| Birmingham FAN Limited | Extraterritorial | 2017 |
| Birmingham GUN Quarter Development Company Ltd | Real estate | 2025 |
| Birmingham Hospitality Holdings Limited | Hospitality | 2023 |
| Birmingham Knee Clinic Limited | Health & social care | 2025 |
| Birmingham Music Awards Ltd | Professional & scientific | 2018 |
| Birmingham Office Furniture Limited | Wholesale & retail | 2003 |
| Birmingham Office Supplies & Furniture Limited | Wholesale & retail | 2005 |
| Birmingham Office Supplies Limited | Wholesale & retail | 2004 |
| Birmingham Pickle Limited | Arts & recreation | 2025 |
| Birmingham Podcast Hub Limited | Information & communication | 2023 |
| Birmingham Pride (UK) Ltd | Other services | 2008 |
| Birmingham Properties Group Limited | Professional & scientific | 1991 |
| Birmingham Prototypes Limited | Administrative & support | 2018 |
| Birmingham Specialist Pipefitting Ltd | Construction | 2013 |
| Birmingham Storage Ltd | Extraterritorial | 2024 |
| Birmingham Supply Solutions Limited | Administrative & support | 2024 |
| Birmingham Tradfest Ltd | Arts & recreation | 2013 |
| Birmingham Walking Football Club Ltd | Arts & recreation | 2022 |
| Birth Technology Limited | Extraterritorial | 2011 |
| Birthability Limited | Health & social care | 2015 |
| Birtley Group Limited | Manufacturing | 1958 |
| Bishop's Hill Residents Management Company Limited | Households | 2019 |
| Bishops Building and Installation Services Ltd | Construction | 2018 |
| Bishopsgate (Birmingham) Limited | Households | 2006 |
| Bism Investments Ltd | Real estate | 2024 |
| Bism. Ltd | Professional & scientific | 2019 |
| BIT Testing Limited | Financial services | 2013 |
| Bitesize HR Limited | Administrative & support | 2022 |
| Bits Services Limited | Real estate | 2021 |
| Bixp Limited | Other services | 2024 |
| Biyat Energy & Environment Ltd. | Manufacturing | 2017 |
| BIZ Buddy Accountants Ltd | Professional & scientific | 2026 |
| Biz-Trade PVT Ltd | Wholesale & retail | 2019 |
| Bizboxco Ltd | Construction | 2011 |
| Bizimprove Limited | Professional & scientific | 2013 |
| BJM Recovery Ltd | Professional & scientific | 2013 |
| BJM1960 Ltd | Construction | 2015 |
| BK Electrical Ltd | Construction | 2005 |
| BK Plus (Warwick) LLP | | 2008 |
| BKA Safety Ltd | Construction | 2018 |
| BKH Property Group Limited | Real estate | 2022 |
| BKS Learning and Advisory Ltd | Professional & scientific | 2017 |
| BKW Operating Partners Limited | Professional & scientific | 2024 |
| BL Cheswick Green Limited | Hospitality | 2023 |
| Bl&D Consultancy Limited | Professional & scientific | 2014 |
| BLA Management Limited | Administrative & support | 2025 |
| Blab Capital Ltd | Real estate | 2021 |
| Black and Golds Letting Agents Limited | Real estate | 2016 |
| Black and Golds Limited | Real estate | 2012 |
| Black Eagle Group Limited | Financial services | 2021 |
| Black Oldco Limited | Construction | 2022 |
| Black Orange Cafe Limited | Hospitality | 2022 |
| Black Rock Devco LLP | | 2016 |
| Black Rock Holdco 1 LLP | | 2016 |
| Black Rock Holdco 2 LLP | | 2016 |
| Black Stone Business Services Ltd | Information & communication | 2023 |
| Black Train Music C.I.C. | Arts & recreation | 2018 |
| Blackbird Capital Investments Limited | Financial services | 2021 |
| Blackhurst International Ltd | Professional & scientific | 2008 |
| Blackpool Serenity Ltd | Hospitality | 2025 |
| Blackrock Communications Limited | Information & communication | 2025 |
| Blackrock Property Group Limited | Real estate | 2025 |
| Blackrocktechnology Limited | Professional & scientific | 2023 |
| Blackstar Equities Limited | Professional & scientific | 2012 |
| Blackstar Golf Limited | Administrative & support | 2012 |
| Blackstar Sporting Events Limited | Arts & recreation | 2015 |
| Blackstone Properties Group Limited | Real estate | 2018 |
| Blackthorn Drainage Ltd | Construction | 2021 |
| Blackwatch Consultants Limited | Construction | 2020 |
| Blake Auto Ltd | Wholesale & retail | 2020 |
| Blakedown Automotive Limited | Wholesale & retail | 2020 |
| Blakedown Car Company Ltd | Wholesale & retail | 2015 |
| Blakedown Property Group Ltd | Real estate | 2018 |
| Blakemore Holdings Ltd | Financial services | 2024 |
| Blakemore Property Holdings Ltd | Real estate | 2024 |
| Blank Page Global Ltd | Professional & scientific | 2025 |
| Blank Space Recruitment Limited | Administrative & support | 2022 |
| Blasdales Limited | Professional & scientific | 1978 |
| Blast-Off Brands Ltd | Wholesale & retail | 2021 |
| Blaxland Consulting Limited | Professional & scientific | 2016 |
| Blendtek Solutions Limited | Manufacturing | 2020 |
| Blenheim Security Installers Ltd | Administrative & support | 2010 |
| Blind Makers (Midlands) Limited | Manufacturing | 2003 |
| Bliss Management Ltd | Professional & scientific | 2024 |
| Blnded Ltd | Hospitality | 2025 |
| Bloc Architecture Ltd | Professional & scientific | 2020 |
| Bloom Companies Ltd | Professional & scientific | 2023 |
| Bloom Solihull Ltd | Hospitality | 2021 |
| Bloomer Wealth Management Limited | Financial services | 2018 |
| Bloomfield Recycling Ltd | Water & waste | 2025 |
| Blossom and Belong CIC | Health & social care | 2024 |
| Blossomfield Business Solutions Ltd | Professional & scientific | 2021 |
| Blossomfield Consulting Limited | Administrative & support | 2013 |
| Blossomfield Gardens Freehold Limited | Real estate | 2007 |
| Blossomfield Gardens Management Limited | Households | 1999 |
| Blossomfield Group Ltd | Financial services | 2020 |
| Blossomfield Properties Limited | Real estate | 2026 |
| Blossoms Pre-School Limited | Education | 2013 |
| BLU Fitness SW Ltd | Arts & recreation | 2024 |
| Blucon Community Foundation C.I.C. | Extraterritorial | 2014 |