 2020 |
| Aviate Travel Ltd | Administrative & support | 2023 |
| Avicraft Limited | Manufacturing | 1963 |
| Avighna FNX Ltd | Other services | 2020 |
| Aviomain Limited | Manufacturing | 2017 |
| Avis Hotel Limited | Hospitality | 2002 |
| AVO Cleaning Ltd | Administrative & support | 2026 |
| Avonsys Limited | Information & communication | 2016 |
| Avoya Fitness Ltd | Arts & recreation | 2020 |
| Avvt Limited | Administrative & support | 2023 |
| Avvy Barter Consultancy Ltd | Professional & scientific | 2020 |
| Avvy Barter Properties Ltd | Real estate | 2023 |
| AVW Cleaning Ltd | Administrative & support | 2026 |
| AW Accountancy & Bookkeeping Ltd | Professional & scientific | 2016 |
| AW PVT Ltd | Wholesale & retail | 2023 |
| Awakened Adventures Ltd | Professional & scientific | 2026 |
| Awfc Trustee Limited | Other services | 2024 |
| Awra Invest Ltd | Real estate | 2026 |
| Axel Alliance C Service Limited | Construction | 2026 |
| Axenbury Homes Ltd | Real estate | 2026 |
| AXI Services Ltd | Transport & logistics | 2025 |
| Axis D.H Ltd | Construction | 2021 |
| AY Property Rentals Limited | Real estate | 2025 |
| Ayaan Abdul Limited | Real estate | 2021 |
| Ayaos Ltd | Other services | 2015 |
| Ayaz Salon Limited | Other services | 2025 |
| Ayioci Ltd | Transport & logistics | 2022 |
| Aykomar Ltd | Construction | 2020 |
| Ayling & Associates Limited | Health & social care | 2022 |
| Ayza Techno Soft Ltd | Administrative & support | 2020 |
| AZ Electromechanics Limited | Construction | 2016 |
| AZ29 Limited | Other services | 2009 |
| Azadi Limited | Health & social care | 2006 |
| Azalm Ltd | Professional & scientific | 2012 |
| Azari Care Services Limited | Health & social care | 2014 |
| AZE Systems Ltd | Information & communication | 2026 |
| AZI Business Solutions Ltd | Information & communication | 2015 |
| Azitif Property Group Limited | Hospitality | 2025 |
| Azott Ltd | Construction | 2023 |
| Azra Enterprises Limited | Hospitality | 2021 |
| Aztec M & E Services Limited | Construction | 2019 |
| Azuka Skin Ltd | Wholesale & retail | 2022 |
| AZY Property Management Ltd | Real estate | 2021 |
| AZY Property SPV Ltd | Real estate | 2025 |
| AZY Trading Ltd | Real estate | 2024 |
| AZY Venture Holding Ltd | Financial services | 2025 |
| AZY Venture Ltd | Real estate | 2020 |
| B & B Building Services Ltd | Construction | 2022 |
| B & J Holdings Ltd | Financial services | 2019 |
| B & M Decorators (UK) Limited | Construction | 2014 |
| B & P Productions Ltd | Administrative & support | 2024 |
| B Brief Ltd | Professional & scientific | 2025 |
| B Capital Limited | Financial services | 2024 |
| B K Ventures Ltd | Construction | 2012 |
| B M H Results Ltd. | Information & communication | 2013 |
| B S Ductwork Services Limited | Construction | 2014 |
| B Steel Limited | Wholesale & retail | 2009 |
| B T I (Contractors) Limited | | 1985 |
| B Tamplin & Co Limited | Construction | 2009 |
| B YOU by Rosie Limited | Wholesale & retail | 2025 |
| B&A Convenience Stores Ltd | Wholesale & retail | 2026 |
| B&B Beauty Co. Ltd | Other services | 2023 |
| B&D Carpentry Limited | Construction | 2017 |
| B&S Savory Ltd | Hospitality | 2023 |
| B-Spoke Production Limited | Manufacturing | 2003 |
| B. Wolfenden Surveying Limited | Professional & scientific | 2003 |
| B.A.R.K Consultancy Limited | Other services | 2024 |
| B.A.R.K Tuitions Limited | Education | 2024 |
| B.L.S. Futures Limited | Financial services | 1993 |
| B.W. (Electrical Contractors) Limited | Administrative & support | 2007 |
| B17 Business Solutions Ltd | Administrative & support | 2025 |
| Baalcare Ltd | Health & social care | 2022 |
| Baba & Mountains and Water Limited | Real estate | 2025 |
| Babi Cabs Limited | Transport & logistics | 2012 |
| Babington Court Freehold Limited | Households | 2012 |
| Babo Group Limited | Professional & scientific | 2021 |
| Babu's Property Ltd | Real estate | 2025 |
| Baby and Child Ltd | Wholesale & retail | 2012 |
| Backflip Creations Ltd | Arts & recreation | 2024 |
| Baddiley & Cooper Limited | Hospitality | 1967 |
| Badumi Limited | Agriculture & fishing | 2025 |