| Allied Carpets at Home Limited | Wholesale & retail | 2020 |
| Allied Chemicals(Uk) Limited | Extraterritorial | 2020 |
| Allied Global Partners Limited | Wholesale & retail | 2020 |
| Allied Health UK Ltd | Health & social care | 2023 |
| Allied Marketing Services Limited | Professional & scientific | 2020 |
| Allied Mechanical Engineering Limited | Manufacturing | 2002 |
| Allied Site Personnel Limited | Construction | 2016 |
| Allied Standard Group Ltd | Information & communication | 2025 |
| Allied Star Contracting Company Ltd | Wholesale & retail | 2026 |
| Allied Storage Tanks Limited | Manufacturing | 2014 |
| Alligare Holdings (UK) Limited | Financial services | 2020 |
| Alliman Ltd | Health & social care | 2023 |
| Allington Services Limited | Arts & recreation | 2021 |
| Allione Ltd | Transport & logistics | 2016 |
| Alllink Household UK Limited | Wholesale & retail | 2020 |
| Allmax Limited | Wholesale & retail | 2021 |
| Allmotive Limited | Extraterritorial | 2007 |
| Allmusic Limited | Wholesale & retail | 2017 |
| Allocate Ltd | Real estate | 2020 |
| Allora Design & Build Ltd | Construction | 2022 |
| Alloyengineerss Ltd | Wholesale & retail | 2021 |
| Alloyguys Limited | Manufacturing | 2025 |
| Allround Security Services Ltd | Administrative & support | 2025 |
| Allsaint Leisure Ltd | Hospitality | 2016 |
| Allstone (SW) Limited | Manufacturing | 2014 |
| Alltmore Properties Limited | Real estate | 2021 |
| Alluracart Ltd | Wholesale & retail | 2026 |
| Allure Group Brokers Ltd | Real estate | 2024 |
| Allure INK Studios Ltd | Other services | 2025 |
| Allweld (Wales) Limited | Manufacturing | 2007 |
| Allwood Engineering Solutions Ltd | Manufacturing | 2026 |
| Ally Main Ltd | Wholesale & retail | 2025 |
| Allyace Capital Ltd | Real estate | 2022 |
| Allyace Ltd | Other services | 2016 |
| ALM Bars Limited | Hospitality | 2022 |
| Alma Consultancy Limited | Construction | 2025 |
| Alma Europe | Administrative & support | 2026 |
| Alma Trade PC | | 2017 |
| Alma Y Luna Ltd | Health & social care | 2021 |
| Almaan Limited | Hospitality | 2023 |
| Almadad Alsaatie Trade Ltd | Energy | 2025 |
| Almaden UK Ltd | Information & communication | 2021 |
| Almaim Ltd | Wholesale & retail | 2022 |
| Alman Fashion Limited | Wholesale & retail | 2024 |
| Almape Holdings Limited | Financial services | 2023 |
| Almare Services Ltd | Health & social care | 2017 |
| Almasar Limited | Information & communication | 2019 |
| Almass Restaurant Limited | Hospitality | 2018 |
| Almatris Limited | Real estate | 2021 |
| Almendra Labs Ltd | Wholesale & retail | 2026 |
| Almeraaj Solutions Ltd | Administrative & support | 2017 |
| Almila Collection Ltd | Wholesale & retail | 2025 |
| Almir Group PC | | 2023 |
| Almizana Ltd | Wholesale & retail | 2025 |
| Almo Recruitment Ltd | Administrative & support | 2024 |
| Almocado London Ltd | Manufacturing | 2010 |
| Almohaimin Ltd | Hospitality | 2026 |
| Almond Global General Trading Limited | Wholesale & retail | 2025 |
| Almond Property Estates Limited | Real estate | 2020 |
| Almuntasier Trading Limited | Wholesale & retail | 2025 |
| Almusawwir Limited | Wholesale & retail | 2025 |
| Alnada Plus Trading Limited | Wholesale & retail | 2025 |
| Alnazadenx Ltd | Wholesale & retail | 2025 |
| Alnwick Wedding Chauffeur Cars Ltd | Transport & logistics | 2021 |
| Alobcy Ltd | Administrative & support | 2017 |
| Aloeveez Ltd | Construction | 2021 |
| Aloralights Ltd | Wholesale & retail | 2025 |
| ALP Supported Living Services Limited | Health & social care | 2005 |
| Alpaca Taxis Limited | Transport & logistics | 2025 |
| Alpagut Ltd | Wholesale & retail | 2025 |
| Alpai LLP | | 2025 |
| Alpakka Ltd | Wholesale & retail | 2017 |
| Alpenn Engineering Ltd | Professional & scientific | 2013 |
| Alph Services Ltd | Manufacturing | 2025 |
| Alpha & Yapps EOT Limited | Professional & scientific | 2024 |
| Alpha Abode Limited | Real estate | 2024 |
| Alpha and Omega Businesses Ltd | Wholesale & retail | 2019 |
| Alpha Bravo Catering Ltd | Hospitality | 2025 |
| Alpha Capital Venture Ltd | Wholesale & retail | 2025 |
| Alpha Centauri Private Limited | Wholesale & retail | 2025 |
| Alpha Construction Team Ltd | Construction | 2014 |
| Alpha Consult and Trading [Debt] Ltd | Wholesale & retail | 2025 |
| Alpha Core Group Ltd | Administrative & support | 2018 |
| Alpha Dating Ltd. | Information & communication | 2012 |
| Alpha Drives and Landscapes Ltd | Administrative & support | 2025 |
| Alpha Foodservice Ltd | Administrative & support | 2022 |
| Alpha Garages (Cardiff) Limited | Wholesale & retail | 1977 |
| Alpha Group Logistics Ltd | Construction | 2018 |
| Alpha Group Partnership Ltd | Arts & recreation | 2023 |
| Alpha Imperial LLP | | 2025 |
| Alpha ING Ltd | Professional & scientific | 2020 |
| Alpha Investment Group PC | | 2020 |
| Alpha Iota Systems Ltd | Information & communication | 2019 |
| Alpha Marine Management Services Limited | Transport & logistics | 2021 |
| Alpha Omega SAS Ltd | Wholesale & retail | 2020 |
| Alpha One Contractors Ltd | Construction | 2023 |
| Alpha One Internet Solutions Ltd | | 2003 |
| Alpha Project Developments Limited | Construction | 2025 |
| Alpha PVT Ltd | Construction | 2023 |
| Alpha Roofing South West Ltd | Construction | 2015 |