| Alliance Surgical Investments Secretarial Services Limited | Health & social care | 2007 |
| Alliance Surgical PLC | Professional & scientific | 2004 |
| Alliance Trades Limited | Wholesale & retail | 2025 |
| Alliance Transport Technologies Ltd | Transport & logistics | 2017 |
| Allice Nails and Beauty Ltd | Other services | 2023 |
| Allied Sovereign(Rak) Financial Services Limited | Real estate | 2004 |
| Allied Accommodations Ltd | Real estate | 2024 |
| Allied Accountants & Tax Consultants Ltd | Professional & scientific | 2022 |
| Allied Ample (UK) Limited | Real estate | 2017 |
| Allied Construction Group Ltd | Construction | 2025 |
| Allied Copper Alloys Limited | Administrative & support | 2002 |
| Allied ENT UK Limited | Health & social care | 2025 |
| Allied Golf Ltd | Wholesale & retail | 2013 |
| Allied Hire Ltd | Administrative & support | 2026 |
| Allied Housing Solutions Ltd | Real estate | 2019 |
| Allied Pallets Solutions UK Ltd | Water & waste | 2022 |
| Allied Protection Ltd | Wholesale & retail | 2023 |
| Allied Security Services Ltd | Administrative & support | 2021 |
| Allied Student Accommodation Limited | Real estate | 2018 |
| Allied Travel Solutions Ltd | Transport & logistics | 2023 |
| Allied Wholesale Distribution Ltd | Wholesale & retail | 2022 |
| Allied Workforce Solutions Limited | Administrative & support | 2026 |
| Alliedbay Limited | Administrative & support | 1991 |
| Allies Care and Support Services Limited | Education | 2020 |
| Allies Network C.I.C. | Education | 2014 |
| Alligator Drains UK Limited | Professional & scientific | 2023 |
| Allinone Home and Beauty Ltd | Wholesale & retail | 2024 |
| Allinone-Arcade Ltd | Professional & scientific | 2024 |
| Allinonecateringkitchen Ltd | Hospitality | 2025 |
| Allintrader Limited | Wholesale & retail | 2025 |
| Allison House (Digbeth) Limited | Health & social care | 2009 |
| Allison Wells Solicitors Ltd | Professional & scientific | 2022 |
| Allium Textiles Limited | Wholesale & retail | 2011 |
| Allkraft Design Ltd | Professional & scientific | 2023 |
| Allkraft-Build Ltd | Manufacturing | 2024 |
| Allmake Motor Parts Limited | Wholesale & retail | 1996 |
| Allmarks Products Limited | Wholesale & retail | 2017 |
| Allmass Ltd | Real estate | 2026 |
| Allmetal & Construction Limited | Construction | 2008 |
| Allmid Limited | Construction | 1985 |
| Allmpdiss Holdings Limited | Professional & scientific | 2011 |
| Allnosiv Ltd | Health & social care | 2025 |
| Alloo Consultancy Limited | Professional & scientific | 2007 |
| Allopathic Healthcare Ltd | Wholesale & retail | 2020 |
| Alloy Expert Limited | Wholesale & retail | 2024 |
| Alloys at Autosmart Limited | Wholesale & retail | 2008 |
| Allsafe Electrical Services Limited | Construction | 2008 |
| Allscope Property Services Limited | Real estate | 2009 |
| Allsecured Aluminium Solutions Ltd | Extraterritorial | 2020 |
| Allsecured Garage & Industrial Doors Limited | Manufacturing | 2008 |
| Allshuttersuk Limited | Construction | 2018 |
| Allsopp Financial Management Limited | Financial services | 2005 |
| Allss Limited | Construction | 2025 |
| Allstarfoods Limited | Hospitality | 2019 |
| Allstyle Door & Gate Services Limited | Construction | 2002 |
| Alltrack Supply Limited | Wholesale & retail | 2025 |
| Allumette Ltd | Financial services | 2016 |
| Allure Automotive Ltd | Wholesale & retail | 2024 |
| Allure Lashes UK Ltd | Other services | 2026 |
| Allure Mart Ltd | Wholesale & retail | 2025 |
| Alluviana Limited | Manufacturing | 2025 |
| Allvent Limited | Manufacturing | 1984 |
| Ally General Traders Limited | Administrative & support | 2023 |
| Allyson Thomas Limited | Manufacturing | 2017 |
| Ally’S Beauty & Wellness C.I.C. | Other services | 2025 |
| ALM Lonsdale Consulting Limited | Professional & scientific | 2022 |
| ALM Micros Limited | Wholesale & retail | 2025 |
| ALM Optical Ltd | Health & social care | 2024 |
| ALM Pharm UK Limited | Wholesale & retail | 2019 |
| ALM Property Investments Limited | Real estate | 2023 |
| ALM Social Care Solutions Limited | Health & social care | 2011 |
| ALM Trading Limited | Wholesale & retail | 2017 |
| Alma Entertainment Ltd | Wholesale & retail | 2020 |
| Alma SS Group Ltd | Health & social care | 2026 |
| Almadinaperfumes Limited | Wholesale & retail | 2022 |
| Almamy Enterprise Limited | Wholesale & retail | 2025 |
| Almari Trading Ltd | Wholesale & retail | 2019 |
| Almas Perfume Limited | Wholesale & retail | 2023 |
| Almasb UK Ltd | Professional & scientific | 2023 |
| Almaskiya Ltd | Wholesale & retail | 2025 |
| Almata Ltd | Wholesale & retail | 2022 |
| Almd Properties Ltd | Real estate | 2019 |
| Almedina Bakery Ltd | Manufacturing | 2023 |
| Almighty Bite Ltd | Hospitality | 2023 |
| Almighty Fighting Championship Ltd | Arts & recreation | 2026 |
| Almik Limited | Health & social care | 2012 |
| Almis Investments Limited | Administrative & support | 2018 |
| Almo Builders (UK1) Limited | Wholesale & retail | 2019 |
| Almo Bulders (UK) Limited | Wholesale & retail | 2011 |
| Almo Luxury Hire Limited | Administrative & support | 2022 |
| Almocha Cafe Ltd | Hospitality | 2025 |
| Almond Blossom EST Ltd | Real estate | 2020 |
| Almond Direct Ltd | Real estate | 2024 |
| Almond House Management Company Limited | Real estate | 2022 |
| Almond Toast &Juice Co Ltd | Manufacturing | 2024 |
| Almoso Ltd | Construction | 2026 |
| Alms Corporate Services Limited | Professional & scientific | 2007 |
| Almuneer Islamic Store Ltd | Wholesale & retail | 2023 |
| Almutari Consultancy Ltd | Administrative & support | 2025 |
| ALN Distributions Ltd | Wholesale & retail | 2025 |