| Blue Moon Cleaning Ltd | Administrative & support | 2023 |
| Blue Shark Entertainment Ltd | Information & communication | 2014 |
| Blue Sky Radio Cars Ltd | Transport & logistics | 2012 |
| Blue's Caribbean HUT Limited | Hospitality | 2023 |
| Bluebottle Editorial Services Ltd | Information & communication | 2022 |
| Bluecat Computers Ltd | Construction | 2020 |
| Bluecat Services Ltd | Construction | 2020 |
| BM Medical Ltd | Health & social care | 2015 |
| BMC Transport Ltd | Transport & logistics | 2022 |
| BMS Constructions Midlands Ltd | Construction | 2018 |
| BOB Shop 11 Grocery Limited | Wholesale & retail | 2025 |
| Bob's Plating (Midlands) Ltd | Professional & scientific | 2023 |
| Bob's Plating Limited | Professional & scientific | 1998 |
| Bobbo's Today's Catch Ltd | Hospitality | 2025 |
| Bobby's MCC Limited | Wholesale & retail | 2025 |
| Bolan Tech Ltd | Professional & scientific | 2024 |
| Bollywood Nails Ltd | Other services | 2018 |
| Bonroy Limited | Administrative & support | 2016 |
| Boondock Traders & Co. Ltd | Wholesale & retail | 2023 |
| Booth Street Accident Repairs Limited | Wholesale & retail | 2007 |
| Bore Supernews Ltd | Wholesale & retail | 2016 |
| Bored.Of.Things Ltd | Professional & scientific | 2025 |
| Borewala Krishna Housing Ltd | Construction | 2025 |
| Bosun Ltd | Manufacturing | 2021 |
| Botb Computers Ltd | Construction | 2020 |
| Botb Digital Ltd | Construction | 2020 |
| Botb Solutions Ltd | Construction | 2020 |
| Bournville BED and Breakfast Limited | Hospitality | 2018 |
| Bovet Solutions Ltd | Construction | 2020 |
| Boydo Ltd | Construction | 2025 |
| BR Coaching Ltd | Education | 2024 |
| Bracebridge Developments Limited | Real estate | 2025 |
| Braids by Mxrni Ltd | Other services | 2025 |
| Brainbop Ltd | Wholesale & retail | 2024 |
| Brar Autobots Ltd | Transport & logistics | 2025 |
| Brasshouse Limited | Wholesale & retail | 2025 |
| Brave and Bright Ltd | Professional & scientific | 2020 |
| BRD 1 Limited | Real estate | 2025 |
| Breakdown Recovery Network Ltd | Wholesale & retail | 2022 |
| Brentford Solutions Ltd | Construction | 2020 |
| BREW21 Ltd | Hospitality | 2021 |
| Brickwater Limited | Professional & scientific | 2004 |
| Bridge in the GAP Limited | Professional & scientific | 2017 |
| Bridge Steel Sections Limited | Extraterritorial | 1981 |
| Bridge the GAP Education Consultancy Limited | Education | 2011 |
| Bridgestreet IT Ltd | Construction | 2020 |
| Bridgestreet Services Ltd | Construction | 2020 |
| Bridgeway House Children's Services Ltd | Health & social care | 2016 |
| Brierley Balti Ltd | Hospitality | 2025 |
| Brigatan Ltd | Extraterritorial | 2021 |
| Bright Source Energy Solutions Ltd | Construction | 2024 |
| Brilet Limited | Wholesale & retail | 2016 |
| Britannia Build & FIX Ltd | Construction | 2025 |
| Brittherm Solutions Ltd | Manufacturing | 2025 |
| Britwide Consulting Limited | Information & communication | 2026 |
| BRIXC0 Ltd | Construction | 2025 |
| Broadway Bespoke Kitchens Limited | Manufacturing | 2020 |
| Broadway GRP Ltd | Construction | 2020 |
| Bromford Trading Limited | Wholesale & retail | 2017 |
| Bromwich Supermarket Ltd | Wholesale & retail | 2022 |
| Brooks Beauty Ltd | Other services | 2023 |
| Brooksflow Ltd | Information & communication | 2025 |
| Brookside Medical Ltd | Health & social care | 2022 |
| Brother Builders WM Ltd | Construction | 2026 |
| Brother's A&H Ltd | Transport & logistics | 2024 |
| Brothers Private Ltd | Wholesale & retail | 2015 |
| Brothers Real Estate Ltd | Real estate | 2020 |
| Brownins Food Limited | Hospitality | 2025 |
| Browse&Basket Ltd | Wholesale & retail | 2024 |
| Brrgrr Walsall Ltd | Hospitality | 2022 |
| Bruegel Ltd | Wholesale & retail | 2023 |
| Brumfix Electronics Ltd | Wholesale & retail | 2025 |
| Brumride Ltd | Transport & logistics | 2024 |
| Brunabesi Events Ltd | Hospitality | 2022 |
| BS Builders Midlands Limited | Construction | 2020 |
| BS Windows & Doors Limited | Construction | 2026 |
| BSC Care Services Ltd | Health & social care | 2020 |
| BSH Plant Ltd | Administrative & support | 2020 |
| BSH Remediation Limited | Water & waste | 2013 |
| BSI Healthcare Limited | Health & social care | 2015 |
| BSJ Solutions Ltd | Construction | 2020 |
| BSK Property Maintenance Ltd | Construction | 2018 |
| BSN Solutions Ltd | Construction | 2020 |
| BSS Consulting Ltd | Professional & scientific | 2023 |
| BSS Security Shutters Ltd | Other services | 2025 |
| Btown Logistics Limited | Transport & logistics | 2025 |
| Buci Transport Ltd | Transport & logistics | 2022 |
| Build Career Ltd | Education | 2017 |
| Build Future Enterprises Ltd | Construction | 2025 |
| Build Innovatives Ltd | Other services | 2021 |
| Build Plus Trades Limited | Construction | 2025 |
| Build&Clean Services Limited | Construction | 2021 |
| Building Different Limited | Construction | 2024 |
| Buildsafe Compliance Ltd | Professional & scientific | 2026 |
| Bujar Sons Ltd | Wholesale & retail | 2022 |
| Bulhac Buildings Ltd | Other services | 2017 |
| Bull Store Ltd | Wholesale & retail | 2021 |
| Bunnybro Cleaning Company Ltd | Administrative & support | 2026 |
| Burn the Ditch Ltd | Arts & recreation | 2024 |
| Business Hungry Ltd | Wholesale & retail | 2025 |