| Birmingham Health Innovation Campus Limited | Extraterritorial | 2020 |
| Birmingham International Business Park Management Company Limited | Real estate | 2024 |
| Birmingham LEP Company Limited | Construction | 2009 |
| Birmingham Neuromodulation Centre Limited | Health & social care | 2023 |
| Birmingham Parklands LP | | 2024 |
| Birmingham Partworn Tyres Limited | Wholesale & retail | 2023 |
| Birmingham Runner Sports Limited | Wholesale & retail | 1996 |
| Birmingham Schools PSP Phase 1A Limited | Education | 2007 |
| Birmingham Schools PSP Phase 1B Limited | Education | 2011 |
| Birmingham Schools SPC Holdings Phase 1A Ltd | Education | 2009 |
| Birmingham Schools SPC Holdings Phase 1B Limited | Education | 2011 |
| Birmingham Schools SPC Phase 1A Limited | Education | 2009 |
| Birmingham Schools SPC Phase 1B Limited | Education | 2011 |
| Birmingham Science Limited | Real estate | 2018 |
| Birmingham South GP LLP | | 2023 |
| Birmingham South Holdco Limited | Real estate | 2023 |
| Birmingham South LP | | 2023 |
| Birmingham South Nominees 1 Limited | Real estate | 2023 |
| Birmingham South Nominees 2 Limited | Real estate | 2023 |
| Birmingham Staff Limited | Administrative & support | 2020 |
| Birmingham Steel Supplies Ltd | Wholesale & retail | 2024 |
| Birnie Solutions Limited | Other services | 2011 |
| Birria Brothers Ltd | Hospitality | 2021 |
| Birsen Consulting UK Ltd | Information & communication | 2018 |
| Birstall Myers Solicitors Limited | Professional & scientific | 2018 |
| Birtle View Nursery Limited | Education | 2008 |
| Birtles Mill Farm Management Limited | Other services | 2020 |
| Birtles Parkland Ltd | Financial services | 2025 |
| Birtwistle Investments Limited | Real estate | 2003 |
| Birwin Limited | Hospitality | 2021 |
| Biryani Box Manchester Ltd | Hospitality | 2025 |
| Biryanis Limited | Wholesale & retail | 2019 |
| Bisal Investment Limited | Real estate | 2024 |
| Bisat Al-Reeh for Wholesale Trading Ltd | Wholesale & retail | 2026 |
| Bisat Traders Ltd | Wholesale & retail | 2026 |
| Bisco Foods Limited | Wholesale & retail | 2017 |
| Bisco Ltd | Wholesale & retail | 2026 |
| Bisebel International Services Ltd | Wholesale & retail | 2026 |
| Bisem Limited | Real estate | 2014 |
| Bisfat Beautiful Hair Ltd | Other services | 2024 |
| Bishbashwash Launderette Limited | Administrative & support | 2026 |
| Bishi Ltd | Information & communication | 2026 |
| Bishop Auckland Estates Ltd | Extraterritorial | 2016 |
| Bishop Carpentry Ltd | Manufacturing | 2022 |
| Bishop's Gate (Hoole) Management Company Limited | Households | 2001 |
| Bishops Park Investments Ltd | Hospitality | 2021 |
| Bishops Property Ltd | Real estate | 2015 |
| Bishopsgate Construction Limited | Construction | 2018 |
| Bishopsgate Funding Ltd | Financial services | 1999 |
| BISHOPSROAD15 Limited | Real estate | 2026 |
| Bishopstrow College Limited | Education | 1997 |
| Bisi Key Limited | Health & social care | 2016 |
| Bisiko Ltd | Wholesale & retail | 2025 |
| Bisikot Abip Ltd | Administrative & support | 2016 |
| Biskits Diner Ltd | Hospitality | 2024 |
| Bismaa Ltd | Wholesale & retail | 2020 |
| Bismi Limited | Wholesale & retail | 2005 |
| Bismillah Biryani Ltd | Wholesale & retail | 2024 |
| Bismillah Chicken Cottage Ltd | Hospitality | 2025 |
| Bismillah Food Limited | Hospitality | 2018 |
| Bismillah Ir-Rehman Ir-Raheem Limited | Wholesale & retail | 2025 |
| Bisn Technologies Ltd | Extraterritorial | 2010 |
| Bison Biotech Limited | Professional & scientific | 2020 |
| Bison Productions Ltd | Arts & recreation | 2023 |
| Bison Steakhouse Ltd | Wholesale & retail | 2026 |
| Bisq Ltd | Hospitality | 2026 |
| Bistro 1116 Ltd | Hospitality | 2016 |
| Bistrot Ltd | Hospitality | 2025 |
| Biswas and RAO Limited | Health & social care | 2022 |
| BIT Breakfast Ltd | Information & communication | 2017 |
| BIT Club Co., Ltd | Information & communication | 2022 |
| BIT on the Side Manchester Ltd | Manufacturing | 2018 |
| BIT Pixel Information Technology Co., Ltd | Information & communication | 2024 |
| BIT Remit Ltd | Financial services | 2025 |
| Bitbybitdesignsgroup Ltd | Information & communication | 2024 |
| Bitcon Devices Limited | Wholesale & retail | 1982 |
| Bitcon Estates Ltd | Real estate | 2022 |
| Biteboxancoats Ltd | Manufacturing | 2025 |
| Bitebuzz Limited | Hospitality | 2025 |
| Bitewise Consulting Limited | Information & communication | 2025 |
| Bitfable Ltd | Wholesale & retail | 2026 |
| Bitforce Solutions Limited | Information & communication | 2024 |
| Bitlure Ltd | Wholesale & retail | 2025 |
| Bitlync Limited | Wholesale & retail | 2025 |
| Bitnest Consultancy Ltd | Information & communication | 2025 |
| Bitochun Estates Ltd | Real estate | 2025 |
| Bitochun Holdings Ltd | Administrative & support | 2023 |
| Bitrees Limited | Hospitality | 2023 |
| Bits and Bots Online Ltd | Administrative & support | 2017 |
| Bits Sent Anywhere Ltd | Wholesale & retail | 2021 |
| BITS4HAIR Limited | Wholesale & retail | 2006 |
| Bitsense Limited | Information & communication | 2019 |
| Bitstreme Limited | Information & communication | 2018 |
| Bitter & Sweet Properties Limited | Real estate | 2020 |
| Bitura Technologies Limited | Information & communication | 2025 |
| Bive Consultancy Ltd | Construction | 2024 |
| Bivora Ltd | Professional & scientific | 2025 |
| Biya Enterprise Ltd | Wholesale & retail | 2026 |
| Biyya Ltd | Wholesale & retail | 2020 |
| BIZ Assets Ltd | Construction | 2015 |