| Amber Housing Service Ltd | Real estate | 2018 |
| Ameco Electrical Services Ltd | Manufacturing | 2012 |
| Ameer & KO Ltd | Transport & logistics | 2022 |
| Ameer Taiba Properties Ltd | Households | 2026 |
| AMH (BHX) Limited | Wholesale & retail | 2024 |
| Aminacare Ltd | Health & social care | 2022 |
| Amir NAV Limited | Administrative & support | 2025 |
| Amma Convenient Store Ltd | Wholesale & retail | 2025 |
| Ammo Homes Limited | Real estate | 2021 |
| Ammo Services Ltd | Construction | 2018 |
| AMR Limited | Administrative & support | 2004 |
| Amrit and Ajit Charitable Trust Ltd | Health & social care | 2015 |
| Amrit Bani Radio Broadcasting Ltd | Information & communication | 2026 |
| Amrit Bani Radio Ltd | Other services | 2018 |
| Amrit Bani Radio U.K. Ltd | Information & communication | 2025 |
| Amrit Bani TV Ltd | Other services | 2024 |
| Amrita SEO Limited | Professional & scientific | 2026 |
| Amritsari Kitchen Ltd | Hospitality | 2026 |
| Amritsari Tarka Restaurant Ltd | Hospitality | 2021 |
| Amritsari Taste Restaurant Ltd | Hospitality | 2025 |
| Amritsari VEG Ltd | Hospitality | 2026 |
| AMY Trading UK, a Cutlery Company Ltd | Wholesale & retail | 2011 |
| Amy's Business Services Ltd | Administrative & support | 2025 |
| ANA Properties Solutions Limited | Real estate | 2020 |
| Anakh Productions Ltd | Transport & logistics | 2020 |
| Anas APPLIANCES1 Ltd | Wholesale & retail | 2023 |
| Anas Trading Ltd | Wholesale & retail | 2011 |
| Anco Property Solutions Ltd | Real estate | 2017 |
| Andersons Accountants & Tax Advisors Ltd | Professional & scientific | 2020 |
| Andracolu Ltd | Administrative & support | 2025 |
| Andy Gayle (MB) Services Limited | Wholesale & retail | 2002 |
| Angel Contracts Ltd | Construction | 2018 |
| Angel Street Limited | Wholesale & retail | 2015 |
| Angell Properties Ltd | Real estate | 2021 |
| Angell Solutions Ltd | Health & social care | 2015 |
| Anglian Projects Ltd | Construction | 2020 |
| Anil Joseph Ltd | Wholesale & retail | 2024 |
| ANJ Transport Limited | Transport & logistics | 2021 |
| Anmdrv Ltd | Transport & logistics | 2025 |
| Anmo Limited | Hospitality | 2025 |
| Anmol LOK Seva (UK) Limited | Other services | 2025 |
| Ann-Integrity Construction Company Limited | Construction | 2023 |
| Annamayya Limited | Hospitality | 2023 |
| Ansars Estate Agents Ltd | Financial services | 2013 |
| Antalya Hair Style Ltd | Other services | 2024 |
| Anur Logistics Ltd | Transport & logistics | 2019 |
| Anwar Auto Ltd | Wholesale & retail | 2026 |
| Aonese Limited | Transport & logistics | 2025 |
| AP Glazing Limited | Wholesale & retail | 2010 |
| AP House Ltd | Construction | 2018 |
| AP Pharmact Limited | Health & social care | 2018 |
| APB Services WM Ltd | Health & social care | 2025 |
| Apex Build & Develop Ltd | Construction | 2025 |
| Apex JDM Ltd | Wholesale & retail | 2026 |
| Apex Netsuite Specialist Ltd | Information & communication | 2021 |
| Apex Trio Ltd | Hospitality | 2025 |
| Apex Wholesale Group Ltd | Wholesale & retail | 2025 |
| Apexora Electrical Ltd | Construction | 2026 |
| Apexstone Consultancy Ltd | Professional & scientific | 2026 |
| APM Retail Group Limited | Wholesale & retail | 2023 |
| Apna Suppliers Ltd | Wholesale & retail | 2025 |
| Apni Awaz Ltd | Other services | 2025 |
| Apollo Management Ltd | Construction | 2020 |
| Apollo UK Estates Limited | Real estate | 2024 |
| Apple Energy Limited | Other services | 2016 |
| Aqua Holdings Limited | Professional & scientific | 1994 |
| AR Supermarket Ltd | Wholesale & retail | 2020 |
| Ar-Raqib Modest Fashion Limited | Wholesale & retail | 2021 |
| Arans Property Services Ltd | Hospitality | 2023 |
| ARC Trans Solutions Ltd | Transport & logistics | 2020 |
| Arcade Investment G Ltd | Construction | 2022 |
| Arcata Solutions Ltd | Construction | 2020 |
| Archways Property Group Ltd | Real estate | 2023 |
| Arden Medical (PVT) Limited | Health & social care | 2024 |
| ARG Contractors Ltd | Transport & logistics | 2025 |
| Arian Food Store Limited | Wholesale & retail | 2022 |
| Arianna Constructions and Cleaning Ltd | Construction | 2023 |
| Arias M Limited | Transport & logistics | 2021 |
| Arjun Catering Limited | Hospitality | 2015 |
| ARK Haulage Ltd | Transport & logistics | 2019 |
| ARK Invest Ltd | Other services | 2006 |
| Armaan Auto Ltd | Wholesale & retail | 2023 |
| Armstrong Physiotherapy Clinic Ltd | Health & social care | 2025 |
| Arnveer Courier Ltd | Transport & logistics | 2025 |
| Aroma Smethwick Limited | Hospitality | 2022 |
| Arora IT Solution Limited | Information & communication | 2026 |
| Aroras Store Ltd | Wholesale & retail | 2025 |
| ARPE2025 Ltd | Hospitality | 2025 |
| Arrk Accessories Ltd | Wholesale & retail | 2020 |
| Arrow Haulage UK Limited | Transport & logistics | 2025 |
| Arrow Recycling Limited | Administrative & support | 2011 |
| Arrow UK Holdings Limited | Financial services | 2020 |
| Arrow UK Homes Limited | Real estate | 2023 |
| Art B Consulting Ltd | Wholesale & retail | 2021 |
| Arte Creative Design Limited | Manufacturing | 2008 |
| Arya Kaur Ltd | Real estate | 2024 |
| AS Bodywork Specialist Ltd | Wholesale & retail | 2026 |
| AS Construction Group Ltd | Construction | 2020 |
| ASA Solutions Ltd | Construction | 2020 |
| Asaa AMS Ltd | Wholesale & retail | 2023 |