| Brooks Electrical Services Ltd. | Construction | 1998 |
| Brookville Developments Limited | Construction | 2005 |
| Brothers Services Solution Ltd | Construction | 2016 |
| Broughton Grounds Management Limited | Households | 2012 |
| Broughton Grounds Management Two Limited | Households | 2013 |
| Brown Property Investments Limited | Real estate | 2019 |
| Brown's Systems Ltd | Professional & scientific | 2019 |
| Broxbourne Plant Limited | Construction | 1991 |
| BRS Food Ltd | Hospitality | 2019 |
| Bruhn Newtech Limited | Information & communication | 1997 |
| Brunel Strategies Limited | Construction | 2012 |
| Bruntcliffe Chapel Management Company Limited | Households | 2006 |
| Brushwood Media Co Limited | Professional & scientific | 2021 |
| Bryn Parry Designs Limited | Professional & scientific | 2015 |
| Brystone Limited | Wholesale & retail | 2010 |
| BSA Bodyrepairs Limited | Wholesale & retail | 2009 |
| BSC & Partners Ltd | Information & communication | 2019 |
| BSC Engineering Services Limited | Wholesale & retail | 1991 |
| BSE One Limited | Professional & scientific | 2022 |
| BSE Two Limited | Professional & scientific | 2022 |
| Btgs Club Limited | Arts & recreation | 2023 |
| BTP Collection Ltd | Wholesale & retail | 2026 |
| BTR Vapour Blasting Ltd | Manufacturing | 2021 |
| BTW Jack Ltd | Information & communication | 2025 |
| BTY One & SON Limited | Administrative & support | 2026 |
| Bubbaloo Limited | Other services | 2024 |
| Buchlew Properties Limited | Real estate | 1962 |
| Buckholt Building and Maintenance Services Limited | Construction | 2012 |
| Buckholt Stables Limited | Other services | 2025 |
| Buckingham Road Property Management Limited | Households | 2004 |
| Buckleys (Southern) Limited | Professional & scientific | 2014 |
| Budd Properties Limited | Real estate | 2021 |
| Buddens Management Services Limited | Real estate | 1947 |
| Budworth Adventures Ltd | Public administration | 2016 |
| Buer Group Ltd | Information & communication | 2015 |
| Build IT New Forest Limited | Construction | 2014 |
| Build Tomorrow's Home Today Ltd | Financial services | 2019 |
| Bula Lighthouse Ltd | Construction | 2026 |
| Bulbridge Farm Management Company Limited | Real estate | 2012 |
| Bulford Food Limited | Hospitality | 2025 |
| Bulford Road Food Limited | Hospitality | 2026 |
| Bulford Store Limited | Wholesale & retail | 2019 |
| Bull Shack Ltd | Hospitality | 2025 |
| Bunyan Crescent Management Company Limited | Households | 2006 |
| Bureika & Co Limited | Hospitality | 2015 |
| Burgate Consultancy Limited | Financial services | 2011 |
| Burghley Hall Management Company Limited | Households | 1995 |
| Burlen Fuel Systems Limited | Extraterritorial | 2011 |
| Burlen Group Holdings Limited | Financial services | 2014 |
| Burlen Limited | Manufacturing | 1986 |
| Burlington Financial Consulting Limited | Professional & scientific | 2026 |
| Burlington Yachts Ltd. | Transport & logistics | 2008 |
| Burning Petals Music Limited | Information & communication | 1999 |
| Burnt Rome Consulting Limited | Professional & scientific | 2022 |
| Burroughs Accounting Ltd | Professional & scientific | 2013 |
| Burton Farm Services Limited | Professional & scientific | 2008 |
| Busamy Foods Ltd | Wholesale & retail | 2025 |
| Busexpress Ltd | Transport & logistics | 2019 |
| Bushmont Ltd | Professional & scientific | 2026 |
| Bushnell & Burrow Ltd | Construction | 2021 |
| Business Mentoring Services Ltd | Professional & scientific | 2011 |
| Business Merchandise & Marketing Limited | Wholesale & retail | 2007 |
| Business Success Global Limited | Professional & scientific | 2014 |
| Business Support Matters Limited | Professional & scientific | 2007 |
| Butcher Houses Limited | Real estate | 2017 |
| Butcher Investment Limited | Professional & scientific | 2014 |
| Butson and Norrington Limited | Real estate | 2014 |
| Butterflies & Floss Ltd | Health & social care | 2025 |
| Butterfly CGI Ltd | Manufacturing | 2022 |
| Buttery Restaurants Ltd | Hospitality | 2014 |
| BVC Management Company (Salisbury) Limited | Real estate | 2017 |
| BW Paint Spraying Limited | Construction | 2024 |
| Bwhite Services Limited | Professional & scientific | 2013 |
| BY Parents for Children Limited | Information & communication | 2008 |
| Bybrook Agriculture Limited | Agriculture & fishing | 1985 |
| Bysshop Meadow Management Company Limited | Households | 2012 |
| C & D Bright Light Properties Ltd | Households | 2019 |
| C & D Garage Services Limited | Administrative & support | 2011 |
| C & K Ricketts Ltd | Extraterritorial | 2005 |
| C & R Burt Limited | Administrative & support | 1997 |
| C B Domestics Limited | Manufacturing | 2011 |
| C Boxall Carpentry Limited | Construction | 2011 |
| C C M a Properties LLP | | 2016 |
| C D S Groundworks Ltd | Construction | 2017 |
| C H Property Trustee Gmsrbs Limited | Financial services | 2015 |
| C Hill Projects Limited | Construction | 2023 |
| C P Thorneycroft Ltd | Construction | 2004 |
| C S Commodity Solutions (Group) Limited | Financial services | 2018 |
| C S Commodity Solutions Limited | Agriculture & fishing | 2002 |
| C Snell Roofing Specialist Limited | Construction | 2010 |
| C Tipisca Ltd | Transport & logistics | 2018 |
| C&D Fine Art Limited | Information & communication | 2024 |
| C&G Power Services Ltd | Construction | 2021 |
| C&G Property Services Ltd | Real estate | 2025 |
| C&V Home Inprovements Ltd | Construction | 2026 |
| C.A. Church Limited | Professional & scientific | 1964 |
| C.Bialek Limited | Water & waste | 1962 |
| C.I. Systems Limited | Information & communication | 1968 |
| C.I.Electronics Limited | Financial services | 2024 |
| C.J.G Services Ltd | Administrative & support | 2018 |