| Bilberry Estates LLP | | 2012 |
| Bilberry Investments Limited | Agriculture & fishing | 2012 |
| Billboard Rentals Ltd | Administrative & support | 2019 |
| BIO Energy Distributions Ltd | Construction | 2018 |
| Birchclay Ltd | Real estate | 2022 |
| Birchin Lane Ltd | Information & communication | 2022 |
| Birdshaven Residents Association Limited | Real estate | 1998 |
| Birnau Advisory Ltd | Administrative & support | 2018 |
| Bishopstone Homes Ltd | Financial services | 2023 |
| Bishopstone Property Ltd | Real estate | 2019 |
| Bitblue Limited | Financial services | 2014 |
| BK Business Services Ltd | Professional & scientific | 2025 |
| BK Links Ltd | Professional & scientific | 2022 |
| BL Management Limited | Professional & scientific | 2005 |
| Black Bear Building Limited | Construction | 2023 |
| Black Dragon Tattoo Studio Limited | Other services | 2014 |
| Black Swan S & L Limited | Professional & scientific | 2023 |
| Blackaton Manor Farm (Widecombe) Limited | Extraterritorial | 2022 |
| Blackaton Manor Farm Limited | Agriculture & fishing | 1975 |
| Blackaton Research Limited | Information & communication | 2013 |
| Blackdog Property Ltd | Real estate | 2018 |
| Blackduckstudios Ltd | Professional & scientific | 2017 |
| Blackened Ltd | Real estate | 2019 |
| Blackler Barton (Farms) Limited | Agriculture & fishing | 2004 |
| Blackridge Business Services Limited | Administrative & support | 2017 |
| Blagdon Barton Flats Management Limited | Extraterritorial | 1992 |
| Blagdon Development Limited | Construction | 2014 |
| Blagdon Holdings Ltd | Real estate | 2022 |
| Blewitt and Partners Limited | Administrative & support | 2008 |
| Bliss Star Limited | Extraterritorial | 2012 |
| Bloom in Chagford Ltd | Other services | 2024 |
| Blossom Health Coaching Ltd | Health & social care | 2024 |
| Bluchip Accommodation Limited | Hospitality | 2019 |
| Blue Anchor Fishing Ltd | Agriculture & fishing | 2026 |
| Blue Crown Holdings Ltd | Financial services | 2024 |
| Blue Crown Homes Ltd | Real estate | 2024 |
| Blue Earth Films Limited | Professional & scientific | 2019 |
| Blue Ocean (SW) Limited | Construction | 2005 |
| Blue Ocean Air Hygiene Ltd | Administrative & support | 2020 |
| Blue Ocean Ventilation Ltd | Wholesale & retail | 2017 |
| Blue Tapir Ltd | Information & communication | 2023 |
| Blue Thunder 68 Limited | Agriculture & fishing | 2024 |
| Blueprint Management Solutions Limited | Professional & scientific | 2004 |
| Blush Ashburton Ltd | Other services | 2019 |
| BM Construction (SW) Ltd | Construction | 2024 |
| BMD Developments Ltd | Construction | 2025 |
| BMD Equine Construction Limited | Construction | 2020 |
| BMD Groundworks & Arenas Limited | Construction | 2017 |
| BMH Asset Management Ltd | Financial services | 2024 |
| BNC Electrical Limited | Construction | 2006 |
| BNKSTRBHB201213 LLP | | 2013 |
| Boathouse Trading Ltd | Construction | 2012 |
| BOB Burch Financial Planning Ltd | Financial services | 2015 |
| Boiler Fault Finder Limited | Information & communication | 2013 |
| Bojago Holdings Limited | Real estate | 2017 |
| Bold Legal Move Limited | Information & communication | 2020 |
| Bold Legal Network Limited | Information & communication | 2010 |
| Bologna Capital Ltd | Professional & scientific | 2023 |
| Bombay Bazaar Giftware Limited | Wholesale & retail | 2017 |
| Bonsai Business Solutions Ltd | Education | 2013 |
| Boo-Chi Limited | Manufacturing | 2017 |
| Book Data Services Limited | Information & communication | 2021 |
| Bookkeeping Matters SW Limited | Professional & scientific | 2024 |
| Booth Enterprises (South West) Limited | Health & social care | 2001 |
| Born Alcohol Free Limited | Manufacturing | 2019 |
| Boro Wood Limited | Agriculture & fishing | 2000 |
| Borohayes Amenity Company Limited | Real estate | 2003 |
| Boss Scaffolding (SW) Limited | Construction | 2016 |
| Bostech Building Services Engineers Ltd | Construction | 2017 |
| Boult Acquisitions Ltd | Financial services | 2025 |
| Bourne Transformations Limited | Construction | 2019 |
| Boutique Stays Limited | Real estate | 2017 |
| Bovey Financial Consultants Limited | Financial services | 2012 |
| Bovey Futures Limited | Public administration | 2017 |
| Bovey Golf Limited | Arts & recreation | 2015 |
| Bovey Larder Ltd | Wholesale & retail | 2020 |
| Bovey Macadam Ltd | Construction | 2016 |
| Bovey Southwest Limited | Transport & logistics | 2003 |
| Bovey Tracey Chiropractic Clinic Limited | Health & social care | 2014 |
| Bovey Tracey Information Centre CIC | Information & communication | 2022 |
| Bowater Homes Ltd | Real estate | 2016 |
| Bowden Green Developments Ltd | Real estate | 2026 |
| Bowden Green Holdings Ltd | Financial services | 2026 |
| Bowden Green Property Ltd | Real estate | 2026 |
| Bowden Holdings Limited | Financial services | 2019 |
| Bowerman's Brewery Ltd | Manufacturing | 2019 |
| Bowmarsh Roofing Ltd | Construction | 2016 |
| Boxed OFF Health and Safety Ltd | Professional & scientific | 2023 |
| BPS Windows and Doors Ltd | Extraterritorial | 2025 |
| BPT Medical Ltd | Wholesale & retail | 2017 |
| Bradley Lane MOT Centre Limited | Wholesale & retail | 2006 |
| Bradley Valley (Management Company NUMBER2) Limited | Households | 1984 |
| Bradley Valley (Newton Abbot) Management Company (NO.1) Limited | Households | 1976 |
| Braeside Flats Ltd | Real estate | 2026 |
| Braid the Rainbow Ltd | Other services | 2026 |
| Brave Production Studios Ltd | Information & communication | 2021 |
| Bravery Shipping Limited | Administrative & support | 2021 |
| Bravo Efrides Limited | Real estate | 2025 |
| Bravo Zulu Golf Ltd | Manufacturing | 2025 |
| Break Away DNB Ltd | Arts & recreation | 2023 |