| Bendell Publicity Consultants Limited | Professional & scientific | 2008 |
| BEP & Sons Limited | Construction | 2010 |
| Bergman Properties Limited | Real estate | 2017 |
| Best Business Services Limited | Administrative & support | 2006 |
| Better Drains Limited | Other services | 2023 |
| BH Commercial Cleaning Limited | Administrative & support | 2018 |
| BH Consulting (UK) Limited | Real estate | 2013 |
| BH Radio Ltd | Information & communication | 2017 |
| BH Rooms Ltd | Information & communication | 2024 |
| BH21 Ltd | Professional & scientific | 2000 |
| Bilana Limited | Hospitality | 2026 |
| Bill Askar Real Estate Ltd | Construction | 2018 |
| Bindon Abbey Wellness Retreat Ltd | Other services | 2009 |
| Bingo Parties Ltd | Arts & recreation | 2025 |
| Birdworld Limited | Arts & recreation | 1958 |
| Bistech Group PLC | Information & communication | 2009 |
| Bistech Property Services Ltd | Real estate | 2014 |
| Bitpeaks Limited | Wholesale & retail | 2018 |
| BIZ Smart Solutions Ltd | Professional & scientific | 2024 |
| BKR Asset Trading Limited | Professional & scientific | 2026 |
| Black Mountain Spring Water Ltd | Professional & scientific | 2010 |
| Black Swan Holdings Limited | Real estate | 1999 |
| Blackerton Limited | Real estate | 2023 |
| Blackerton Village Maintenance Limited | Households | 2013 |
| Blackfield Finance Limited | Administrative & support | 2011 |
| Blaze Project Management Ltd | Information & communication | 2025 |
| Blindwise Limited | Wholesale & retail | 2008 |
| Bliss Clean Group Ltd | Administrative & support | 2024 |
| Blue Haze Property Services Limited | Households | 2012 |
| Blue Lawns Management Company Limited | Households | 1996 |
| Boardlight Limited | Manufacturing | 2020 |
| Bodycare Accident Repair Centre Limited | Wholesale & retail | 2010 |
| Bold GAS Detection Solutions Ltd | Administrative & support | 2021 |
| Bolder Estates Limited | Construction | 2025 |
| Boldshapes Ltd | Wholesale & retail | 2020 |
| Bolla Bags Limited | Wholesale & retail | 2007 |
| Bonddrywall Commercial Ltd | Construction | 2023 |
| Bonnies Travel Ltd | Administrative & support | 2023 |
| Bookanyroom.Com Ltd | Administrative & support | 2021 |
| Boomfit Ltd | Wholesale & retail | 2020 |
| Borders & West (Inc.Howe & Co.) Limited | Professional & scientific | 1995 |
| Borders & West (Shropshire) Limited | Professional & scientific | 2014 |
| Borders & West LP | | 2006 |
| Bournemouth and District Car Club Limited | Arts & recreation | 1951 |
| Bournemouth Boat Trips Ltd | Transport & logistics | 2024 |
| Bournemouth Plumbing Solutions Ltd | Construction | 2011 |
| Bournemouth Roofing Company Ltd | Construction | 2019 |
| Bournemouth Scrap Metal Limited | Wholesale & retail | 2026 |
| Bowman Estate Planning Ltd | Professional & scientific | 2015 |
| BP Import Limited | Wholesale & retail | 2011 |
| BR Architecture Limited | Professional & scientific | 2022 |
| Bradchart Limited | Administrative & support | 1990 |
| Braemar Homes Limited | Construction | 2022 |
| Bramley Construction Services Limited | Construction | 2016 |
| Brandguard Secure Recycling Ltd | Water & waste | 2024 |
| Branksome Business Park Management Company Limited | Professional & scientific | 2006 |
| Brian James Roofing Ltd | Construction | 2012 |
| Bridgymast Limited | Professional & scientific | 2018 |
| Brierley Avenue Residents Association | Extraterritorial | 2011 |
| Briggs Pension Management Limited | Financial services | 2024 |
| Bright Code Digital Ltd | Professional & scientific | 2024 |
| Bright Vision Consultancy Limited | Professional & scientific | 2014 |
| Brightperch Property Management Limited | Administrative & support | 2003 |
| Brightshield Home Improvements Ltd | Construction | 2024 |
| Brightsparks Property & Investment Ltd | Real estate | 2020 |
| Britannia Car Services Limited | Transport & logistics | 2019 |
| British Hydropower Association Limited | Other services | 2006 |
| Broadlands Hospitality Ltd | Hospitality | 2020 |
| Broadlands Pantry Ltd | Hospitality | 2024 |
| Broadlands Ventures Limited | Construction | 2022 |
| Broadleas Management (Ferndown) Limited | Real estate | 1993 |
| Broni&Bo Ltd | Wholesale & retail | 2022 |
| Brook Road Garage Limited | Wholesale & retail | 2011 |
| Brookside Properties (Dorset) Limited | Real estate | 1986 |
| Broomfield Flat Management Limited | Households | 1981 |
| Brown & Cane Financial Services Limited | Administrative & support | 2007 |
| Brown & Hart Sales and Lettings Ltd | Real estate | 2024 |
| Brownfield Limited | Professional & scientific | 2024 |
| Brushmagix Ltd | Wholesale & retail | 2017 |
| Brushwood Management Company (Milford) Ltd | Households | 2022 |
| Brylant Consulting Limited | Wholesale & retail | 2013 |
| Buckhurst Development Ltd | Real estate | 2016 |
| Buddy's Appliance Repairs Ltd | Other services | 2026 |
| Build a House Crowd Limited | Professional & scientific | 2015 |
| Bureau Telecoms Limited | Information & communication | 2009 |
| Burrcross Limited | Real estate | 2014 |
| Burrett Builders Ltd | Construction | 2017 |
| Burrett Holdings Ltd | Financial services | 2017 |
| Business Figures Ltd. | Professional & scientific | 2013 |
| Butts Builders Ltd | Construction | 2024 |
| BV Ventures Ltd | Professional & scientific | 2025 |
| BW 1907 Ltd | Professional & scientific | 2023 |
| BW Secretariat Limited | Professional & scientific | 2023 |
| Bwc-Gb LP | | 2016 |
| C E S Management Limited | Professional & scientific | 2010 |
| C I Capital | Financial services | 2026 |
| C&L Alliance Ltd | Hospitality | 2020 |
| C.O.B. Car Sales Limited | Wholesale & retail | 2012 |
| CAD Direct Ltd | Manufacturing | 2008 |
| Cafe Aroma Lounge Ltd | Hospitality | 2023 |