| Apothecary Garden Limited | Manufacturing | 2024 |
| Apptif Ltd | Information & communication | 2024 |
| Aqua Systems Winscombe Limited | Construction | 2010 |
| Arancinifamily Ltd | Hospitality | 2025 |
| Aravun Limited | Administrative & support | 2017 |
| Arcania Apothecary Ltd | Manufacturing | 2000 |
| Architectural Design Solutions (South West) Limited | Professional & scientific | 2012 |
| Ardfinnan Consulting Limited | Information & communication | 2015 |
| Arkorn Developments Limited Liability Partnership | | 2005 |
| Armstrong Consulting Services Limited | Professional & scientific | 2022 |
| ARP Lipids Consulting Ltd | Professional & scientific | 2021 |
| Arrigo Consultancy Ltd | Other services | 2011 |
| Arrow Horse Capital Ltd | Administrative & support | 2021 |
| Art Experience Days CIC | Arts & recreation | 2022 |
| Artio Properties Limited | Real estate | 2016 |
| Artistic Plastercraft Limited | Construction | 2003 |
| ASE Courier Services Ltd | Transport & logistics | 2007 |
| Ashdene Llorca Limited | Real estate | 1993 |
| Ashley Court (Easton) Management Company Limited | Households | 2016 |
| Aspinal Homes Limited | Construction | 2015 |
| Athelney Limited | Other services | 2022 |
| AUL Assurance Ltd | Financial services | 2008 |
| AUL Care Ltd | Extraterritorial | 2008 |
| AUL Underwriting Agency Ltd | Financial services | 2006 |
| Automatic Taping Solutions Limited | Construction | 2017 |
| Avalon Mews Silver Street Limited | Households | 2004 |
| Avon Care Homes Limited | Administrative & support | 1999 |
| Avon Oils Limited | Professional & scientific | 1954 |
| Avon Trailer Towbar Centre Limited | Manufacturing | 2013 |
| Avon Urology Limited | Health & social care | 2019 |
| Ayra Events World Ltd | Hospitality | 2025 |
| Aywa Cafes Limited | Hospitality | 2023 |
| B C Technical Services Ltd | Manufacturing | 2014 |
| B R Hodgson Group Limited | Real estate | 1996 |
| B.F.S. (Easton) Limited | Professional & scientific | 2010 |
| B.R Day Groundworks Limited | Construction | 2018 |
| Bagborough Farms Limited | Agriculture & fishing | 1956 |
| Bagi 39 Limited | Hospitality | 2019 |
| Bagi Brothers Properties Ltd | Construction | 2025 |
| Balance Eco Ltd | Professional & scientific | 2015 |
| Balance Fitness and Wellbeing Limited | Other services | 2016 |
| Ballard (Kent) Limited | Real estate | 1975 |
| Barding Ltd | Professional & scientific | 2019 |
| Barrel Top Wagons Ltd | Manufacturing | 2011 |
| Barry Dalton International Logistics Ltd | Transport & logistics | 2026 |
| Bartram Property Holdings Ltd | Real estate | 2024 |
| Base TV Ltd | Information & communication | 2010 |
| Baseless Ltd | Wholesale & retail | 2025 |
| Basil Powell Shoes Limited | Wholesale & retail | 2006 |
| Bath and Wells DBF Services Ltd | Other services | 2020 |
| Bath and Wells Diocesan Board of Finance(The) | Other services | 1915 |
| Bath Slabs Limited | Manufacturing | 2003 |
| BC Technical Holdings Limited | Financial services | 2025 |
| BDC Structural Engineering Ltd | Professional & scientific | 2019 |
| BE Somerset Broadcasts C.I.C. | Information & communication | 2024 |
| Bearsbridge Asset Protection LLP | | 2025 |
| Bearsbridge Estates Limited | Professional & scientific | 2025 |
| Beech Hill House Management Company Limited | Households | 2007 |
| Beese's Riverside Bar Limited | Real estate | 2016 |
| Beeses Limited | Hospitality | 2020 |
| Belmount Equestrian Ltd | Agriculture & fishing | 2023 |
| BEN Carpentry Limited | Construction | 2023 |
| Bere Cider Company Ltd | Hospitality | 2020 |
| Bernies Kitchen Limited | Hospitality | 2023 |
| Bertcarrara Ltd | Professional & scientific | 2015 |
| Beryn Rose Ltd | Professional & scientific | 2021 |
| Beryn Rose Properties Limited | Real estate | 2023 |
| Bespoke Banter Limited | Information & communication | 2014 |
| Beth Nicholas Ltd | Arts & recreation | 2017 |
| Better Power Services Limited | Other services | 2022 |
| Beut Lifestyle Limited | Wholesale & retail | 2026 |
| Beut Ltd | Wholesale & retail | 2013 |
| Bevan Financial Management Ltd | Professional & scientific | 2008 |
| BH Union Street Management Company Limited | Households | 2015 |
| Bike City Limited | Wholesale & retail | 2010 |
| Bike World Ltd | Wholesale & retail | 2021 |
| Billies and Tong Limited | Manufacturing | 2015 |
| Bishop Jones Group Limited | Extraterritorial | 2015 |
| Bishop Jones Limited | Extraterritorial | 2015 |
| Bishops Mews (Wells) Management Company Limited | Households | 2011 |
| Bishops Way Limited | Real estate | 2001 |
| Bisi Care & Respite Ltd | Health & social care | 2021 |
| Blonde Oak Developments Limited | Construction | 2026 |
| Blonde Oak Holdings Limited | Financial services | 2026 |
| Blossom HR Ltd | Professional & scientific | 2021 |
| Blue Halo Homes Limited | Real estate | 2018 |
| Blue IVY Construction Limited | Construction | 2012 |
| Blue Oak Estate Agents Limited | Real estate | 2025 |
| Blue-Sand Electronics Ltd | Professional & scientific | 2024 |
| Bluebell Woods (UK) Limited | Professional & scientific | 2003 |
| Blueskytec ICS Ltd | Extraterritorial | 2018 |
| Blueskytec IOT Ltd | Extraterritorial | 2018 |
| Blueskytec Transport Ltd | Extraterritorial | 2018 |
| Bluestone Housing Limited | Real estate | 2020 |
| BMC Custom Rooms Ltd | Construction | 2025 |
| Bnon Limited | Manufacturing | 2025 |
| Bookrite Bookkeeping and Accountancy Services Limited | Professional & scientific | 2014 |
| Borough Beauty Studio Limited | Other services | 2002 |
| Bowley's Garage Services Limited | Wholesale & retail | 2003 |
| Bown & SON Limited | Agriculture & fishing | 2008 |