| Boravet Ltd | Professional & scientific | 2018 |
| BOS Projects Limited | Wholesale & retail | 2025 |
| Boston Test Centre Limited | Education | 2024 |
| Botham Commercials Ltd | Wholesale & retail | 2009 |
| Bothams Architectural Design Ltd. | Professional & scientific | 2019 |
| Bottle and Thyme (Chesterfield) Ltd. | Hospitality | 2016 |
| Bottomline Security Print Limited | Manufacturing | 2005 |
| Boujee Beauty & Co Ltd | Other services | 2023 |
| Boundary Engineering Solutions Ltd | Professional & scientific | 2019 |
| BOW Window Films Ltd | Construction | 2021 |
| Bowenwilson Limited | Real estate | 2007 |
| Bowham Properties Ltd | Real estate | 2025 |
| Bowin Ltd | Real estate | 2019 |
| Bowlers Autistic Minds CIC | Education | 2025 |
| Bowman Carpentry Limited | Construction | 2018 |
| Boydens Building Restoration Limited | Water & waste | 2011 |
| BP Pilsley Ltd | Hospitality | 2026 |
| BPS Freehold Acquisitions Limited | Real estate | 2024 |
| BPS Lets Limited | Hospitality | 2025 |
| BPS Property Acquisitions Limited | Real estate | 2024 |
| BPS Property Services Limited | Administrative & support | 2025 |
| Brad-Pave Ltd. | Construction | 2013 |
| Bradbury Hall Developments Limited | Construction | 2004 |
| Bradbury Place Management Company Limited | Real estate | 2006 |
| Bradbury, Winslow Limited | Other services | 1983 |
| Bradburybrothers Ltd | Other services | 2024 |
| Bradley & Howe Financial Associates Limited | Financial services | 2003 |
| Bradley & Howe Financial Services Limited | Financial services | 2003 |
| Bradley Morrell Solicitors Limited | Professional & scientific | 2020 |
| Bradleys Cars Ltd | Wholesale & retail | 2024 |
| Brae Transport Limited | Transport & logistics | 2012 |
| Brailsford Holdings Limited | Real estate | 2019 |
| Brake Depot Limited | Wholesale & retail | 2009 |
| Bramah Investments Limited | Financial services | 2022 |
| Bramley Residences Ltd | Real estate | 2025 |
| Bramley View Residents Management Company Limited | Households | 2020 |
| Brampton Archway Limited | Administrative & support | 2008 |
| Brampton Beauty Retreat Ltd | Other services | 2019 |
| Brampton Brewery Ltd | Manufacturing | 2007 |
| Brampton Cleaning Services Ltd | Administrative & support | 2025 |
| Brampton Estates Maintenance Ltd | Water & waste | 2023 |
| Brampton Flooring Limited | Wholesale & retail | 2020 |
| Brampton Home Furnishers Limited | Wholesale & retail | 2000 |
| Brampton Laundry & Cleaning Services Ltd | Wholesale & retail | 2021 |
| Brampton PI Shop Ltd | Hospitality | 2023 |
| Brampton PUB Co. Ltd. | Hospitality | 2009 |
| Brampton Rovers Holdings Limited | Arts & recreation | 2015 |
| Brand Frank Limited | Professional & scientific | 2022 |
| Brand Runner Ltd | Wholesale & retail | 2020 |
| Brant Farm Services Limited | Wholesale & retail | 2022 |
| Brass Hanger Limited | Wholesale & retail | 2025 |
| Brassington Homes Limited | Construction | 2023 |
| Bravo Systems Limited | Professional & scientific | 2023 |
| Braybrooke Limited | Hospitality | 2019 |
| BRC Developments Limited | Construction | 2012 |
| Brearley Hall (Chesterfield) Limited | Households | 2009 |
| Breathe by JO Ltd | Manufacturing | 2021 |
| Bredent U.K. Limited | Wholesale & retail | 2004 |
| Breedon Electrical Domestic Ltd | Construction | 2024 |
| Breedon Electrical Ltd | Construction | 2024 |
| Breeze Property Ltd | Real estate | 2024 |
| Brendian Technical Limited | Professional & scientific | 2014 |
| Brew Technician UK Ltd | Manufacturing | 2025 |
| Brew-It Group Espresso Machines Ltd | Wholesale & retail | 1996 |
| Brew-It Group Ltd | Wholesale & retail | 2017 |
| Brewtique (Winsford) Ltd | Administrative & support | 2019 |
| BRH 1 Limited | Real estate | 2016 |
| BRH 2 Limited | Real estate | 2017 |
| Briarfield Investments | Other services | 2018 |
| Brick Slip Development Association Ltd | Other services | 2025 |
| Brickhill Sands Management Company Limited | Households | 2016 |
| Brickslips Direct Ltd | Wholesale & retail | 2024 |
| Brid's Limited | Transport & logistics | 2000 |
| Briddon Investments Limited | Financial services | 2025 |
| Bridge and Bloom Inclusion CIC | Administrative & support | 2025 |
| Bridge Bidco Limited | Financial services | 2020 |
| Bridge Help (NO2) Limited | Financial services | 2019 |
| Bridge Help Limited | Financial services | 2017 |
| Bridge Help Valuations Limited | Administrative & support | 2022 |
| Bridge Street Diagnostic and Service Centre Ltd | Wholesale & retail | 2023 |
| Bridgstock Boanas Enterprise and Philanthropy Limited | Other services | 2021 |
| Bridgstock Kelly Limited | Other services | 2021 |
| Bridgstock Limited | Professional & scientific | 2007 |
| Brierley Leisure Limited | Arts & recreation | 2007 |
| Bright Beginnings EEY Ltd | Health & social care | 2019 |
| Bright Line Road Markings Ltd | Construction | 2024 |
| Brightwater Properties Ltd | Real estate | 2012 |
| Brikgard Ltd | Wholesale & retail | 2022 |
| Brim Corner Ltd | Wholesale & retail | 2024 |
| Brimington Equestrian Centre Limited | Education | 2015 |
| Brimington Investments Limited | Real estate | 2009 |
| Brimington Pre-School Ltd | Education | 2024 |
| Brimington Testing Centre Limited | Wholesale & retail | 1996 |
| Brimming With Beer Ltd | Wholesale & retail | 2016 |
| Brimstone Cottage Ltd | Wholesale & retail | 2025 |
| Brindwood Properties Limited | Households | 2024 |
| Brinkley Spencer Ltd | Real estate | 2019 |
| Briq Developments Ltd | Construction | 2020 |
| Briq Furniture Ltd | Wholesale & retail | 2017 |
| Bristol Skills Academy Limited | Extraterritorial | 2020 |