| ASB Solutions Ltd | Construction | 2020 |
| ASB Trade Ltd | Wholesale & retail | 2025 |
| ASC Construction Group Ltd | Financial services | 2023 |
| ASC Properties WM Ltd | Real estate | 2020 |
| ASC Solutions Ltd | Construction | 2020 |
| Ascaso Limited | Wholesale & retail | 2016 |
| ASD Services Midland Ltd | Construction | 2025 |
| Asderzm Ltd | Hospitality | 2025 |
| Asees Property Ltd | Real estate | 2026 |
| ASG Music Limited | Wholesale & retail | 2007 |
| ASG Pharma Ltd | Wholesale & retail | 2016 |
| ASG Projects Ltd | Real estate | 2012 |
| ASH & Lacy Automotive Holdings Limited | Financial services | 2021 |
| ASH & Lacy Automotive Limited | Manufacturing | 1954 |
| ASH & Lacy Building Systems Holdings Limited | Financial services | 2021 |
| ASH & Lacy Building Systems Limited | Manufacturing | 1917 |
| ASH & Lacy Finishes Holdings Limited | Financial services | 2021 |
| ASH & Lacy Finishes Limited | Manufacturing | 2017 |
| ASH & Lacy Group Limited | Financial services | 2021 |
| ASH & Lacy Holdings Limited | Financial services | 2011 |
| ASH & Lacy Perforating Holdings Limited | Financial services | 2021 |
| ASH & Lacy Perforating Limited | Manufacturing | 2017 |
| ASH & Lacy Pressings Limited | Manufacturing | 2012 |
| ASH & Lacy Profiles Limited | Manufacturing | 2013 |
| ASH & Lacy Solutions Holdings Limited | Financial services | 2021 |
| ASH & Lacy Solutions Limited | Manufacturing | 2017 |
| ASH Khan Fresh Fruit & VEG Limited | Wholesale & retail | 2021 |
| ASH Properties WM Ltd | Real estate | 2025 |
| ASH Transport U.K. Limited | Transport & logistics | 2025 |
| Ashfield Management Limited | Construction | 2017 |
| Ashwood Leather Ltd | Wholesale & retail | 2025 |
| Ashworth Pharmacy Limited | Wholesale & retail | 1997 |
| Asia Money Transfer Ltd | Financial services | 2001 |
| Asian Traders (MFG) Community Limited | Health & social care | 2023 |
| ASK Property & Investments Ltd | Real estate | 2021 |
| ASK Services WM Ltd | Transport & logistics | 2020 |
| Askari D Limited | Health & social care | 2026 |
| ASP Homes Ltd | Real estate | 2025 |
| ASP Property Investments Limited | Real estate | 2018 |
| Aspine Ltd | Health & social care | 2026 |
| Assembly Line International C.I.C. | Arts & recreation | 2017 |
| AST Computers Ltd | Construction | 2020 |
| AST Couriers Ltd | Construction | 2020 |
| AST Software Ltd | Construction | 2020 |
| AST Solutions WM Ltd | Construction | 2020 |
| Aston Reid Limited | Construction | 2024 |
| ASU Travel Corporation Ltd | Administrative & support | 2024 |
| Asya International Market Ltd | Wholesale & retail | 2025 |
| AT Digital Services Ltd | Information & communication | 2025 |
| AT Systems Ltd | Construction | 2023 |
| Athaliah's Artistry Limited | Other services | 2024 |
| Athwal Real Estate Ltd | Real estate | 2020 |
| Atoneclickltd Ltd | Wholesale & retail | 2025 |
| Atpac Limited | Administrative & support | 2012 |
| Atticus Creative & Cultural Consultancy Ltd | Professional & scientific | 2021 |
| Attitude Luxury Hair & Beauty Ltd | Other services | 2026 |
| Auburn Solutions Ltd | Construction | 2020 |
| Aurabean Ltd | Wholesale & retail | 2026 |
| AURABLOOM321 Ltd | Wholesale & retail | 2025 |
| Aurora Education CC Ltd | Education | 2023 |
| Aurora Inovate Ltd | Real estate | 2024 |
| Auroras Take Aways Ltd | Hospitality | 2024 |
| Aurum Suites Ltd | Hospitality | 2025 |
| Autiscan AI Ltd | Information & communication | 2026 |
| Auto Diagnostic Center Limited | Wholesale & retail | 2013 |
| Auto Smartmotor Ltd | Manufacturing | 2019 |
| Auto Stop Repair Ltd | Wholesale & retail | 2021 |
| Auto Vector Ltd | Wholesale & retail | 2026 |
| Autofit Birmingham Ltd | Wholesale & retail | 2026 |
| Autolink Warehouse Limited | Wholesale & retail | 2018 |
| Automan Financial Limited | Administrative & support | 2013 |
| Automate Restauration Ltd | Wholesale & retail | 2025 |
| Automax Limited | Wholesale & retail | 2006 |
| Automotive Competency Certification Inc Ltd | Education | 2025 |
| Autotrackershop Ltd | Other services | 2025 |
| AV Construction U.K. Ltd | Construction | 2025 |
| AV Essentials and Items Ltd | Wholesale & retail | 2022 |
| AV Global Contruction UK Ltd | Construction | 2024 |
| AV Roofers Limited | Construction | 2026 |
| AVA Motors Limited | Wholesale & retail | 2022 |
| Aventia Pharma Ltd | Financial services | 2023 |
| Avery Stores Ltd | Wholesale & retail | 2025 |
| AVI Photography and Video Ltd | Professional & scientific | 2025 |
| AVI Property Management Ltd | Real estate | 2024 |
| Avitaz Transport Ltd | Transport & logistics | 2022 |
| Avninder Kaur Mahal Limited | Extraterritorial | 2025 |
| Avon Sports Bar Limited | Hospitality | 2011 |
| AVS Delivery Ltd | Transport & logistics | 2025 |
| Avtar Air Conditioner & Refrigeration Ltd | Manufacturing | 2026 |
| Avtar Courier Services Ltd | Transport & logistics | 2017 |
| Avyaan Construction Ltd | Construction | 2025 |
| AW Floors Ltd | Wholesale & retail | 2019 |
| AYA Naan & More Ltd | Hospitality | 2024 |
| Aykiz Clothing Limited | Wholesale & retail | 2025 |
| AYS Hospitality Limited | Other services | 2018 |
| Aysourced Ltd | Wholesale & retail | 2026 |
| Ayub Associates Limited | Wholesale & retail | 2019 |
| Ayyaz Aslam Ltd | Education | 2024 |
| AZ Radio Cars Ltd | Transport & logistics | 2012 |
| Azad Communications Corporation Ltd | Wholesale & retail | 2015 |