| Bradbury's Ground Maintenance Ltd | Administrative & support | 2024 |
| Bradecca Restaurants Limited | Hospitality | 2001 |
| Bradeley Community Centre Limited | Arts & recreation | 2012 |
| Bradeley Village Company Limited | Hospitality | 1997 |
| Bradshaw Crane & Commercial Services Limited | Manufacturing | 2023 |
| Bradshaw Roofing Ltd | Construction | 2019 |
| Brahmas Developments Limited | Real estate | 2024 |
| Brainiacs Consulting Limited | Wholesale & retail | 2023 |
| Brainsoft Limited | Information & communication | 2017 |
| Bramall & Jones VW Ltd | Wholesale & retail | 2008 |
| Bramble and Bear Pet Care Ltd | Professional & scientific | 2021 |
| Bramshall Services Limited | Manufacturing | 2011 |
| Bramshall Vets Ltd | Professional & scientific | 2026 |
| Brand Hawk Ltd | Wholesale & retail | 2022 |
| Brand Pulse Ltd | Information & communication | 2025 |
| Brandflu Limited | Information & communication | 2024 |
| Brandily Limited | Wholesale & retail | 2024 |
| Brandrich Ltd | Hospitality | 2025 |
| Brands YOU Love Limited | Wholesale & retail | 2025 |
| Brannen Insights Group Ltd | Professional & scientific | 2026 |
| Brassington & Jackson Limited | Professional & scientific | 2021 |
| Brassington Brothers Limited | Wholesale & retail | 1928 |
| Brassington Estates Limited | Real estate | 2016 |
| Brave Kebab Ltd | Hospitality | 2023 |
| Brave Labels Ltd | Wholesale & retail | 2019 |
| Bravo Property Holdings Ltd | Real estate | 2024 |
| Bravo Specialist Cleaning Ltd | Administrative & support | 2010 |
| Brayford Roofing Ltd | Construction | 2005 |
| Brayford Solicitors Limited | Professional & scientific | 2012 |
| BRC Stoke Ltd | Wholesale & retail | 2025 |
| BRD Solution Ltd | Transport & logistics | 2022 |
| Breakfast SOT Limited | Hospitality | 2026 |
| Breakthrough 777 Limited | Administrative & support | 2008 |
| Breakthru' Support Services C.I.C. | Health & social care | 2020 |
| Breamfield Limited | | 1983 |
| Breathe Life Arts CIC | Arts & recreation | 2023 |
| Breathe New Life Church | Other services | 2009 |
| Breathe UK Training C.I.C. | Arts & recreation | 2013 |
| Breckland Solutions Limited | Wholesale & retail | 2017 |
| Breconn Ltd | Wholesale & retail | 2025 |
| Breeze Associates Ltd | Households | 2025 |
| Breeze Vapes Ltd | Wholesale & retail | 2025 |
| Brenda Kaloo Ltd | Information & communication | 2026 |
| Brenden Fern Limited | Construction | 2002 |
| Brennan's Driving Ltd | Education | 2025 |
| Brett Simmonds Windows Doors Conservatories Limited | Construction | 2014 |
| Brewdaddy Consulting Limited | Professional & scientific | 2024 |
| Brewery Support Limited | Professional & scientific | 2007 |
| Brews UP Ltd | Hospitality | 2019 |
| Brian Drake Supply Chain Consulting and Project Management Ltd | Information & communication | 2011 |
| Brian Shaw Transport Ltd | Transport & logistics | 2015 |
| Bricklaid Limited | Construction | 2020 |
| Brickstown Construction Limited | Construction | 2020 |
| Bridal Hack Ltd | Wholesale & retail | 2025 |
| Bridgemere Distribution Limited | Transport & logistics | 2025 |
| Bridgewater Pottery Limited | Extraterritorial | 1986 |
| Bridgewood Brickwork Ltd | Construction | 2015 |
| Bridgeworks Community CIC | Professional & scientific | 2026 |
| Bridgwood Wedding Photography Limited | Professional & scientific | 2014 |
| Bridle Ridge Properties Ltd | Real estate | 2021 |
| Brieryhurst Limited | Administrative & support | 2018 |
| Bright Beginnings Residential Care Ltd | Health & social care | 2025 |
| Bright Electrical and Baths Ltd | Construction | 2025 |
| Bright Fair Limited | Real estate | 2018 |
| Bright Green Energy Solutions Limited | Wholesale & retail | 2012 |
| Bright Green Learning Ltd | Education | 2010 |
| Bright Idea Group Limited | Manufacturing | 2019 |
| Bright Move Limited | Real estate | 2019 |
| Bright Pharma Ltd | Wholesale & retail | 2022 |
| Brightburn Solutions Ltd | Construction | 2024 |
| Brightcraft Solutions Ltd | Manufacturing | 2025 |
| Brighter Avenue Consulting Limited | Professional & scientific | 2008 |
| Brighter Telecoms Ltd | Information & communication | 2019 |
| Brighthaven Limited | Professional & scientific | 2002 |
| Brilliant Bamboo CIC | Agriculture & fishing | 2023 |
| Brilliant Finance Limited | Administrative & support | 2005 |
| Brilliant Floor Ltd | Construction | 2014 |
| Brit Secure Services (BSS) Ltd | Administrative & support | 2017 |
| Britannia Park IND EST Management Co Ltd | Real estate | 2024 |
| Britannia Recovery Limited | Transport & logistics | 2024 |
| Britannia Residential Properties Ltd | Real estate | 2012 |
| Britannia Safety Solutions Limited | Professional & scientific | 2017 |
| Britcivils Limited | Construction | 2025 |
| Britisans Ltd | Manufacturing | 2018 |
| British Ceramic Confederation Ltd | Other services | 2019 |
| Britmove Logistics Limited | Transport & logistics | 2025 |
| Britrade Co.Global Ltd | Wholesale & retail | 2024 |
| Britshine Ltd | Administrative & support | 2025 |
| Britsupplies Limited | Manufacturing | 2021 |
| Brittain Properties and Developments Limited | Real estate | 2020 |
| Brittonhall Construction Ltd | Construction | 2013 |
| Broad Hayes Park Homes Limited | Hospitality | 2004 |
| Broad Horizons Consulting Services Ltd | Professional & scientific | 2025 |
| Broad Oak Events Limited | Extraterritorial | 2019 |
| Broad Oak KM Limited | Financial services | 2013 |
| Broad Oak Management Services Limited | Construction | 2017 |
| Broad Visions Technologies Ltd | Information & communication | 2018 |
| Broadcrown Holdings Limited | Manufacturing | 1997 |
| Brocock Limited | Manufacturing | 2013 |
| Broderik Engineering UK Limited | Manufacturing | 2014 |