| Avabit Ltd | Information & communication | 2017 |
| Avant Technologies Ltd | Administrative & support | 2024 |
| Avant-Garde Healthcare Ltd | Health & social care | 2019 |
| Avantec Limited | Construction | 1964 |
| Avara Limited | Hospitality | 2022 |
| Avasha Homes Limited | Construction | 2019 |
| Avasha Investments Group (N0.2) Limited | Real estate | 2015 |
| Avasha Investments Group (NO.1) Limited | Administrative & support | 2015 |
| Avasha Investments Group (NO.3) Limited | Real estate | 2016 |
| Avenue & Co Developments Limited | Real estate | 2016 |
| Avenue Accommodation Ltd | Real estate | 2025 |
| Avery Holdings Limited | Real estate | 1929 |
| Avery Spaces Ltd | Real estate | 2025 |
| Avesta Pharma Limited | Wholesale & retail | 2018 |
| Aviation Structures Ltd | Transport & logistics | 2021 |
| Aviso Marine Limited | Professional & scientific | 2013 |
| AVL Cloud Technologies Ltd | Information & communication | 2018 |
| AVL Health Limited | Other services | 2023 |
| Avoca Eaton Road Limited | Households | 2017 |
| Avolon GRP Limited | Administrative & support | 2010 |
| Avolon Mechanical & Electrical (Recruitment) Ltd | Administrative & support | 2018 |
| Avon House (Balcombe) Limited | Health & social care | 2005 |
| AW Confectionery Holdings Ltd | Manufacturing | 2023 |
| AW Confectionery Opco Ltd | Manufacturing | 2024 |
| Awake Consulting Limited | Professional & scientific | 2021 |
| AWE Extensions Ltd | Other services | 2018 |
| AWE Import & Export Ltd | Wholesale & retail | 2025 |
| Awesome Media & Entertainment Ltd | Administrative & support | 2010 |
| Axbo Limited | Wholesale & retail | 2011 |
| Axel Security Ltd | Administrative & support | 2019 |
| Axis (Holding Group) Ltd | Financial services | 2025 |
| Axis Development Solutions Ltd | Real estate | 2021 |
| Axis House Eastbourne Limited | Real estate | 2022 |
| Axis Lettings Ltd | Real estate | 2022 |
| Axtra Limited | Transport & logistics | 1995 |
| Axtra Sales and Workshop Ltd | Wholesale & retail | 2003 |
| AY to ZAY Limited | Real estate | 2021 |
| AYA Duka Ltd | Wholesale & retail | 2023 |
| Aymer House Freehold Ltd | Real estate | 2021 |
| AYR Ventures Limited | Construction | 2022 |
| Ayuu Wellness Ltd | Wholesale & retail | 2026 |
| Ayvake 77 Ltd | Real estate | 2021 |
| Aziza App Limited | Information & communication | 2024 |
| Aznav Ltd | Other services | 2018 |
| Azurerise Limited | Financial services | 1996 |
| Azuron Maritime Limited | Professional & scientific | 2025 |
| B and S Waste Removals Limited | Water & waste | 2025 |
| B Arthur Plumbing and Heating Services Limited | Construction | 2016 |
| B R Baxter Ltd | Construction | 2020 |
| B&H Escapes Ltd | Administrative & support | 2025 |
| B&H2 Ltd | Real estate | 2017 |
| B&Hp SUB Co Limited | Real estate | 2023 |
| B&K Consulting Services Ltd | Information & communication | 2020 |
| B.H. Christian Workers' Trust | Real estate | 2011 |
| B.M Fruit Ltd | Wholesale & retail | 2024 |
| B/M Salib Property Ltd | Real estate | 2020 |
| B4G Ltd | Wholesale & retail | 2020 |
| BA Asset Management Ltd | Financial services | 2020 |
| Babbayan Investment Holdings Limited | Real estate | 2020 |
| Babbayan Investments Limited | Real estate | 2015 |
| Babblestock Ltd | Professional & scientific | 2022 |
| Babilon Homes Limited | Real estate | 2024 |
| BAC Drywall Limited | Construction | 2022 |
| Back Chat Media Limited | Information & communication | 2010 |
| Back Coach Limited | Information & communication | 2026 |
| Back to Balance Holdings Limited | Professional & scientific | 2009 |
| Back to Balance With Chiropractic Ltd | Health & social care | 2002 |
| Back to Wine Ltd | Wholesale & retail | 2016 |
| Backlash Press CIC | Information & communication | 2025 |
| Bacon Builders Limited | Construction | 2013 |
| Badcock Building Services Design Ltd | Professional & scientific | 2014 |
| Badger & Bolt Limited | Information & communication | 2018 |
| BAF Health Limited | Health & social care | 2025 |
| Baga 3 Ltd | Real estate | 2023 |
| Bagoosh Limited | Wholesale & retail | 2022 |
| Bahig Property Investment Ltd | Real estate | 2019 |
| Baigs Property Residential Services Ltd | Real estate | 2006 |
| Bailey Brothers Limited | Construction | 2003 |
| Bailey Solutions Ltd | Information & communication | 2002 |
| Bain Solutions UK Limited | Extraterritorial | 2023 |
| Bajan Sauces Ltd | Hospitality | 2019 |
| BAK Brighton Limited | Construction | 2023 |
| Bake OUT Hassocks Ltd | Wholesale & retail | 2018 |
| Bake OUT Lewes Ltd | Wholesale & retail | 2018 |
| Bake OUT Southwick Ltd | Wholesale & retail | 2018 |
| Balcary Trading Group Ltd | Information & communication | 2020 |
| Balcombe Solar Limited | Energy | 2015 |
| Bali Brasserie Limited | Hospitality | 2025 |
| Balivillashvr Limited | Hospitality | 2025 |
| Baljit Singh Tiwana Ltd | Extraterritorial | 2022 |
| Balk Investments Limited | Financial services | 2021 |
| Ballantyne Edwards Limited | Wholesale & retail | 1979 |
| Ballard Holdings Ltd | Professional & scientific | 2011 |
| Ballards Mill Construction Ltd | Construction | 2012 |
| Baltic Companies Investment Ltd | Real estate | 2024 |
| Baltimore Court Freehold Ltd | Households | 2025 |
| Baltimore Court RTM Company Limited | Extraterritorial | 2023 |
| Bamboobear Cards Limited | Information & communication | 2011 |
| Bancroft Estates Limited | Households | 1995 |
| Bandah Limited | Real estate | 2021 |