| Arkemm Software Limited | Information & communication | 2007 |
| Artist Nails (Weymouth) Ltd | Other services | 2017 |
| Artlan Ltd | Wholesale & retail | 2023 |
| AS and CM Christensen Trading AS Longlands Farm | | 1998 |
| Ashes Menswear (Holdings) Limited | Professional & scientific | 2003 |
| Ashes Menswear Limited | Wholesale & retail | 1987 |
| Ashley 189 Limited | Real estate | 2021 |
| Ashley Coombes Design Limited | Wholesale & retail | 2003 |
| Ashley Ruben Limited | Administrative & support | 1999 |
| Ashurst Investments Limited | Real estate | 1978 |
| Aspen Gardens Management Company NO 2 Limited | Households | 1980 |
| Asset Property Management Limited | Real estate | 2006 |
| Asset Services Limited | Information & communication | 1994 |
| Assign Systems Limited | Information & communication | 1995 |
| Aston Worsley Limited | Professional & scientific | 1995 |
| AT Home Technical Support Ltd | Information & communication | 2006 |
| Attwood Hotels Limited | Hospitality | 2002 |
| Audiojuice Limited | Professional & scientific | 2003 |
| Aura (South) Ltd | Other services | 2017 |
| Auto Moto Kris Limited | Administrative & support | 2007 |
| Avalon Financial Services Limited | Financial services | 1998 |
| B & V (Realisations) Limited | Wholesale & retail | 1934 |
| B a 'Bunny' Limited | Professional & scientific | 1998 |
| B Never TOO Busy to BE Beautiful Limited | Extraterritorial | 2003 |
| B P Enterprises (Southern) Limited | Construction | 2004 |
| B. Curtis Limited | Manufacturing | 1961 |
| B.J. GUY Ltd | Water & waste | 2002 |
| B.Krishnan Limited | Health & social care | 2016 |
| B.R. Developments Limited | Construction | 1995 |
| B2TT Property Group Ltd | Real estate | 2026 |
| Babu.K Limited | Financial services | 2020 |
| Back in Balance (Wimborne) Limited | Health & social care | 1996 |
| Back in Form Limited | Health & social care | 2002 |
| Badger Ales Limited | Manufacturing | 1974 |
| Baildon Lodge Management Limited | Real estate | 1987 |
| Bailey-Wareham Limited | Manufacturing | 1994 |
| Barbus Limited | Construction | 2005 |
| Bare Barrel Ltd | Wholesale & retail | 2020 |
| Barking MAD Holdings Limited | Financial services | 2019 |
| Barretts Glass and Window Centre Limited | Wholesale & retail | 2001 |
| Bartletts Country Stores Ltd. | Wholesale & retail | 1975 |
| Bathroom Inspirations Limited | Wholesale & retail | 2004 |
| Bay Tree (Burnaby Road) Management Company Limited | Households | 2000 |
| Bayford Motors Wincanton Ltd | Wholesale & retail | 2001 |
| Beagle Technology Group Limited | Manufacturing | 1969 |
| Beatbox Limited | Arts & recreation | 1984 |
| Beauchamp House Nursing Home Limited | Health & social care | 1973 |
| Beauty Stores Ltd | Wholesale & retail | 2014 |
| Beckox Plastic Fabrications Limited | Manufacturing | 1982 |
| Becoms Limited | Information & communication | 1996 |
| Bedfords GAS & Heating Limited | Construction | 2006 |
| Beekeeper Developments Ltd | Real estate | 2017 |
| Beetleweb Limited | Information & communication | 2006 |
| Benchwood Properties Limited | Real estate | 1978 |
| Benny Building & Maintenance Limited | Construction | 2024 |
| Bentley Slade Limited | Construction | 1984 |
| Berg 68 Ltd | Wholesale & retail | 2024 |
| Betaweb Computing Limited | Information & communication | 1997 |
| Bicknell Business Advisers Limited | Information & communication | 2006 |
| Big Apple Entertainments Limited | Arts & recreation | 2006 |
| Binks U.K. Limited | Manufacturing | 2011 |
| Bistech Managed Services Ltd | Extraterritorial | 1999 |
| Bistech PLC | Information & communication | 1988 |
| BIT Thirsty Ltd | Wholesale & retail | 2024 |
| BKP Traders Ltd | Wholesale & retail | 2013 |
| Blackmore Limited | Manufacturing | 1996 |
| Blackmore Vale Farm Cream Limited | Manufacturing | 1958 |
| Blandford Beer Company Limited | Extraterritorial | 1962 |
| Blandford Curry Limited | Hospitality | 2007 |
| Blandford Launderette Limited | Other services | 2002 |
| Blandford ST. Mary (Homes) Limited | Professional & scientific | 2002 |
| Blaq Pearl Limited | Wholesale & retail | 2022 |
| Blue Sky Employee Trustee Limited | Extraterritorial | 2022 |
| Blue Sports Limited | Professional & scientific | 2002 |
| Bluebay Properties Limited | Real estate | 1999 |
| Body Rock Ltd | Education | 2005 |
| Bombay Trees Limited | Hospitality | 2019 |
| Boreham Road Residences Limited | Extraterritorial | 2007 |
| Boschen Limited | Wholesale & retail | 2002 |
| Bourne Holdings | Real estate | 1936 |
| Bourne Steel Ltd | Construction | 2006 |
| Bourne Structures Limited | Construction | 2006 |
| Bourne Valley Denture Laboratory Limited | Health & social care | 2006 |
| Bournemouth Airport Fuel Services Limited | Transport & logistics | 2025 |
| Bournemouth Blind Society | Health & social care | 2006 |
| Bournemouth Boating Services Ltd | Transport & logistics | 2003 |
| Bournemouth Car Care Centre Limited | Wholesale & retail | 1962 |
| Bournemouth Conveyancers Limited | Professional & scientific | 1984 |
| Bournemouth Decorating Services Ltd | Construction | 2007 |
| Bournemouth Electrical Services Limited | Construction | 2002 |
| Bournemouth Noodle Bar Fusion Food Limited | Hospitality | 2018 |
| Bournemouth Services Ltd | Wholesale & retail | 2023 |
| Bournemouth Windows and Conservatories Limited | Construction | 2007 |
| Bournemouth Young Men's Christian Association | Hospitality | 1999 |
| Bradburne 6 Management Limited | Households | 1993 |
| Bradley Steel & Aggregates Limited | Construction | 2006 |
| Brandon Developments Limited | Real estate | 1978 |
| Branksome Park Association Limited(The) | Real estate | 1981 |
| Branksome Towers Flatowners' Association (Block C) Limited | Households | 1985 |
| Branksome Towers Flatowners' Association (Block D) Limited | Households | 1985 |