| Brighter Productions Limited | Professional & scientific | 2010 |
| Brightschoolofenglish Limited | Education | 2010 |
| Brightside (Bournemouth) Ltd | Other services | 2024 |
| Brillbeck Developments Limited | Construction | 2016 |
| Brilliant Cleaning Bournemouth Ltd | Administrative & support | 2026 |
| Brimblewood Developments Limited | Construction | 1991 |
| Bringing Schools Together Ltd | Education | 2013 |
| Brinklea Freehold Limited | Households | 2015 |
| Bristol Short Lets Ltd | Real estate | 2002 |
| Bristowe DRY Cleaners Limited | Other services | 2009 |
| Brit Park Ltd | Administrative & support | 1990 |
| Britannia Asset One Ltd | Administrative & support | 2023 |
| Britannia Asset Two Ltd | Real estate | 2024 |
| Britannia Parking Group Limited | Financial services | 2012 |
| Britannia Parking Limited | Extraterritorial | 1996 |
| Britannia Parking Transport Services Ltd | Transport & logistics | 2010 |
| Britchiro New Milton Ltd | Health & social care | 2013 |
| Brite Smile Ltd | Health & social care | 2023 |
| Britestone Solutions Ltd | Administrative & support | 2025 |
| Britgo Limited | Transport & logistics | 2026 |
| Britguard Limited | Transport & logistics | 2013 |
| British American Trading Property Limited | Households | 2023 |
| British Chemicals Association | Other services | 1983 |
| British Moorlands Ltd | Agriculture & fishing | 2005 |
| British School of Marketing International Limited | Education | 2014 |
| Brittanic Ltd | Households | 2011 |
| Britydev Software Solutions Limited | Information & communication | 2025 |
| Brixey Holdings Limited | Financial services | 2024 |
| Broad Changes Care Ltd | Health & social care | 2023 |
| Broad Reach Psychology Practice Ltd | Health & social care | 2014 |
| Broadlands Management(Bournemouth)Limited | Households | 1967 |
| Broadminster Limited | Construction | 1987 |
| Broadside Developments Ltd | Construction | 2010 |
| Broadstone Chiropractic Clinic LLP | | 2016 |
| Broadstone PAC LLP | | 2023 |
| Broadway Lane Ltd | Households | 2019 |
| Broadwell Cottage Limited | Real estate | 2024 |
| Broadwey Lettings Limited | Real estate | 2020 |
| Brock International Student Service Ltd | Education | 2025 |
| Brockenhurst Court Limited | Households | 2000 |
| Brockenhurst International Student Service Limited | Education | 2015 |
| Broken MAN Limited | Hospitality | 1997 |
| Brokenford Developments Limited | Construction | 2018 |
| Bronzo Chiswick Limited | Hospitality | 2025 |
| Brook Financial Services Ltd | Financial services | 2010 |
| Brook Heating and Mechanical Services Ltd | Extraterritorial | 2015 |
| Brookfeild Estates Ltd | Real estate | 2026 |
| Brooklands Hotel LP | | 2018 |
| Brooklands Vintage Motor Company Limited | Wholesale & retail | 1988 |
| Brooklyn Freehold Limited | Households | 2008 |
| Brooklyn Home Improvements Ltd | Construction | 2025 |
| Brooks Bricks & Mortar Property Solutions Ltd | Real estate | 2023 |
| Brosis Properties Ltd | Real estate | 2015 |
| Brothers Make Ltd | Wholesale & retail | 2021 |
| Brothers Property Development Ltd | Construction | 2021 |
| Brothers Property Group Ltd | Real estate | 2016 |
| Brown 2 Earth Limited | Construction | 2018 |
| Brown Button Events Ltd | Arts & recreation | 2011 |
| Brown Dog Coffee Limited | Hospitality | 2019 |
| Brown's Grounds Maintenance Limited | Administrative & support | 2023 |
| Browning Avenue Management Company Limited | Real estate | 2004 |
| Browning Group Limited | Financial services | 2021 |
| Brownlow Court(Bournemouth)Management Company Limited | Households | 1963 |
| Brownsea Court (Management) Limited | Households | 2003 |
| Brownsea Haven Properties Limited | Hospitality | 1925 |
| Brownsea Haven Wholesale Limited | Professional & scientific | 1925 |
| Brownsea Open Air Theatre Limited | Arts & recreation | 1978 |
| Brownsea View Close Limited | Households | 1996 |
| Brownsea View Management Company Limited | Households | 2012 |
| Bruce LEE Properties Limited | Other services | 2022 |
| Bruce Toyne Flooring Limited | Construction | 2015 |
| Brunch Club Lounge Limited | Hospitality | 2019 |
| Brunlea Management Company Limited | Households | 1987 |
| Brunyee Tiling Limited | Construction | 2009 |
| BRUT4LWEAR Ltd | Wholesale & retail | 2026 |
| Bryanstone Consultancy Services Limited | Real estate | 2004 |
| Bryanstone Road Holdings Limited | Real estate | 2026 |
| Bryanstone SPV Limited | Financial services | 2026 |
| Bryanstone Trading Limited | Construction | 2014 |
| Bryant Furnishing Limited | Wholesale & retail | 2015 |
| Bryant Group Holdings Ltd | Wholesale & retail | 2021 |
| Bryg Consulting Limited | Extraterritorial | 2023 |
| Bryte Tech Solutions Community Interest Company | Information & communication | 2025 |
| BS Fitness Enterprises Ltd | Wholesale & retail | 2025 |
| BSD Drywall Limited | Construction | 2018 |
| BSL Homes Ltd | Real estate | 2025 |
| Bsmi Accommodation Ltd | Real estate | 2018 |
| Bsot CIC | Education | 2023 |
| BSP Installations Limited | Construction | 2018 |
| BSS 2019 Limited | Transport & logistics | 2019 |
| BT Plastering and Drylining Ltd | Construction | 2025 |
| BTJ Foods Ltd | Hospitality | 2019 |
| Btsa Group Ltd | Other services | 2019 |
| BU Community Business Limited | Education | 2019 |
| BU Innovations Limited | Professional & scientific | 1999 |
| Buba Transport Limited | Administrative & support | 2017 |
| Buba-Licious Ltd | Hospitality | 2018 |
| Bubbles Childcare Limited | Education | 2020 |
| Bubbles Laundry Shop Limited | Other services | 2011 |
| Buckingham Court (Highcliffe) RTM Company Limited | Households | 2023 |