| Aller Langport Solar Park Limited | Energy | 2013 |
| Allpools and Spas Ltd | Wholesale & retail | 2003 |
| Altcheese Ltd | Manufacturing | 2021 |
| Amberley House (Clifton) Management Company Limited | Real estate | 2005 |
| Amberwood House Management Limited | Households | 1982 |
| Amulet Engineering Ltd | Construction | 2026 |
| Anamed Ltd | Health & social care | 2016 |
| Anderson Green Partners Ltd | Professional & scientific | 2012 |
| Andra 94 Ltd | Health & social care | 2019 |
| Andrem Medical Ltd | Health & social care | 2025 |
| Andromache Holding Ltd | Other services | 2020 |
| Andy Cole Limited | Construction | 2003 |
| Anglo Dutch Trading Ltd | Wholesale & retail | 2020 |
| Anglo-Trading Estate Limited | Real estate | 1947 |
| Anqa Limited | Real estate | 2019 |
| Apel (Packaging Division) Ltd | Wholesale & retail | 1991 |
| Apex Plates UK Ltd | Wholesale & retail | 2026 |
| Apexx Digital Ltd | Information & communication | 2017 |
| Apple Pubs Ltd | Hospitality | 2022 |
| Appleton Lets Ltd | Real estate | 2016 |
| April People Ltd | Professional & scientific | 2019 |
| APT Payroll Services Ltd | Professional & scientific | 2025 |
| Aquamain (UK) Limited | Construction | 2004 |
| Arcadia Accountancy Limited | Professional & scientific | 2012 |
| Arden Healthcare (Distribution) Management Limited | Wholesale & retail | 1998 |
| Arizona House Management Bath Limited | Real estate | 2020 |
| Arizona Investments Limited | Real estate | 1998 |
| Arlington House Management Company Limited | Extraterritorial | 1991 |
| Artdateuk Ltd | Extraterritorial | 2021 |
| Arteya Limited | Information & communication | 2019 |
| Artisawn Ltd | Manufacturing | 2024 |
| Ashcombe Homes Limited | Construction | 1987 |
| Aspect Nubuild Limited | Construction | 2015 |
| Association of Show and Agricultural Organisations | Administrative & support | 1992 |
| Asymptotix Ltd | Information & communication | 2012 |
| ATF Hire Ltd | Manufacturing | 2018 |
| Athena Holidays Ltd | Administrative & support | 2025 |
| Atlas Formations Limited | Administrative & support | 2020 |
| Aurora Kusina Catering Ltd | Hospitality | 2022 |
| Aurora Kusina Ltd | Hospitality | 2022 |
| Avalon Elastomers Limited | Wholesale & retail | 2012 |
| Avalon Renewables Limited | Construction | 2026 |
| Axand Limited | Real estate | 2016 |
| Axolve Limited | Real estate | 1990 |
| Ayton Enterprise Limited | Arts & recreation | 2021 |
| Ayton Franchise Limited | Professional & scientific | 2007 |
| Ayton Global Research Limited | Professional & scientific | 2004 |
| B J Campbell Investments (Cheddar) Limited | Construction | 2025 |
| B J Campbell Property Limited | Construction | 2020 |
| Bacchanalia Production Limited | Administrative & support | 2025 |
| Back ROW Investments Limited | Construction | 2015 |
| Bagborough LLP | | 2009 |
| Balanced Success Investments Ltd | Wholesale & retail | 2026 |
| Baltonsborough Properties Limited | Real estate | 2011 |
| Banham & Barnes Surveying Ltd | Professional & scientific | 2026 |
| Bar Techs Cellar Services Ltd | Administrative & support | 2021 |
| Barbery Limited | Manufacturing | 2004 |
| Barnsdale Road Renewables Limited | Energy | 2024 |
| Barrington Logistical Services Limited | Transport & logistics | 2011 |
| Barter Transport Ltd | Transport & logistics | 2020 |
| Base Capture Limited | Information & communication | 2026 |
| Basswood Court Management Ltd | Households | 2022 |
| Bath & Bristol Carpentry Ltd | Manufacturing | 2023 |
| Bath and West Estates Management Company Limited | Real estate | 2017 |
| Bath and West Shows Limited | Arts & recreation | 2013 |
| Bath CI Limited | Information & communication | 2004 |
| Baxter Creative Limited | Professional & scientific | 2019 |
| Baxterconstruction(Sw) Ltd | Construction | 2019 |
| Bctestingsolutions Ltd | Professional & scientific | 2026 |
| Beans and Machines Espresso Services Ltd | Hospitality | 2015 |
| Beaufort Court (Clifton) Management Limited | Households | 1977 |
| Beaumont House (Management) Limited | Households | 1981 |
| Beggars Boost Limited | Hospitality | 2021 |
| Beleznai Ltd | Public administration | 2020 |
| Belgian Limited | Professional & scientific | 2017 |
| Bella SM Ltd | Hospitality | 2024 |
| Belle Court (Totterdown) Management Company Limited | Households | 1992 |
| BEN Henry Limited | Administrative & support | 2014 |
| BEN Hewitt Creative Ltd | Professional & scientific | 2020 |
| BEN Meader Aggregate and Haulage Ltd | Transport & logistics | 2024 |
| Berden Solar Limited | Energy | 2017 |
| Best Esthetics UK Ltd | Wholesale & retail | 2020 |
| Betaorange Limited | Wholesale & retail | 1968 |
| Beyond Loneliness Community Interest Company | Other services | 2023 |
| BGW Law Limited | Professional & scientific | 2015 |
| BGW Law Property Ltd | Real estate | 2020 |
| BI Automotive Ltd | Wholesale & retail | 2026 |
| Bilbrook Renewables Limited | Energy | 2025 |
| Biosci Consulting Ltd | Professional & scientific | 2019 |
| Biosci Limited | Professional & scientific | 2011 |
| Bird and Beak Limited | Wholesale & retail | 2024 |
| Bistro Catering Ltd | Hospitality | 2021 |
| Bite the Apple CIC | Arts & recreation | 2025 |
| Bizy Construction Group Ltd | Professional & scientific | 2022 |
| Bizy Home Investment Ltd | Construction | 2023 |
| BJ Dearden Production Ltd | Information & communication | 2014 |
| BKN Holdings Ltd | Financial services | 2025 |
| Black BEE Honey Limited | Manufacturing | 2017 |
| Black Ice Retail Ltd | Wholesale & retail | 2025 |
| Black Sheep Events CIC | Administrative & support | 2023 |