| Black Leaf Property Investments Ltd | Construction | 2024 |
| Black Oracle Ltd | Other services | 2023 |
| Black Parade Cards Limited | Wholesale & retail | 2026 |
| Black Point REC Payroll Ltd | Administrative & support | 2018 |
| Black Rock Projects (Coseley) Limited | Construction | 2020 |
| Black Thorn Apparel Ltd | Wholesale & retail | 2026 |
| Blackdeer Photography Ltd | Professional & scientific | 2022 |
| Blacker & Sons Developments Ltd | Real estate | 2019 |
| Blacker Relf Property Group Limited | Real estate | 2025 |
| Blackhawk Security Group Ltd | Administrative & support | 2026 |
| Blackledge Property Limited | Real estate | 2024 |
| Blackline Rentals Ltd | Administrative & support | 2025 |
| Blacklisted Collective Ltd | Manufacturing | 2025 |
| Blacklisted Ltd | Wholesale & retail | 2026 |
| Blackpages.Online Ltd | Wholesale & retail | 2024 |
| Blackrook Media Limited | Professional & scientific | 2012 |
| Blackrook Productions Limited | Arts & recreation | 2012 |
| Blacksail Limited | Professional & scientific | 2024 |
| Blacksheep Hair Limited | Other services | 2015 |
| Blackwood IT Limited | Information & communication | 2018 |
| Blagovest Ltd | Construction | 2026 |
| Blagovest Services Limited | Construction | 2026 |
| Blakenhall Action Community Forum | Administrative & support | 2002 |
| Blakenhall Newsagents Ltd | Wholesale & retail | 2015 |
| Blakenhall Stores Ltd | Wholesale & retail | 2021 |
| Blanko LUX International Ltd | Transport & logistics | 2024 |
| Blazesafe Fire Consultancy Ltd | Professional & scientific | 2026 |
| BLC Hub Limited | Wholesale & retail | 2017 |
| Bleepbox Electronics Limited | Wholesale & retail | 2009 |
| Blenza Ltd | Wholesale & retail | 2025 |
| Blessing B Limited | Health & social care | 2022 |
| Blessing Couriers Ltd | Transport & logistics | 2017 |
| Blessterame Ltd | Administrative & support | 2021 |
| Blinc Optical Consultancy Limited | Health & social care | 2013 |
| Blinds Choice Ltd | Wholesale & retail | 2024 |
| Blinglabco. Ltd | Wholesale & retail | 2025 |
| Bliss Beauty International LLP | | 2017 |
| Blissylocks Ltd | Other services | 2024 |
| Blithfield Property Solutions Ltd | Construction | 2025 |
| Bloc Properties WM Ltd | Real estate | 2024 |
| Blocks and More Ltd | Manufacturing | 2022 |
| Blockwork Developments Ltd | Real estate | 2020 |
| Blonde Kitchen Ltd | Hospitality | 2025 |
| Blooginga Tech Solution Ltd | Information & communication | 2024 |
| Blooming Buds Limited | Education | 2013 |
| Bloomsbury & Belle Floral Creations Limited | Wholesale & retail | 2026 |
| Bloorie Developments Limited | Construction | 2018 |
| Bloorie Group Limited | Financial services | 2017 |
| Bloq Homes Ltd | Wholesale & retail | 2023 |
| Blossom Bridge Healthcare Solutions Ltd | Administrative & support | 2019 |
| Blossom George Homes Limited | Real estate | 2019 |
| Blossom Horizon Healthcare Limited | Health & social care | 2025 |
| Blossom Sanctuary Ltd | Real estate | 2026 |
| Blossom Send Consultancy Ltd | Education | 2023 |
| Blossom Side Healthcare Limited | Health & social care | 2014 |
| Blossoming Learning Hub Ltd | Education | 2025 |
| Bloxwich Aluminium Casting Co.Limited | Manufacturing | 1969 |
| Bloxwich Hand Car Wash Ltd | Administrative & support | 2024 |
| BLP Installations Ltd | Construction | 2019 |
| BLS Access Limited | Wholesale & retail | 2021 |
| BLT Environmental Support Services Limited | Administrative & support | 2007 |
| BLU Global UK Limited | Administrative & support | 2014 |
| BLU Management Limited | Professional & scientific | 2026 |
| Blu-Sky Care Limited | Administrative & support | 2008 |
| Blue & Peak Commerce Ltd | Wholesale & retail | 2026 |
| Blue Band Properties Limited | Real estate | 2022 |
| Blue Bells Real Estates Limited | Real estate | 2023 |
| Blue Car Wash & Valeting Ltd | Administrative & support | 2026 |
| Blue Castle Home Improvements Limited | Construction | 2013 |
| Blue Flame Profiles Ltd | Manufacturing | 2009 |
| Blue GEM Healthcare Ltd | Information & communication | 2023 |
| Blue HAT Studio Ltd | Information & communication | 2024 |
| Blue Horse Haulage Limited | Transport & logistics | 2018 |
| Blue Horse Investments Ltd | Real estate | 2019 |
| Blue Line Connections Limited | Information & communication | 2021 |
| Blue Marble Estate Holdings Ltd | Real estate | 2023 |
| Blue Marble Estates Limited | Real estate | 2018 |
| Blue Moon PVT Ltd | Wholesale & retail | 2020 |
| Blue Mountain Foods Limited | Wholesale & retail | 1995 |
| Blue Pines Tax Advisors & Accountants Ltd | Professional & scientific | 2022 |
| Blue Rose T Ltd | Other services | 2025 |
| Blue Sapphire Fortune Ltd | Real estate | 2025 |
| Blue Shore Capital Limited | Real estate | 2025 |
| Blue Skies Training Limited | Transport & logistics | 2015 |
| Blue Sky PPC Ltd | Other services | 2021 |
| Blue Sky Technical Solutions Ltd | Administrative & support | 2021 |
| Blue Square Investments Ltd | Real estate | 2020 |
| Blue Valeting Centre Ltd | Administrative & support | 2026 |
| Blue Vault Properties Limited | Real estate | 2026 |
| Bluebay Voyages Limited | Administrative & support | 2025 |
| Bluebells Children Services Ltd | Health & social care | 2025 |
| Bluebird Builders Ltd | Construction | 2017 |
| Bluebonnet Horizon Limited | Real estate | 2026 |
| Bluebridge Consult Limited | Financial services | 2017 |
| Blueflame Property Ltd | Construction | 2024 |
| Bluegate Car Sales Ltd | Wholesale & retail | 2026 |
| Bluegate Trading Ltd | Wholesale & retail | 2026 |
| Bluegoldfish Ltd | Construction | 2024 |
| Bluehills Estate Ltd | Real estate | 2024 |
| Bluehills International Ltd | Water & waste | 2025 |