| Beswick Resources Ltd | Health & social care | 2002 |
| Betterbuild Homes Limited | Construction | 2018 |
| Bevan Group Ltd | Manufacturing | 1988 |
| Bevan Motor Bodies Limited | Manufacturing | 1986 |
| Bevis Investments Limited | Households | 2019 |
| Bevl Limited | Information & communication | 2019 |
| Beyond Halo Limited | Other services | 2021 |
| BF Store Ltd | Wholesale & retail | 2021 |
| BGP Education Consultancy Ltd | Professional & scientific | 2021 |
| BGS M&E Consulting Limited | Professional & scientific | 2019 |
| Bhandari Niwas UK Ltd | Real estate | 2024 |
| Biaren Limited | Wholesale & retail | 2022 |
| Bicon Rattler Ltd | Extraterritorial | 2020 |
| Big Bull Gears Ltd | Wholesale & retail | 2020 |
| Big Think Consultancy Ltd | Information & communication | 2016 |
| Bigland Building Contractors Limited | Manufacturing | 2018 |
| Bilberry Chase Residents Management Company Limited | Households | 2016 |
| Billingham Properties Ltd | Real estate | 2025 |
| BIM Solutions Limited | Information & communication | 2015 |
| BIO Clean Jetting Limited | Administrative & support | 2010 |
| Biorescue Ltd | Water & waste | 2023 |
| Biospear Limited | Extraterritorial | 2015 |
| Birmingham Grab Hire and Aggregates Ltd | Water & waste | 2019 |
| Birmingham Health, Safety and Environment Association | Other services | 1968 |
| Birmingham International Jazz Festival Limited | Arts & recreation | 1988 |
| Birmingham Landscape Plants & Flowers Limited | Wholesale & retail | 2019 |
| Birmingham Mount Co Ltd | Wholesale & retail | 2013 |
| Birmingham School of Management Ltd | Professional & scientific | 2025 |
| Bishop Fields (Hereford) Management Company Limited | Households | 2016 |
| Bitmash Limited | Information & communication | 2016 |
| BJG Associates Limited | Administrative & support | 2001 |
| Black Country Builders Ltd | Construction | 2016 |
| Black Country Business Consultants Limited | Professional & scientific | 2005 |
| Black Country Colleges Ltd | Education | 2003 |
| Black Country Companions Ltd | Health & social care | 2025 |
| Black Country Fairs Ltd | Administrative & support | 2026 |
| Black Country Hardware Limited | Wholesale & retail | 2016 |
| Black Country Legal Services Limited | Professional & scientific | 2009 |
| Black Country Mentoring Ltd | Education | 2025 |
| Black Country Metals Trading Limited | Wholesale & retail | 2012 |
| Black Country Retail Group Ltd | Hospitality | 2026 |
| Black Country Signs Limited | Manufacturing | 2016 |
| Black Country T-Shirts Ltd | Wholesale & retail | 2014 |
| Black Hawk Homes Ltd | Construction | 2016 |
| Blackcountry Group of Companies Limited | Professional & scientific | 2013 |
| Blackford Bookkeeping Ltd | Professional & scientific | 2024 |
| Blackford Virtual Ltd | Professional & scientific | 2026 |
| Blackheath Foods Limited | Wholesale & retail | 2018 |
| Blackheath Group EOT Limited | Administrative & support | 2023 |
| Blackheath WM CIC | Hospitality | 2026 |
| Blackthorne Recruitment Limited | Administrative & support | 2020 |
| Blade Property Ltd | Real estate | 2024 |
| Blakedown Investments Ltd | Real estate | 2019 |
| Blakes Landscaping Limited | Administrative & support | 2022 |
| Bland Ventures Ltd | Real estate | 2024 |
| Blaze Vintage Ltd | Health & social care | 2023 |
| Blenheim Partners Limited | Professional & scientific | 2012 |
| Blenheim Watch Limited | Wholesale & retail | 2015 |
| BLH Fitness Limited | Arts & recreation | 2020 |
| BLN Investments Limited | Real estate | 2019 |
| Bloom Training Ltd | Education | 2026 |
| Bloore King and Kavanagh Limited | Administrative & support | 2018 |
| Blue Buoy Brixham Ltd | Real estate | 2022 |
| Blue Chilli Marketing Limited | Professional & scientific | 2006 |
| Blue Flame Energy Solutions Ltd | Manufacturing | 2010 |
| Blue Rock Procurement Ltd | Administrative & support | 2025 |
| Blue Rose Transport Ltd | Transport & logistics | 2025 |
| Blue Stone Business Solutions Limited | Information & communication | 2003 |
| Bluebase Group Holdings Ltd | Financial services | 2024 |
| Bluebase Investments Limited | Financial services | 2021 |
| Bluerocklending Ltd | Financial services | 2025 |
| Blythe Phillips Limited | Professional & scientific | 2009 |
| Bobbleside Limited | Hospitality | 1996 |
| Body Mind Collective CIC | Other services | 2023 |
| Bodyburn Hybrid Fitness Ltd | Arts & recreation | 2025 |
| Bompani (UK) Limited | Wholesale & retail | 2000 |
| Border Software Limited | Information & communication | 2000 |
| Boss UP Professional Services Limited | Professional & scientific | 2024 |
| Boujee Nail Club Limited | Other services | 2025 |
| Bourbon Street Kitchen Catering Limited | Hospitality | 2018 |
| Bourne & Co. Property Holdings Limited | Real estate | 2025 |
| BOW and Co Group Ltd | Professional & scientific | 2025 |
| BPN a Limited | Financial services | 2026 |
| BPO Accountants Ltd | Professional & scientific | 2023 |
| Bracebridge Trading Ltd | Real estate | 2025 |
| Brachot Limited | Wholesale & retail | 2000 |
| Bracken Contract Services Limited | Administrative & support | 2006 |
| Bradley's General Haulage Limited | Transport & logistics | 2009 |
| Bradmoore Property Development Limited | Real estate | 2002 |
| Brandset Holdings Limited | Financial services | 2021 |
| Brandset Limited | Professional & scientific | 1989 |
| Branscan Limited | Information & communication | 2001 |
| Brass Property Holdings Ltd | Real estate | 2025 |
| Breakinginboxes Ltd | Wholesale & retail | 2025 |
| Bredon Retail Limited | Wholesale & retail | 2013 |
| Bredon Stores Limited | Wholesale & retail | 2015 |
| Brennand 1968 Limited | Extraterritorial | 2015 |
| Bridal-Whispers Limited | Wholesale & retail | 2025 |
| Bridge Robotics Limited | Information & communication | 2018 |
| Bridge Street UK MOT Ltd | Manufacturing | 2023 |