| Brissett Interiors Ltd | Wholesale & retail | 2018 |
| Bristol Channel Fisheries Limited | Agriculture & fishing | 1982 |
| Bristol China Partnership | Professional & scientific | 2013 |
| Bristol Family Care Limited | Health & social care | 2023 |
| Bristol Flat Roofing Ltd | Construction | 2017 |
| Bristol Healthcare Limited | Administrative & support | 2018 |
| Bristol Heritage Homes Limited | Construction | 2018 |
| Bristol Laser Vision Limited | Health & social care | 2010 |
| Bristol Stone Supplies Limited | Extraterritorial | 2014 |
| Britannia Corporate Limited | Construction | 1995 |
| Britannica Mint Limited | Real estate | 2025 |
| Brithubs Ltd | Wholesale & retail | 2020 |
| Brittanniacourt Associates Limited | Professional & scientific | 1991 |
| Broad Meadow (Leonard Stanley) Residents Management Company Limited | Households | 2012 |
| Broad Street Accounting Ltd | Professional & scientific | 2020 |
| Broadcast 1 Ltd | Information & communication | 2023 |
| Broadfields Management Limited | Real estate | 1983 |
| Broadlands Pottery Ltd | Other services | 2016 |
| Broadreach Sales and Marketing Limited | Professional & scientific | 2026 |
| Broadrock Holidays Ltd | Hospitality | 2021 |
| Broadview Materials UK Limited | Wholesale & retail | 2001 |
| Broben Holdings Ltd | Financial services | 2023 |
| Brockshire Holdings Ltd | Real estate | 2024 |
| Brockshire Investments Ltd | Real estate | 2024 |
| Brockshire Property Ltd | Real estate | 2024 |
| Brockworth Cafe Limited | Hospitality | 2016 |
| Brockworth Car Bodywork Repairs Ltd | Wholesale & retail | 2023 |
| Brockworth Link | Health & social care | 2003 |
| Brockworth Trowels Ltd | Construction | 2024 |
| Brogan Bear Limited | Manufacturing | 2020 |
| Brokkr Robotics Limited | Manufacturing | 2023 |
| Brompton & Hyde Management Ltd | Wholesale & retail | 2025 |
| Bromsberrow Sand & Gravel Co. Limited | Mining & quarrying | 1974 |
| Brook House Management (NO 2) Limited | Households | 2020 |
| Brookings Electrical Installations Ltd | Construction | 2020 |
| Brooks and Pointon Construction Ltd | Construction | 2023 |
| Brooks and Pointon Property Ltd | Real estate | 2020 |
| Brooks Machining Ltd | Manufacturing | 2015 |
| Brookthorpe Springs Farm Limited | Construction | 2022 |
| Brookthorppe Heath and Care Training Limited | Health & social care | 2016 |
| Broomfield Care Ltd | Health & social care | 2008 |
| Brother Bear Ltd | Manufacturing | 2026 |
| Brothertons Accountants Ltd | Professional & scientific | 2006 |
| Broughton Outdoor Products Ltd | Administrative & support | 2015 |
| Brown Butter Bakery Ltd | Manufacturing | 2025 |
| Brownley Limited | Information & communication | 2018 |
| Browns Butchers 2025 Limited | Wholesale & retail | 2025 |
| Bro’S Building & Carpentry Ltd | Construction | 2020 |
| Bruce Reihana Ltd | Arts & recreation | 2020 |
| Brummymummy Ltd | Information & communication | 2018 |
| Brunsdon Asset Management Limited | Financial services | 2009 |
| Brunsdon Employee Benefits Limited | Financial services | 2017 |
| Brunswick Homeloans Limited | Financial services | 2005 |
| Bruton Knowles (1862) LLP | | 2017 |
| Bruton Knowles Limited | Real estate | 2020 |
| Brwt Ltd | Health & social care | 2026 |
| Bryan Consulting Ltd | Professional & scientific | 2017 |
| Brynwhitmorehair Ltd | Other services | 2024 |
| BS Honey Bees Limited | Wholesale & retail | 2020 |
| BS26 Ltd | Arts & recreation | 2025 |
| BSC (SW) Limited | Arts & recreation | 2022 |
| Bspoke Lifestyle Ltd | Financial services | 2018 |
| BT Properties and Accommodation Ltd | Real estate | 2024 |
| BTM Developments Limited | Real estate | 1988 |
| BTR Property Investments Ltd | Real estate | 2026 |
| BTS Restaurants Limited | Hospitality | 2017 |
| BTV Plumbing and Heating Services Ltd | Construction | 2024 |
| Bubblebee Industries UK Ltd | Other services | 2018 |
| Bubbles L Limited | Other services | 2019 |
| Bubu Bubble Ltd | Hospitality | 2024 |
| Buckley Solutions Limited | Professional & scientific | 2013 |
| Buddies Childminding Limited | Education | 2023 |
| Buddii Limited | Professional & scientific | 2023 |
| Budget Building Supplies Ltd | Wholesale & retail | 2021 |
| Buildex Construction Ltd | Construction | 2004 |
| Buildflowpro Ltd | Information & communication | 2026 |
| Building Blocks (CW) Ltd | Construction | 2020 |
| Building Creations Stroud Limited | Construction | 2016 |
| Building Restorations Limited | Construction | 2000 |
| Buildings & Beyond Ltd | Real estate | 2020 |
| Buildtec Construction Contractors Ltd | Construction | 2016 |
| Bullingdon Capital LLP | | 2010 |
| Bumpstead & Co Ltd | Information & communication | 2013 |
| Burdus Properties Ltd | Construction | 2020 |
| Burford Young Ltd | Construction | 2017 |
| Burford Young Properties Ltd | Real estate | 2019 |
| Burgerbase Franchise Ltd | Hospitality | 2020 |
| Burnell and Sargent Property Rentals Limited | Hospitality | 2022 |
| Burning Fort Games Ltd | Information & communication | 2026 |
| Burns Heating and GAS Ltd | Construction | 2019 |
| Burnt Media Ltd | Information & communication | 2015 |
| Busicon Ltd | Professional & scientific | 2007 |
| Business Excellence Limited | Professional & scientific | 2002 |
| Business Improvement Experts Ltd | Professional & scientific | 2023 |
| Business Liquidation Limited | Professional & scientific | 2021 |
| BUSINESS365 Limited | Professional & scientific | 2016 |
| Butler Lettings Ltd | Real estate | 2020 |
| Butler Shopfitting Limited | Construction | 2016 |
| Butterflies Beauty Ltd | Other services | 2023 |
| Butterfly Dreams Play Therapy Ltd | Health & social care | 2024 |