| Box Tree Music Limited | Extraterritorial | 1993 |
| Boxing King Media Ltd | Information & communication | 2019 |
| Boxlot Ltd | Wholesale & retail | 2023 |
| Boxsafe Mentorship Ltd | Education | 2024 |
| Boxtalk Ltd | Real estate | 2021 |
| BOY WHO Fell to Earth Music Ltd | Arts & recreation | 2026 |
| Bphr Property Ltd | Real estate | 2020 |
| BPR Design Ltd | Other services | 2022 |
| Bpreece Property Ltd | Financial services | 2025 |
| BR Convenience Limited | Wholesale & retail | 2017 |
| Bracken Administration Services Ltd | Administrative & support | 2025 |
| Bradbury Construction Ltd | Construction | 2022 |
| Bradbury Healthcare Ltd | Wholesale & retail | 2023 |
| Bradbury Sales Group Ltd | Wholesale & retail | 2023 |
| Bradfords LLP | | 2021 |
| Bradfords Solicitors LLP | | 2021 |
| Bradgate Motors (Rotherham) Limited | Wholesale & retail | 2012 |
| Bradgate NDT Limited | Professional & scientific | 2015 |
| Bradshaw and Co Property Partners Ltd | Real estate | 2025 |
| Bradton Property Holdings Ltd | Real estate | 2024 |
| Braithwell and Micklebring Recreation and Leisure Association Ltd | Arts & recreation | 2013 |
| Braithwell Development Ltd | Real estate | 2023 |
| Braithwell Kitchens Ltd | Construction | 2026 |
| Bralsford, Stubbs & Associates Expert Witness Services Ltd | Professional & scientific | 2019 |
| Bramely Fort Ltd | Wholesale & retail | 2024 |
| Bramley 23 Ltd | Professional & scientific | 2019 |
| Bramley Farm Limited | Agriculture & fishing | 2015 |
| Bramley Park Lettings Limited | Real estate | 2010 |
| Bramley Pizza Ltd | Hospitality | 2025 |
| Bramley Sandwich Bar Ltd | Wholesale & retail | 2024 |
| Bramley Sunnyside Juniors Football Club Limited | Extraterritorial | 2007 |
| Bramley's Independent Funeral Director Limited | Administrative & support | 2015 |
| Brammers Tiling Ltd | Construction | 2023 |
| Brampton Fixings & Fasteners Limited | Wholesale & retail | 2006 |
| Brampton LOG & Fencing Supplies Ltd | Manufacturing | 2015 |
| Brampton Manor Salon & Tea Rooms Ltd | Other services | 2013 |
| Brampton Service Station Ltd | Wholesale & retail | 2023 |
| Brams Chimney Sweeps Ltd | Administrative & support | 2024 |
| Bramthorpe Property Ltd | Real estate | 2024 |
| Branagans Accountancy Services Limited | Financial services | 2006 |
| Branaz Ltd | Wholesale & retail | 2024 |
| Branchaxis Ltd | Wholesale & retail | 2025 |
| Brand New Brand Ltd | Information & communication | 2015 |
| Brandevoo Ltd | Administrative & support | 2026 |
| Brandqas Ltd | Wholesale & retail | 2026 |
| Brashcore Limited | Construction | 2012 |
| Brave New Arts Events Ltd | Information & communication | 2011 |
| Bravium Portfolio Ltd | Administrative & support | 2023 |
| Bravium Properties Limited | Hospitality | 2014 |
| Bravo Fire Ltd | Construction | 2025 |
| Brayhart Ltd | Wholesale & retail | 2008 |
| Break-Fu Productions Ltd | Information & communication | 2025 |
| Break-Out Arts | Education | 2021 |
| Breathe Manor Farm Limited | Other services | 2023 |
| Brecks Joinery Ltd | Construction | 2017 |
| Brecks Snooker Club Ltd | Hospitality | 2019 |
| Brecks Sports and Social Club Ltd | Hospitality | 2025 |
| Bregg Olsen Ltd | Administrative & support | 2015 |
| Bremner Real Estate Limited | Real estate | 2020 |
| Brent Norris Transport Ltd | Transport & logistics | 2022 |
| Brentech Mechanical Ltd | Construction | 2024 |
| Bresset Project Management Ltd | Information & communication | 2019 |
| Briar Solutions Ltd | Information & communication | 2020 |
| Brick Cutting & Bonding Ltd | Wholesale & retail | 2012 |
| Brick N Tile Ltd | Hospitality | 2025 |
| Brick.Bazaar Ltd | Wholesale & retail | 2021 |
| Brickflow Investments Limited | Real estate | 2026 |
| Bricks N Mortar Management Ltd | Real estate | 2020 |
| BRICKS2HOUSES Ltd | Other services | 2026 |
| Brickwall Motors Limited | Wholesale & retail | 2025 |
| Brickwall Property Ltd | Real estate | 2025 |
| Bricky ROW Barbershop Ltd | Other services | 2015 |
| Bridge Bakery Express Ltd | Wholesale & retail | 2021 |
| Bridgeedge Ltd | Wholesale & retail | 2024 |
| Bridget Thorpe & Co Ltd | Extraterritorial | 2011 |
| Bridgeway Supported Living Ltd | Health & social care | 2025 |
| Brier Solutions Limited | Professional & scientific | 2017 |
| Briggs Security Ltd | Administrative & support | 2026 |
| Bright Future Property Investment Limited | Real estate | 2025 |
| Bright NDT Limited | Professional & scientific | 2026 |
| Bright Stars Play CIC | Education | 2024 |
| Brightlight Coaching & Consulting Limited | Professional & scientific | 2026 |
| Brightpick Ltd | Wholesale & retail | 2026 |
| Brimstone Properties Limited | Real estate | 2011 |
| Brindley’S Homes (Yorkshire) Ltd | Real estate | 2024 |
| Brinkleyservices Ltd | Information & communication | 2025 |
| Brinsworth Auto Centre Limited | Wholesale & retail | 2010 |
| Brinsworth Glass Ltd | Construction | 2015 |
| Brinsworth Inns Ltd | Hospitality | 2016 |
| Brinsworth Joinery Limited | Construction | 2019 |
| Brinsworth Local Mart Ltd | Wholesale & retail | 2021 |
| Brinsworth Trading Company Limited | Wholesale & retail | 2013 |
| Brinsworthmotors Ltd | Wholesale & retail | 2022 |
| Brit Secure Limited | Administrative & support | 2026 |
| Britannia Drilling Services Ltd | Construction | 2025 |
| Britannia LEV Engineering Ltd | Manufacturing | 2021 |
| Britannia Property Sales & Lettings Ltd | Real estate | 2021 |
| Britannia-Shinkyowa Traders Limited | Wholesale & retail | 2026 |
| Britannians Limited | Construction | 1981 |
| Brite Care Facilities Management Ltd | Administrative & support | 2023 |