| Birmingham Flight Centre Travel Limited | Administrative & support | 1988 |
| Birmingham Heating and Renewables Ltd | Construction | 2025 |
| Birmingham HPB Clinic LLP | | 2025 |
| Birmingham Judo and Jiujitsu Ltd | Arts & recreation | 2020 |
| Birmingham Maths Team Ltd | Education | 2011 |
| Birmingham Orthodontics Ltd | Health & social care | 2024 |
| Birmingham Pilates Studio’S Limited | Other services | 2023 |
| Birmingham Property Developments Ltd | Real estate | 2023 |
| Birmingham Raiders FC Ltd | Arts & recreation | 2022 |
| Birmingham Reclaimed Limited | Wholesale & retail | 2023 |
| Birmingham Reclaimed Materials Limited | Wholesale & retail | 2025 |
| Birmingham Runners Shop Limited(The) | Wholesale & retail | 1982 |
| Birmingham Surgery Limited | Health & social care | 2022 |
| Birmingham to Let.Com Limited | Real estate | 2024 |
| Biro Medics Ltd | Health & social care | 2013 |
| Bishop Holdings Limited | Financial services | 2025 |
| Bishop Vesey's Grammar School | Education | 2012 |
| Bishop Wilson Property Investments Ltd | Real estate | 2025 |
| Bishops Surgical Ltd | Health & social care | 2021 |
| Bismillah Express Ltd | Health & social care | 2025 |
| Bissell & Brown Sutton Limited | Professional & scientific | 1974 |
| Bisti Limited | Hospitality | 2025 |
| Bitlet Ltd | Real estate | 2025 |
| BJ Crosbie Builders Ltd | Construction | 2023 |
| BJB Renewables Ltd | Energy | 2013 |
| BJF Coaching.Me.Uk Limited | Arts & recreation | 2012 |
| BKD Pharm Limited | Health & social care | 2024 |
| BKH Consultants Ltd | Information & communication | 2026 |
| Bkss Consulting Limited | Information & communication | 2023 |
| BKY Care Limited | Health & social care | 2020 |
| BKY Holdings Limited | Financial services | 2020 |
| BKY Properties Limited | Real estate | 2020 |
| Bl&Coproperties Ltd | Real estate | 2025 |
| Black Bear Consulting Services Ltd | Professional & scientific | 2026 |
| Black Book & Co. Ltd | Financial services | 2024 |
| Black Country Crane & Plant Hire Ltd | Wholesale & retail | 2024 |
| Black Country Residential Properties Ltd | Real estate | 2025 |
| Black Forge Capital Ltd | Real estate | 2025 |
| Black Health Exchange CIC | Health & social care | 2026 |
| Black Mirror Security Ltd | Information & communication | 2019 |
| Black Raven Consulting Limited | Information & communication | 2025 |
| Black Terrazzo Limited | Construction | 2003 |
| Blackbird Nest Limited | Real estate | 2025 |
| Blackbrook Meadow Services Ltd | Real estate | 2020 |
| Blackgreaves Management Limited | Households | 1999 |
| Blackheath Golf Club Limited | Arts & recreation | 2025 |
| Blackroot Bistro Limited | Hospitality | 2005 |
| Blackroot Estates Ltd | Real estate | 2024 |
| Blackwater Property Developments Limited | Real estate | 2019 |
| Blackwood Butchers of Streetly Ltd | Wholesale & retail | 2017 |
| Blackwood Electrical Solutions Limited | Construction | 2022 |
| Blackwood Estate Planning Limited | Professional & scientific | 2023 |
| Blackwood Local Limited | Wholesale & retail | 2023 |
| Blake Electrical Services Limited | Construction | 2016 |
| Blakeacre Limited | Manufacturing | 1986 |
| Blakeland Properties Limited | Households | 2025 |
| Blend Interiors Limited | Wholesale & retail | 2023 |
| Blessed Uriel Group of Company Ltd | Administrative & support | 2026 |
| Blinds for Trade Limited | Manufacturing | 2019 |
| Blink IT Projects Limited | Information & communication | 2019 |
| Bliss England Limited | Extraterritorial | 2013 |
| Bliss Haven Limited | Real estate | 2024 |
| Blissful Homes Limited | Real estate | 2021 |
| Bloomfield Financial Management Limited | Professional & scientific | 2017 |
| Blossom Collection Ltd | Administrative & support | 2013 |
| Blossom Street Management Limited | Real estate | 2019 |
| BLS UK Hotels Limited | Hospitality | 2024 |
| Bltb Limited | Financial services | 2026 |
| Blue & Williams Limited | Agriculture & fishing | 2025 |
| Blue OCT Ltd | Real estate | 2017 |
| Blue Rose Counselling Ltd | Other services | 2025 |
| Blue Shop B73 Ltd | Wholesale & retail | 2026 |
| Blue Sky House Limited | Real estate | 2020 |
| Blue Sky Property Estates Ltd | Real estate | 2021 |
| Blue Spirit Services Limited | Professional & scientific | 2025 |
| Blue Submarine Foods Ltd | Hospitality | 2026 |
| Blue Vale Properties Limited | Real estate | 2023 |
| Blue Wave Digital Ltd | Wholesale & retail | 2024 |
| Blueberry Motor Group Ltd | Wholesale & retail | 2024 |
| Bluebird Day Ltd | Wholesale & retail | 2025 |
| Bluedot Solutions and Services Ltd | Information & communication | 2014 |
| Bluefin Business Capital Limited | Financial services | 2026 |
| Bluehorse Automotive Limited | Wholesale & retail | 2012 |
| Bluejay Care Ltd | Health & social care | 2021 |
| Bluekey Properties Limited | Real estate | 2025 |
| Bluemont Property Limited | Real estate | 2026 |
| Bluewhale Limited | Hospitality | 2008 |
| Blunt Security Limited | Administrative & support | 2021 |
| Bluplan Construction Services Ltd | Professional & scientific | 2017 |
| Blushed Tanning Ltd | Other services | 2025 |
| Bluwave Cloud Limited | Information & communication | 2018 |
| BM Developments & Holdings Limited | Real estate | 2025 |
| BM Eco Distribution Limited | Wholesale & retail | 2023 |
| Bmars Locum Ltd | Health & social care | 2018 |
| BMC Commercial Enterprises Ltd. | Real estate | 2016 |
| BMC Property Group Ltd | Real estate | 2020 |
| BMJ Construction Ltd | Construction | 2023 |
| BMT Ninety Three Limited | Real estate | 1969 |
| BNO Heating Ltd | Construction | 2024 |
| BNY Europe Ltd | Real estate | 2026 |