| BRZ Holdings Ltd | Construction | 2025 |
| BS West Ltd | Real estate | 2020 |
| BSB Piling & Underpinning Ltd | Construction | 2018 |
| Bsdq.Edu Ltd | Administrative & support | 2026 |
| Bsides Exeter CIC | Administrative & support | 2023 |
| BSN (SW) Limited | Wholesale & retail | 2016 |
| BSN (SW) Property Limited | Construction | 2017 |
| Bsqd Systems Limited | Administrative & support | 2026 |
| Bsurfing Ltd | Arts & recreation | 2019 |
| Bsvb Ltd | Hospitality | 2025 |
| BSW Driveways Limited | Construction | 2026 |
| Btgi Ltd | Professional & scientific | 2025 |
| Bthechange C.I.C. | Other services | 2016 |
| Bthechange Learning & Development Ltd | Education | 2026 |
| BTI Limited | Arts & recreation | 2017 |
| BTL Export Ltd | Wholesale & retail | 2002 |
| BU Property Limited | Real estate | 2026 |
| Bubble Bubble Digital Limited | Other services | 2012 |
| Bubbleliscious Limited | Hospitality | 2020 |
| Bubogo Management Limited | Professional & scientific | 2007 |
| Buchanan Consulting SW Ltd | Financial services | 2017 |
| Buchanan Technology Limited | Information & communication | 2017 |
| Buckburton Healthcare Limited | Wholesale & retail | 2024 |
| Buckley & Co Financial Services Limited | Financial services | 2009 |
| Buckley Plant Hire Limited | Construction | 2003 |
| Buckstone Limited | Financial services | 2024 |
| Budd Land Holdings Limited | Agriculture & fishing | 2023 |
| Buddy CP Ltd | Construction | 2024 |
| Buddy Group Ltd | Education | 2023 |
| Buddys Choice Ltd | Manufacturing | 2026 |
| Budlake Commercials Ltd | Transport & logistics | 2018 |
| Buffett Stonemasonry Limited | Construction | 2009 |
| Build Care Plus Limited | Construction | 2008 |
| Build Consultants Limited | Professional & scientific | 2004 |
| Build Devon Ltd | Construction | 2019 |
| Build IT Love IT Ltd | Information & communication | 2016 |
| Build IT Medical Ltd | Information & communication | 2021 |
| Build SW Ltd | Manufacturing | 2015 |
| Buildclean SW Ltd | Administrative & support | 2025 |
| Builders Inc Ltd | Construction | 2019 |
| Building 101 Limited | Real estate | 2019 |
| Building Devon Ltd | Construction | 2007 |
| Building Management Solutions Devon Limited | Construction | 2006 |
| Building Services Property Limited | Extraterritorial | 2024 |
| Bull & Bear Limited | Administrative & support | 2016 |
| Bullet Ventures Limited | Manufacturing | 2010 |
| Bulwark Homes Limited | Construction | 2023 |
| Bumble Baby Boutique Ltd | Wholesale & retail | 2018 |
| Bundl Clothing Ltd | Wholesale & retail | 2022 |
| Bungalow Lifestyle Ltd | Construction | 2017 |
| Buonokai Limited | Other services | 2017 |
| Burch Property Ltd | Real estate | 2022 |
| Burgundy Wine Language Limited | Other services | 2012 |
| Burlacu Logistics Ltd | Transport & logistics | 2026 |
| Burlawn Farm Amenity Areas Management Company Limited | Households | 2011 |
| Burley Partnership Ltd | Professional & scientific | 2017 |
| Burntbeans Ltd | Manufacturing | 2025 |
| Burrington (ESP NO 1) Management Company Limited | Households | 2021 |
| Burrington Estates (Eurotech House) Limited | Financial services | 2017 |
| Burrington Estates (Exeter Skypark) Limited | Construction | 2020 |
| Burrington Estates CD (Kingskerswell) Ltd | Construction | 2021 |
| Burrow View Property Ltd | Professional & scientific | 2026 |
| Burrs Home Maintenance Ltd | Construction | 2026 |
| Burton Legh Construction Limited | | 1964 |
| Bury Meadow Tennis Club Limited | Arts & recreation | 2005 |
| Business Cost Reduction Associates Limited | Professional & scientific | 2005 |
| Business Management Services (SW) Ltd | Administrative & support | 2024 |
| Business Rates Specialists Ltd. | Professional & scientific | 2012 |
| Business Squared Holdings Limited | Financial services | 2025 |
| Business Squared Limited | Professional & scientific | 2024 |
| Business Treasury Company Limited | Extraterritorial | 2026 |
| Businessfd Limited | Professional & scientific | 2000 |
| Businezexpertz Ltd | Wholesale & retail | 2025 |
| Busy Chaps Ltd | Transport & logistics | 2021 |
| Butchr. Ltd | Wholesale & retail | 2020 |
| Butt Estates Property Ltd | Real estate | 2022 |
| Butt Park Limited | Professional & scientific | 1990 |
| Buy Underfloor Heating Supplies Limited | Wholesale & retail | 2017 |
| Buy With Confidence Ltd | Other services | 2012 |
| Buysoaponline Ltd | Wholesale & retail | 2021 |
| Buzz About Cricket Ltd | Education | 2025 |
| Buzz-D Charging Ltd | Administrative & support | 2026 |
| BV Colour Ltd | Construction | 2015 |
| BV Painting and Decorating Ltd | Construction | 2020 |
| Bvlr Projects Limited | Construction | 2022 |
| BVS Recruitment Ltd | Administrative & support | 2026 |
| BWX Brands UK Ltd | Wholesale & retail | 2016 |
| BY Design Bristol Limited | Real estate | 2025 |
| Byaqua Organics Ltd | Agriculture & fishing | 2017 |
| BYD South West Limited | Wholesale & retail | 2023 |
| Byford Logistics Ltd | Water & waste | 2025 |
| Byron Business Solutions Limited | Professional & scientific | 2018 |
| Byron College Limited | Education | 1992 |
| Byron Plumbing & Heating Limited | Construction | 2003 |
| C & B Mortimer Ltd | Extraterritorial | 2010 |
| C & C Roofing Specialists Limited | Construction | 2022 |
| C & E Properties SW Ltd | Real estate | 2021 |
| C & J Construction Limited | Construction | 2018 |
| C & J Streeter Ltd | Hospitality | 2019 |
| C & K Mobile Milling Services Limited | Agriculture & fishing | 2003 |