| Alpha Zone Club Ltd | Wholesale & retail | 2023 |
| Alpha&Co Limited | Wholesale & retail | 2024 |
| ALPHA11 Limited | Construction | 2019 |
| Alphadent Limited | Health & social care | 2014 |
| Alphafx Investments Limited | Financial services | 2023 |
| Alphalithe Ltd | Information & communication | 2019 |
| Alphalogix Ltd | Information & communication | 1998 |
| Alphamedix Limited | Real estate | 2015 |
| Alphatech Print & Data Services Limited | Manufacturing | 2017 |
| Alpine Car Sales Ltd | Wholesale & retail | 2019 |
| Alpine FOX Ltd | Wholesale & retail | 2022 |
| Alpine Rehab and Physiotherapy Ltd | Health & social care | 2026 |
| Alpine Utility Solutions Ltd | Professional & scientific | 2025 |
| Alpo Estates Ltd | Real estate | 2026 |
| Alquds Takeaway (Bolton) Ltd | Hospitality | 2026 |
| Alsa Consultants Ltd | Information & communication | 2016 |
| Alsa Investire Ltd | Real estate | 2021 |
| Alsadoon Ltd | Wholesale & retail | 2024 |
| Alsaf Trading Ltd | Wholesale & retail | 2024 |
| Alsasaur Ltd | Information & communication | 2026 |
| Alshaam Furniture Ltd | Wholesale & retail | 2026 |
| Altafs Fresh Produce Ltd | Wholesale & retail | 2016 |
| Altec Automotive (Global) Ltd | Wholesale & retail | 2024 |
| Alteratio Limited | Professional & scientific | 2013 |
| Altered State PMA Ltd | Information & communication | 2013 |
| Alternate Angel Limited | Wholesale & retail | 2025 |
| Alternative Accounts Ltd | Professional & scientific | 2025 |
| Altocrest Advisory Limited | Professional & scientific | 2024 |
| Altrincham Ice Hockey Club Limited | Arts & recreation | 2015 |
| Altura Aerial Photography Limited | Professional & scientific | 2014 |
| Altuscode Limited | Information & communication | 2018 |
| Aluminium Glazing Solutions UK Ltd | Manufacturing | 2025 |
| Aluminium House Ltd | Manufacturing | 2021 |
| Aluminium Window Warehouse Ltd | Manufacturing | 2021 |
| Alumni Ltd | Financial services | 2025 |
| Alveria Claim Group Ltd | Financial services | 2016 |
| Alveria Medical Services Ltd | Health & social care | 2016 |
| Alvida Limited | Financial services | 2024 |
| ALW Group (UK) Limited | Manufacturing | 2011 |
| Alwaan Arts Limited | Professional & scientific | 2026 |
| Always in OUR Thoughts Limited | Other services | 2023 |
| Alworths Ltd | Wholesale & retail | 2020 |
| ALY Capital Ltd | Financial services | 2025 |
| Alyk Design & Print Ltd | Manufacturing | 2026 |
| ALZ Logistics Ltd | Transport & logistics | 2025 |
| Alzzi Investments Ltd | Real estate | 2020 |
| AM & RM Properties Limited | Real estate | 2019 |
| AM Building Services (Bolton) Ltd | Construction | 2024 |
| AM Development Midlands Ltd | Construction | 2026 |
| AM Direct Ltd | Wholesale & retail | 2022 |
| AM Global Trading Ltd | Wholesale & retail | 2018 |
| AM Homes MCR Ltd | Real estate | 2017 |
| AM Motor Group Limited | Wholesale & retail | 2021 |
| AM Optics Ltd | Health & social care | 2019 |
| AM PO Limited | Wholesale & retail | 2026 |
| AM Practice Limited | Health & social care | 2025 |
| AM Property Invest Ltd | Real estate | 2020 |
| AM Psychotherapy & Counselling Limited | Health & social care | 2014 |
| AM Secure Ltd | Construction | 2018 |
| Am&S Limited | Health & social care | 2025 |
| AM1 Holdings Ltd | Real estate | 2024 |
| AM2 Consulting SRL Limited | Information & communication | 2024 |
| AMA Delivery Ltd | Transport & logistics | 2025 |
| AMA Meds Limited | Administrative & support | 2017 |
| AMA Trading Limited | Wholesale & retail | 2025 |
| Amaan Group Ltd | Wholesale & retail | 2022 |
| Amaan Holdings Limited | Administrative & support | 2018 |
| Amaan Logistics and Trading Company UK Ltd | Wholesale & retail | 2025 |
| Amaana Limited | Other services | 2023 |
| Amai Holding Limited | Financial services | 2025 |
| Amalaj Limited | Wholesale & retail | 2026 |
| Amalfi Autos Limited | Wholesale & retail | 2025 |
| Amalgamated Grace Ltd | Wholesale & retail | 2025 |
| Amanah Holding Group Ltd | Other services | 2023 |
| Amanat Waqf Ltd | Wholesale & retail | 2018 |
| Amanji Ltd | Health & social care | 2023 |
| Amans Traders Ltd | Wholesale & retail | 2026 |
| Amanstyle Ltd | Manufacturing | 2020 |
| Amar Care Ltd | Health & social care | 2017 |
| Amara Elite Homes Limited | Real estate | 2024 |
| Amara Energy Installations Ltd | Wholesale & retail | 2008 |
| Amara Property Management Limited | Households | 2018 |
| Amara Raja Limited | Construction | 2018 |
| Amari Cosmetics Ltd | Wholesale & retail | 2026 |
| Amaze Pharma Limited | Wholesale & retail | 2024 |
| Amazon Pointing Scaffolding & Roofing (Apsr) Ltd | Administrative & support | 2021 |
| AMAZONBOLTON786 Ltd | Wholesale & retail | 2023 |
| AMB Building Services Ltd | Construction | 2022 |
| Ambar Solutions Ltd | Information & communication | 2022 |
| Ambarx Ltd | Wholesale & retail | 2025 |
| Ambassadors Football Limited | Arts & recreation | 1996 |
| Ambegrouptrading Ltd | Wholesale & retail | 2024 |
| Amber and Oak Therapy CIC | Health & social care | 2026 |
| Amber Floral Design Ltd | Wholesale & retail | 2023 |
| Amber Green Care Limited | Health & social care | 2025 |
| Amber Marriott Consulting Limited | Information & communication | 2023 |
| Amberbeach Ltd. | Professional & scientific | 2015 |
| Amberian Limited | Wholesale & retail | 2024 |
| Amberley Group Holdings Limited | Financial services | 2025 |
| Ambitan Limited | Wholesale & retail | 2025 |