| Avio Services Ltd | Professional & scientific | 2025 |
| Avis Real Estate Ltd | Real estate | 2022 |
| Avlabari Group Ltd | Professional & scientific | 2020 |
| Avocado Natural Organic Limited | Other services | 2024 |
| Avonline Transport Limited | Transport & logistics | 2003 |
| Avonmouth Properties Ltd | Real estate | 2025 |
| AVT Systems (UK) Limited | Information & communication | 2008 |
| AW Homing Limited | Real estate | 2025 |
| Aw-Ac Ltd | Construction | 2022 |
| AWA Organics UK Ltd | Wholesale & retail | 2026 |
| Awaisgroup Ltd | Manufacturing | 2025 |
| Awaze Qaum TV Limited | Information & communication | 2017 |
| Aweco Ltd | Professional & scientific | 2021 |
| Awes Fleet Ltd | Transport & logistics | 2024 |
| Awesome Car Sales Ltd | Wholesale & retail | 2019 |
| Awesome Move Ltd | Real estate | 2016 |
| Awesome Stickers Limited | Manufacturing | 2024 |
| Awmi Investments Limited | Real estate | 2021 |
| Awrash Ltd | Wholesale & retail | 2024 |
| AX Recruiter Ltd | Administrative & support | 2024 |
| Axel Bear Party Supplies Ltd | Wholesale & retail | 2023 |
| Axel Construction Training Ltd | Education | 2026 |
| Axia Supported Housing Ltd | Health & social care | 2025 |
| Axion Wholesale Ltd | Wholesale & retail | 2021 |
| Axis Academics Limited | Information & communication | 2026 |
| Axis Interiors Ltd | Manufacturing | 2026 |
| AYA London Ltd | Wholesale & retail | 2024 |
| Aydee Ltd | Wholesale & retail | 2018 |
| Ayian Ltd | Construction | 2024 |
| Aynz Finance Ltd | Administrative & support | 2022 |
| Ayoartistry Ltd | Information & communication | 2025 |
| Ayomich Limited | Wholesale & retail | 2025 |
| Ayopey Global Solutions Limited | Information & communication | 2021 |
| AYS Commercial Holdings Limited | Real estate | 2020 |
| Ayub Williams Ltd | Professional & scientific | 2026 |
| Ayuti Holdings Ltd | Financial services | 2021 |
| Ayymin Solutions Ltd | Transport & logistics | 2019 |
| Azaan Global UK Ltd | Hospitality | 2025 |
| Azahya Foods Limited | Hospitality | 2025 |
| Azco Investments Ltd | Real estate | 2022 |
| Azeem Hussain Ltd | Wholesale & retail | 2021 |
| Aztec Holdco Ltd | Financial services | 2024 |
| Aztec Mouldings Limited | Manufacturing | 2018 |
| Aztec Tooling & Moulding Co. Limited | Manufacturing | 1982 |
| Azurite Health Care Limited | Health & social care | 2020 |
| Azurtane Limited | Professional & scientific | 2009 |
| Azza's Roofing Services Ltd | Construction | 2024 |
| Azzabob Ltd | Real estate | 2021 |
| Azzurri Leisure Limited | Wholesale & retail | 2023 |
| B & D Spices Limited | Hospitality | 2025 |
| B & J Distribution Holdings Limited | Wholesale & retail | 2022 |
| B & J Distribution Limited | Wholesale & retail | 1997 |
| B & S Steelworks Ltd | Manufacturing | 2013 |
| B & U Food Company Limited | Hospitality | 2012 |
| B & W Property Services Limited | Construction | 2012 |
| B & W Scaffolding Services Limited | Construction | 2016 |
| B & W Services Midlands Limited | Construction | 2020 |
| B a Cranes Limited | Professional & scientific | 2008 |
| B a Perkins Scrap Metals Ltd | Wholesale & retail | 2015 |
| B and G Ventures Ltd | Wholesale & retail | 2025 |
| B B Logistics (UK) Ltd | Transport & logistics | 2007 |
| B Brownhills Ltd | Hospitality | 2026 |
| B E Building Ltd | Construction | 2024 |
| B G Building and Contractors Limited | Construction | 2017 |
| B G Building and Contracts Limited | Construction | 2017 |
| B G S Home Build Ltd | Construction | 2021 |
| B I B I Properties Limited | Real estate | 2003 |
| B Johnson & Sons Ltd | Transport & logistics | 2016 |
| B N D Care Services Ltd | Administrative & support | 2017 |
| B Price Mus-Max Specialist Ltd | Manufacturing | 2019 |
| B R 222 Logistics Ltd | Transport & logistics | 2026 |
| B Shearwood Ltd | Construction | 2016 |
| B Stanley and Sons Trading AS CLOUDY2CLEAR Walsall Limited | Construction | 2017 |
| B W Carpentry (WM) Limited | Manufacturing | 2026 |
| B&B Maintenance Ltd | Construction | 2025 |
| B&C International Supply Chain Ltd | Transport & logistics | 2021 |
| B&M Rentals Ltd | Wholesale & retail | 2025 |
| B-Laundry Limited | Other services | 2023 |
| B. Sansom Trailer Manufacturers Limited | Professional & scientific | 1978 |
| B.D.S. (123) Limited | Other services | 2022 |
| B.E. Brown (Builders) Limited | Construction | 1966 |
| B.G. Building Developments Ltd | Construction | 2012 |
| B.G. Estates (Midlands) Limited | Real estate | 2024 |
| B.I.Care Services Team Ltd | Health & social care | 2012 |
| B.J.D. Recycling Limited | Water & waste | 2009 |
| B.L.G Developments (Midlands) Ltd | Construction | 2025 |
| B.R.S Roofing Ltd | Construction | 2023 |
| B.S. Ashley Limited | Manufacturing | 1976 |
| B.Sansom Transport Company Limited | Wholesale & retail | 1972 |
| B106 Ltd | Information & communication | 2018 |
| B107 Limited | Real estate | 2020 |
| B2B Couriers Ltd | Transport & logistics | 2019 |
| B2Y Express Ltd | Transport & logistics | 2024 |
| Baarismill Ltd | Administrative & support | 2025 |
| Baba SRI Chand JI Foundation | Administrative & support | 2025 |
| BAC Impalloy Limited | Manufacturing | 2005 |
| Bace Integrated Services Ltd | Construction | 2026 |
| Back Office Pro Limited | Administrative & support | 2020 |
| Back Office Pro Motorsport Marketing Limited | Professional & scientific | 2022 |
| Back to YOU Healthcare Ltd | Health & social care | 2026 |