| AOE Healthcare Ltd | Administrative & support | 2024 |
| AP Commercial Developments Limited | Real estate | 2022 |
| AP Electrical Contractors Ltd | Construction | 2010 |
| AP Marion Training Ltd | Education | 2025 |
| AP Property SW Ltd | Real estate | 2024 |
| Apani Care Limited | Health & social care | 2023 |
| Apbt Ltd | Households | 2025 |
| Apca (Investments) Ltd | Real estate | 2021 |
| Apca Construction Ltd | Construction | 2024 |
| Apca Group Ltd | Professional & scientific | 2020 |
| APD Performance Ltd | Other services | 2025 |
| Apec Electrical & Property Services Ltd | Construction | 2015 |
| Apec Mechanical & Plumbing Services Ltd | Construction | 2020 |
| Apex Home Developments Ltd | Construction | 2023 |
| Apex Informatics Ltd | Professional & scientific | 2021 |
| Apex Plumbing & Heating Southwest Ltd. | Construction | 2023 |
| Apico (Plymouth) Limited | Households | 2008 |
| APN Creative Services Limited | Arts & recreation | 2016 |
| Apollo Tape Ltd | Wholesale & retail | 2025 |
| Aporia Consulting Limited | Professional & scientific | 2007 |
| App Rentals Limited | Real estate | 2019 |
| Apples and Pears Property Care Ltd | Construction | 2022 |
| Appliance Doctor South West Limited | Manufacturing | 2015 |
| Appliances & Furniture 2 Go Limited | Wholesale & retail | 2025 |
| Applied Automation (Holdings) Limited | Financial services | 2017 |
| Applied Automation (UK) Limited | Manufacturing | 1990 |
| Applied Automation Limited | Manufacturing | 2013 |
| Applied Parametric Ltd | Professional & scientific | 2024 |
| Applied Tube Technology Limited | Administrative & support | 2010 |
| Apply 4 UK Visa Ltd | Other services | 2022 |
| Apply Malta.Com Edutech Ltd | Information & communication | 2023 |
| Appreciating Art Limited | Wholesale & retail | 2026 |
| Approved EV Private Hire Ltd | Transport & logistics | 2025 |
| Approved Licensed Vehicles Ltd | Administrative & support | 2023 |
| April Media Productions Ltd | Information & communication | 2010 |
| APS Cleaning Ltd | Administrative & support | 2021 |
| APS Cost Consultancy Limited | Professional & scientific | 2011 |
| APS Property Plymouth Ltd | Construction | 2023 |
| Apwm Limited | Administrative & support | 2025 |
| Aqua Blue-Dolphin Services Ltd | Professional & scientific | 2006 |
| Aqua Kitchen Solutions Ltd | Wholesale & retail | 2007 |
| Aquacross Limited | Households | 1997 |
| Aquaglow Limited | Real estate | 2003 |
| Aqualution Limited | Manufacturing | 2026 |
| Aquanauts Limited | Wholesale & retail | 2003 |
| Aquaspirit Leisure UK Limited | Wholesale & retail | 2021 |
| Aquila Property Management Ltd | Real estate | 2026 |
| Aquila Reporting Limited | Health & social care | 2019 |
| Aquilam Group Ltd | Financial services | 2019 |
| Aquilam House Limited | Real estate | 2025 |
| AR Carpet an Flooring Ltd | Construction | 2026 |
| AR Carpet and Flooring Specialists Limited | Construction | 2024 |
| AR Home Improvements Ltd | Construction | 2018 |
| AR Properties & Son's Ltd | Hospitality | 2020 |
| ARA PL Ltd | Wholesale & retail | 2025 |
| Arasfoodfestivals Ltd | Hospitality | 2024 |
| Arborcure Building Maintenance Limited | Construction | 2025 |
| Arborcure Holdings Limited | Financial services | 2021 |
| Arborcure Limited | Agriculture & fishing | 2013 |
| Arborcure Plant Ltd | Administrative & support | 2021 |
| ARC Metalcraft Limited | Manufacturing | 2003 |
| ARC RT Limited | Administrative & support | 2016 |
| ARC South West Limited | Construction | 2018 |
| Arc-Led Limited | Manufacturing | 2020 |
| Arca (Plymouth) Limited | Arts & recreation | 2019 |
| Arca House Accountancy Services Limited | Professional & scientific | 2010 |
| Arcadia DP Ltd | Professional & scientific | 2003 |
| Arch Fire Systems Ltd | Administrative & support | 2022 |
| Archer Asset & Capital Management Ltd | Financial services | 2021 |
| Archery Assault Ltd | Health & social care | 2016 |
| Archimon Ltd | Professional & scientific | 2025 |
| Archipelago Capital Limited | Financial services | 2023 |
| Archisafe Limited | Transport & logistics | 1987 |
| Architecture Z Ltd | Information & communication | 2025 |
| Archopal I Limited | Professional & scientific | 2024 |
| Archopal Ltd | Financial services | 2023 |
| Arcs Recovery Limited | Health & social care | 2023 |
| Arctifex Studio Ltd | Wholesale & retail | 2025 |
| Ardand Ltd | Transport & logistics | 2018 |
| Ardeidae Group Ltd | Information & communication | 2022 |
| Ardeidae Software Studios Ltd | Information & communication | 2022 |
| Arden Silver Ltd | Extraterritorial | 2015 |
| Ardenrow Capital Limited | Professional & scientific | 2025 |
| Ardent Carpentry Ltd. | Professional & scientific | 2014 |
| Areeko UK Ltd | Wholesale & retail | 2023 |
| Arena International Limited | Wholesale & retail | 2024 |
| Aretha Ltd | Health & social care | 2022 |
| Aretro Limited | Wholesale & retail | 2014 |
| Argans Limited | Professional & scientific | 2007 |
| Argento Jewellery Ltd | Wholesale & retail | 2012 |
| Argentum Property Consultants Limited | Real estate | 2025 |
| Arghantel Group Ltd | Construction | 2026 |
| Argyle Decorators Limited | Construction | 2024 |
| Argyle Pride Group CIC | Education | 2023 |
| Ariana Cleaning Services Ltd | Administrative & support | 2024 |
| Arielle Louise Aesthetics Ltd | Health & social care | 2023 |
| ARJ CRE8 Limited | Manufacturing | 2014 |
| ARJ Utilities Ltd | Energy | 2021 |
| ARK Valley Ltd | Wholesale & retail | 2019 |
| Arkad Properties Limited | Real estate | 2015 |