| Breeze Boat Maintenance Limited | Manufacturing | 2015 |
| Brett Barber Flying Ltd | Transport & logistics | 2022 |
| Brew/Grind Ltd | Wholesale & retail | 2023 |
| Brian Harris Limited | Professional & scientific | 1960 |
| Briar Bakery Ltd | Wholesale & retail | 2011 |
| Bridal Beauty Devon Ltd | Wholesale & retail | 2022 |
| Bridge & Moor Property Ltd | Real estate | 2024 |
| Bridge Croft Management Company (Ashburton, Devon) Limited | Households | 1992 |
| Bridge Terrace Management Company Limited | Real estate | 2000 |
| Brig UK Ltd | Wholesale & retail | 2019 |
| Bright Agricultural Services Limited | Agriculture & fishing | 2026 |
| Bright Hospitality Services Ltd | Hospitality | 2019 |
| Bright Oak Accounting Ltd | Professional & scientific | 2019 |
| Brighter Horizons Devon CIC | Health & social care | 2024 |
| Brightology Ltd | Information & communication | 2018 |
| Brimblecombe Bros. & SON Limited | Construction | 2002 |
| Brintor Group Limited | Financial services | 1999 |
| Britannia Home Refurbishments Limited | Construction | 2015 |
| Brite Services Limited | Administrative & support | 1997 |
| Brix Ventures Ltd | Manufacturing | 2026 |
| Broad Dynamics Consulting Ltd | Information & communication | 2023 |
| Broadsands Development Company Limited | Real estate | 1954 |
| Broforce Engineering Ltd | Professional & scientific | 2026 |
| Bromleigh House Ltd | Information & communication | 2004 |
| Brook Phoenix Limited | Professional & scientific | 2016 |
| Brookmarsh Limited | Hospitality | 2011 |
| Brookside Group Limited | Financial services | 2019 |
| Brookside Restaurant Limited | Hospitality | 2003 |
| Brothwell Irvine (Holdings) Ltd | Financial services | 2024 |
| Brothwell Irvine Limited | Construction | 1999 |
| Brown Brothers Clearances Limited | Transport & logistics | 2023 |
| Brunel Masonry Limited | Construction | 2012 |
| BSP Developers Limited | Construction | 2019 |
| BSP Equipment Hire Limited | Administrative & support | 2022 |
| BT Business Ventures Limited | Information & communication | 2026 |
| BT Floors Limited | Construction | 2024 |
| BT Tyres Plymouth Ltd | Wholesale & retail | 2024 |
| BU Coaching and Training Ltd | Administrative & support | 2017 |
| Buckfast Organic Bakery Limited | Manufacturing | 2003 |
| Buckland Fryer Limited | Hospitality | 2025 |
| Buckleigh Farm & Timber Merchants Limited | Agriculture & fishing | 1995 |
| Buddleford AD Ltd | Financial services | 2025 |
| Buff Natural Body Care Ltd | Health & social care | 2015 |
| Build IT South Devon Limited | Construction | 2025 |
| Building Services Engineering Ltd | Construction | 2019 |
| Buildscape SW Limited | Construction | 2023 |
| Buildwise Building Company Limited | Construction | 2021 |
| Buildwise Properties Limited | Real estate | 2021 |
| Bulan DRY Lining Limited | Construction | 2019 |
| Bulleigh Fabrications Limited | Manufacturing | 2018 |
| Bulletproof Consulting Limited | Public administration | 2024 |
| Bulwark Holdings Ltd | Administrative & support | 2019 |
| Bunberry Limited | Administrative & support | 2002 |
| Burgess & Taylor (Newton Abbot) Ltd | Wholesale & retail | 2013 |
| Burkett and Sons Limited | Real estate | 2024 |
| Burleve Limited | Professional & scientific | 2002 |
| Bushmartin Ltd | Agriculture & fishing | 2025 |
| Bushwhacka STU Ltd | Administrative & support | 2023 |
| Business Space Made Easy Limited | Administrative & support | 2016 |
| Butta Group Ltd | Hospitality | 2026 |
| Butterdon Ltd | Agriculture & fishing | 2021 |
| Buyrite Tyres (Newton Abbot) Limited | Wholesale & retail | 1977 |
| Buyrite Tyres Limited | Wholesale & retail | 2025 |
| Buysigns Limited | Administrative & support | 2005 |
| Buzz Scaffolding Limited | Construction | 2008 |
| BW Commercial Estates Limited | Administrative & support | 2025 |
| BW Plumbing and Heating SW Ltd | Construction | 2023 |
| BY Serendipity Limited | Hospitality | 2021 |
| BY the Unbridled Ltd | Professional & scientific | 2021 |
| C & a Evans Limited | Manufacturing | 2022 |
| C & a Evans Holdings Limited | Financial services | 2026 |
| C & C Medical Ltd | Health & social care | 2019 |
| C & D Peptides Ltd | Wholesale & retail | 2025 |
| C & L (SW) Limited | Wholesale & retail | 2021 |
| C C Products Limited | Hospitality | 2017 |
| C J Hart Limited | Financial services | 2013 |
| C R Tonepohl Plumbing & Heating Limited | Construction | 2012 |
| C R Wood Electrical Limited | Wholesale & retail | 2004 |
| C V & D Ltd | Real estate | 2018 |
| C Ware and SON Limited | Construction | 2021 |
| C&D Paving & Construction Ltd | Construction | 2021 |
| C&M Holdings Devon Ltd | Financial services | 2026 |
| C&W Building Company Limited | Construction | 2019 |
| C. P. Tree Services Limited | Agriculture & fishing | 2015 |
| C.G.Y. (Cornwall) Limited | Construction | 2023 |
| C.G.Y. Holdings Limited | Financial services | 2023 |
| C.K. Mayo Taverns Limited | Real estate | 1964 |
| C.L. RYE Trading Limited | Water & waste | 2000 |
| C.P.T Fuelwood LLP | | 2021 |
| Cabeauty Ltd | Other services | 2021 |
| Cabin Exmouth Limited | Wholesale & retail | 2021 |
| Cabriolet Roof Hoses Ltd | Professional & scientific | 2019 |
| Cactus Commerce Limited | Other services | 2023 |
| CAD Contracts Limited | Information & communication | 1997 |
| Cadboll Holdings Limited | Administrative & support | 2010 |
| Cadence Retail & Leisure Interiors Ltd | Construction | 2014 |
| Cafe 3 Sixty Limited | Hospitality | 2017 |
| Café Cubby Ltd | Hospitality | 2023 |
| Calendarhouse Ltd | Wholesale & retail | 2025 |
| Cali Bear Limited | Real estate | 2017 |