| BM Freight Ltd | Transport & logistics | 2023 |
| BM Property Solutions Ltd | Real estate | 2024 |
| Bmac Builders Ltd | Construction | 2015 |
| Board Property Services Ltd | Real estate | 2020 |
| BOB Farrington Limited | Professional & scientific | 2007 |
| Bobe (SW) Ltd | Real estate | 2020 |
| Bocaiuva Ltd | Information & communication | 2022 |
| Boconnoc Estate Holidays Limited | Extraterritorial | 2002 |
| Boconnoc Events Limited | Arts & recreation | 2002 |
| Boconnoc House Limited | Hospitality | 2002 |
| Bodell Parking Ltd | Hospitality | 2025 |
| Bofour Estates Limited | Real estate | 2022 |
| Boganlea Renewable Energy Limited | Energy | 2006 |
| Boho Events Ltd | Administrative & support | 2026 |
| Boiler Installation Bristol Ltd | Construction | 2018 |
| Boiler Smart Ltd | Construction | 2018 |
| Bold Sparks Ltd | Wholesale & retail | 2021 |
| Boldventures Hospitality Ltd | Hospitality | 2025 |
| Bombay Spice (Devon) Ltd | Hospitality | 2018 |
| Bombay Spice (Exeter) Limited | Hospitality | 2023 |
| Bomby Ltd | Professional & scientific | 2014 |
| Bond & Green Ltd | Construction | 2015 |
| Bond Storage Ltd | Transport & logistics | 2025 |
| Boniface Community Homes Ltd | Construction | 2025 |
| Boniface Court Management Company Limited | Households | 2009 |
| Boniface Developments (Paignton) Ltd | Real estate | 2025 |
| Bonzo Trading Limited | Wholesale & retail | 2024 |
| Books on the Couch Limited | Wholesale & retail | 2024 |
| Boost IT Technologies Ltd | Information & communication | 2018 |
| Boost Your Business Network Ltd | Professional & scientific | 2024 |
| Border Stoneware Southern Limited | Wholesale & retail | 2013 |
| Borea Ltd | Information & communication | 2004 |
| Borehole Logistics Limited | Professional & scientific | 2020 |
| Borland Electrical Services Limited | Construction | 2015 |
| Borland Properties Ltd | Real estate | 2021 |
| Born Alpha Ltd | Extraterritorial | 2023 |
| Born Ltd | Professional & scientific | 2018 |
| Bossiney Books Ltd | Information & communication | 2002 |
| Bosstec Services Ltd | Construction | 2024 |
| Boston Quay Management Limited | Extraterritorial | 2022 |
| Bothar BUI Properties Ltd | Real estate | 2022 |
| Bottco Limited | Real estate | 2015 |
| Bottled and Canned Ltd | Manufacturing | 2019 |
| Botus Property Solutions Limited | Real estate | 2024 |
| Boudoir Boutique Ltd | Wholesale & retail | 2022 |
| Boulevard Holdings Limited | Administrative & support | 1993 |
| Boulevard House Management Limited | Households | 2024 |
| Boulevard Ventures Limited | Construction | 1989 |
| Bounce Back (SW) Ltd | Health & social care | 2019 |
| Bounce Back Resilience Ltd | Professional & scientific | 2017 |
| Boundary Contractors Ltd | Construction | 2004 |
| Boundy Plumbing & Heating Ltd | Construction | 2019 |
| Boutique Student Living (Exeter) Limited | Real estate | 2022 |
| Boutique Student Living (Swansea) Limited | Real estate | 2022 |
| Bouverie Management Limited | Households | 1998 |
| Bovey Construction Limited | Construction | 1999 |
| BOW Commercial Developments Limited | Professional & scientific | 2019 |
| Bowden Estates Limited | Real estate | 2021 |
| Bower Eco Homes Ltd | Construction | 2019 |
| Bowfield Dart Ltd | Construction | 2025 |
| Bowker Limited | Agriculture & fishing | 2000 |
| Bowley Homes Ltd | Real estate | 2020 |
| Bowmore Funding Ltd | Other services | 2022 |
| Box Bush Commercials (UK) Ltd | Wholesale & retail | 2022 |
| Box Bush Commercials Ltd | Wholesale & retail | 2014 |
| Box Twelve Limited | Information & communication | 2005 |
| Boxer Buiding Services Ltd | Construction | 2026 |
| Boxfish Ltd | Information & communication | 2014 |
| Boyce & Company Packaging Limited | Administrative & support | 2008 |
| Boyle Tricks Leonard Limited | Professional & scientific | 2016 |
| Boys Couriers Ltd | Transport & logistics | 2026 |
| BP Couriers Ltd | Transport & logistics | 2021 |
| BP Film Development Limited | Information & communication | 2013 |
| BP27 Ltd | Real estate | 2021 |
| BPA Corporate Facilitation Limited | Professional & scientific | 1992 |
| BPF Custom Autos Ltd | Wholesale & retail | 2026 |
| Bracken Bespoke Garden Buildings Ltd | Construction | 2025 |
| Bracken Court Management Company Limited | Households | 2014 |
| Bradbury Capital Ltd | Financial services | 2026 |
| Bradland Homes Limited | Real estate | 2021 |
| Bradley Duhy Estate Agent Ltd | Real estate | 2024 |
| Bradninch Together Community Interest Company | Other services | 2021 |
| Brady Construction Services Limited | Construction | 2012 |
| Braid Park (Tiverton) Management Company Limited | Real estate | 2019 |
| Brain-In-Hand Limited | Information & communication | 2009 |
| Bramble Holdings Limited | Financial services | 2016 |
| Bramcourt Limited | Real estate | 2024 |
| Bramdean Field C.I.C. | Health & social care | 2026 |
| Brampford House Estate Limited | Real estate | 2000 |
| Bramshaw Bathrooms Ltd | Construction | 2024 |
| Bramshaw Construction Ltd | Construction | 2024 |
| Bramshaw Heating and Plumbing Limited | Construction | 2013 |
| Brand Stable Distribution Limited | Wholesale & retail | 2008 |
| Brandaio Limited | Information & communication | 2023 |
| Branded Barrels Ltd | Hospitality | 2024 |
| Brandesiuk Ltd | Professional & scientific | 2020 |
| Branton Homes Limited | Real estate | 2020 |
| Branton Property Group Limited | Extraterritorial | 2020 |
| Branton Property Limited | Real estate | 2020 |
| Brantrake Developments Ltd | Real estate | 2018 |