| Aycon Construction Ltd | Construction | 2008 |
| Ayeshas Jewellery Box Ltd | Wholesale & retail | 2023 |
| Ayetis Solutions Limited | Health & social care | 2022 |
| AYH Capital Ltd | Real estate | 2025 |
| Ayla & the Loom Limited | Wholesale & retail | 2026 |
| Ayla Tabassum Choudhary Limited | Health & social care | 2020 |
| Aylesford Management Company Limited | Households | 2003 |
| Ayma Fashion Ltd | Wholesale & retail | 2024 |
| Aymj Limited | Wholesale & retail | 2025 |
| Aynam Court Management Company Limited | Households | 1990 |
| Aynesley & Co Limited | Professional & scientific | 2019 |
| Aynesley Walters Cohen Limited | Professional & scientific | 2000 |
| Ayngaran Energy Limited | Wholesale & retail | 2025 |
| Ayone Financial Ltd | Financial services | 2025 |
| Ayra Healthcare Private Limited | Health & social care | 2025 |
| Ayse Tezgel Ltd | Administrative & support | 2025 |
| AYT Property Management Limited | Real estate | 2025 |
| Ayton House Pictures Ltd | Information & communication | 2019 |
| Ayurata Limited | Health & social care | 2015 |
| Ayuta Healthcare Limited | Information & communication | 2025 |
| AYW Aspiring Young Women/ Warriors CIC | Education | 2022 |
| AYW London Ltd | Education | 2022 |
| Ayya Food & Wine Ltd | Wholesale & retail | 2026 |
| Ayyer Associates Ltd | Health & social care | 2018 |
| AZ Beauty & Hair Ltd | Other services | 2023 |
| AZ Contractors Ltd | Other services | 2019 |
| AZ Fast Food Ltd | Hospitality | 2024 |
| AZ Godelivery Ltd | Transport & logistics | 2019 |
| Azal Foods Limited | Extraterritorial | 2021 |
| AZB Property Ltd | Real estate | 2025 |
| Azhar Medical Services Limited | Health & social care | 2016 |
| Aziz Interior Designs Ltd | Construction | 2019 |
| Azizi Investments Limited | Real estate | 2015 |
| Azka Kebab Ltd | Hospitality | 2025 |
| AZN Solutions Ltd | Wholesale & retail | 2021 |
| Azra Jewellery Ltd | Wholesale & retail | 2022 |
| AZS Property Holdings Ltd | Real estate | 2022 |
| AZT Electrical Services Ltd | Construction | 2018 |
| Aztec Records Ltd | Information & communication | 2010 |
| Aztrac Ltd | Households | 2006 |
| Azure Finance Consultancy Ltd | Administrative & support | 2014 |
| Azure Hospitality UK Limited | Hospitality | 2017 |
| Azuronn Ltd | Wholesale & retail | 2023 |
| Azzzi Properties Limited | Real estate | 2025 |
| B & C London Limited | Other services | 2011 |
| B & L Portugal Limited | Hospitality | 2025 |
| B & R Building Service Ltd | Construction | 2019 |
| B Dinu Carpentry Ltd | Construction | 2013 |
| B E Thompson GAS Services Limited | Construction | 2015 |
| B H a Locum Services Limited | Wholesale & retail | 2013 |
| B Joy Transport Limited | Transport & logistics | 2010 |
| B L W Maintenance Ltd | Construction | 2017 |
| B M S Fast Food Ltd | Hospitality | 2024 |
| B Profiled Ltd | Manufacturing | 2025 |
| B R Siggins (Ashford) Ltd | Real estate | 2017 |
| B&A Housing Limited | Real estate | 2023 |
| B&A Investment Holdings Limited | Financial services | 2022 |
| B&A Property Group Limited | Real estate | 2021 |
| B&C Properties Development Ltd | Real estate | 2023 |
| B&D (UK) Limited | Real estate | 2003 |
| B&H Partners Limited | Hospitality | 2025 |
| B&L Alturas Limited | Hospitality | 2025 |
| B&P UNI Advisors Ltd | Administrative & support | 2024 |
| B-Hive Company Secretarial Services Limited | Real estate | 2009 |
| B-T Thompson Law Ltd | Professional & scientific | 2025 |
| B.Fairall (UK) Limited | Wholesale & retail | 2005 |
| B.J. Hall (Builders) Limited | Wholesale & retail | 1977 |
| B.N.L.G. Associates Limited | Administrative & support | 2003 |
| B.P. Pharma Limited | Wholesale & retail | 1993 |
| B.T.S. Skips Limited | Construction | 1993 |
| B.Thecause Ltd | Professional & scientific | 2019 |
| B.Y. Innovations Ltd | Other services | 2007 |
| B20 Property Ltd | Real estate | 2024 |
| B2B Heating Ltd | Construction | 2017 |
| B2B Sales & Marketing Ltd | Professional & scientific | 2016 |
| B2TWIN Ltd | Manufacturing | 2025 |
| B8 Construction Limited | Construction | 2021 |
| B85 Limited | Construction | 2022 |
| BA Direct Enterprise Ltd | Hospitality | 2023 |
| BA Transport Ltd | Wholesale & retail | 2019 |
| Ba-Ho-Yi Limited | Real estate | 2002 |
| Baachu Limited | Information & communication | 2018 |
| Baachu Works Limited | Professional & scientific | 2014 |
| Baawaji Construction Ltd | Construction | 2022 |
| Baba G Food Store Limited | Wholesale & retail | 2025 |
| Baba Services Limited | Health & social care | 2018 |
| Babdown Farm (Tetbury) Management Company Number One Limited | Households | 2015 |
| Babdown Farm (Tetbury) Management Company Number Two Limited | Households | 2015 |
| Baboon Productions Limited | Information & communication | 2025 |
| Babsgrill (the Flames) Limited | Hospitality | 2023 |
| Baby Art Wolverhampton Limited | Real estate | 2020 |
| Baby Care Services Limited | Health & social care | 2025 |
| Baby Pheasant Ltd | Wholesale & retail | 2022 |
| Baby Worlddirect.Com Limited | Manufacturing | 2000 |
| Bachra Stores Limited | Wholesale & retail | 2013 |
| Back Home Brand Limited | Wholesale & retail | 2011 |
| Bacteria Busters Ltd | Administrative & support | 2020 |
| BAD Behaviour Ltd | Information & communication | 2024 |
| Badig Kiday Limited | Extraterritorial | 2008 |
| Badious Ltd | Professional & scientific | 2019 |