| Beau Investments Limited | Financial services | 2019 |
| Beaufort Property Rentals Ltd | Real estate | 2025 |
| Beaulieu Garage Limited | Wholesale & retail | 1997 |
| Beaulieu Gardens Ltd | Hospitality | 2008 |
| Beckley Energy Limited | Energy | 2012 |
| Becloud Solutions Ltd | Information & communication | 2014 |
| BED BUG Doctor Limited | Administrative & support | 2018 |
| Bedtime Christchurch Limited | Wholesale & retail | 2011 |
| Beeaccounting Ltd | Professional & scientific | 2026 |
| Beechcroft Consulting Ltd | Professional & scientific | 2020 |
| Beejay Enterprises Limited | Construction | 1997 |
| Beekeepers Walk Management Company Limited | Households | 2020 |
| Beer and Blues Limited | Hospitality | 2016 |
| Belle VUE 179 Management Limited | Households | 1993 |
| Bellysworth Limited | Wholesale & retail | 2023 |
| Belmore Building Contractors Ltd | Construction | 2008 |
| Belmore Building Ltd | Construction | 2024 |
| Belmore Developments Ltd | Construction | 2012 |
| Belvedere Flats Management Company Limited | Households | 1995 |
| BEN Reeves Limited | Wholesale & retail | 2016 |
| Bench Marque Wines Ltd | Wholesale & retail | 2010 |
| Benfleet Investments Limited | Real estate | 2001 |
| Bennett & Moody Developments Ltd | Construction | 2016 |
| Bennett Tribe Developments Limited | Real estate | 2005 |
| Bennettassetholdings Limited | Real estate | 2026 |
| Beray Limited | Wholesale & retail | 2014 |
| Best Auto Parts Ltd | Wholesale & retail | 2019 |
| Beth Saunders Financial Services Ltd | Financial services | 2016 |
| BETTER2EARTH (Morocco) Ltd | Wholesale & retail | 2024 |
| BETTER2EARTH Group Ltd | Wholesale & retail | 2022 |
| Bevis Studios Limited | Arts & recreation | 2025 |
| Beyond Retail Holdings Limited | Financial services | 2020 |
| Beyond Retail Ltd | Wholesale & retail | 2010 |
| BH Fabrications Limited | Manufacturing | 2023 |
| BH23 Properties Ltd | Real estate | 2025 |
| Big Bear Consultancy Services Limited | Professional & scientific | 2020 |
| Big Blind Cat Limited | Information & communication | 2022 |
| Big Dog Limited | Professional & scientific | 2012 |
| Big Money Competitions Limited | Wholesale & retail | 2022 |
| Big Name IT Consultancy Ltd | Information & communication | 2006 |
| Bikes Electric Limited | Extraterritorial | 2012 |
| Billy Marsh Drama Limited | Administrative & support | 2002 |
| Billy TEE LLP | | 2008 |
| Biogotec Ltd | Professional & scientific | 2008 |
| Biosupply Group Ltd | Wholesale & retail | 2026 |
| Birch & Poole Property Ltd | Real estate | 2026 |
| Birtchnells of Highcliffe Limited | Wholesale & retail | 2013 |
| Bivillas Limited | Financial services | 2014 |
| Biztechniques Ltd | Education | 2021 |
| Bizzebee Limited | Professional & scientific | 2000 |
| Black Pearl Props Ltd | Information & communication | 2025 |
| Black PIG Solutions Ltd | Construction | 2022 |
| Black Wildcat Ltd | Manufacturing | 2010 |
| BLACKWOOD86 Limited | Professional & scientific | 2021 |
| Blades of Highcliffe Limited | Health & social care | 2015 |
| Blakewood Homes Limited | Construction | 2016 |
| Blazetaste Holdings Limited | Real estate | 2018 |
| Blazetaste Limited | Hospitality | 1994 |
| Blend 2 Vend Ltd | Wholesale & retail | 2024 |
| Blighwood 57 Management Limited | Households | 1997 |
| Blink Installation Ltd | Construction | 2018 |
| Bloom Finance Group C.I.C. | Information & communication | 2012 |
| Bloom Motion Ltd | Information & communication | 2022 |
| Blossom Tiaras Limited | Wholesale & retail | 2002 |
| BLU (UK) Ltd | Administrative & support | 2011 |
| BLU Leisure Ltd | Other services | 2004 |
| BLU Swim Ltd | Extraterritorial | 2012 |
| Blue Anchor (Hoburne) Limited | Hospitality | 1956 |
| Blue Anchor Property Holdings Limited | Real estate | 2024 |
| Blue Brick Consultancy Limited | Professional & scientific | 2012 |
| Blue Fusion Trading Limited | Construction | 2018 |
| Blue Ocean Island Holdings SA Limited | Real estate | 2022 |
| Blue Sovereign Developments Limited | Construction | 1990 |
| Bluewater Pools & Leisure Limited | Arts & recreation | 2000 |
| Bluewater Swimming Pools Ltd | Construction | 2022 |
| Blush the Salon Ltd | Other services | 2025 |
| Blusky HR and Coaching Services Ltd | Administrative & support | 2020 |
| Boardbuddyco Ltd | Construction | 2012 |
| Boatfests Ltd | Administrative & support | 2025 |
| Bodega Southbourne Limited | Hospitality | 2024 |
| Bodega UK Limited | Hospitality | 2024 |
| Bollywood Express Ltd | Hospitality | 2025 |
| Bolton Close Management Company Limited | Real estate | 2004 |
| Bonafide Wines Limited | Wholesale & retail | 2005 |
| Bond Street Estates (Brighton) Limited | Hospitality | 2005 |
| Booboobear Ltd | Real estate | 2018 |
| Boom! Healthcare Communications Limited | Professional & scientific | 2018 |
| Boom! Property Management Limited | Real estate | 2026 |
| Boray Ltd | Real estate | 2025 |
| Born to Lawn Ltd | Administrative & support | 2019 |
| Bosh Communications Ltd | Information & communication | 2022 |
| Boudica Cybersecurity Ltd | Information & communication | 2023 |
| Bouncehouseboutique Limited | Administrative & support | 2022 |
| Bourne Aesthetics Dorset Ltd | Other services | 2024 |
| Bournemouth Airport Transfers Dorset Ltd | Transport & logistics | 2025 |
| Bournemouth Aviation Services Ltd. | Manufacturing | 1983 |
| Bournemouth Christchurch Poole Accommodation BID Ltd | Other services | 2024 |
| Bournemouth Coastal BID | Public administration | 2012 |
| Bournemouth Convention Bureau Limited | Other services | 1994 |
| Bournemouth International Airport Limited | Transport & logistics | 1986 |