| Bonniebabi Limited | Professional & scientific | 2022 |
| Bonnington Farm Limited | Agriculture & fishing | 2019 |
| Bonnymuir Ltd | Information & communication | 2026 |
| Bonthuys Ltd | Financial services | 2017 |
| Book My Home Limited | Real estate | 2017 |
| Book My Mortgage Limited | Financial services | 2017 |
| Book People Recruitment Limited | Professional & scientific | 2002 |
| Bookables Software Limited | Information & communication | 2020 |
| Bookeepers Limited | Administrative & support | 2013 |
| Bookworm Services (Ashford) Ltd | Professional & scientific | 2012 |
| Boon Edam Limited | Construction | 1985 |
| Borderpoint Films Ltd | Information & communication | 2014 |
| Borg Capital Insights Ltd | Professional & scientific | 2025 |
| Born Again Today Limited | Arts & recreation | 2023 |
| Bosch Global Associates Ltd | Administrative & support | 2013 |
| Botanical Adventures Limited | Wholesale & retail | 2017 |
| Botaniworld Ltd | Wholesale & retail | 2019 |
| Both Associates Ltd | Professional & scientific | 2013 |
| Bottled Water Direct Limited | Professional & scientific | 2009 |
| Boty Farms Limited | Agriculture & fishing | 1959 |
| Boudica IT Limited | Education | 2013 |
| Boujee Staycations Ltd | Real estate | 2024 |
| Boujee Vacays Ltd | Administrative & support | 2018 |
| Bounty Consultancy Services Ltd | Professional & scientific | 2017 |
| Bounty Pest Control Limited | Agriculture & fishing | 2024 |
| Bourne’S Sports Limited | Education | 2018 |
| Boutilliers Bars Ltd | Hospitality | 2019 |
| Boutilliers Limited | Manufacturing | 2014 |
| Bouverie News (Folkestone) Limited | Information & communication | 2010 |
| Bowberry House Design Limited | Administrative & support | 2003 |
| Bowden Heating Ltd. | Construction | 2021 |
| Bowden's Homes Limited | Real estate | 2023 |
| Bowenhurst Golf Centre Limited | Arts & recreation | 1992 |
| Bower Farm Developments Limited | Construction | 2020 |
| Bower Farm Property Management Limited | Households | 2023 |
| Bower Terrace Apartments Limited | Real estate | 2024 |
| Bowley Farm Limited | Agriculture & fishing | 2020 |
| Bowltech (UK) Limited | Arts & recreation | 1996 |
| Bows Bridal Boutique Limited | Wholesale & retail | 2014 |
| Bows Suit Hire Limited | Wholesale & retail | 2014 |
| Boxguard Ltd | Manufacturing | 2025 |
| Boyce Care Ltd | Health & social care | 2007 |
| Boyla Ltd | Construction | 2024 |
| Bp&Bp Limited | Real estate | 2025 |
| BPC Consultancy Ltd | Professional & scientific | 2025 |
| Bpes (Holdings) Ltd | Financial services | 2021 |
| BPL - the Business Partnership Ltd. | Professional & scientific | 2002 |
| BPS Paving Ltd | Administrative & support | 2022 |
| BPV (Brewin Property Ventures) Ltd | Real estate | 2018 |
| Brabourne Management Consultancy Ltd | Administrative & support | 2010 |
| Brackenridge Consultancy Ltd | Professional & scientific | 2016 |
| Bracknell Glass Limited | Construction | 2003 |
| Bracon International Ltd | Professional & scientific | 2015 |
| Bracur Properties Limited | Real estate | 2008 |
| Bradley Bishop Ltd | Real estate | 2011 |
| Bradshaw Group Limited | Health & social care | 2025 |
| Braeburn Management Limited | Real estate | 2013 |
| Braeside Commercial Ltd | Construction | 2019 |
| Braeside Farm Ltd | Real estate | 2025 |
| Brai, MOR Ltd | Wholesale & retail | 2019 |
| Braid Farm Park Limited | Hospitality | 2019 |
| Brain & Solution International Ltd | Professional & scientific | 2021 |
| Brain Brand Ltd | Wholesale & retail | 2024 |
| Braingain Limited | Wholesale & retail | 2020 |
| Brains & Passion Ltd | Information & communication | 2026 |
| Braithwaite Constance Ltd | Financial services | 2024 |
| Brake Bros Foodservice Limited | Wholesale & retail | 1961 |
| Brakes Pension Trustee Limited | Financial services | 2015 |
| Bramble & Holly Ltd | Professional & scientific | 2013 |
| Brambledown Residential Management Company Limited | Households | 2022 |
| Brambles Care Limited | Health & social care | 2015 |
| Bramhall Developments Limited | Construction | 2015 |
| Bramley Mount Fruit Drying Limited | Manufacturing | 2008 |
| Bramling Estates Limited | Real estate | 2017 |
| Bramling Workshops Limited | Financial services | 2023 |
| Branch Sustains Ltd | Water & waste | 2024 |
| Brand Plan Media LLP | | 2011 |
| Brand YOU Consulting LLP | | 2023 |
| Brandonbs Limited | Information & communication | 2024 |
| Brandspace Media Ltd | Professional & scientific | 2019 |
| Branton Buildings and Fabrications Ltd | Construction | 2025 |
| Bravestar Limited | Real estate | 1988 |
| BRC Plumbing and Heating Services Ltd | Construction | 2024 |
| Brcp Ltd | Wholesale & retail | 2024 |
| Breathing Soul Ltd | Wholesale & retail | 2022 |
| Breen Construction Services Limited | Construction | 2006 |
| Breeze Gym Ltd | Arts & recreation | 2026 |
| Brenchmark Limited | Professional & scientific | 2025 |
| Brent Sparks Limited | Construction | 2013 |
| Brett Engineering Surveying Ltd | Professional & scientific | 2009 |
| Brewis Developments Ltd | Real estate | 2025 |
| Brewis Renovations Ltd | Real estate | 2024 |
| BRI Lease Limited | Hospitality | 2010 |
| Brian Davis Racing Classic and Sports Cars Limited | Wholesale & retail | 2021 |
| Brian Page and Associates Limited | Professional & scientific | 2000 |
| Brian Price Building Contracts Limited | Construction | 2018 |
| Brichester Property Limited | Real estate | 2020 |
| Brichester Psychology Limited | Health & social care | 2022 |
| Bricklow Property Management Limited | Hospitality | 2003 |
| Brickwork S.E Ltd | Construction | 2016 |