| Better Days School Improvement Ltd | Education | 2022 |
| Betterona Ltd | Wholesale & retail | 2025 |
| BFA Safety Training Limited | Education | 1999 |
| Bgbh Ltd | Professional & scientific | 2017 |
| BGP Removals Limited | Transport & logistics | 2011 |
| BGP Residential Property Limited | Real estate | 2025 |
| BID Properties Limited | Real estate | 2020 |
| Big Blue Creative Limited | Professional & scientific | 2020 |
| Big Spuds Creative Marketing & Merchandise Ltd | Professional & scientific | 2026 |
| Bigchess Limited | Manufacturing | 2015 |
| Bignell Shacklady & Ewing Limited | Professional & scientific | 1993 |
| Bilcars Limited | Wholesale & retail | 2023 |
| Billy Platt Building Limited | Construction | 2018 |
| Billy's Speed Shop Ltd | Wholesale & retail | 2019 |
| Bilston Subs Limited | Hospitality | 2009 |
| Birches Valley Gymnastics Limited | Arts & recreation | 2014 |
| Bird & Co Barbershop Limited | Other services | 2018 |
| Birmingham Hong Kong Festival CIC | Administrative & support | 2026 |
| Biro Trans Ltd | Transport & logistics | 2021 |
| Bishbash Ltd | Construction | 2009 |
| Bishop Chauffeurs Ltd | Transport & logistics | 2010 |
| Bishop Environmental Limited | Wholesale & retail | 2022 |
| Black Country Saddles Limited | Manufacturing | 2002 |
| Black Country Training Limited | Education | 2014 |
| Black Dog 3D Studio Ltd | Wholesale & retail | 2024 |
| Black Flag Solutions Ltd | Financial services | 2022 |
| Blackmountainuk Ltd | Wholesale & retail | 2025 |
| Blackwell Advisory Ltd | Professional & scientific | 2026 |
| Blackwolf Bathrooms Limited | Construction | 2026 |
| Blade Brickwork Ltd | Construction | 2019 |
| Bland Consulting Ltd | Information & communication | 2026 |
| BLH Distribution Ltd | Wholesale & retail | 2024 |
| Blind Shot Ltd | Manufacturing | 2026 |
| BLINDS2TRADE Limited | Other services | 2020 |
| Bloom Support and Care Limited | Health & social care | 2026 |
| Bloomfield Composting Limited | Administrative & support | 2007 |
| Blossom Court Ltd | Hospitality | 2023 |
| BLOSSOM6 Limited | Information & communication | 2025 |
| Bloxwich Healthcare Limited | Health & social care | 2014 |
| Blue Air Ltd | Construction | 2019 |
| Blue Boar Group Limited | Professional & scientific | 1995 |
| Blue Emerald Group Ltd | Financial services | 2024 |
| Blue Emerald Property Investment Co Ltd | Real estate | 2021 |
| Blue Emerald Property Management Co Ltd | Real estate | 2023 |
| Blue FOX Coaching Limited | Education | 2019 |
| Blue FOX Property Limited | Administrative & support | 2012 |
| Blue Olive Solutions Ltd | Wholesale & retail | 2025 |
| Blue Sky Rent Solutions Ltd | Real estate | 2023 |
| Blue Star FM Limited | Manufacturing | 2017 |
| Blue Wave Plumbing and Heating Ltd | Construction | 2009 |
| Bluebell Hill Nursery Ltd | Health & social care | 2021 |
| Bluechipworld Sales and Marketing Limited | Wholesale & retail | 2022 |
| Blueflow Heating Limited | Manufacturing | 2024 |
| Bluestar SVS Limited | Transport & logistics | 2018 |
| BM Brickwork Ltd | Construction | 2025 |
| BMS Offshore (UK) Limited | Other services | 2026 |
| BN Developments Limited | Construction | 2020 |
| BNT Holdings Ltd | Administrative & support | 2021 |
| Boardwise Ltd | Wholesale & retail | 1996 |
| Boatfeet Media Ltd | Information & communication | 2026 |
| Body & Sole Beauty Limited | Other services | 2009 |
| Bodyart Advertising Ltd | Professional & scientific | 2006 |
| Bolt E-Bikes Limited | Wholesale & retail | 2023 |
| Bonehillwhite Limited | Wholesale & retail | 2014 |
| Bonita Mujer Bridal Training Academy Ltd | Other services | 2016 |
| Boot & SON Ltd | Real estate | 2019 |
| Bootscoota Limited | Manufacturing | 2016 |
| Booze 4 Less Ltd | Wholesale & retail | 2019 |
| Boudicca’S Woodshed Ltd | Manufacturing | 2025 |
| Boundary Concepts Limited | Construction | 2020 |
| Bourne Safety Ltd | Public administration | 2018 |
| BOW Tinners (Hertford) Limited | Professional & scientific | 2002 |
| Bowman Holdings Limited | Real estate | 2018 |
| Box Lighting Limited | Wholesale & retail | 2021 |
| Boxing Day 365 Limited | Extraterritorial | 2021 |
| Boxxed 42 Ltd | Professional & scientific | 2026 |
| Boyd's Hair & Beauty Ltd | Other services | 2024 |
| BP Recycling Solutions Limited | Other services | 2017 |
| Bradbury Transport Property Ltd | Real estate | 2016 |
| Bradley Framing Ltd | Wholesale & retail | 2024 |
| Braemar Forestry & Arboriculture Limited | Professional & scientific | 2015 |
| Bragg Consulting Ltd | Professional & scientific | 2026 |
| Brand Masters UK Holding Limited | Financial services | 2026 |
| Brendan Lees Developments Limited | Real estate | 1988 |
| Breslins Cannock Ltd | Professional & scientific | 2020 |
| Brewood Landscapes (Maintenance) Limited | Administrative & support | 2025 |
| Brexit Healthcare Invest UK Limited | Health & social care | 2018 |
| Bridgewater Gardens Management Services Limited | Other services | 2012 |
| Bridgr Loans Limited | Financial services | 2021 |
| Bridgtown Cafe Ltd | Hospitality | 2025 |
| Bridgtown Chippy & Cafe Limited | Hospitality | 2022 |
| Bridgtown Chippy and Silly Sausage Cafe Ltd | Hospitality | 2014 |
| Briggs Equipment UK Limited | Administrative & support | 2006 |
| Brigham Consultants Limited | Information & communication | 2021 |
| Bright Lights Logistics Limited | Transport & logistics | 2017 |
| Brightclean Contract Cleaning Limited | Administrative & support | 2023 |
| Brindley Clarke Properties Limited | Real estate | 2018 |
| Brindley Construction Ltd | Construction | 2021 |
| Brintec Limited | Construction | 1999 |
| Britannia Pine Ltd | Wholesale & retail | 2005 |