| Auto E Recovery Ltd | Water & waste | 2025 |
| Auto Seby Limited | Wholesale & retail | 2023 |
| Auto Valet Detailing Ltd | Wholesale & retail | 2026 |
| Autohauss Ltd | Wholesale & retail | 2022 |
| Automart Direct Limited | Wholesale & retail | 2010 |
| Automotive Chemicals Limited | Professional & scientific | 1961 |
| Automotive Drive Ltd | Transport & logistics | 2025 |
| Automotive Management Consultants Limited | Administrative & support | 2014 |
| Autonomy Live Ltd | Arts & recreation | 2021 |
| Autoshield Ltd | Wholesale & retail | 2023 |
| Autoswap Ltd | Wholesale & retail | 2024 |
| Autothink Group Ltd | Information & communication | 2022 |
| Autowhizz Ltd | Wholesale & retail | 2020 |
| Auxano Group Ltd | Wholesale & retail | 2021 |
| Avalon Electrical Limited | Construction | 2011 |
| Avant Holdings Limited | Other services | 2023 |
| Avanti Group Limited | Construction | 2014 |
| AVE Air Ltd | Manufacturing | 2026 |
| Avermont & Co Ltd | Administrative & support | 2026 |
| AW Convenience Store Ltd | Wholesale & retail | 2026 |
| AW Offshore Services Ltd | Professional & scientific | 2023 |
| Awakening Minds Practice CIC | Education | 2019 |
| Awal PVT Ltd | Manufacturing | 2025 |
| Awan Motor Group Limited | Wholesale & retail | 2023 |
| Awan Textile Mills Limited | Wholesale & retail | 2021 |
| AX Italia Ltd | Wholesale & retail | 2019 |
| Axcap Consultancy Limited | Professional & scientific | 2020 |
| Axel Trading Limited | Real estate | 2014 |
| Axentra Hub Ltd | Wholesale & retail | 2026 |
| Axia Management Services Limited | Administrative & support | 1986 |
| Axiom Vehicles Ltd | Wholesale & retail | 2025 |
| Axispoint Consulting Limited | Wholesale & retail | 2025 |
| Axlinic Ltd | Health & social care | 2024 |
| AY Customs Ltd | Wholesale & retail | 2024 |
| AYA & I Limited | Wholesale & retail | 2016 |
| Ayaan Foods (NW) Ltd | Hospitality | 2023 |
| Ayala Solutions Limited | Administrative & support | 2025 |
| Ayam Essentials Ltd | Wholesale & retail | 2026 |
| Ayden Motor Group Ltd | Wholesale & retail | 2026 |
| Aylanto Limited | Hospitality | 2019 |
| Aylasco Ltd | Wholesale & retail | 2025 |
| Aylo Designs Ltd | Arts & recreation | 2022 |
| Aymen & Marwa Ltd | Wholesale & retail | 2025 |
| Ayoob Properties Ltd | Real estate | 2025 |
| AYR Global Ltd | Wholesale & retail | 2018 |
| Ayub Engineering Limited | Professional & scientific | 2024 |
| Ayub Ltd | Health & social care | 2012 |
| Ayva Trading Ltd | Real estate | 2021 |
| Ayvana Group Ltd | Wholesale & retail | 2025 |
| Ayzaa Ltd | Wholesale & retail | 2025 |
| AZ Couriers NW Ltd | Transport & logistics | 2025 |
| AZ Executive Chauffeur Ltd | Transport & logistics | 2026 |
| AZ Planet Ltd | Extraterritorial | 2022 |
| Azam Holdings Ltd | Financial services | 2022 |
| Azaqs Property Group Ltd | Real estate | 2026 |
| Azaronyx Limited | Wholesale & retail | 2026 |
| Azbycx Ltd | Real estate | 2023 |
| Azcoglobal Ltd | Wholesale & retail | 2023 |
| Azeem Textiles Limited | Wholesale & retail | 2009 |
| AZH Traders Ltd | Wholesale & retail | 2026 |
| AZIZGP88 Limited | Health & social care | 2021 |
| AZK Optical Ltd | Health & social care | 2019 |
| AZM Consultants Limited | Professional & scientific | 2022 |
| Azml Limited | Hospitality | 2022 |
| Aztec Trading Limited | Information & communication | 2023 |
| Azure Building Company Ltd | Construction | 2022 |
| Azure Cloud DEV Limited | Information & communication | 2024 |
| B & B Furniture Ltd | Wholesale & retail | 2025 |
| B & L Johnson Properties Ltd | Real estate | 2023 |
| B & Sons Plumbing & Heating Supplies Ltd | Wholesale & retail | 2025 |
| B and C Property Maintenance Ltd | Administrative & support | 2025 |
| B and S Fuel Maintenance Ltd | Professional & scientific | 2023 |
| B Barriers CIC | Education | 2020 |
| B Sensory Ltd | Education | 2023 |
| B&M Technologies Ltd | Information & communication | 2021 |
| B&R Cleanery Limited | Administrative & support | 2020 |
| B. Aesthetically Pleasing Ltd | Other services | 2019 |
| B. C. Real Estate Limited | Real estate | 2016 |
| B.A.R.C (Rochdale) Ltd | Wholesale & retail | 2010 |
| B.Davis Transport Ltd | Transport & logistics | 2026 |
| B.M.R. (Finance) Limited | | 1979 |
| B.S.C.A.H. | Other services | 2004 |
| BA GAS Services Limited | Construction | 2023 |
| Babli Begum Ltd | Wholesale & retail | 2022 |
| Babs Falola and Sons Limited | Administrative & support | 2014 |
| Baby Face Aesthetics Limited | Health & social care | 2019 |
| Babylon Night Ltd | Hospitality | 2025 |
| BAC Civils Limited | Professional & scientific | 2024 |
| Badalika Ltd | Wholesale & retail | 2025 |
| Badar Sons Ltd | Wholesale & retail | 2026 |
| Badboy Express Ltd | Hospitality | 2025 |
| Badboy Kebabs Liverpool Limited | Hospitality | 2025 |
| Badsworth Financial Limited | Financial services | 2025 |
| Badsworth Property Ltd | Real estate | 2022 |
| Bafashionsuk Ltd | Manufacturing | 2024 |
| Baig Pharma Ltd | Health & social care | 2018 |
| BAK Autos Ltd | Wholesale & retail | 2025 |
| Bake & Vape Ltd | Wholesale & retail | 2026 |
| Bake B Limited | Administrative & support | 2006 |
| Baker Bennett Limited | Administrative & support | 1994 |