| Brightsparks Education Inc Ltd | Education | 2026 |
| Brightstair Ltd | Transport & logistics | 2021 |
| Brightstone Housing Limited | Real estate | 2026 |
| Brinkshelf 214 Limited | Households | 1996 |
| British Blind Sport | Arts & recreation | 2016 |
| British Limousin Cattle Society Limited | Agriculture & fishing | 1970 |
| British OIL Security Syndicate Limited | Other services | 2005 |
| British Pregnancy Advisory Service | Health & social care | 1984 |
| Britnell Holdings Limited | Financial services | 2021 |
| Britnell Holdings Manchester Ltd | Real estate | 2022 |
| Brits Online Developments Ltd | Information & communication | 2020 |
| Brixton Yoga Project Ltd | Education | 2022 |
| Broad Street (Warwick) Limited | Households | 1988 |
| Brockencote Hall Hotel Limited | Hospitality | 1985 |
| Brokesley Woodcote Limited | Professional & scientific | 2023 |
| Bronze Nova Limited | Information & communication | 2023 |
| Brookwood Accountants Ltd | Professional & scientific | 2013 |
| Brow Face Ltd | Other services | 2025 |
| Brown Family Developments Ltd | Financial services | 2024 |
| Brownian Labs Ltd | Professional & scientific | 2025 |
| Browyard Limited | Households | 1984 |
| Brubl Brewery Ltd | Manufacturing | 2026 |
| Brunel Bars Limited | Hospitality | 2012 |
| Brut & Barrel Ltd | Hospitality | 2025 |
| BS Bhandal Limited | Health & social care | 2017 |
| BS Cosmetic Surgery Ltd | Health & social care | 2021 |
| BSA Care Service Limited | Public administration | 2025 |
| BSB Financial Services Limited | Financial services | 2014 |
| BSC Clinical Solutions Ltd | Health & social care | 2017 |
| BTA Multi Services Ltd | Information & communication | 2020 |
| BTC Academy Ltd. | Health & social care | 2016 |
| BTG Property Ltd | Real estate | 2020 |
| BTH Property Solutions Ltd | Construction | 2025 |
| Btoa Properties Ltd | Real estate | 2025 |
| Bubble TUB Hire Ltd | Extraterritorial | 2021 |
| Buck Care Limited | Hospitality | 2022 |
| Bugiworkshop Ltd | Wholesale & retail | 2025 |
| Build Direct Supplies Ltd | Wholesale & retail | 2025 |
| Build Intellect Limited | Information & communication | 2015 |
| Build IT Green Limited | Construction | 2020 |
| Build UP (Station Road) Ltd | Real estate | 2025 |
| Building and Plumbing Supplies Limited | Wholesale & retail | 1934 |
| Building Arts Community Interest Company | Administrative & support | 2009 |
| Building Integral Support Limited | Administrative & support | 2024 |
| Buildup (Canterbury) Limited | Real estate | 2025 |
| Buildup (Ebbw Vale) Ltd | Real estate | 2026 |
| Built to Thrive Ltd | Professional & scientific | 2026 |
| BUMPERS4U Limited | Wholesale & retail | 2015 |
| Bundish Hall Barns Management Company Limited | Households | 2003 |
| Bunkers Hill Estates Limited | Construction | 2008 |
| Bunn Holding and Development Limited | Construction | 2023 |
| Bunyard Electrical Solutions Ltd | Manufacturing | 2019 |
| Bunza Ltd | Hospitality | 2025 |
| Buono Cleaning Ltd | Administrative & support | 2016 |
| Burgis & Bullock Corporate Finance Limited | Professional & scientific | 2000 |
| Burgis & Bullock Limited | Professional & scientific | 1998 |
| Burst Consulting Ltd | Information & communication | 2024 |
| Busbus Ltd | Transport & logistics | 2025 |
| Busby Holdings Ltd | Professional & scientific | 2021 |
| Business Data Specialist Ltd | Information & communication | 2019 |
| Business Recovery Specialists Limited | Professional & scientific | 2015 |
| Button Consultants Limited | Administrative & support | 2009 |
| Buxton Property Consultancy Limited | Real estate | 2020 |
| BV Region Limited | Financial services | 2019 |
| Bvdfree | Professional & scientific | 2016 |
| BW93 Engineering Limited | Administrative & support | 2024 |
| BWP Midlands Ltd | Real estate | 2024 |
| BY TOM Bird Limited | Professional & scientific | 2023 |
| Bydo Trading Ltd | Wholesale & retail | 2020 |
| BYE by ME Ltd | Extraterritorial | 2013 |
| Byte Product Management Consulting Ltd | Professional & scientific | 2026 |
| C & C Data & Electrical Limited | Information & communication | 2019 |
| C & R Power Limited | Construction | 2015 |
| C and S Design Management Import Ltd | Wholesale & retail | 2017 |
| C C Executive Solutions Limited | Professional & scientific | 2024 |
| C Hope Property Ltd | Financial services | 2026 |
| C J Hutt Associates Limited | Other services | 2008 |
| C M Rooke Limited | Hospitality | 2019 |
| C&R Property & Lettings Limited | Real estate | 2024 |
| C. Barber Limited | Professional & scientific | 2004 |
| C. J. Briggs Ltd | Construction | 2012 |
| C.B. Auto Repairs Limited | Wholesale & retail | 2013 |
| C.O Associates Limited | Health & social care | 2022 |
| C.R.D.S. Limited | Manufacturing | 2004 |
| C2P Conception to Perfection Ltd | Professional & scientific | 2019 |
| C3B Design Limited | Professional & scientific | 2014 |
| C54 Limited | Arts & recreation | 2026 |
| CAB GUY Ltd | Transport & logistics | 2026 |
| Cabld Limited | Information & communication | 2025 |
| Cad-It Solutions Ltd | Professional & scientific | 2017 |
| Cadcam Midlands Limited | Information & communication | 2011 |
| Cadence Insights Limited | Professional & scientific | 2023 |
| Cadman Print Limited | Manufacturing | 2019 |
| Cadogan House Management Limited | Real estate | 2004 |
| CAE Tech Limited | Professional & scientific | 2016 |
| Cafe 81 Catering Ltd | Hospitality | 2026 |
| Cafe Leamington Spa Limited | Hospitality | 2017 |
| CAG Couriers (Warwickshire) Limited | Transport & logistics | 2019 |
| CAG Logistics (Warwickshire) Limited | Transport & logistics | 2022 |
| Caizley Limited | Real estate | 2021 |