| Adrian Pett Limited | Construction | 2017 |
| ADS Agricultural Contractors Limited | Agriculture & fishing | 2025 |
| Advanced Scaffolding (Southwest) Limited | Construction | 2003 |
| Adventure Base Limited | Administrative & support | 2008 |
| Advice Bureau Plus Limited | Administrative & support | 2009 |
| AE Plumbing Property Renovations & Management Ltd | Construction | 2019 |
| Aero Stanrew Group Limited | Professional & scientific | 2011 |
| Aero Stanrew Limited | Manufacturing | 1949 |
| Aerovue UAV Limited | Professional & scientific | 2014 |
| Aethara Ltd | Information & communication | 2021 |
| AFS Hospitality Ltd | Hospitality | 2026 |
| Agapeuk Ltd | Financial services | 2024 |
| Agemo Furniture Ltd | Other services | 2019 |
| Agent November Ltd | Arts & recreation | 2015 |
| Agripipes Ltd | Manufacturing | 2021 |
| Agvice Ltd | Professional & scientific | 2016 |
| AH Sons Ltd | Construction | 2018 |
| Aheadmg Limited | Professional & scientific | 2010 |
| AHG Design & Trading Limited | Professional & scientific | 2021 |
| AHN Surveyors Limited | Administrative & support | 2022 |
| AI Systems Hub Limited | Information & communication | 2024 |
| Air Extreme Ltd | Arts & recreation | 2016 |
| AJH Property Lettings Ltd | Real estate | 2024 |
| AJT Carpentry Services Limited | Manufacturing | 2015 |
| Alan White's Haulage Ltd | Transport & logistics | 2016 |
| Alban Investco Limited | Financial services | 2024 |
| Alby & Stone Devon Ltd | Wholesale & retail | 2025 |
| Alexander Rhind Photography Limited | Professional & scientific | 2017 |
| Algo Consulting Ltd | Professional & scientific | 2009 |
| Alignment Creation Enterprises | Administrative & support | 2019 |
| Alistair James Holdings Ltd | Construction | 2025 |
| ALL Round General Maintenance Ltd | Administrative & support | 2006 |
| ALL Things Waste Ltd | Water & waste | 2026 |
| Alliance Group International (UK) Limited | Extraterritorial | 2015 |
| Allix Ltd | Manufacturing | 2026 |
| Allpests Pest Control Ltd | Administrative & support | 2014 |
| Allsmart Auto Repairs Limited | Wholesale & retail | 2010 |
| Allthingshealthy.Co.Uk - Ltd | Wholesale & retail | 2025 |
| Alphabet Electronic Components Limited | Manufacturing | 1980 |
| Alpine - Coast Limited | Wholesale & retail | 2025 |
| Alscott Management Company Limited | Water & waste | 1997 |
| Alumitech Limited | Construction | 2016 |
| Alykat Charters and Images Limited | Information & communication | 2003 |
| AMB Contractors Limited | Administrative & support | 2001 |
| Amicus Aspiring Care Limited | Financial services | 2023 |
| Amicus Supported Living Ltd | Health & social care | 2024 |
| Amigos Worldwide | Other services | 2007 |
| Amigos Worldwide Ventures Limited | Other services | 2015 |
| AMP Roofing Ltd | Construction | 2019 |
| AMY Mckell Ltd | Professional & scientific | 2023 |
| Anchor Court (Sticklepath) Management Ltd | Real estate | 2012 |
| Anchor Mills Residents Association Limited | Administrative & support | 1997 |
| Anchor Property Care & Co Limited | Construction | 2021 |
| Anchorbridge Ltd | Information & communication | 2025 |
| Anderson & Evans Limited | Construction | 2005 |
| Andrew Cotton Surfing Limited | Arts & recreation | 2020 |
| Andrew Dinnicombe Construction Limited | Construction | 2002 |
| Andrew Howe Consulting Ltd | Professional & scientific | 2007 |
| Animal Therapy Solutions Limited | Education | 2015 |
| Anna's ARK Pet Services Limited | Other services | 2019 |
| Anonymous Retouch Ltd | Professional & scientific | 2007 |
| Anoraq Ltd | Wholesale & retail | 2023 |
| Ansdell Farms Limited | Agriculture & fishing | 2008 |
| Anugraha Everest Ltd | Hospitality | 2020 |
| Ap.Rox IT Limited | Information & communication | 2010 |
| APE Industries Co Ltd | Manufacturing | 2018 |
| Apex Developments - Devon Limited | Construction | 2022 |
| Apex Roofing North Devon Limited | Construction | 2019 |
| APH Carpentry (Barnstaple) Ltd | Manufacturing | 2026 |
| Applebeach Group Holdings Limited | Financial services | 2021 |
| Applebeach Limited | Health & social care | 2019 |
| Appledown Property Solutions Ltd | Real estate | 2019 |
| Appointt Ltd | Professional & scientific | 2021 |
| April SIX Proof Ltd. | Administrative & support | 2004 |
| AR Complete Scaffolding Limited | Construction | 2015 |
| Aram Family Holdings Limited | Financial services | 2016 |
| Arcora Ltd | Information & communication | 2026 |
| Ardnax Limited | Administrative & support | 2012 |
| ARE Investments Ltd | Construction | 2012 |
| Argo Life & Legacy Ltd. | Professional & scientific | 2014 |
| Arkstone Construction SW Ltd | Construction | 2025 |
| Arle House (Investment) Limited | Professional & scientific | 2007 |
| Arlington Financial Associates Limited | Financial services | 2018 |
| Arlington Rural Community CIC | Arts & recreation | 2023 |
| Armada Close (Ilfracombe) Management Company Limited | Households | 2019 |
| Armex Investments Limited | Financial services | 2026 |
| Arova Ltd | Construction | 2025 |
| Arrowbuild SW Limited | Construction | 2019 |
| Arscott Care Hub Limited | Health & social care | 2019 |
| Arscott Power Limited | Energy | 2012 |
| Artis TOO Ltd | Hospitality | 2024 |
| Artisarni Food Company Limited | Hospitality | 2019 |
| Arundel House (Barnstaple) Limited | Health & social care | 2003 |
| Arundel Residential Services Limited | Health & social care | 2021 |
| Ascot Architecture Ltd | Professional & scientific | 2024 |
| ASG Mortgages Ltd | Financial services | 2022 |
| Ashbourne Electrical Limited | Construction | 2015 |
| Ashfield House Trade Car Sales Limited | Wholesale & retail | 2026 |
| Ashfield HS Estate Ltd | Real estate | 2019 |
| Ashore Limited | Wholesale & retail | 2006 |