| BM Horner Ltd | Financial services | 2023 |
| BMC Building Projects Limited | Construction | 2014 |
| Bmcollectablesuk Ltd | Wholesale & retail | 2026 |
| BMR Barnes Ltd | Real estate | 2023 |
| BN Developments (South West) Limited | Real estate | 2022 |
| BNG Group Ltd | Professional & scientific | 2025 |
| BNG Maintenance SW Ltd | Construction | 2025 |
| Boat Share Greece Limited | Administrative & support | 2024 |
| BOB Davies Transport Limited | Transport & logistics | 2009 |
| Bochym Holdings Unlimited | Financial services | 2026 |
| Boden Projects Limited | Construction | 2014 |
| Bodrwnsiwn Properties Ltd | Real estate | 2018 |
| Bodytek (Taunton) Limited | Wholesale & retail | 2004 |
| Bodyworld (Plymouth) Limited | Arts & recreation | 2019 |
| Bodyworld (Taunton) Ltd | Arts & recreation | 2016 |
| Bogdan Dent Ltd | Health & social care | 2016 |
| Bold & Brave Limited | Hospitality | 2025 |
| Bollington Vets Ltd | Professional & scientific | 2015 |
| Bolton Construction and Restoration LLP | | 2025 |
| Bolton Property Developments Ltd | Construction | 2025 |
| Boltsoft Solutions Ltd | Manufacturing | 2018 |
| Bombay Holdings | Financial services | 2021 |
| Bombay Investments | Financial services | 2021 |
| Bond Otter Holdings Ltd | Financial services | 2026 |
| Bondbailey Limited | Construction | 2008 |
| Bondstones (1990) Ltd. | Real estate | 2014 |
| Bone and Joint Surgery Limited | Health & social care | 2022 |
| Bone Yard Ltd | Hospitality | 2025 |
| Boni & GUY Ltd | Other services | 2020 |
| Boning Trade Ltd | Wholesale & retail | 2023 |
| Bonobo Properties Ltd | Real estate | 2026 |
| Book to Screen Ltd | Information & communication | 2022 |
| Booking Brain Ltd | Information & communication | 2025 |
| Boomer Farm Ltd | Hospitality | 2024 |
| Boomerang Resources Limited | Manufacturing | 2015 |
| Boon.Hair Ltd | Other services | 2019 |
| Border Reiver Investment Company Limited | Financial services | 2021 |
| Bordon Consulting Ltd | Professional & scientific | 2023 |
| Born Freelance Limited | Real estate | 2019 |
| Born North Ltd | Professional & scientific | 2016 |
| BOS Coffee Co Ltd | Hospitality | 2026 |
| Boshers Ltd | Financial services | 1994 |
| Boskensoe Barns LLP | | 2017 |
| Bostor Limited | Wholesale & retail | 2017 |
| Bottom Line Property Rentals Ltd | Real estate | 2021 |
| Bouge Limited | Construction | 2007 |
| Bouken Project Limited | Wholesale & retail | 2013 |
| Boulevard Kitchen & Appliance Centre Limited | Wholesale & retail | 1982 |
| Bound to Resin Southwest Ltd | Construction | 2025 |
| Boundary Holdings Limited | Real estate | 2019 |
| Boutique Hair & Beauty (SW) Ltd | Other services | 2015 |
| BOW and Snow Limited | Wholesale & retail | 2023 |
| Bowden & Bowden Holdings Limited | Professional & scientific | 2024 |
| Bowen's LIP FIX Ltd | Manufacturing | 2026 |
| Bowline Court Minehead Management Limited | Households | 2002 |
| Bowman Brave Limited | Professional & scientific | 2025 |
| Box Taunton Ltd | Extraterritorial | 2020 |
| Boyd Movie Company Limited | Information & communication | 2009 |
| BPY Healthcare Limited | Wholesale & retail | 2011 |
| Brabbott Limited | Real estate | 2020 |
| Brackendale Holdings Ltd | Financial services | 2025 |
| Brackenhill Group Limited | Financial services | 2022 |
| Bradbury Civils Ltd | Professional & scientific | 2024 |
| Bradfields Farm Limited | Agriculture & fishing | 1960 |
| Bradley Barnes Consulting Ltd | Professional & scientific | 2020 |
| Bradley Barnes Properties Ltd | Real estate | 2021 |
| Bradley the Blacksmith Limited | Manufacturing | 2022 |
| Bradleys Surfacing Systems Limited | Construction | 2011 |
| Bramble & Co. (SW) Limited | Manufacturing | 2003 |
| Bramble and Wild Limited | Wholesale & retail | 2022 |
| Brams Logistics Ltd | Transport & logistics | 2025 |
| Branco REX Ltd | Arts & recreation | 2014 |
| Brand IT Loud Ltd | Information & communication | 2026 |
| Brandley Estates Limited | Real estate | 1999 |
| Brands of Tomorrow Limited | Information & communication | 2009 |
| Branfield Restoration Limited | Construction | 2014 |
| Branham's Limited | Wholesale & retail | 1999 |
| Brannan Plumbing & Heating Limited | Construction | 2008 |
| Brans Logistic Services Limited | Education | 2011 |
| Bratton Commercial Developments Limited | Extraterritorial | 2006 |
| Brava Interiors Ltd | Construction | 2025 |
| Bravo Events Ltd | Professional & scientific | 2017 |
| Bray Farms Ltd | Agriculture & fishing | 2019 |
| Bray's Cider Limited | Manufacturing | 2021 |
| Breaking Ground Heritage C.I.C. | Education | 2016 |
| Brean Beach Holiday Parks Limited | Hospitality | 2003 |
| Brean Down Caravan Park Limited | Hospitality | 2008 |
| Breast Care Leicester Limited | Health & social care | 2018 |
| Bredon Village Fish and Chip Shop Ltd | Hospitality | 2018 |
| Breed Elliott (S.W.) Limited | Financial services | 2010 |
| Brencrown Limited | Hospitality | 1998 |
| Brendan MJ Steer Legal Services Ltd | Professional & scientific | 2014 |
| Brendon Books CIC | Wholesale & retail | 2014 |
| Brendon EOT Limited | Administrative & support | 2026 |
| Brendon Greenhouse Community Interest Company | Administrative & support | 2023 |
| Brendon Holdings Limited | Financial services | 2024 |
| Brendon Limited | Manufacturing | 1988 |
| Brendon Service Station Limited | Wholesale & retail | 2006 |
| Bretland Consulting Ltd | Professional & scientific | 2022 |
| Brew Planet Ltd | Wholesale & retail | 2022 |