| Black Country Furniture Ltd | Manufacturing | 2025 |
| Black Country Holdings and Investments Ltd | Financial services | 2025 |
| Black Country Industrial Maintenance Ltd | Manufacturing | 2026 |
| Black Country Machines and Transport Ltd | Wholesale & retail | 2025 |
| Black Country Martial Arts Ltd | Arts & recreation | 2019 |
| Black Country Mental Health | Health & social care | 1990 |
| Black Country Plumbing & Heating Ltd | Construction | 2022 |
| Black Country Property Lettings Ltd | Real estate | 2026 |
| Black Country Retail Installations and Carriers Ltd | Construction | 2016 |
| Black Country Storage Limited | Transport & logistics | 2021 |
| Black Country Storage Repairs Ltd | Construction | 2025 |
| Black Country Tours Limited | Transport & logistics | 1983 |
| Black Country Travel Ltd | Transport & logistics | 2025 |
| Black Country Wellbeing Hub CIC | Arts & recreation | 2019 |
| Black Goat Investments Ltd | Financial services | 2025 |
| Blackacres (CA2) Limited | Construction | 2019 |
| Blackacres (Chapel ASH) Limited | Construction | 2014 |
| Blackacres (HR) Limited | Construction | 2018 |
| Blackacres (KCH) Limited | Construction | 2014 |
| Blackacres (SR) Limited | Construction | 2018 |
| Blackacres Developments Limited | Construction | 2013 |
| Blackacres Group Limited | Real estate | 2019 |
| Blackacres Limited | Professional & scientific | 2008 |
| Blackacres Management Limited | Administrative & support | 2013 |
| Blackacres Property Limited | Construction | 2000 |
| Blackhalve Lane Gardens Managment Company Limited | Real estate | 2024 |
| Blackjack Media Limited | Information & communication | 2016 |
| Blackprint Holdings Ltd | Financial services | 2024 |
| Blackstock Financial Services Ltd. | Financial services | 2011 |
| Blackstock Private Equity Ltd | Financial services | 2023 |
| Blade Barbering Ltd | Other services | 2022 |
| Blakedown Funeral Services Ltd | Extraterritorial | 2015 |
| Blakedown Services Limited | Water & waste | 2006 |
| Blakenall Heath Management Company Limited | Households | 2006 |
| Blessing Flavour Ltd | Manufacturing | 2021 |
| Bling Clean Ltd | Extraterritorial | 2024 |
| Blink Business Ltd | Wholesale & retail | 2024 |
| Blondies Cafe Ltd | Hospitality | 2025 |
| Bloomer Contracting Limited | Construction | 2009 |
| Blossom Group Holdings Limited | Financial services | 2017 |
| Blossom ROW Ltd | Real estate | 2025 |
| Blowfish Bespoke Limited | Manufacturing | 2023 |
| Blowfish Glass Ltd | Manufacturing | 2020 |
| Blue Blaze Ltd | Hospitality | 2025 |
| Blue Dome Supported Housing Ltd | Real estate | 2019 |
| Blue Fuse Ltd | Wholesale & retail | 2025 |
| Blue Ocean Fish Bar Midlands Ltd | Wholesale & retail | 2022 |
| Blue Sapphire Consultancy Ltd | Administrative & support | 2019 |
| Bluebell Wood Florist Ltd | Wholesale & retail | 2023 |
| BM Coaching Ltd | Arts & recreation | 2018 |
| BM Consultants Limited | Professional & scientific | 2020 |
| BM Decking Ltd | Construction | 2019 |
| BM West Midlands Ltd | Wholesale & retail | 2025 |
| Bmca (1983) Limited | Arts & recreation | 2004 |
| BMF Singh Limited | Construction | 2025 |
| BMG Homes Lettings Ltd | Real estate | 2025 |
| BMG Homes Limited | Construction | 2019 |
| BMG Invest Limited | Real estate | 2024 |
| BMG Media Limited | Administrative & support | 2019 |
| BOB Richardson Holdings Limited | Financial services | 2019 |
| BOB Richardson Properties Limited | Real estate | 2019 |
| BOB Walker Builders Limited | Construction | 2025 |
| Boby Auto LLP | | 2023 |
| Body Art Studios (Bilston) Limited | Real estate | 2013 |
| Body Art Studios Limited | Real estate | 2003 |
| BOG Standard Holding Ltd | Financial services | 2024 |
| BOG Standard Plumbing and Heating Ltd | Construction | 2024 |
| Bojangles Nursery (West Midlands) Limited | Education | 2006 |
| Bold 22 Ltd | Professional & scientific | 2011 |
| Bold 44 Ltd | Professional & scientific | 2011 |
| Bolt & NUT Services Ltd | Wholesale & retail | 2005 |
| Bond Holdings & Investments Ltd | Financial services | 2024 |
| Bonner Contracts Limited | Extraterritorial | 2004 |
| Bordo Ltd | Wholesale & retail | 2014 |
| Bornitah Limited | Health & social care | 2024 |
| Borta Steel Limited | Construction | 2023 |
| BOS Internationals Capitals Limited | Wholesale & retail | 2025 |
| Bospro Holdings Limited | Real estate | 2021 |
| Bospro Limited | Real estate | 2008 |
| Boss Design Limited | Manufacturing | 1983 |
| Botabot Limited | Information & communication | 2015 |
| Botd Film Company Ltd | Information & communication | 2023 |
| Bottoms UP Wines Limited | Extraterritorial | 2012 |
| Boujee 360 Ltd | Hospitality | 2024 |
| Boulton Leisure Limited | Hospitality | 2023 |
| BOW Ventures Limited | Professional & scientific | 2026 |
| Bowen GEE Holdings Ltd | Financial services | 2024 |
| Bowies Trades Ltd | Administrative & support | 2025 |
| Bowland Tractors Limited | Administrative & support | 2002 |
| Bownes Holding Company Limited | Financial services | 2013 |
| Boxclever Holdings Ltd | Financial services | 2025 |
| Boxclever Mentoring in the Community C.I.C. | Education | 2024 |
| Boxclever Mentoring Ltd | Education | 2025 |
| Boxleys Limited | Administrative & support | 2007 |
| Boxout Group Ltd | Arts & recreation | 2021 |
| Boycott Barns Management Company Limited | Households | 2026 |
| BPM Midlands Ltd | Real estate | 2005 |
| BR Engineering and Industrial Services Ltd | Professional & scientific | 2025 |
| BR Number Holdings Ltd | Public administration | 2017 |
| Brades Rise (Oldbury) Management Company Limited | Households | 2004 |