| AJM Electrics Ltd | Other services | 2019 |
| AJM Engineering Management Limited | Professional & scientific | 2010 |
| AJN Engineering Services Limited | Professional & scientific | 2017 |
| Ajon Consulting Ltd | Professional & scientific | 2020 |
| AJP Golf Ltd | Arts & recreation | 2018 |
| AJP Medical Writing Ltd | Other services | 2018 |
| AJR Design Engineering Limited | Professional & scientific | 2017 |
| AJR Quantity Surveying Limited | Administrative & support | 2012 |
| AJS Plumbing and Heating Engineering Ltd | Construction | 2006 |
| AJS Solution Services Ltd | Information & communication | 2018 |
| AJS Water Services Ltd | Professional & scientific | 2007 |
| AJS+ Ltd | Professional & scientific | 2025 |
| AJT Group Ltd | Information & communication | 2017 |
| AJW 25 Limited | Administrative & support | 2025 |
| AJW Falconry, Pest & Wildlife Management Ltd | Administrative & support | 2019 |
| AJW Security Solutions Limited | Administrative & support | 2023 |
| Ajwh Ltd | Transport & logistics | 2026 |
| AK Consultants Ltd | Administrative & support | 2022 |
| AK Engineering Solutions Ltd | Professional & scientific | 2017 |
| AK Geological Services Ltd | Other services | 2013 |
| AK Instrument Services Limited | Administrative & support | 2015 |
| AK Kitchen Warrington Ltd | Hospitality | 2026 |
| AK Pet Supplies Ltd | Wholesale & retail | 2022 |
| AK Solicitors Ltd | Professional & scientific | 2022 |
| AK Warrington Ltd | Hospitality | 2021 |
| AKA Store Limited | Wholesale & retail | 2023 |
| Akanksha Consulting Limited | Information & communication | 2015 |
| Akaru Social Ltd | Professional & scientific | 2023 |
| Akatsuki Engineering Limited | Professional & scientific | 2026 |
| AKC Construction Limited | Construction | 2017 |
| AKD Andrei Enterprise Limited | Administrative & support | 2015 |
| Akers Telecoms Limited | Construction | 2025 |
| AKF Accounts Ltd | Professional & scientific | 2021 |
| Akgulum Limited | Hospitality | 2013 |
| AKH Engineering Limited | Professional & scientific | 2018 |
| Akilma Limited | Professional & scientific | 2018 |
| Akkal Limited | Other services | 2018 |
| AKL Groundworks Ltd | Construction | 2024 |
| Akme Limited | Professional & scientific | 2017 |
| Aknrs Investments Ltd | Real estate | 2025 |
| Akod Consultants Limited | Administrative & support | 2014 |
| Akongcare CIC | Health & social care | 2026 |
| Akorns Limited | Professional & scientific | 2012 |
| AKP Rail Limited | Administrative & support | 2013 |
| Akrivia Consulting Ltd | Administrative & support | 2026 |
| AKS Engineered Planning Ltd | Professional & scientific | 2025 |
| AKS North West Ltd | Manufacturing | 2010 |
| Aks-Draughting Services Limited | Administrative & support | 2016 |
| Aksh Consultancy Limited | Other services | 2017 |
| Aksis Installations Limited | Administrative & support | 2025 |
| Aksmw Ltd | Manufacturing | 2025 |
| AKV Holdings Ltd | Financial services | 2026 |
| Akves Agency Limited | Wholesale & retail | 2019 |
| Akwilkinson Consulting Limited | Information & communication | 2015 |
| AL Cuts Barbershop Limited | Other services | 2026 |
| AL Medical Writing Limited | Health & social care | 2021 |
| AL Zakariya Ltd | Wholesale & retail | 2024 |
| Al-Razi EDU Ltd | Education | 2024 |
| ALA Transport Ltd | Transport & logistics | 2025 |
| Alam IT Services Limited | Information & communication | 2025 |
| Alan Elborough Consultancy Services Ltd | Professional & scientific | 2026 |
| Alan Nixon Ltd | Information & communication | 2016 |
| Alan’S Barber Shop Ltd | Other services | 2022 |
| Alard Engineering Consultants Ltd | Professional & scientific | 2019 |
| Alaric Engineering Limited | Administrative & support | 2025 |
| Alarm Response & Keyholding Limited | Administrative & support | 2005 |
| Albaante Limited | Wholesale & retail | 2025 |
| Albacore Technologies Ltd | Information & communication | 2015 |
| Albatross Tax Limited | Professional & scientific | 2023 |
| Alberini Consultancy Ltd | Administrative & support | 2025 |
| Albitas Investments Ltd | Construction | 2025 |
| Albre Consulting Limited | Information & communication | 2015 |
| Alcala Engineering Ltd | Professional & scientific | 2020 |
| Alcedo Consult Limited | Professional & scientific | 2022 |
| Alchemy Business and I.T Services Limited | Information & communication | 2010 |
| Alchemy Collectives Limited | Manufacturing | 2025 |
| Alchlor Limited | Administrative & support | 2003 |
| Alda Consultancy Limited | Administrative & support | 2025 |
| Aldane Advisory Ltd | Professional & scientific | 2026 |
| Alder Garden Services Ltd | Administrative & support | 2018 |
| Alderbrook Management BVI - Keyworker Limited | Construction | 2023 |
| Alderley Capital Limited Partnership | | 2006 |
| Aldersey Limited | Real estate | 2020 |
| Aldersonn Ltd | Wholesale & retail | 2026 |
| Alderstone Homes Limited | Construction | 2026 |
| Alderton Wilson Limited | Real estate | 2010 |
| Aleena Enterprises Limited | Administrative & support | 2008 |
| Aleisha Solutions Ltd | Information & communication | 2015 |
| Aleo Wellness Studio Limited | Other services | 2025 |
| Alert Inspection Services Ltd | Professional & scientific | 2018 |
| Alex Hartley CTR Projects Limited | Administrative & support | 2016 |
| Alex J Mills Limited | Information & communication | 2025 |
| Alex RAE Ltd | Wholesale & retail | 2023 |
| Alexander Clifford Limited | Professional & scientific | 2019 |
| Alexander Norton Limited | Professional & scientific | 2015 |
| Alexandru Dragos Limited | Other services | 2022 |
| Alexfruit&Veg Ltd | Wholesale & retail | 2025 |
| Aleynmoor Limited | Professional & scientific | 2011 |
| ALF Bass Medical Reporting Ltd | Health & social care | 2009 |
| Alfa Automation Engineering Limited | Professional & scientific | 2021 |