| Biznet Solutions Ltd | Financial services | 2026 |
| Biznet Utilities Ltd | Financial services | 2025 |
| Bizoni Ltd | Transport & logistics | 2019 |
| Bizplug Ltd | Information & communication | 2024 |
| Bizserv Ltd | Information & communication | 2015 |
| Bizsmart Holdings Ltd | Information & communication | 2024 |
| Bizsource Ltd | Construction | 2026 |
| Biztec Solutions Ltd | Wholesale & retail | 2024 |
| Bizwa Trading Limited | Information & communication | 2024 |
| Bizz Creative Limited | Professional & scientific | 2018 |
| BJ Cheese Packaging Ltd | Wholesale & retail | 2002 |
| BJ Corporation Ltd | Health & social care | 2022 |
| BJ Drisht Construction Limited | Construction | 2023 |
| BJ Flower Garden Limited | Hospitality | 2019 |
| BJ Foods Limited | Manufacturing | 2025 |
| BJ Ghuman Holdings Limited | Financial services | 2022 |
| BJ Property Services (GB) Limited | Real estate | 2013 |
| BJ Shere Khan Star City Limited | Hospitality | 2010 |
| Bjarn Maintenance Services Ltd | Construction | 2021 |
| BJB Sales UK Ltd | Wholesale & retail | 2023 |
| BJG III Limited | Real estate | 2017 |
| BJH Contracts UK Ltd | Construction | 2019 |
| BJH Productions Ltd | Information & communication | 2026 |
| Bjhfood Limited | Hospitality | 2024 |
| BJM HR Limited | Professional & scientific | 2026 |
| BJM MOT Ltd | Administrative & support | 2016 |
| Bjpc Transport Ltd | Transport & logistics | 2025 |
| Bjrw Properties Limited | Real estate | 2017 |
| Bjst (UK) Ltd | Real estate | 2020 |
| BJV Malhi Group Limited | Construction | 2022 |
| BJW Brands Ltd | Wholesale & retail | 2025 |
| BK Auto Spares Ltd | Wholesale & retail | 2022 |
| BK Blackburn Ltd | Hospitality | 2025 |
| BK Cleaners Limited | Administrative & support | 2025 |
| BK Fire Limited | Construction | 2007 |
| BK Glazing Midlands Ltd | Construction | 2019 |
| BK Luxurystyles Ltd | Wholesale & retail | 2026 |
| BK Nation Ltd | Information & communication | 2025 |
| BK Optom UK Limited | Health & social care | 2019 |
| BK Pegasus GAS, Electrical and Plumbing Ltd | Energy | 2025 |
| BK Realty Group Ltd | Real estate | 2023 |
| BK Tech Birmingham Ltd | Wholesale & retail | 2021 |
| BK Trade Ltd | Wholesale & retail | 2022 |
| BK2 Logistics Ltd | Transport & logistics | 2024 |
| BK2BK Deliveries Ltd | Transport & logistics | 2023 |
| BK4 (Leicester) Property Ltd | Construction | 2026 |
| BKA Living Ltd | Real estate | 2025 |
| BKB Builders Ltd | Construction | 2021 |
| BKB Property & Investments Ltd | Real estate | 2024 |
| BKB Property Solutions Limited | Households | 2023 |
| Bkblue Butterfly Ltd | Administrative & support | 2025 |
| BKD Associate Ltd | Health & social care | 2026 |
| BKH Services Ltd | Other services | 2021 |
| Bkic Limited | Professional & scientific | 2012 |
| BKJ (UK) Limited | Wholesale & retail | 2010 |
| BKK Constructions Ltd | Construction | 2025 |
| BKM Logistic Limited | Administrative & support | 2017 |
| BKS Clinic LLP | | 2004 |
| BKS Pharm Ltd | Professional & scientific | 2026 |
| BKS Properties (Midlands) Limited | Real estate | 2015 |
| BKS Telford Ltd | Real estate | 2023 |
| Bksg Construction Ltd | Construction | 2024 |
| BKW Corporate Ltd | Manufacturing | 2026 |
| BKZ Foods Limited | Hospitality | 2024 |
| BKZ Ltd | Hospitality | 2023 |
| BL Bluebutton 2014 Limited | Construction | 2014 |
| BL International Ltd | Financial services | 2026 |
| BL Kitchen Limited | Hospitality | 2025 |
| BL Midlands Limited | Hospitality | 2021 |
| Blaby Nails 2 Limited | Other services | 2020 |
| Blaby Property (Leicester) Limited | Real estate | 2023 |
| Blac Kanvas Ltd | Wholesale & retail | 2023 |
| Blacc + Blond Ltd | Other services | 2019 |
| Black & Luff Properties Limited | Professional & scientific | 1954 |
| Black & White Building Developers Limited | Construction | 2011 |
| Black Access Solutions Ltd | Construction | 2019 |
| Black and Gold Distillery Ltd | Wholesale & retail | 2020 |
| Black and White Leasing Ltd | Administrative & support | 2019 |
| Black and White Property Maintenance Ltd | Administrative & support | 2016 |
| Black BIN Bags Co Ltd | Manufacturing | 2025 |
| Black Bowl Ltd | Administrative & support | 2018 |
| Black Box Automotive Limited | Wholesale & retail | 1991 |
| Black British Book Fest CIC | Education | 2022 |
| Black British Book Festival Ltd | Education | 2022 |
| Black Bull Hotel Moffat Limited | Hospitality | 2016 |
| Black Business Magazine Ltd | Information & communication | 2023 |
| Black Card Marketing Limited | Professional & scientific | 2008 |
| Black Cat Investments Ltd | | 2007 |
| Black Cat IT Services and Solutions Limited | Information & communication | 2007 |
| Black Cat Studio Limited | Manufacturing | 2023 |
| Black Chili Limited | Information & communication | 2007 |
| Black Country (Bilston) Holdings Ltd | Hospitality | 2024 |
| Black Country (Darlaston) Holdings Ltd | Hospitality | 2024 |
| Black Country (Walsall) Holdings Ltd | Hospitality | 2024 |
| Black Country (Willenhall) Holdings Ltd | Hospitality | 2024 |
| Black Country Boats Limited | Wholesale & retail | 2024 |
| Black Country Boxing Ltd | Administrative & support | 2017 |
| Black Country Capital Ltd | Wholesale & retail | 2020 |
| Black Country Championship Wrestling Limited | Arts & recreation | 2024 |
| Black Country Concrete Ltd | Other services | 2018 |