| Bell Electrical GL Ltd | Construction | 2025 |
| Bella BE Ltd | Other services | 2018 |
| Bella Christie Jewellery Ltd | Wholesale & retail | 2025 |
| Bellamys Emporium Ltd | Wholesale & retail | 2022 |
| Bellasam Ltd | Real estate | 2023 |
| Bellrise Designs Limited | Real estate | 1990 |
| Bellus CGI Limited | Professional & scientific | 2024 |
| BEN Mace Ltd | Construction | 2015 |
| BEN Mitchell Ltd | Wholesale & retail | 2022 |
| BEN Stevens Decorating Services Ltd | Construction | 2026 |
| Benchwood Limited | Manufacturing | 2011 |
| Bene & Hott Fieldsports Ltd | Wholesale & retail | 2025 |
| Bene & Hott Outdoor Ltd | Wholesale & retail | 2025 |
| Benedict & Company Consultants Limited | Administrative & support | 2014 |
| Benedict & Hott Apparel Ltd | Wholesale & retail | 2025 |
| Benedict & Hott Holding Ltd | Wholesale & retail | 2023 |
| Benson & Hedges Farming Limited | Agriculture & fishing | 2025 |
| Berite (Sawmills) Limited | Manufacturing | 1997 |
| Berkeley Cole Limited | Manufacturing | 2017 |
| Bernard Barker Limited | Information & communication | 2010 |
| Bespoak Interiors Limited | Wholesale & retail | 2015 |
| Bespoke Eyecare Holdings Limited | Wholesale & retail | 2016 |
| Bespoke Plumbing and Heating Services Ltd | Construction | 2023 |
| Bespoke Riding Hats Ltd | Manufacturing | 2003 |
| Bestpricehotdeals Limited | Wholesale & retail | 2009 |
| Beswick Homes (Minchinhampton) Limited | Construction | 2017 |
| Beswick Investments Limited | Real estate | 2025 |
| Beswick Stone (Cirencester) Limited | Construction | 2010 |
| Beswick Stone (Retail) Ltd | Wholesale & retail | 2020 |
| Beswick Stone (Stock) Ltd | Wholesale & retail | 2020 |
| Beswick Warehouse (South Cerney) Ltd | Households | 2019 |
| Beswick Warehouse Limited | Real estate | 2016 |
| Betec Joinery Ltd. | Manufacturing | 1997 |
| Betterbooks Accounting Services Ltd | Professional & scientific | 2024 |
| Beyonderly Ltd | Administrative & support | 2024 |
| BHI Farming Limited | Agriculture & fishing | 2020 |
| Bibury Fine Foods Limited | Wholesale & retail | 2020 |
| Bibury Heritage Limited | Professional & scientific | 2026 |
| Bibury Spring Water Limited | Extraterritorial | 2023 |
| Bickham Limited | Manufacturing | 2023 |
| Big Little Store UK Limited | Wholesale & retail | 2023 |
| Big Red Ltd | Professional & scientific | 2026 |
| Big Red Sales (UK) Limited | Financial services | 2015 |
| Big Three Consulting Limited | Professional & scientific | 2020 |
| Bigfoot Holdings Ltd | Real estate | 2021 |
| Bill Peach Wealth Management Ltd | Extraterritorial | 2012 |
| Bingham Library Trust Limited | Real estate | 2014 |
| Biopfx Ltd. | Professional & scientific | 2016 |
| Bishopstone Homes (Penclawdd) Ltd | Construction | 2006 |
| Bison Plant (Excavation and Plant Hire) Limited | | 1986 |
| BIT by Fit Ltd | Hospitality | 2025 |
| Bitchain Ltd | Professional & scientific | 2024 |
| Bite Coffee Ltd | Hospitality | 2024 |
| Black Trace AA Ltd | Wholesale & retail | 2023 |
| Black Trace Garage Ltd | Wholesale & retail | 2014 |
| Blackwell Mortgages Ltd | Professional & scientific | 2022 |
| Blake Architects Limited | Professional & scientific | 2011 |
| Blenheim Learning Limited | Administrative & support | 2010 |
| Blokland Health Ltd | Health & social care | 2024 |
| Bloody Marvellous Limited | Administrative & support | 2011 |
| Bloomory Limited | Hospitality | 2026 |
| Bloomsbury Boats Limited | Transport & logistics | 2013 |
| Bloomsbury Coin Fair Ltd | Administrative & support | 2011 |
| Blue Castle Computing Ltd | Information & communication | 2014 |
| Blue Dog Limited | Professional & scientific | 2025 |
| Blue Door of York Limited | Real estate | 2006 |
| Blue Poppy Investments Limited | Wholesale & retail | 2024 |
| Blue Puffin Group Ltd | Financial services | 2022 |
| Blue Puffin Stays Ltd | Hospitality | 2021 |
| Blue Resourcing Limited | Professional & scientific | 2005 |
| Blue SAM Limited | Real estate | 2025 |
| Blue Squid Communications Ltd | Professional & scientific | 2024 |
| Bluebell Maintenance Ltd | Construction | 2024 |
| Bluechain Consulting Ltd | Professional & scientific | 2017 |
| Bluespire Interiors Ltd | Professional & scientific | 2022 |
| Blushield UK Limited | Wholesale & retail | 2017 |
| BMF Apprenticeships Plus Ltd | Education | 2016 |
| BMS Panel Works Ltd | Administrative & support | 2018 |
| Boar Investments Limited | Financial services | 2023 |
| Boar Lair Ventures Limited | Information & communication | 2016 |
| Boardroom Cafes Ltd | Wholesale & retail | 2025 |
| Bolton Brow Halifax Freehold 57 Ltd | Real estate | 2026 |
| BOO (Cirencester) Limited | Other services | 2009 |
| BOO Homes (ST Mawes) Ltd | Construction | 2022 |
| BOO Homes Investments Limited | Real estate | 2017 |
| Bord Tech Limited | Information & communication | 2024 |
| Bork Eppers Dressage Ltd | Agriculture & fishing | 2020 |
| Born Wild Tea Limited | Wholesale & retail | 2017 |
| Born-Brands International Ltd | Extraterritorial | 2020 |
| Bosworth Books Limited | Information & communication | 1995 |
| Bouchel Limited | Professional & scientific | 2016 |
| Bourchier Limited | Information & communication | 2010 |
| BOW Acre Limited | Real estate | 2018 |
| BOW Acre Property Limited | Professional & scientific | 2017 |
| Bowerland Holdings Limited | Financial services | 2022 |
| Boyle & Grimes Land and Property Specialists LLP | | 2005 |
| BP Building Ltd | Manufacturing | 2024 |
| BPF Recycling Council Limited | Professional & scientific | 2000 |
| Bradvine Holdings Limited | Financial services | 2019 |
| Bradvine Limited | Agriculture & fishing | 2001 |