| BEN Crocker Pantomimes Limited | Information & communication | 2014 |
| Bespoke Timber Joinery Limited | Construction | 2019 |
| Best Driver Training Ltd | Education | 2022 |
| Best Wish Limited | Real estate | 2020 |
| Bestridge Management Limited | Households | 2002 |
| Beth Slade Safety Ltd | Public administration | 2025 |
| Better at Home (South West) Ltd Ltd | Construction | 2023 |
| Bettergetdigital Ltd | Information & communication | 2018 |
| Bettersx Limited | Education | 2022 |
| Beyme Ltd | Real estate | 2019 |
| BG Balment Partners Ltd | Other services | 2012 |
| BHP Events Limited | Arts & recreation | 2013 |
| Bickington Residents Parking Spaces Limited | Households | 2022 |
| Bideford Littleham and Westward HO! Cricket Club Limited | Arts & recreation | 2012 |
| Big C Ltd | Manufacturing | 2025 |
| Big Communications Limited | Professional & scientific | 1996 |
| Binge Burger Ltd | Hospitality | 2023 |
| Biosphere Foundation CIC | Professional & scientific | 2021 |
| Biotic Health Clinical Nutrition Ltd | Health & social care | 2021 |
| Birch Meadow Landscaping Limited | Administrative & support | 2020 |
| Birch Tarmacadam Limited | Construction | 2014 |
| Birds Country Products Ltd | Agriculture & fishing | 2019 |
| Bishop Jewellery Limited | Wholesale & retail | 2000 |
| Bishop-Property Limited | Households | 2025 |
| Bishops Printing Limited | Professional & scientific | 2002 |
| Bisu Barn Ltd | Health & social care | 2021 |
| BIT Bash Entertainment Ltd | Arts & recreation | 2025 |
| Bittadon Farms Limited | Agriculture & fishing | 2004 |
| Bitwen Market Ltd | Wholesale & retail | 2025 |
| BK Safety & Workwear Limited | Manufacturing | 2006 |
| Bksafetywear Ltd | Manufacturing | 2016 |
| Bkworkwear Ltd | Manufacturing | 2016 |
| Black Key Trading Ltd | Wholesale & retail | 2019 |
| Black Wall Street London Ltd | Real estate | 2020 |
| Blairgowrie Associates Limited | Professional & scientific | 2011 |
| Blast Away (Holdings) Limited | Financial services | 2019 |
| Blast Away Limited | Administrative & support | 2011 |
| Blast Away Properties Limited | Real estate | 2024 |
| Blck Mrkt Limited | Wholesale & retail | 2022 |
| Bloc Acoustic Art Ltd | Construction | 2019 |
| Blue Box Self Storage and Warehousing Limited | Transport & logistics | 2016 |
| Blue Elephant Childcare Ltd | Health & social care | 2017 |
| Blue Elephant Future Steps CIC | Hospitality | 2024 |
| Blue Horizon (Woolacombe) Limited | Construction | 2023 |
| Blue Waters (Information Services) Limited | Extraterritorial | 2001 |
| Bluebell Lane Publishing House Limited | Wholesale & retail | 1997 |
| Bluefrog Holdings Ltd | Financial services | 2025 |
| Bluewater Waste Management Ltd | Water & waste | 2024 |
| Blugem Communications Limited | Professional & scientific | 2005 |
| BM Mgmt Co Limited | Extraterritorial | 2023 |
| Boards (Bideford) Limited | Households | 2007 |
| Bobblehat Limited | Other services | 2013 |
| Boden Construction Limited | Construction | 2012 |
| Boden Fire & Security (Barnstaple) Limited | Construction | 2014 |
| Boden Fire & Security Limited | Manufacturing | 2009 |
| Boden Group Facilities Limited | Administrative & support | 2012 |
| Boden Holdings Limited | Financial services | 2020 |
| Bond EAR Care Ltd | Health & social care | 2023 |
| Bond Family Homes Ltd | Real estate | 2026 |
| Bonds Aesthetics (Devon) Ltd | Health & social care | 2022 |
| Boofuls Holdings Limited | Financial services | 2024 |
| Boomboom Media Ltd | Professional & scientific | 2015 |
| Boomboom Print & Production Ltd | Professional & scientific | 2018 |
| Bootcamp UK JDS Limited | Other services | 2017 |
| Boss Msport Ltd | Manufacturing | 2021 |
| Bosun Holdings Limited | Hospitality | 2020 |
| Bosveld Ltd. | Manufacturing | 2023 |
| Bound Electrical Services Ltd | Construction | 2025 |
| Boundy (Plymouth) Ltd | Construction | 2024 |
| Boundy Ltd | Construction | 2018 |
| Bounty Creations Ltd | Hospitality | 2025 |
| Bowdens Cleaning Services Limited | Administrative & support | 2018 |
| Bowen Homes Group Limited | Financial services | 2023 |
| Bowen Homes Ltd Limited | Other services | 2005 |
| Brabo Ltd | Professional & scientific | 2006 |
| Brackloch Corporate Services Ltd | Professional & scientific | 2017 |
| Bradiford Properties Limited | Construction | 1991 |
| Braham & Murray Limited | Administrative & support | 2003 |
| Brand Scale Ltd | Professional & scientific | 2012 |
| Branding Warehouse Ltd | Professional & scientific | 2025 |
| Brannam (Barnstaple) Ltd | Real estate | 2024 |
| Brannam Vets Limited | Professional & scientific | 2025 |
| Brannock Properties Limited | Real estate | 2002 |
| Brass Tax Bookkeeping Ltd | Professional & scientific | 2019 |
| Bratton Fleming Village Stores Ltd | Wholesale & retail | 2018 |
| Braunton Car Park Limited | Hospitality | 2025 |
| Braver Women Ltd | Other services | 2021 |
| Bray Leino Limited | Professional & scientific | 1978 |
| Bray Leino Productions Limited | Professional & scientific | 1995 |
| Bray Valley Media Ltd | Information & communication | 2024 |
| Brayford Media Limited | Professional & scientific | 2012 |
| Brayford Real Estate Limited | Real estate | 2016 |
| Brease Accounting Limited | Professional & scientific | 2026 |
| Breath Action Movement Ltd | Arts & recreation | 2023 |
| Breathing Space Activities Limited | Administrative & support | 2004 |
| Breeze Garden Investment Limited | Financial services | 2024 |
| Bremco UK Limited | Manufacturing | 2009 |
| Brew Tang Clan Ltd | Professional & scientific | 2025 |
| Brewer Harding & Rowe Solicitors LLP | | 2013 |
| Bridal Reloved Barnstaple Ltd | Wholesale & retail | 2022 |