| Aloysius Properties Limited | Real estate | 2024 |
| Alpha Chemitech Co., Ltd | Professional & scientific | 2010 |
| Alpha Industrial Manufacture Limited | Manufacturing | 2025 |
| Alpha Quantum Co., Limited | Wholesale & retail | 2025 |
| Alpha Technology Industrial Co., Ltd | Manufacturing | 2023 |
| Alpha Training Consultancy Limited | Information & communication | 2016 |
| Alphax Seven Investment Limited | Wholesale & retail | 2024 |
| Alpine Culture Limited | Administrative & support | 2014 |
| Alpine Escape SKI Ltd | Administrative & support | 2014 |
| Alright B T L Limited | Real estate | 2017 |
| Alris Ltd | Transport & logistics | 2019 |
| Alrosa Investment Group Co., Ltd | Extraterritorial | 2021 |
| ALS Estates Ltd | Real estate | 2024 |
| Alsancak Lettings Ltd | Households | 2026 |
| Altec Machinery Enterprise Limited | Manufacturing | 2022 |
| Alto Global Partners Ltd | Financial services | 2026 |
| Aluke Machine Tool Co., Ltd | Extraterritorial | 2009 |
| Always Industrial and Commercial Co. Limited | Wholesale & retail | 2019 |
| Alwisam Import and Export Trading Co., Ltd | Extraterritorial | 2023 |
| AM & J Properties LLP | | 2024 |
| AM Griffiths Music Ltd | Arts & recreation | 2015 |
| Amadeus Investment Group Ltd | Construction | 2020 |
| Amalfi Beckenham Delivery Ltd | Hospitality | 2024 |
| Amanda Horton Design Limited | Professional & scientific | 2014 |
| Amanda International Co., Limited | Extraterritorial | 2024 |
| Amanda Parker Associates CIC | Administrative & support | 2024 |
| Amanha Global Co., Ltd | Manufacturing | 2024 |
| Amarah Personal Care Limited | Wholesale & retail | 2023 |
| Amari Food Ltd | Hospitality | 2019 |
| Amazefort Ltd | Health & social care | 2017 |
| Amazon Chemicals (UK) Ltd | Extraterritorial | 2014 |
| Ambassador International Reporting Limited | Other services | 2004 |
| Amber & Green Studio Limited | Professional & scientific | 2010 |
| Amber Accessories Co., Ltd | Wholesale & retail | 2020 |
| Amber Fort (Beckenham) Ltd | Hospitality | 2017 |
| Amber Manufacture Co., Ltd | Wholesale & retail | 2019 |
| Ambition Ceramics Co., Ltd | Extraterritorial | 2020 |
| AMC Resources Limited | Professional & scientific | 2018 |
| Ameida CNC Technology Co., Ltd | Extraterritorial | 2017 |
| Ameisizhuang Company Ltd | Wholesale & retail | 2019 |
| Amelia’S Academics Limited | Education | 2025 |
| Amercian Quant Investment Ltd | Financial services | 2022 |
| Amerisolar Energy UK and EU Ltd | Manufacturing | 2024 |
| Amerisweet Co., Limited | Manufacturing | 2024 |
| Amerson Chemicals Co., Limited | Extraterritorial | 2006 |
| AMG Accounting Limited | Professional & scientific | 2009 |
| Amia Seafoods Ltd | Extraterritorial | 2015 |
| Amico International Trading Limited | Wholesale & retail | 2020 |
| Amini Brothers Trading Co., Ltd | Extraterritorial | 2023 |
| Amison Marine Co., Ltd | Manufacturing | 2024 |
| Amity Industry Limited | Wholesale & retail | 2020 |
| AMK 4 Ltd | Real estate | 2017 |
| Amochy Group Ltd. | Manufacturing | 2020 |
| Amos Food (UK) Ltd. | Manufacturing | 2024 |
| Amper Fashion International Limited | Extraterritorial | 2008 |
| Ampt Consultancy Ltd | Professional & scientific | 2026 |
| Amryis Limited | Manufacturing | 2023 |
| Ams-Aurora Marine Service Co., Ltd | Manufacturing | 2022 |
| AMT Biotech Ltd | Manufacturing | 2019 |
| Amtast Co., Ltd | Extraterritorial | 2019 |
| Amtofo Ltd | Wholesale & retail | 2021 |
| Amtre Veritas Standard Technical Testing Ltd | Extraterritorial | 2018 |
| Amzdekor Products Co., Limited | Wholesale & retail | 2024 |
| Ananda Bridal Ltd | Wholesale & retail | 2023 |
| Anardy Import&Export Ltd | Wholesale & retail | 2020 |
| Anatole Design Limited | Professional & scientific | 2012 |
| Anchorstone Machinery Trading Limited | Professional & scientific | 2024 |
| Ancient River Electric Company Limited | Manufacturing | 2023 |
| Anda International Limited | Extraterritorial | 2024 |
| Andavmc Limited | Agriculture & fishing | 2025 |
| Andeliver Biotech Limited | Manufacturing | 2025 |
| Anderson Hardy Kitchens Limited | Construction | 2016 |
| Anderson Hardy Limited | Real estate | 2021 |
| Anderson Wright Technology Co., Ltd | Extraterritorial | 2020 |
| Anderson+ Limited | Professional & scientific | 2023 |
| Andfriends Limited | Administrative & support | 2011 |
| Andrea Construction Ltd | Construction | 2024 |
| Andreas Cleaning Services Limited | Wholesale & retail | 2017 |
| Andrew Brenson Consulting Ltd | Information & communication | 2012 |
| Andrew Copeland (Insurance Consultants) Limited | Financial services | 1977 |
| Andrew Copeland International Limited | Financial services | 1987 |
| Andrew Copeland Properties Limited | Real estate | 1998 |
| Andrew Kingsley Limited | Real estate | 1996 |
| Andsing (UK) Limited | Manufacturing | 2022 |
| Andsome Ltd | Professional & scientific | 2016 |
| Angchun Industrial Limited | Extraterritorial | 2013 |
| Angeles Chem Group Co., Ltd. | Extraterritorial | 2016 |
| Angels Group of Companies Ltd | Professional & scientific | 2007 |
| Anglesea Assets Limited | Real estate | 2022 |
| ANH Enterprise International Ltd | Wholesale & retail | 2023 |
| Anhui Bring Import and Export Trading Co., Ltd | Extraterritorial | 2018 |
| Anhui Natural Home Textile Corp. Ltd. | Extraterritorial | 2019 |
| Anja Murphy Ltd | Health & social care | 2021 |
| Anji Hong Young Technology Co., Ltd | Extraterritorial | 2022 |
| Anji Jiexing Home Supplies Co., Ltd. | Extraterritorial | 2019 |
| Anji Junbang Furniture Co., Ltd | Extraterritorial | 2022 |
| Anji Yuandong Pigment Co., Ltd. | Extraterritorial | 2014 |
| Anliny Limited | Wholesale & retail | 2023 |
| Anmek Group Ltd. | Extraterritorial | 2022 |
| Annabella Novi Ltd | Manufacturing | 2023 |