| Blue Nose Refrigeration Ltd | Energy | 2010 |
| Blue Onda Ltd | Real estate | 2022 |
| Blue Peninsula Marine Limited | Transport & logistics | 2006 |
| Blue Sea Property Developments Limited | Construction | 2007 |
| Blue Skies Health and Safety Limited | Professional & scientific | 2021 |
| Blue Sky Action Ltd | Real estate | 2022 |
| Blue View Management Limited | Households | 2007 |
| BLUE4H Ltd | Real estate | 2018 |
| Bluebell Couriers Ltd | Transport & logistics | 2021 |
| Bluebell Travel Ltd | Transport & logistics | 2026 |
| Bluebridge Elite Integrated Network Ltd | Information & communication | 2026 |
| Blueline Plymouth Ltd | Education | 2024 |
| Blueprint Architectural Workshop Ltd | Professional & scientific | 2022 |
| Blueprint Global Limited | Health & social care | 2024 |
| Blueprint Kitchen Solutions Limited | Arts & recreation | 2017 |
| BLUESTONE360 Limited | Arts & recreation | 1988 |
| Bluevale Estates Limited | Real estate | 2007 |
| Bluezone Fishing Limited | Wholesale & retail | 2013 |
| Blugreens Ltd | Agriculture & fishing | 2020 |
| Blush Hospitality Limited | Transport & logistics | 2006 |
| BM Car Sales (SW) Limited | Wholesale & retail | 2021 |
| BMC Motorcycles Ltd | Wholesale & retail | 2017 |
| BMS Building Contractors (Plymouth) Ltd | Construction | 2012 |
| BN & MH Ltd | Manufacturing | 2022 |
| BN1 Developments Limited | Construction | 2020 |
| Board a Boat Limited | Administrative & support | 2013 |
| Board Management Services Ltd | Administrative & support | 2025 |
| Boarleigh Investment Co. Limited | Extraterritorial | 1975 |
| Boat Parts Direct Ltd | Manufacturing | 2021 |
| Boatcoat Limited | Extraterritorial | 2006 |
| Boathouse Investments (SW) Ltd | Households | 2022 |
| Boats Hydraulics Ltd | Manufacturing | 2022 |
| BOATSANDOUTBOARDS4SALE Limited | Wholesale & retail | 2012 |
| Boba & Broth Limited | Hospitality | 2026 |
| Bobo Hair Lounge Limited | Other services | 2025 |
| Bodhi Nirvana Ltd | Administrative & support | 2025 |
| Body & Wisdom (Plymouth) Limited | Real estate | 2012 |
| Body and Motion Ltd | Health & social care | 2021 |
| Body Bike UK Ltd | Wholesale & retail | 2024 |
| Body Evolution Ltd | Wholesale & retail | 2020 |
| Body Topia Ltd | Other services | 2016 |
| Bodyguard Covers Limited | Wholesale & retail | 2025 |
| Bodylines Gym Southwest Ltd | Arts & recreation | 2019 |
| Bofam Ltd | Financial services | 2018 |
| Boiler Care South West Ltd | Construction | 2016 |
| Boiler Energy Ltd | Construction | 2024 |
| Boisdale House Limited | Households | 2016 |
| BOL Management Ltd. | Real estate | 2000 |
| Bold Colours Painting Ltd | Construction | 2025 |
| Bolt Carpentry and General Builder Limited | Construction | 2026 |
| Bomburg Ltd | Hospitality | 2026 |
| BON Appetit Plymouth Ltd | Hospitality | 2017 |
| Bonbon Brownies Ltd | Manufacturing | 2022 |
| Bond Carpets Limited | Construction | 2003 |
| Bond Hygiene Therapy Ltd | Other services | 2020 |
| Bonds Property Investments Ltd | Real estate | 2019 |
| Bonds the Jewellers Online Limited | Wholesale & retail | 2002 |
| Bonhay & Eagle Property Company Limited | Real estate | 1928 |
| Bonhill Ltd. | Wholesale & retail | 2008 |
| Bonnie's Brunch Ltd | Hospitality | 2010 |
| Booking English Limited | Education | 2015 |
| Bookink Ltd | Wholesale & retail | 2025 |
| Books and Bytes Ltd | Information & communication | 2026 |
| Boom Rescue Limited | Transport & logistics | 2026 |
| Boons Management Company (Plymouth) Limited | Other services | 1988 |
| Booters Barbers Limited | Other services | 2026 |
| Booth Hill Auto's Ltd | Wholesale & retail | 2018 |
| Booth Hill Salvage Ltd | Wholesale & retail | 2015 |
| Borabeads Limited | Manufacturing | 2018 |
| Bordereau Limited | Wholesale & retail | 1977 |
| Bordersmart Ltd | Administrative & support | 2022 |
| Borft Woofty Ltd | Information & communication | 2024 |
| Boringdon Golf Range Ltd | Information & communication | 2023 |
| Boringdon Manor Garage Limited | Wholesale & retail | 1998 |
| Boringdon Plastics Limited | Wholesale & retail | 2005 |
| Borrow Don'T Buy CIC | Administrative & support | 2019 |
| Bosm Ltd | Construction | 2019 |
| Boulaidicare Limited | Health & social care | 2021 |
| Bounce Saltash Limited | Hospitality | 2024 |
| Bound 2B Theatre Limited | Administrative & support | 2025 |
| Bournemouth Peri Peri Ltd | Hospitality | 2025 |
| Boutique Bars (BB) Ltd | Professional & scientific | 2014 |
| Boutique Bars (CS) Ltd | Hospitality | 2013 |
| Boutique Bars (SS) Ltd | Hospitality | 2013 |
| Boutique Coffee Brands Ltd | Other services | 2011 |
| Bovisand Court Limited | Households | 1974 |
| Bowden Enterprises Limited | Real estate | 2011 |
| Bowden Farm Management Limited | Real estate | 1984 |
| Bowden Interiors Limited | Construction | 2006 |
| Bowden Leisure Limited | Health & social care | 2020 |
| Bowden Physiotherapy Limited | Health & social care | 2011 |
| Bowel Cancer West | Health & social care | 2010 |
| Boweravon Limited | Households | 1989 |
| Bowker Property Management Limited | Real estate | 2006 |
| Bowlers Hairdressing Ltd | Other services | 2012 |
| Bowring Construction Management Ltd | Professional & scientific | 2019 |
| Boxsmart Clothing Ltd | Wholesale & retail | 2018 |
| BP (Plymouth) Limited | Real estate | 2015 |
| BP Capital Holdings Limited | Real estate | 2025 |
| BP Engineering Services Limited | Construction | 2026 |