| Applecoat Limited | Manufacturing | 2017 |
| Appletree Stoke Limited | Construction | 2005 |
| Applewood Joinery (Stoke) Limited | Construction | 2026 |
| Applied Intelligence Collective Limited | Administrative & support | 2025 |
| Applied Intelligence Ventures Limited | Administrative & support | 2025 |
| Applied Management Systems Limited | Professional & scientific | 2000 |
| Applied Radiators (2015) Limited | Financial services | 2015 |
| Applied Radiators Group Ltd | Financial services | 2022 |
| Applied Radiators Holdings Limited | Financial services | 2013 |
| Applied Radiators Limited | Other services | 1994 |
| APPLY24 Ltd | Information & communication | 2023 |
| Appolo Community Support CIC | Manufacturing | 2023 |
| Approved Rubber Roofing Contractors Limited | Construction | 2005 |
| APPS4 Web Media Limited | Information & communication | 2017 |
| Apricus Med-Tech UK Ltd | Information & communication | 2020 |
| April Seven Ltd | Financial services | 2018 |
| APS Distribution Limited | Wholesale & retail | 2017 |
| APS Legal Ltd | Professional & scientific | 2025 |
| Apsi Vehicle Hire Ltd | Administrative & support | 2026 |
| Apstar Limited | Information & communication | 1988 |
| APT Architectural Services Ltd | Professional & scientific | 2019 |
| APT Health and Safety Apprenticeships Ltd | Education | 2016 |
| APT Health and Safety Consultancy Limited | Administrative & support | 2014 |
| APT Health and Safety Training Solutions Ltd | Administrative & support | 2013 |
| APT Recruitment Ltd | Administrative & support | 2019 |
| Aptide Limited | Professional & scientific | 2008 |
| Aptitude Capital Limited | Real estate | 2026 |
| Aptitude Construction Limited | Construction | 2024 |
| Aptitude Property Investments Limited | Real estate | 2025 |
| Aptitude Property Limited | Real estate | 2025 |
| Aqsa Projects Ltd | Construction | 2026 |
| Aqua Lime Health Care Ltd | Public administration | 2022 |
| Aqua-Bio UK Limited | Manufacturing | 2001 |
| Aqual Training Ltd | Education | 2025 |
| Aquaseal Homecare Limited | Construction | 2010 |
| Aquila Purchasing Consortium Ltd | Wholesale & retail | 2026 |
| Aquila Trading Limited | Wholesale & retail | 2016 |
| Aquinas Property Ltd | Real estate | 2020 |
| Aquira Customer Insight Limited | Information & communication | 2015 |
| AR Carpets and Flooring Ltd | Wholesale & retail | 2014 |
| AR Cars Stoke Ltd | Wholesale & retail | 2025 |
| AR Graphics & Printing Solutions Ltd | Manufacturing | 2023 |
| AR Leisure Limited | Hospitality | 2020 |
| AR Lounge Limited | Information & communication | 2018 |
| AR Lowe Heating & Plumbing Ltd | Construction | 2020 |
| AR Naylor Consulting Limited | Professional & scientific | 2012 |
| AR1 Homecare Limited | Health & social care | 2013 |
| AR1 Real Estate Limited | Real estate | 2025 |
| Arabella’S Coffee House Ltd | Hospitality | 2020 |
| Arabiya School Midlands | Education | 2015 |
| ARB ( Tree Care Specialists ) Limited | Agriculture & fishing | 2002 |
| Arca Services Ltd | Transport & logistics | 2016 |
| Arch Publishing Ltd | Information & communication | 2006 |
| Archaeological Solutions Limited | Arts & recreation | 2003 |
| Architecture Done Differently Ltd | Professional & scientific | 2025 |
| Archview Services Ltd | Wholesale & retail | 2026 |
| Archway Housing Ltd | Real estate | 2011 |
| Arclyde Limited | Manufacturing | 2025 |
| Arco Cleaning Solutions Limited | Administrative & support | 2014 |
| Arcs Transit Ltd | Transport & logistics | 2025 |
| Arctic Bathrooms Limited | Construction | 2015 |
| Arctic Monkey Ltd | Construction | 2026 |
| Ardas Transport Ltd | Transport & logistics | 2021 |
| Ardic&Co Ltd | Wholesale & retail | 2025 |
| Areca Service Ltd | Manufacturing | 2015 |
| Areena Ltd | Wholesale & retail | 2025 |
| Ares-Tac Academy Ltd | Education | 2026 |
| ARH Holdco Limited | Financial services | 2019 |
| ARI Cut’S Ltd | Other services | 2026 |
| Arif's Holdings Limited | Financial services | 2024 |
| Arih Commercial Ltd | Real estate | 2025 |
| Arih Properties Ltd | Households | 2023 |
| Ariise Ltd | Health & social care | 2016 |
| Arise & Thrive Academy Ltd | Information & communication | 2020 |
| Arise Global Women for Change CIC | Hospitality | 2020 |
| Arise Supported Living Ltd | Health & social care | 2021 |
| Arisha Healthcare Limited | Health & social care | 2014 |
| Arivatex Limited | Wholesale & retail | 2003 |
| Arkade Digital Limited | Information & communication | 2024 |
| Arkade Renovation Ltd | Real estate | 2025 |
| Arkadius Solutions Limited | Wholesale & retail | 2019 |
| Arklu Ltd | Wholesale & retail | 2010 |
| Arkmedia Ltd | Professional & scientific | 2025 |
| Arlington Funeral Services Limited | Other services | 2001 |
| Arma-Hire Ltd | Wholesale & retail | 2023 |
| Armaan Fast Food Ltd | Hospitality | 2026 |
| ARMCO-BARRIERS4U Ltd | Water & waste | 2018 |
| Armour Roofing Specialists Ltd | Construction | 2018 |
| Arms Healthcare Ltd | Health & social care | 2023 |
| Armstrong Bainbridge Storage Ltd | Transport & logistics | 2024 |
| Arnhem Solutions Limited | Wholesale & retail | 2024 |
| Arni (Midlands) Ltd | Construction | 2019 |
| Arni Architects Ltd | Professional & scientific | 2016 |
| Arni Design + Build Ltd | Construction | 2018 |
| Arni Ltd | Real estate | 2018 |
| Arnold Financial Services Ltd | Financial services | 2023 |
| ARO Search Ltd | Administrative & support | 2023 |
| Aronleja Ltd | Construction | 2024 |
| Arrgo Property Ventures Limited | Real estate | 2026 |
| Arribamobility Limited | Professional & scientific | 2013 |