| Big Bear Corporation Ltd | Wholesale & retail | 2023 |
| Big BOY Food Shack Limited | Hospitality | 2025 |
| Big Build Contractors Ltd | Construction | 2022 |
| Big Daddy Sports Ltd | Wholesale & retail | 2025 |
| Big Ideas Box Limited | Education | 2023 |
| Big Reds Gym & Fitness Limited | Arts & recreation | 2026 |
| Big Slice Ltd | Hospitality | 2020 |
| Bigbys Construction Ltd | Construction | 2023 |
| Bighustlers Ltd | Wholesale & retail | 2026 |
| Bigmama Healthcare Limited | Health & social care | 2023 |
| BIH Coventry Limited | Hospitality | 2023 |
| Bikaner Sweets & Catering Ltd | Wholesale & retail | 2023 |
| Bilkhu and Co Ltd | Professional & scientific | 2003 |
| Billennia Limited | Wholesale & retail | 2006 |
| Bims Healthcare Limited | Health & social care | 2023 |
| Binbon Limited | Information & communication | 2022 |
| Binder Sweet Centre Ltd | Hospitality | 2022 |
| Bingen Logistics Limited | Transport & logistics | 2014 |
| BIO Renewables Limited | Administrative & support | 2015 |
| Biosure Diagnostics Limited | Wholesale & retail | 2025 |
| Birch Street Partnership Limited | Real estate | 2022 |
| Birch Tree Gardens Limited | Households | 1999 |
| Birchees Ltd | Wholesale & retail | 2021 |
| Birchfield Residential Care Home Limited | Health & social care | 2025 |
| Birchills Automotive (Presswork) Limited | Manufacturing | 1964 |
| Birchills House Hand Car Wash Ltd | Administrative & support | 2023 |
| Birchills Joinery Products Limited | Manufacturing | 2002 |
| Birchills Sculptures & Metal Restorations Limited | Manufacturing | 2021 |
| Birchwood Dental Practice Limited | Health & social care | 2008 |
| Birkett Electric Limited | Manufacturing | 1978 |
| Birmingham Billiards Limited | Manufacturing | 1982 |
| Birmingham Burner (Walsall) Limited | Manufacturing | 1978 |
| Birmingham Cedars Limited | Information & communication | 2006 |
| Birmingham Crew Dj's & Events Ltd | Other services | 2020 |
| Birmingham International Training Academy Limited | Education | 2025 |
| Birmingham Law Centre | Professional & scientific | 2001 |
| Birmingham Open Source Solutions Ltd | Information & communication | 2010 |
| Birmingham Panthers Ltd | Education | 2024 |
| Birmingham Refrigeration Limited | Wholesale & retail | 2024 |
| Birmingham Services Ltd | Administrative & support | 2016 |
| Birmingham Technology Ltd | Professional & scientific | 2022 |
| Birnhorn Management Ltd | Health & social care | 2018 |
| Birring Properties 25 Limited | Real estate | 2025 |
| Birstgate Limited | Hospitality | 2022 |
| Bishba Lifestyle Ltd | Public administration | 2024 |
| Bishba Ltd | Health & social care | 2021 |
| Bishop UK Holdings Ltd | Financial services | 2023 |
| Bismillah Halal Meat (Walsall) Ltd | Wholesale & retail | 2018 |
| Bitaandbobsforsale Ltd | Wholesale & retail | 2025 |
| Bittubecatering Ltd | Hospitality | 2025 |
| Bixel Limited | Other services | 2025 |
| Bizo Chippy Ltd | Hospitality | 2026 |
| Bizz Directions INT Ltd | Professional & scientific | 2023 |
| BJ Landscaping Ltd | Administrative & support | 2000 |
| BJ Leathers Ltd | Manufacturing | 2012 |
| BJB Transport Limited | Transport & logistics | 2016 |
| BJD Building & Landscaping Limited | Construction | 2012 |
| BJD Metal Recycling Ltd | Water & waste | 2024 |
| BJD Skip Hire Ltd | Water & waste | 2024 |
| BJF Property Management Ltd | Real estate | 2015 |
| BK Logic Transport Limited | Transport & logistics | 2016 |
| BK Midland Property Services Ltd | Real estate | 2026 |
| BK Plus (Birmingham) Limited | Professional & scientific | 1998 |
| BK Plus (Cheltenham) Limited | Extraterritorial | 1997 |
| BK Plus (Chorley) Limited | Professional & scientific | 2007 |
| BK Plus (Huddersfield) Limited | Professional & scientific | 2005 |
| BK Plus (Solihull) Limited | Extraterritorial | 2000 |
| BK Plus (ST Helens) Limited | Extraterritorial | 2019 |
| BK Plus (Stoke) Limited | Extraterritorial | 2015 |
| BK Plus (Wokingham) Limited | Professional & scientific | 2004 |
| BK Plus Audit Limited | Professional & scientific | 2021 |
| BK Plus High Wycombe Limited | Extraterritorial | 2010 |
| BK Plus Limited | Professional & scientific | 2015 |
| BK Plus Probate Limited | Professional & scientific | 2013 |
| Bkal UK Holdings Limited | Financial services | 2025 |
| BKB Media Limited | Professional & scientific | 2015 |
| BL Optical Holdings Ltd | Financial services | 2026 |
| Black Bear Kiss Ltd | Information & communication | 2022 |
| Black Birches (Hadnall) Ltd | Construction | 2007 |
| Black Box Promotions Limited | Arts & recreation | 2015 |
| Black Cat Property Midlands Ltd | Real estate | 2016 |
| Black Circle Tattoo Studio Ltd | Arts & recreation | 2023 |
| Black Country Bedzz Limited | Wholesale & retail | 2017 |
| Black Country Car Hub Limited | Wholesale & retail | 2026 |
| Black Country Commercial & Tyres Ltd | Wholesale & retail | 2024 |
| Black Country Financial Services Limited | Professional & scientific | 2024 |
| Black Country Glass Ltd | Manufacturing | 2017 |
| Black Country Health Solutions Limited | Health & social care | 2011 |
| Black Country Holdings Limited | Households | 2017 |
| Black Country Innovate C.I.C. | Education | 2018 |
| Black Country Management Limited | Health & social care | 2016 |
| Black Country Snacks Ltd | Wholesale & retail | 2005 |
| Black Country Vehicle Disposal Limited | Water & waste | 2026 |
| Black Country Windows Limited | Manufacturing | 1991 |
| Black Dog Upholstery Limited | Manufacturing | 2016 |
| Black Horse Logistics Limited | Transport & logistics | 2017 |
| Black Moor Canal Ltd | Real estate | 2025 |
| Black Raven Armoury Ltd | Wholesale & retail | 2016 |
| Black Sapphire Properties Limited | Real estate | 2023 |
| Black Sea Gardens Ltd | Construction | 2024 |