| Boyd Wallis Consulting Limited | Financial services | 2016 |
| Boyd Wallis Holdings Limited | Financial services | 2021 |
| Boyd Wallis Homes Limited | Real estate | 2014 |
| Boyd Wallis Limited | Financial services | 2016 |
| Boyd Wallis Opco Limited | Financial services | 2023 |
| Boys' Impact CIC | Professional & scientific | 2025 |
| BP Flats Ltd | Real estate | 2017 |
| BP House Ltd | Real estate | 2022 |
| BP Quality Cleaning Limited | Administrative & support | 2023 |
| BR Drivers Ltd | Transport & logistics | 2026 |
| BR Help Ltd | Administrative & support | 2022 |
| BR Property Bournemouth Ltd | Real estate | 2025 |
| Brace Developments (Bournemouth) Ltd | Administrative & support | 2014 |
| Bracken Court Freehold Limited | Professional & scientific | 2005 |
| Bracken Lodge Management Company Limited | Hospitality | 1992 |
| Bracken&Broch Ltd | Wholesale & retail | 2025 |
| Brackendene Management Company Limited | Households | 2017 |
| Brackenridge Estates Limited | Real estate | 1997 |
| Brackensway Management Company Limited | Households | 1972 |
| Brackenwood (Bournemouth) Management Company Limited | Households | 2001 |
| Bradbear Arts Limited | Arts & recreation | 2015 |
| Bradbish Ltd | Real estate | 2016 |
| Bradel Ltd | Hospitality | 2017 |
| Bradman Properties Limited | Real estate | 2016 |
| Bradshaw Estates Holdings Ltd | Real estate | 2015 |
| Bradshaw Properties Ltd | Extraterritorial | 2015 |
| Bradshaws Garden Maintenance Limited | Administrative & support | 2002 |
| Braemar Lodge Management Limited | Households | 1997 |
| Braidley Mansions Limited | Households | 1960 |
| Braidley Park Limited | Households | 2018 |
| Brain Buster Ltd. | Professional & scientific | 2015 |
| Brain Tides Ltd | Wholesale & retail | 2023 |
| Bramax Agencies Limited | Wholesale & retail | 2015 |
| Bran Repairs Ltd | Construction | 2025 |
| Branchstone Holdings Limited | Financial services | 2026 |
| Branchstone Homes Limited | Real estate | 2026 |
| Brandon Court Residents Limited | Households | 1959 |
| Branksome Cliff Management Company Limited | Households | 1985 |
| Branksome Gate Limited | Households | 2019 |
| Branksome Grange Management Company Limited | Households | 1981 |
| Branksome Leisure Limited | Real estate | 2011 |
| Branksome Park Holdings Limited | Financial services | 2013 |
| Bransford Lodge Limited | Hospitality | 2013 |
| Bransgore Chippy Ltd | Hospitality | 2018 |
| Bransgore Vets Limited | Professional & scientific | 2011 |
| Brantal Surfacing Limited | Construction | 2015 |
| Brasa Burger Clapham Ltd | Hospitality | 2022 |
| Brasa Burger Ltd | Hospitality | 2021 |
| Bravada Ltd | Wholesale & retail | 2015 |
| Bravestone Property Ltd | Real estate | 2022 |
| Brazil Property Lawyers Ltd | Professional & scientific | 2009 |
| Brazilian Beef Ltd | Wholesale & retail | 2019 |
| Brazuka Ltd | Hospitality | 2024 |
| Bread Street Films Limited | Arts & recreation | 2011 |
| Breakell Properties Ltd | Real estate | 2021 |
| Brearley Building Services Limited | Construction | 1998 |
| Breath of Life Faith Ministries | Professional & scientific | 2015 |
| Breathe Estates Limited | Construction | 2007 |
| Breathwork Design Ltd | Professional & scientific | 2025 |
| Breathwork Meditace Ltd | Other services | 2021 |
| Breckenridge Developments Limited | Real estate | 2025 |
| Bredon Court Hotel Limited | Hospitality | 1998 |
| Breizh Atao Ltd | Administrative & support | 2019 |
| Brendan Cranston Building Limited | Construction | 2018 |
| Brenscombe Management Company Limited | Households | 1987 |
| Brewer & Brewer Limited | Real estate | 2004 |
| Brewers Joint Operations Limited | Extraterritorial | 1986 |
| Brian Pittwood Limited | Professional & scientific | 2020 |
| Brian Stock Football Academy Ltd | Arts & recreation | 2016 |
| Briarfield Freehold Limited | Households | 2011 |
| Brick and Key Properties Ltd | Real estate | 2025 |
| Brick Rise Ltd | Real estate | 2025 |
| Bridal Couture Ltd | Wholesale & retail | 2018 |
| Bride Valley Recovery (South West) Limited | Financial services | 2017 |
| Bridgafide Ltd | Education | 2019 |
| Bridge Source Partner Ltd | Wholesale & retail | 2025 |
| Bridgegate Property Management Ltd | Real estate | 2025 |
| Bridget Long Companies Limited | Wholesale & retail | 2018 |
| Bridgewater Contractors Limited | Construction | 2010 |
| Bridgewater Property Group Ltd | Real estate | 2021 |
| Bridgeway Care and Education Ltd | Extraterritorial | 2020 |
| Bridgeway Trade Ltd | Wholesale & retail | 2026 |
| Bridging Solutions Direct Limited | Financial services | 2020 |
| Bridport House Limited | Construction | 2017 |
| Bridport Medical Centre Limited | Professional & scientific | 2005 |
| Brigantes Consulting Limited | Public administration | 2014 |
| Brigantes International Limited | Public administration | 2022 |
| Briggs Fine Food and Beverage Advisers Ltd | Wholesale & retail | 2018 |
| Bright Blue Day Limited | Professional & scientific | 2002 |
| Bright Green BIO Ltd | Professional & scientific | 2017 |
| Bright Landlord Services Ltd | Administrative & support | 2023 |
| Bright Link Investments Ltd | Real estate | 2012 |
| Bright Site Projects Ltd | Construction | 2025 |
| Bright Sparks Cleaning Services Limited | Administrative & support | 2025 |
| Bright Spraying Solutions Limited | Construction | 2023 |
| Bright Things Ltd | Professional & scientific | 2017 |
| Brightbeer Limited | Manufacturing | 2012 |
| Brightbest Ltd | Construction | 2008 |
| Brighter Europe Corporation Ltd | Wholesale & retail | 2006 |
| Brighter Footsteps Mentoring Ltd | Education | 2026 |