| B & K Homes Limited | Real estate | 2019 |
| B Bayley Limited | Professional & scientific | 2025 |
| B&M Consulting Group Limited | Professional & scientific | 2022 |
| B&W Enterprise Ltd | Real estate | 2026 |
| B&W Recruitment Limited | Administrative & support | 2016 |
| B&W Truck School Ltd | Education | 2019 |
| B.J. Barkwell & Sons Limited | Hospitality | 1995 |
| B.P. Whale Limited | Administrative & support | 2003 |
| BAC Collective Ltd | Wholesale & retail | 2018 |
| Bacchus Concierge Ltd | Manufacturing | 2020 |
| Balanced Solutions Ltd | Extraterritorial | 2024 |
| Ballooning Access Ltd | Transport & logistics | 2024 |
| Baloo's (Trowbridge) Ltd | Arts & recreation | 2016 |
| Banner (North) Limited | Wholesale & retail | 1999 |
| Banner Holdings Limited | Wholesale & retail | 2016 |
| Banner Limited | Wholesale & retail | 2010 |
| Banwell Holdings Limited | Real estate | 2025 |
| Baraka Residence Ltd | Real estate | 2026 |
| Barber Land Ltd | Other services | 2018 |
| Barlow Consulting Limited | Information & communication | 2015 |
| Barthe Safety Limited | Professional & scientific | 2022 |
| Basandrai Group Ltd | Financial services | 2021 |
| Basandrai Longwell Limited | Hospitality | 2024 |
| Basandrai Outlet Limited | Hospitality | 2024 |
| Basandrai Properties Limited | Real estate | 2021 |
| Basic Paye Ltd | Professional & scientific | 2025 |
| Bath & West Fire & Safety Ltd | Public administration | 2019 |
| Bath Air Conditioning Ltd | Construction | 2021 |
| Bath City Joinery Limited | Manufacturing | 2012 |
| Bath Design Ltd | Construction | 2019 |
| Bath Domestic Appliances Limited | Wholesale & retail | 2012 |
| Bath Garden Design Ltd | Administrative & support | 2016 |
| Bath Rock Media Limited | Information & communication | 2006 |
| Bath Taxis Limited | Transport & logistics | 2005 |
| Bathroom Cabinets Limited | Wholesale & retail | 2013 |
| Batstone Restoration Roofing Limited | Construction | 2018 |
| Bbffc Limited | Arts & recreation | 2010 |
| Bbthd Ltd | Real estate | 2025 |
| Bbthm Ltd | Construction | 2018 |
| BC Admin & Marketing Ltd | Financial services | 2026 |
| BCW Solutions Limited | Information & communication | 2024 |
| BDI Inc Ltd | Real estate | 2020 |
| BE. Beauty Aesthetics Ltd | Other services | 2025 |
| Bear Original Ltd | Construction | 2024 |
| Beaumont (Bath) Ltd | Construction | 2021 |
| Beauty Full - Time Limited | Wholesale & retail | 2014 |
| Beaven Property Limited | Real estate | 2018 |
| Beaver and Tapley Limited | Manufacturing | 2011 |
| Becks Mill (Westbury) Limited | Households | 2006 |
| Beechwood House Conigre Limited | Households | 2024 |
| Beechwood Tree Surgeons Limited | Administrative & support | 2016 |
| Beer and Beaches Limited | Real estate | 2021 |
| Behind the Lens Ltd | Information & communication | 2023 |
| Belicista Ltd | Professional & scientific | 2012 |
| Believing in Different Limited | Education | 2017 |
| Bella’S Ballerinas Limited | Arts & recreation | 2024 |
| Bellefield House Management Company Limited | Real estate | 2007 |
| BEN Perkins Ltd | Construction | 2011 |
| BEN Rule Limited | Wholesale & retail | 2021 |
| BEN Sheppard Carpets Limited | Construction | 2023 |
| Bendac Labs Limited | Manufacturing | 2021 |
| Bennett Associates Consulting Limited | Construction | 1999 |
| Berryfield Farm Consulting Ltd | Professional & scientific | 2016 |
| Best Cleaning Group Ltd | Administrative & support | 2021 |
| Best Frame Ltd | Construction | 2022 |
| Best Healthcare Consultancy Ltd | Administrative & support | 2016 |
| Best Property Investments Ltd | Real estate | 2024 |
| Best Recruitment Ltd | Administrative & support | 2022 |
| Bhardwaj Transport Ltd | Transport & logistics | 2026 |
| BHJ Accounting Ltd | Professional & scientific | 2017 |
| Bhon Tatha Ltd | Professional & scientific | 2023 |
| Big BEN Books Ltd | Wholesale & retail | 2017 |
| Big Red Ventures Ltd | Real estate | 2024 |
| Billionhairs Barbershop Ltd | Other services | 2021 |
| Binx Health Limited | Professional & scientific | 2005 |
| BIO Works Ltd | Manufacturing | 2022 |
| Biohumus Organic Products & Machinery Ltd | Wholesale & retail | 2016 |
| Bioneer Limited | Information & communication | 2021 |
| Birdhouse Wiltshire Ltd | Hospitality | 2026 |
| Birkett Building Consultancy Ltd | Professional & scientific | 2025 |
| Bisous Creative Ltd | Professional & scientific | 2026 |
| BK Decorators Ltd | Construction | 2013 |
| BK Electrical Contractors Ltd | Construction | 2014 |
| BK Property and Maintenance Ltd | Households | 2024 |
| Black Penny Pickups Ltd | Extraterritorial | 2024 |
| Blackjackbrix Ltd | Wholesale & retail | 2025 |
| Blanchard Solutions Limited | Wholesale & retail | 2023 |
| Blao Plant Ltd | Wholesale & retail | 2025 |
| BLB Solicitors Holdings Limited | Financial services | 2022 |
| Bletso Ltd | Professional & scientific | 2014 |
| Blitz Magazine Ltd | Information & communication | 2021 |
| Blokkies Ltd | Manufacturing | 2025 |
| Blood Yell Limited | Professional & scientific | 2018 |
| Blue Compass Homes Ltd | Real estate | 2023 |
| Blue Compass Properties Ltd | Households | 2023 |
| Blue MAX Banner Limited | Wholesale & retail | 2016 |
| Blue MAX Group Limited | Wholesale & retail | 1988 |
| Blue MAX Limited | Other services | 1987 |
| Blue Planet Holdings Ltd | Manufacturing | 2023 |
| Blue Sky Enabling Limited | Health & social care | 2013 |