| B (Bath) Ltd | Other services | 2016 |
| B Clutch Repair & Services Limited | Wholesale & retail | 2026 |
| B D Burton Group Ltd | Financial services | 2020 |
| B Kemball-Smith Limited | Health & social care | 2015 |
| B O D Properties Limited | Administrative & support | 1999 |
| B Property Rentals Ltd | Real estate | 2025 |
| B Squared Coffee Ltd | Hospitality | 2020 |
| B Sushi Ltd | Hospitality | 2021 |
| B&A Pathology Consultancy Ltd | Education | 2012 |
| B&Nes Parent Carer Forum CIC | Information & communication | 2023 |
| B.C.East Ltd | Wholesale & retail | 2025 |
| BA1 Hair Limited | Other services | 2006 |
| BA2 (Nominees) Ltd | Professional & scientific | 2017 |
| BA2 5RN Ltd | Real estate | 2017 |
| BA2 Cars and Recovery Limited | Wholesale & retail | 2024 |
| BA2 Consultancy Ltd | Professional & scientific | 2012 |
| BA2 Ltd | Real estate | 1988 |
| BA2 Tyres Ltd | Wholesale & retail | 2018 |
| Baby Hub Club C.I.C. | Other services | 2025 |
| Babyblooms Limited | Wholesale & retail | 2005 |
| Background Productions Limited | Arts & recreation | 2021 |
| Bactery Ltd | Professional & scientific | 2023 |
| Baden House Ltd | Households | 2019 |
| Baed Natural Body Care Ltd | Manufacturing | 2022 |
| Baffled Coffee Limited | Hospitality | 2016 |
| Bagherian & Smith Investment Properties Ltd | Real estate | 2024 |
| BAH Pharm Ltd | Administrative & support | 2019 |
| Bailbrook Lane (Bath) Management Company Limited | Households | 2008 |
| Bailbrook Lane (Batheaston) Management Company Limited | Households | 1983 |
| Bailey & Bryant Ltd | Real estate | 2004 |
| Bailey Cook Financial Planning Ltd | Financial services | 2018 |
| Bailhache Education Consulting Ltd | Education | 2024 |
| Bajc Consulting Limited | Professional & scientific | 2025 |
| Baker and Bloom Limited | Wholesale & retail | 2019 |
| Baker Plant Services Ltd | Manufacturing | 2023 |
| Bakers of Bath Limited | Manufacturing | 2002 |
| Baku Electrical Ltd | Construction | 2026 |
| Balance Accounts Limited | Professional & scientific | 2011 |
| Balance Advisors Limited | Administrative & support | 2008 |
| Baldesan Research Ltd | Other services | 2013 |
| Baldrian Holdings Limited | Real estate | 2023 |
| Baldwin Chambers Management Company Limited | Households | 2004 |
| Ballistic Intelligence Limited | Manufacturing | 2025 |
| Balls of Bath Ltd. | Real estate | 2015 |
| BAM Innovation Ltd | Professional & scientific | 2021 |
| Bamboo Garden Chinese Takeaway Ltd | Hospitality | 2024 |
| Bamboo Panda Ltd | Financial services | 2015 |
| Bamg Consultancy Limited | Professional & scientific | 2025 |
| Banana Power Limited | Information & communication | 2013 |
| Banes PUB Co Ltd | Hospitality | 2020 |
| Bang on Prints Limited | Manufacturing | 2022 |
| Bangies Ltd | Hospitality | 2026 |
| Bangkok Express Bath Ltd | Hospitality | 2025 |
| Bank Bristol Ltd | Hospitality | 2020 |
| Bankk Insider Threat Protection Limited | Information & communication | 2018 |
| Bankside Communications Limited | Professional & scientific | 2022 |
| Bannau Wealth Limited | Professional & scientific | 2024 |
| Bannerdown Ltd | Professional & scientific | 2015 |
| Banthon Oriental Limited | Hospitality | 2023 |
| Banwell House Property Limited | Real estate | 2018 |
| Banwell House PUB Company Limited | Hospitality | 2010 |
| Baps ‘N’ That Limited | Hospitality | 2022 |
| Bar & Good Food Limited | Hospitality | 2019 |
| Bar Voyage Ltd | Wholesale & retail | 2023 |
| Barbara Ammar Bespoke and Tailoring Services Ltd | Other services | 2021 |
| Barbirolli Bars (Manchester) Ltd | Hospitality | 2026 |
| Barcroft Media Limited | Extraterritorial | 2003 |
| Barefoot Associates Ltd | Administrative & support | 2015 |
| Barham Consultancy Limited | Professional & scientific | 2022 |
| Barleygreen Limited | Construction | 2018 |
| Barleysheaf Consultants Limited | Professional & scientific | 2025 |
| Barn to Bouquet Ltd | Wholesale & retail | 2023 |
| Barnaby Crescent Limited | Real estate | 2024 |
| Barndance Films Limited | Information & communication | 2026 |
| Barnes and King Limited | Real estate | 2025 |
| Barney Walker Limited | Extraterritorial | 2001 |
| Barnstaple Estate Properties Limited | Real estate | 2003 |
| Barracuda Swimming Ltd | Education | 2014 |
| Barrico Ltd | Manufacturing | 2025 |
| Barrie Weaver Design Limited | Professional & scientific | 1998 |
| Barron Heights Limited | Real estate | 2014 |
| Barrow Renovations Ltd | Construction | 2024 |
| Barryroe Holdings Unlimited | Financial services | 2019 |
| Barton Street Wine Bar Cafe Limited | Hospitality | 2015 |
| Base Location Limited | Administrative & support | 2008 |
| Basis Capital Ltd | Financial services | 2024 |
| Baskerville School of Gymnastics | Arts & recreation | 2009 |
| Baskerville`S Health and Fitness Limited | Arts & recreation | 2009 |
| Baskethead Ltd | Professional & scientific | 2025 |
| Bassett Holywell Ltd | Real estate | 2022 |
| Bassett Land Limited | Real estate | 2017 |
| Bassline Cinema Ltd | Information & communication | 2025 |
| Batewood Renovations Ltd | Manufacturing | 2022 |
| Bath & Avon EAR Care Ltd | Health & social care | 2020 |
| Bath & District Citizens Advice Bureau | Health & social care | 1993 |
| Bath & North East Somerset Carers Centre | Health & social care | 1996 |
| Bath & Wessex Neuro-Physiotherapy Clinic Ltd | Health & social care | 2015 |
| Bath & West Accountants Limited | Professional & scientific | 2003 |
| Bath & West Technical Services Ltd | Information & communication | 2012 |
| Bath & West Wealth Management Ltd | Financial services | 2020 |