| Brian Gowen Stagewright Carpentry Ltd. | Construction | 2011 |
| Brian Hobbs & Sons Limited | Manufacturing | 2015 |
| Brice Property Ltd | Real estate | 2024 |
| Brick & Brush Ltd | Construction | 2020 |
| Brick Box Property Limited | Real estate | 2016 |
| Brickyard Farm Commercial Ltd | Real estate | 2020 |
| Brickyard Farm Ltd | Real estate | 2020 |
| Bricq Advies LLP | | 2018 |
| Bridge Homes and Renovations Ltd | Construction | 2018 |
| Bridge House (Taunton) Limited | Real estate | 1923 |
| Bridge House Somerset Ltd | Manufacturing | 2020 |
| Bridgeman Jacks Limited | Construction | 2010 |
| Bridgemanjacks Nuclear Services Limited | Professional & scientific | 2013 |
| Bridges Holland Limited | Professional & scientific | 2015 |
| Bridgets Farming Ltd | Agriculture & fishing | 2013 |
| Bridgwater Independent Market CIC | Wholesale & retail | 2024 |
| Bridgwater United Football Club Women Limited | Arts & recreation | 2013 |
| Brigantes Agri | Financial services | 2025 |
| Bright (Production Services) Limited | Wholesale & retail | 2005 |
| Bright Future Properties Ltd | Households | 2020 |
| Bright Futures Training & Coaching Limited | Education | 2019 |
| Bright Learning Systems Limited | Education | 2013 |
| Bright Self Storage Group Ltd | Transport & logistics | 2025 |
| Brightframe Ltd | Professional & scientific | 2024 |
| Brimley Holdings Ltd | Real estate | 2021 |
| Brinsea Farm Ltd | Agriculture & fishing | 2015 |
| Brisco Coffee Ltd | Wholesale & retail | 2022 |
| Bristol & Exeter Properties Limited | Real estate | 2019 |
| Bristol & Exeter Public House Limited | Hospitality | 2026 |
| Bristol Asset Intelligence Ltd | Information & communication | 2020 |
| Bristol Cardiac Critical Care Ltd | Health & social care | 2022 |
| Bristol Cargo Centre Limited | Transport & logistics | 2019 |
| Bristol Confectionery Company Limited | Manufacturing | 2012 |
| Bristol Film and Media Limited | Information & communication | 2012 |
| Bristol Thoracic Imaging Limited | Health & social care | 2017 |
| Bristol Travel Limited | Transport & logistics | 2020 |
| Bristol Website Design Ltd | Information & communication | 2024 |
| Brit Care and Recruitment Ltd | Administrative & support | 2026 |
| Brit Life Ltd | Financial services | 2026 |
| Brit Taxi Limited | Transport & logistics | 2025 |
| British Premium Sales Ltd | Wholesale & retail | 2026 |
| BRO Architecture Ltd | Professional & scientific | 2021 |
| Broad Street Property Management Limited | Households | 2023 |
| Broadlands Court Management Company Limited | Households | 1999 |
| Broadleigh Nurseries Limited | Wholesale & retail | 1972 |
| Broadoak Game Farm Ltd | Agriculture & fishing | 2015 |
| Broadoak Sporting Club Ltd | Arts & recreation | 2017 |
| Broadscope Limited | Professional & scientific | 2017 |
| Broadway Bespoke Homes Ltd | Real estate | 2025 |
| Broadway Developments SW Ltd | Construction | 2022 |
| Broadways Farm Shoot Limited | Arts & recreation | 2024 |
| Brock House Day Nursery Limited | Education | 2008 |
| Brocks Farm Ltd | Agriculture & fishing | 2025 |
| Bromes Farm Limited | Agriculture & fishing | 2008 |
| Brompton Buds Limited | Wholesale & retail | 2018 |
| Bronte Bioenergie Holdings Limited | Extraterritorial | 2011 |
| Brook Farm (Penhow) Ltd | Arts & recreation | 2020 |
| Brookfield Management (Exeter) Limited | Households | 2005 |
| Broomfield Park Management Company Limited | Households | 2020 |
| Broughton Landrace Company Limited(The) | Professional & scientific | 1955 |
| Brown Consultants Limited | Information & communication | 1997 |
| Brown Pike Property Ltd | Financial services | 2026 |
| Brown Shutters Farm Airfield Ltd | Arts & recreation | 2016 |
| Brue Holdings Limited | Real estate | 2024 |
| Bruford & Vallance Insurance Services Limited | Financial services | 2002 |
| Brunch Club by Corner Club Limited | Hospitality | 2025 |
| Brunel (South West) Ltd | Professional & scientific | 2013 |
| Brunel Accountancy Group Ltd | Financial services | 2019 |
| Brush & Go Limited | Administrative & support | 2021 |
| Bryan Enticott Associates Limited | Professional & scientific | 2005 |
| Bryan Properties (Woking) Limited | Administrative & support | 2012 |
| Brynley Andrews Associates Ltd | Professional & scientific | 2025 |
| Brynsworthy Body Repairs Ltd | Wholesale & retail | 2012 |
| Bryony Herrod-Taylor Limited | Financial services | 2022 |
| Bryson Enterprises (Leisure) Limited | Professional & scientific | 1973 |
| BS Autos and Diagnostics Limited | Wholesale & retail | 2025 |
| Bssfn | Other services | 2025 |
| BST Industries Ltd | Administrative & support | 2009 |
| BTS 24 Limited | Transport & logistics | 2023 |
| BTS Hair & Beauty Ltd | Other services | 2025 |
| Buckingham House Dental LLP | | 2019 |
| Buckland (Dover) Management Limited | Households | 2023 |
| Budding Music Limited | Information & communication | 1980 |
| Budley & Co Limited | Agriculture & fishing | 2021 |
| Buff Urban Day Spa Limited | Other services | 2007 |
| BUG Creative Limited | Real estate | 2024 |
| Build & Invest Limited | Construction | 2019 |
| Building a Future Ltd | Construction | 2025 |
| Building Claims Services Limited | Financial services | 2003 |
| Building Developments (SW) Limited | Construction | 2025 |
| Bulk Retail Ltd | Wholesale & retail | 2023 |
| Bull and Bloom Ltd | Wholesale & retail | 2026 |
| Bullitt Limited | Information & communication | 2006 |
| Bullsnape Holdings Limited | Financial services | 2023 |
| Bulman's Removals & Storage Ltd | Water & waste | 2019 |
| Bulstrode Technology Limited | Professional & scientific | 1992 |
| Bumpy Lane Limited | Professional & scientific | 2021 |
| Bunched. Ltd | Information & communication | 2026 |
| Buncombes Electrical Services Limited | Construction | 2014 |
| Bunning 2011 LP | | 2011 |