| Blucon Plant Limited | Administrative & support | 2011 |
| Blue (Solutions for Business) Ltd | Administrative & support | 2002 |
| Blue Beetle Productions Ltd | Education | 2014 |
| Blue Buzzard Management Ltd | Real estate | 2023 |
| Blue Door Property Developments Limited | Construction | 2020 |
| Blue Earth Travel Ltd | Transport & logistics | 2025 |
| Blue FOX Property Investments Limited | Real estate | 2023 |
| Blue Grass Ground Maintenance Limited | Administrative & support | 2013 |
| Blue Harbour Property Investment Company Ltd | Real estate | 2020 |
| Blue Horizons Holdings Ltd | Hospitality | 2025 |
| Blue Lake Hampton Limited | Real estate | 2022 |
| Blue Moon Consulting Limited | Health & social care | 2021 |
| Blue Phoenix Properties and Investments Ltd | Real estate | 2025 |
| Blue Property Services Limited | Construction | 2003 |
| Blue Rise Plumbing and Heating Ltd | Construction | 2025 |
| Blue Shore Property Ltd | Real estate | 2025 |
| Blue Sky Arboriculture Limited | Administrative & support | 2018 |
| Blue Station Communications Limited | Professional & scientific | 2003 |
| Blue Streak FX Ltd | Financial services | 2026 |
| Blue Vale Developments Ltd | Construction | 2021 |
| Bluebell Safety Training UK Limited | Administrative & support | 2024 |
| Bluebird Recruitment Ltd | Administrative & support | 2017 |
| Bluebird Welfare Ltd | Households | 2026 |
| Blueboard Solutions Ltd | Professional & scientific | 2023 |
| Blueboo UK Ltd | Hospitality | 2014 |
| Bluegrass Landscapes Limited | Construction | 2004 |
| Bluejay Game Studios Ltd | Wholesale & retail | 2024 |
| Bluenile (Raucby) Limited | Transport & logistics | 2021 |
| Blueprint Sport Consulting Limited | Professional & scientific | 2024 |
| Bluestones Property Limited | Real estate | 2006 |
| Bluestream Technology Services Limited | Professional & scientific | 2007 |
| Bluetide Consulting Ltd | Information & communication | 2017 |
| Bluezone Fitness Limited | Other services | 2025 |
| Blufocus Solutions Ltd | Information & communication | 2025 |
| Blush X Bronze Studios Limited | Other services | 2026 |
| Blythe Consulting Services Ltd | Professional & scientific | 2020 |
| Blythe Manor Cards Limited | Wholesale & retail | 2003 |
| Blythe Real Estate Limited | Real estate | 2022 |
| Blythe Valley Services Limited | Administrative & support | 2018 |
| Blythe Way Developments Limited | Real estate | 2017 |
| Blythwood Management Company Limited | Households | 2018 |
| BM Insulations Limited | Construction | 2020 |
| BM Rothwell Limited | Real estate | 2024 |
| Bmac Actuarial Consulting Ltd | Professional & scientific | 2023 |
| BMC Pro Ltd | Wholesale & retail | 2024 |
| BMD Cycle Repairs Ltd | Manufacturing | 2024 |
| BMO Investments Limited | Real estate | 2019 |
| BMS Techhub Ltd | Information & communication | 2025 |
| Bmtl Logistics Ltd | Transport & logistics | 2023 |
| BMZ Services Limited | Real estate | 2016 |
| BNA Engineering Ltd | Construction | 2018 |
| BNK SYS Ltd | Information & communication | 2026 |
| Boardroom Club Consulting Ltd | Professional & scientific | 2020 |
| BOB Dilworth Design Limited | Professional & scientific | 2002 |
| Bob's Glazing Limited | Construction | 2012 |
| Bodgit Engineering Limited | Professional & scientific | 2014 |
| Bodlior Investment Ltd | Real estate | 2018 |
| Bodlior Limited | Health & social care | 2015 |
| Bogue Properties Limited | Real estate | 2014 |
| Boho Bakehouse Limited | Hospitality | 2023 |
| Bold & Fortune Ltd | Real estate | 2021 |
| Bold Sports Management Ltd | Professional & scientific | 2012 |
| Boldbridge Ventures Ltd | Manufacturing | 2024 |
| Bonafide Care Ltd | Public administration | 2023 |
| Bond Commercial Investments Limited | Real estate | 2026 |
| BOO BOO Bars Limited | Hospitality | 2020 |
| Boo-Chic Beauty Ltd | Other services | 2023 |
| Booga Limited | Wholesale & retail | 2003 |
| Booster Town Ltd | Wholesale & retail | 2025 |
| Boot Properties LLP | | 2008 |
| Booth Developments Limited | Construction | 2016 |
| Booth Land Limited | Agriculture & fishing | 2014 |
| Bopala Ltd | Professional & scientific | 2022 |
| Bora Coffee Limited | Hospitality | 2021 |
| Bora Ventures Limited | Wholesale & retail | 2018 |
| Boraq Electrical Solutions Ltd | Construction | 2022 |
| Borderless Education Services Ltd | Education | 2024 |
| Bordesley Green Homes Ltd | Other services | 2012 |
| Bordesley Plant Hire Ltd | Professional & scientific | 2002 |
| Bordesley Plant Hires Ltd | Professional & scientific | 2002 |
| Borghese Limited | Real estate | 2023 |
| Born in Brum Limited | Manufacturing | 2025 |
| Boroughbridge Homes Limited | Real estate | 1997 |
| Bosh Boxing Ltd | Education | 2020 |
| Boss Mart 2 Ltd | Wholesale & retail | 2025 |
| Boss Mart 3 Ltd | Wholesale & retail | 2023 |
| Boss Mart SR3 Ltd | Wholesale & retail | 2026 |
| Bostin Limited | Professional & scientific | 2010 |
| Boston Blue Properties Ltd | Real estate | 2026 |
| Boston Consultants Limited | Professional & scientific | 2000 |
| Boswell Industries Limited | Wholesale & retail | 2025 |
| Bosworth Consultants Limited | Real estate | 1999 |
| Bosworth Wood Community Day Nursery CIC | Health & social care | 2021 |
| Botterill Holdings Limited | Financial services | 2023 |
| Botterill Investments Limited | Financial services | 2023 |
| Bottles Reborn Ltd | Water & waste | 2025 |
| Bottrill Holdings Ltd | Real estate | 2026 |
| Bouden Prime Real Estate Ltd | Real estate | 2024 |
| Boughton Engineering Limited | Manufacturing | 1999 |
| Bounce and Balloons 4 U Ltd | Administrative & support | 2025 |