| Bournemouth Lawncare Ltd | Administrative & support | 2021 |
| Bournemouth Pest Control Ltd | Administrative & support | 2026 |
| Bournemouth Plastering Ltd | Professional & scientific | 2014 |
| Bournemouth Sevens Limited | Arts & recreation | 2010 |
| Bournemouth Taxis Limited | Transport & logistics | 2014 |
| Bournemouth.Homes Limited | Real estate | 2023 |
| Bouverie 15-21 Limited | Households | 2020 |
| Bouwen Design Ltd | Professional & scientific | 2023 |
| BOW Group Ltd | Information & communication | 2010 |
| Bowlineconstruction Ltd | Construction | 2009 |
| Boyland Builders Limited | Construction | 2019 |
| Boyland Windows Ltd | Construction | 2011 |
| Boyut Trading UK Ltd | Wholesale & retail | 2017 |
| Bpci Ltd | Real estate | 2024 |
| BR Autocentre Ltd | Wholesale & retail | 2023 |
| BR Car Sales BH Limited | Wholesale & retail | 2025 |
| Bramfield Assets Ltd | Construction | 2018 |
| Branch Communication Ltd | Information & communication | 2026 |
| Branching OUT TWS Ltd | Administrative & support | 2023 |
| Brandon Electrical (Dorset & Hampshire) Ltd | Manufacturing | 2016 |
| Bransgore Church of England Primary School | Education | 2011 |
| Bransgore Professional Computing Limited | Information & communication | 2000 |
| Bransgore Properties Ltd | Real estate | 2025 |
| Brave Technology Group Ltd | Information & communication | 2016 |
| Braydel Construction Ltd | Construction | 2026 |
| Breathe Safety Group Ltd | Professional & scientific | 2012 |
| Breathe Safety Limited | Other services | 2003 |
| Brendon Green Mansions Limited | Construction | 2007 |
| Brewer Design & Build Ltd | Construction | 2017 |
| Brichard Ventures Ltd | Professional & scientific | 2026 |
| Bridge Business Solutions (UK) Limited | Information & communication | 2009 |
| Bridge Training Solutions Limited | Information & communication | 2005 |
| Bridgecoast Developments Ltd | Extraterritorial | 2019 |
| Bridgecoast Projects Ltd | Financial services | 2024 |
| Bridgecoast Properties Ltd | Extraterritorial | 2019 |
| Brightlife Enterprises Limited | Arts & recreation | 2006 |
| Brighton Harbour Hotel Limited | Real estate | 2014 |
| Brightside South Ltd | Financial services | 2022 |
| Brightsouth Ltd. | Information & communication | 2013 |
| Brimfield Limited | Hospitality | 1993 |
| Bristol Harbour Hotel Limited | Hospitality | 2015 |
| Britannia Broker Services Ltd | Financial services | 2026 |
| Britannia Legerstar Self Store Limited | Transport & logistics | 1985 |
| Britchiro Westbourne Ltd | Health & social care | 2013 |
| Broad Construction Ltd | Construction | 2016 |
| Broadcoms Solutions Ltd | Information & communication | 2020 |
| Broadoak Directors Limited | Administrative & support | 2002 |
| Broadoak Tree Care Limited | Administrative & support | 2008 |
| Bromsgrove Flats.Co.Uk Limited | Real estate | 2025 |
| Bronte Park Management Limited | Hospitality | 1977 |
| Brrd Limited | Real estate | 2004 |
| Brtnetworks Ltd | Information & communication | 2021 |
| Brunch Bar Ltd | Administrative & support | 2018 |
| BST Southern Ltd | Construction | 1988 |
| BTG Design Services Ltd | Manufacturing | 2014 |
| Btts Property Limited | Real estate | 2016 |
| Buchanan Building Contractors Limited | Construction | 2014 |
| Build Energy Limited | Professional & scientific | 2011 |
| Build Guide Ltd | Professional & scientific | 2025 |
| Buildsmith Property Services Ltd | Construction | 2024 |
| Built UP Marketing Ltd | Professional & scientific | 2025 |
| Burbridge House (Crossways) Management Company Limited | Households | 2024 |
| Burch Motor Works Limited | Wholesale & retail | 2014 |
| Burch Properties Ltd | Real estate | 2017 |
| Bure Brook Mews Management Limited | Households | 2024 |
| Bureside Limited | Households | 1986 |
| Burning Logs Limited | Information & communication | 2013 |
| Burnt Tree Ltd | Information & communication | 2024 |
| Burry and Knight Limited | Construction | 1955 |
| Burton Electrical Co. (South) Ltd | Construction | 2014 |
| Burton Teddy Bears Ltd | Health & social care | 2023 |
| Burys News Food & Wine Ltd | Wholesale & retail | 2013 |
| Busby's Gym Ltd | Arts & recreation | 2024 |
| Business Cost Reduction Limited | Professional & scientific | 2001 |
| BVM Consultants Ltd | Professional & scientific | 2012 |
| C & J Taxis Limited | Transport & logistics | 2011 |
| C & PP Projects Ltd | Households | 2016 |
| C & R Anaesthesia Ltd | Health & social care | 2016 |
| C - B Outdoor Catering Ltd. | Hospitality | 2017 |
| C Poole & SON Limited Partnership | | 2011 |
| C&J Production Ltd | Administrative & support | 2025 |
| C. S. Luke (Carpentry) Limited | Construction | 2003 |
| Caday Rouge Limited | Administrative & support | 2016 |
| Cadence Collective Community Interest Company | Information & communication | 2025 |
| Caerus Corporate Advisors Limited | Professional & scientific | 2025 |
| Caesar Spray Rend and Plastering Ltd | Construction | 2021 |
| Cala Computers Limited | Manufacturing | 1992 |
| Calibre Fitness Ltd | Arts & recreation | 2019 |
| Callow Hill AD Limited | Administrative & support | 2014 |
| Camellia Kebab & Pizza Ltd | Hospitality | 2024 |
| Camplife Ltd | Wholesale & retail | 2020 |
| Canine Complete Ltd | Wholesale & retail | 2026 |
| Canning Enterprises Limited | Real estate | 2016 |
| Cape House Management Limited | Households | 2007 |
| Capital Direction Limited | Manufacturing | 1993 |
| Capstan Security (Wessex) Limited | Professional & scientific | 2000 |
| Captiva (Mudeford) Limited | Administrative & support | 2006 |
| Caravanwise Limited | Financial services | 1998 |
| Cardan Fire Ltd | Public administration | 2020 |
| Carl Hunt Flooring Limited | Construction | 2002 |