| ADB Private Hire Ltd | Transport & logistics | 2025 |
| Adcb Holdings Ltd | Real estate | 2026 |
| Addspace Limited | Administrative & support | 1999 |
| Adflux Media Solutions Ltd | Professional & scientific | 2025 |
| Adhesive Design Limited | Manufacturing | 2010 |
| ADL Construction Southwest Ltd | Construction | 2020 |
| Adrian Parry Ltd | Information & communication | 2017 |
| Adrian Wedlake Residential Lettings & Management Limited | Real estate | 2023 |
| Adtsb Property Limited | Real estate | 2024 |
| Advance Developments Southwest Ltd | Construction | 2025 |
| Advanced Motorcycle Training Limited | Education | 2018 |
| Advanced Service Engineering Ltd | Manufacturing | 2026 |
| Advantage Rentals Limited | Wholesale & retail | 2002 |
| Adventure Sports Limited | Arts & recreation | 2005 |
| ADY (South West) Limited | Other services | 2023 |
| Afman Hospitality LLP | | 2026 |
| After the Party Ltd | Hospitality | 2025 |
| Aftercare Specialist Cleaning Ltd | Administrative & support | 2022 |
| Afternoon Coffee Club Ltd | Wholesale & retail | 2026 |
| AJS Edwards Limited | Information & communication | 2017 |
| AK Innovations Limited | Professional & scientific | 2006 |
| Alan Muckle Limited | Health & social care | 2002 |
| Alandem Consulting Limited | Professional & scientific | 2009 |
| Albany Court (Fishponds) Management Company Limited | Households | 1996 |
| Albert Road Management Company Limited | Households | 2007 |
| Albion House (Management Company) Limited | Households | 1975 |
| Alfaholics Ltd | Professional & scientific | 1999 |
| Alignea Limited | Professional & scientific | 2006 |
| Alivia Nail & Beauty Ltd | Other services | 2016 |
| ALL Nations Trading Worldwide Ltd | Financial services | 2023 |
| Alternative Narratives Ltd | Arts & recreation | 2025 |
| Amberley Financial Services Limited | Financial services | 2020 |
| Amberley House Clevedon Flat Management Company Limited | Households | 1988 |
| AMD Drives Limited | Construction | 2020 |
| Amitec UK Limited | Manufacturing | 2000 |
| AMM Consulting SW Ltd | Construction | 2026 |
| Ampc 1974 Ltd | Real estate | 2022 |
| Amsworth Fashions Limited | Wholesale & retail | 2009 |
| Analysis by Design Ltd | Information & communication | 2011 |
| Anavrin Property Management Company Limited | Households | 2017 |
| Anco Sponsors Limited | Professional & scientific | 2016 |
| Andrew Lillington Plumbing & Heating Ltd | Construction | 2004 |
| Andrews and Lewis Ltd | Administrative & support | 2024 |
| Anglesea House Management Limited | Households | 2010 |
| ANH Viet Ltd | Other services | 2026 |
| Anna O'Neill Consulting Limited | Professional & scientific | 2025 |
| ANT Worldwide Ltd | Financial services | 2023 |
| Apeiron Consultant Surveyors Limited | Professional & scientific | 2025 |
| Apex Specialist Cleaning Ltd | Administrative & support | 2024 |
| APL Homes Limited | Real estate | 2024 |
| Aplh Properties Limited | Real estate | 2022 |
| Apollo Cars Clevedon Ltd | Transport & logistics | 2026 |
| Aquarian Cladding Systems Ltd | Administrative & support | 2007 |
| Aquarian EST Limited | Professional & scientific | 2024 |
| Aquarian Group Limited | Financial services | 2024 |
| Aquarian Holdings Limited | Administrative & support | 2018 |
| Aquarius Wealth UK Limited | Professional & scientific | 2019 |
| AR Maintenance Ltd | Manufacturing | 2023 |
| Arch Care Services Limited | Health & social care | 1999 |
| Archers Management Limited | Households | 1997 |
| Archimage Solutions Limited | Information & communication | 2007 |
| Ardan Consulting Ltd | Professional & scientific | 2014 |
| Ario Limited | Professional & scientific | 2025 |
| Arrow Labs Limited | Professional & scientific | 2013 |
| Art to House Ltd | Professional & scientific | 2020 |
| Artavia Homes Ltd | Construction | 2022 |
| Asev Food Ltd | Hospitality | 2025 |
| ASH Grove Accounting Limited | Professional & scientific | 2024 |
| Ashemantle Ltd | Professional & scientific | 2023 |
| Aspragg Ltd | Extraterritorial | 2016 |
| Associated Technology Services (Energy) Ltd | Other services | 2015 |
| Associated Technology Services Limited | Manufacturing | 1994 |
| Astelia Ltd | Wholesale & retail | 2016 |
| Astute Safety Consulting Ltd | Professional & scientific | 2018 |
| Atkey and Company Limited | Manufacturing | 2009 |
| Atlas Inspection and Welding Services Limited | Professional & scientific | 2024 |
| Attic Attack Limited | Construction | 2022 |
| Audit Cloud Limited | Information & communication | 2018 |
| Auma Actuators Limited | Wholesale & retail | 1971 |
| Aura Optical Systems Europe Limited | Manufacturing | 2012 |
| Auto Keys Limited | Wholesale & retail | 2007 |
| Automatic Industrial Machines Limited | Manufacturing | 1969 |
| Autotek (Clevedon) Limited | Wholesale & retail | 2015 |
| Avantgarde Automotive Mercedes-Benz Specialists Ltd | Wholesale & retail | 2013 |
| Avantgarde Property Services Limited | Real estate | 2018 |
| AVENUE4 LP | | 2019 |
| Averill Court Management Company Limited | Households | 2014 |
| Avon Country Construction Limited | Professional & scientific | 2021 |
| Avon Food Machinery Limited | Manufacturing | 1990 |
| Avril's Fencing & Timber Products Limited | Wholesale & retail | 2013 |
| Azure Blue Technologies Ltd | Information & communication | 2025 |
| B Bliss Jewellery Ltd. | Manufacturing | 2025 |
| B10 Investments Limited | Real estate | 2020 |
| Baby Beans L.P.G Ltd | Health & social care | 2019 |
| Back 2 Front Landscaping Limited | Administrative & support | 2006 |
| Baileyshealthperformance Ltd | Health & social care | 2023 |
| Bains Cohen LLP | | 2007 |
| Bakes and Berries Ltd | Manufacturing | 2025 |
| Bank House Management Limited | Households | 2004 |
| Banwell Property Limited | Real estate | 2023 |