| Andrews Property Holdings SW Limited | Real estate | 2021 |
| Andriesconcepts Ltd | Other services | 2023 |
| Andros Holdings Ltd | Financial services | 2026 |
| Andy and LEO Properties Ltd | Real estate | 2022 |
| Andy Brimicombe Building Services Limited | Construction | 2006 |
| Andy Brimicombe Plant & Building Supplies Limited | Construction | 2006 |
| Andy Oliver Holdings Limited | Financial services | 2023 |
| Andy Salmon.Co Limited | Professional & scientific | 2011 |
| Andydelivery Ltd | Transport & logistics | 2026 |
| Anexploration Ltd | Professional & scientific | 2024 |
| Angels 13 Ltd | Administrative & support | 2016 |
| Anghel Transport Devon Limited | Transport & logistics | 2024 |
| Angovo Enviro Source Limited | Administrative & support | 2024 |
| ANH Group Ltd | Financial services | 2020 |
| ANH Properties Limited | Real estate | 2018 |
| Animal Diagnostics Ltd | Professional & scientific | 2018 |
| Animating Devon CIC | Education | 2025 |
| Animo Collective Group Limited | Professional & scientific | 2022 |
| ANJ Consultants UK Limited | Real estate | 2016 |
| Ankm Ltd | Construction | 2026 |
| Ankoth Productions Ltd | Information & communication | 2023 |
| Ankylo Ltd | Construction | 2025 |
| Anna COX Ltd | Other services | 2013 |
| Anna Gerring Aesthetics Ltd | Other services | 2022 |
| Anna Gidman Wealth Ltd | Financial services | 2024 |
| Anna Krawiel Ltd | Administrative & support | 2025 |
| Annabor Investments Limited | Real estate | 1989 |
| Annies Balloons Ltd | Wholesale & retail | 2024 |
| Annies Stay and Play CIC | Arts & recreation | 2024 |
| Anosike Limited | Other services | 2011 |
| Another Quantum Ltd | Information & communication | 2024 |
| Ansa Usman Limited | Health & social care | 2016 |
| Anson Group ( Holdings ) Ltd | Construction | 2016 |
| Anson Property Limited | Administrative & support | 2005 |
| Anson Property Management Limited | Professional & scientific | 2002 |
| Anstey Financial Planning Limited | Financial services | 2000 |
| Ansum Property Limited | Real estate | 2020 |
| Antech Energy Services Limited | Mining & quarrying | 2025 |
| Antech Holdings Ltd | Mining & quarrying | 2019 |
| Antech Limited | Mining & quarrying | 1994 |
| Antech Oilfield Services Ltd | Mining & quarrying | 2019 |
| Antheus Telecom Limited | Information & communication | 2005 |
| Anthony Cottages (Property Management) Company Limited | Real estate | 2007 |
| Anthony Spencer Dental Laboratory Ltd | Health & social care | 2012 |
| Anthony Taylor Limited | Extraterritorial | 2002 |
| Anthonys Logistics Ltd | Wholesale & retail | 2025 |
| Antler Studios Ltd | Information & communication | 2018 |
| Antony Home Farm LLP | | 2012 |
| Antony Hospitality Holdings Ltd | Hospitality | 2016 |
| ANU Consultants Limited | Professional & scientific | 2013 |
| ANU Devon Ltd | Hospitality | 2024 |
| Anvilmarts Limited | Manufacturing | 1991 |
| Anythink Ltd | Information & communication | 2024 |
| Apda Support Services Ltd | Administrative & support | 2024 |
| Apex Convenience Holdings Ltd | Real estate | 2025 |
| Apex Dawn Limited | Professional & scientific | 2024 |
| Apex Event Structures Ltd | Construction | 2021 |
| Apex Interface Ltd | Wholesale & retail | 2020 |
| Apex Scaffolding (Exeter) Limited | Construction | 1999 |
| Apex Scaffolding (South West) Ltd | Extraterritorial | 2011 |
| Apex Scaffolding Holdings Limited | Construction | 2016 |
| Apex Screw Piles Ltd | Construction | 2026 |
| Apex Services (South West) Limited | Construction | 1990 |
| APF Investments Limited | Professional & scientific | 2021 |
| APG Doors Limited | Construction | 2022 |
| API Communications Ltd | Professional & scientific | 2003 |
| Apisfirst Ltd | Professional & scientific | 2021 |
| Aplus Training (SW) Ltd | Education | 2011 |
| APO (SW) Ltd | Other services | 2022 |
| Apollo Armoury Ltd | Professional & scientific | 2023 |
| Apple Blossom Day Nursery Limited | Health & social care | 2008 |
| Apple Central Taxis (SW) Limited | Transport & logistics | 2014 |
| Apple Conservatories UK Limited | | 2008 |
| Apple Puree Limited | Financial services | 2021 |
| Apple Snacks Ltd | Hospitality | 2021 |
| Appliance Care Ltd | Other services | 2002 |
| Appropriate Scale Ltd | Professional & scientific | 2025 |
| Apps Legal Limited | Professional & scientific | 2018 |
| Apricot LSW Limited | Construction | 2021 |
| AQ Accountants Limited | Professional & scientific | 2017 |
| Aqora Ltd | Hospitality | 2022 |
| Aqua Exeter Limited | Construction | 2025 |
| Aquafish Solutions Limited | Agriculture & fishing | 2007 |
| Aquamare Marine Ltd | Manufacturing | 2009 |
| Aquaplumb Ltd | Construction | 2008 |
| Aquaterra Leisure Ltd | Hospitality | 2024 |
| Aquila Financial Management Limited | Financial services | 2001 |
| Aquila Mmxx Limited | Real estate | 2018 |
| Arabeth Productions Limited | Professional & scientific | 2022 |
| Aral Sea Properties Ltd | Real estate | 2021 |
| Arame Ltd | Real estate | 2021 |
| Arbeia Instrumentation Services Ltd | Professional & scientific | 2024 |
| Arbour Energy Investments Limited | Professional & scientific | 2024 |
| ARC Developments South West Limited | Construction | 2006 |
| ARC Sync Ltd | Information & communication | 2026 |
| Arcadia Softium Ltd | Information & communication | 2024 |
| Arcani Recruitment Agency Limited | Administrative & support | 2023 |
| Arch Plastering & DRY Lining Contractors Ltd | Construction | 2024 |
| Archangel Licensing Limited | Extraterritorial | 2018 |
| Archangel Productions Ltd | Information & communication | 2013 |