| AY Bargain (Online) Ltd | Wholesale & retail | 2022 |
| AY Group Tyres Ltd | Wholesale & retail | 2024 |
| AY Productions Ltd | Professional & scientific | 2023 |
| AYA Industries Limited | Construction | 2022 |
| Ayaan Autos Derby Ltd | Wholesale & retail | 2025 |
| Ayaan Japan Ltd | Wholesale & retail | 2023 |
| Ayaan Trading Ltd | Real estate | 2024 |
| Ayahs Kitchen Limited | Hospitality | 2023 |
| Ayahs Nest Limited | Wholesale & retail | 2025 |
| Aydin-It Limited | Information & communication | 2022 |
| Ayem Ltd | Health & social care | 2009 |
| Ayla Coffee Shop Limited | Hospitality | 2026 |
| Aylaahmadzai Limited | Wholesale & retail | 2022 |
| Aymy Investments 1 Ltd | Professional & scientific | 2024 |
| Aynguard Technologies Ltd | Information & communication | 2025 |
| Ayobami Olorunniyi Limited | Manufacturing | 2025 |
| Ayresome Consulting Limited | Information & communication | 2013 |
| Ayubs Estates Limited | Real estate | 2020 |
| Ayup Community Ltd | Wholesale & retail | 2024 |
| Ayyan International Ltd | Transport & logistics | 2020 |
| AZ Cars and Rentals Derby Ltd | Administrative & support | 2025 |
| AZ Dental Care Limited | Health & social care | 2026 |
| AZ Power Services Limited | Construction | 2026 |
| AZ Same Day Derby Ltd | Transport & logistics | 2025 |
| AZ Team Properties Ltd | Real estate | 2025 |
| Azaira Ltd | Wholesale & retail | 2025 |
| Azarha Ltd | Real estate | 2024 |
| Azariel Holdings Ltd | Financial services | 2026 |
| Azeem Cars Ltd | Transport & logistics | 2024 |
| Azeem Healthcare Services Ltd | Health & social care | 2012 |
| Azgt Limited | Wholesale & retail | 2023 |
| AZH Associates Ltd | Construction | 2011 |
| Azimuth Images Limited | Education | 2016 |
| Aziz Joinery Ltd | Administrative & support | 2016 |
| Aziz Property Lettings Limited | Real estate | 2025 |
| Aziz Real Estate Limited | Real estate | 2023 |
| Azjax Living Ltd | Real estate | 2026 |
| Azlaan Ltd | Transport & logistics | 2023 |
| Azmar Resturant Limited | Hospitality | 2026 |
| AZP Real Estate Ltd | Real estate | 2025 |
| AZR Holding Group Ltd | Wholesale & retail | 2017 |
| AZUL101 Limited | Professional & scientific | 2025 |
| AZUL102 Limited | Professional & scientific | 2025 |
| AZUL103 Limited | Professional & scientific | 2025 |
| Azure (Eco) Ltd | Agriculture & fishing | 2026 |
| Azure Carbis Bay Residents Co. Ltd | Households | 2021 |
| Azure Choice Limited | Hospitality | 2025 |
| Azure Leaf Limited | Construction | 2020 |
| Azure Octadent Limited | Health & social care | 2024 |
| Azzuri Ltd | Professional & scientific | 2024 |
| Azzurro Enterprises Limited | Hospitality | 2003 |
| B & a Herts Brickwork Limited | Construction | 2019 |
| B & B Trading (UK) Limited | Real estate | 1997 |
| B & G Construction & Build Ltd | Construction | 2022 |
| B & H Logistics Ltd | Transport & logistics | 2020 |
| B & K Grabs Limited | Construction | 2017 |
| B & M Pipelines Ltd | Construction | 2018 |
| B & M Property Developments Limited | Real estate | 2005 |
| B & S Property Maintenance Ltd | Construction | 2026 |
| B & T Parsons Limited | Health & social care | 2016 |
| B and I Kitchen Installations Ltd | Manufacturing | 2022 |
| B B Absolute LLP | | 2017 |
| B Best News Limited | Other services | 2015 |
| B C W Hand Car Wash Ltd | Administrative & support | 2024 |
| B Clark Services Ltd | Transport & logistics | 2019 |
| B D I Property Services Limited | Extraterritorial | 1999 |
| B Donaldson Solutions Limited | Professional & scientific | 2012 |
| B Goodsell-King Limited | Financial services | 2012 |
| B J G Services (Derby) Limited | Manufacturing | 2003 |
| B K K DE Silva Ltd | Health & social care | 2018 |
| B K Shalmani Properties Limited | Real estate | 2026 |
| B Kaur Retail Ltd | Wholesale & retail | 2019 |
| B L Notts Holdings Ltd | Financial services | 2025 |
| B Lever Consulting Ltd | Professional & scientific | 2024 |
| B Lunn Environmental & Sustainability Solutions Limited | Professional & scientific | 2025 |
| B M Kelly and Associates Ltd | Professional & scientific | 2010 |
| B Plus H Johal Limited | Real estate | 2012 |
| B R C Training Limited | Education | 2014 |
| B Shaw Ltd | Professional & scientific | 2020 |
| B Spotless Solutions Ltd | Transport & logistics | 2025 |
| B the Builders Ltd | Construction | 2019 |
| B Umais Ltd | Wholesale & retail | 2025 |
| B W Builders Limited | Construction | 2013 |
| B Well Life Limited | Wholesale & retail | 2023 |
| B&B Brothers Cleaning Service Limited | Administrative & support | 2024 |
| B&J Contracting Ltd | Other services | 2026 |
| B&M Trans Ltd | Wholesale & retail | 2016 |
| B&Psons Ltd | Real estate | 2022 |
| B&S Window Services Limited | Construction | 2005 |
| B&T Engineering (Midlands) Limited | Manufacturing | 2020 |
| B&U07 Ltd | Wholesale & retail | 2025 |
| B. E. Webbe Removals (Derby) Limited | Transport & logistics | 1976 |
| B.A.B. Motors Limited | Wholesale & retail | 1969 |
| B.C.B. International Limited | Manufacturing | 1979 |
| B.D.N. Construction Limited | Construction | 2001 |
| B.Hattersley & Sons,Limited | Other services | 1946 |
| B.J. Bloor (Quality Builder) Limited | Construction | 1997 |
| B.J. Wilson Limited | Wholesale & retail | 1979 |
| B.J.G. (Derby) Limited | Wholesale & retail | 1967 |
| B.Lloyd Holdings Ltd | Financial services | 2023 |