| Bluemarrow Ltd | Administrative & support | 2026 |
| Bluewave Management Ltd | Professional & scientific | 2025 |
| BM Building Solutions Ltd | Administrative & support | 2021 |
| BMC Trade Ltd | Wholesale & retail | 2025 |
| BML Consult Ltd | Administrative & support | 2015 |
| BMS Business Ltd | Real estate | 2019 |
| BNB Transportation Ltd | Transport & logistics | 2025 |
| BNE (Bolt & NUT Engineering) Limited | Manufacturing | 2009 |
| BNM (Bolt & NUT Manufacturing) Limited | Manufacturing | 2008 |
| Boders the Baker Ltd | Hospitality | 2025 |
| Bodied Ltd | Health & social care | 2022 |
| Bogdan Transport Services Ltd | Transport & logistics | 2017 |
| Bologna Food Ltd | Hospitality | 2025 |
| Bolux Pro Media UK Ltd | Information & communication | 2025 |
| Book Writting Ltd | Wholesale & retail | 2023 |
| Bordesley Green Garage (Bilston) Limited | Wholesale & retail | 1975 |
| Borland Virilitas Ltd | Information & communication | 2025 |
| Boscobell Ltd | Hospitality | 2017 |
| Bostin Baps Ltd | Hospitality | 2022 |
| Botshrue Health Care Ltd | Administrative & support | 2025 |
| Boujee Bathrooms Ltd | Construction | 2019 |
| Boujon Limited | Hospitality | 2025 |
| Bounceology Ltd | Arts & recreation | 2026 |
| Bowen Electrical Installations Ltd | Construction | 2018 |
| Bowjangles (Midlands) Ltd | Administrative & support | 2009 |
| Box Clever Transport Ltd | Transport & logistics | 2019 |
| Braich Property Group Limited | Real estate | 2025 |
| Braich UK Limited | Health & social care | 2002 |
| Bralo UK Limited | Wholesale & retail | 2000 |
| Breakthru CIC | Information & communication | 2023 |
| Brenelectrical Limited | Construction | 2023 |
| Brewood Plumbing Ltd | Construction | 2020 |
| Briar Grey Ltd | Administrative & support | 2025 |
| Bricesco Limited | Manufacturing | 2006 |
| Bridge Automotive Academy Limited | Education | 2012 |
| Bridgepoint Investments UK Limited | Real estate | 2013 |
| Bright Star Health Solutions Limited | Extraterritorial | 2018 |
| Brighter Days Daycare Ltd | Health & social care | 2023 |
| Brill Burgerz Ltd | Hospitality | 2022 |
| Brit Pack (UK) Limited | Wholesale & retail | 2021 |
| Brital RKG Ltd | Construction | 2014 |
| Britannia Hygiene Limited | Wholesale & retail | 2015 |
| Britasian Foods & Beverages Ltd | Wholesale & retail | 2025 |
| Britasian Ltd | Wholesale & retail | 2025 |
| Brittons Fork Lifts Ltd | Manufacturing | 2003 |
| BRJ Builders Ltd | Construction | 2025 |
| Broad & Sons Ltd | Construction | 2023 |
| Broadeng Solutions Limited | Wholesale & retail | 2019 |
| Brooke Welding Limited | Construction | 2017 |
| Brooks Maintenance Services Ltd | Construction | 2025 |
| Brunswick Arms Limited | Hospitality | 2025 |
| Bryn Capital Limited | Financial services | 2024 |
| Brynel Estate Planning Ltd | Other services | 2018 |
| BSA Three Ltd | Wholesale & retail | 2025 |
| BSB Transport Services Ltd | Transport & logistics | 2023 |
| BSF Design Ltd | Manufacturing | 2023 |
| BSI Healthcare Training Limited | Professional & scientific | 2023 |
| BSJ Business Limited | Financial services | 2019 |
| BSJ Fixings and Construction Ltd | Wholesale & retail | 2017 |
| BT Group Properties Ltd | Real estate | 2025 |
| BTX Trans Ltd | Transport & logistics | 2019 |
| Budget Tree & Landscapes Ltd | Administrative & support | 2019 |
| Buildbuddy UK Construction Ltd | Construction | 2026 |
| BUJ Marketing Limited | Professional & scientific | 2025 |
| BUN BIT Ltd | Hospitality | 2025 |
| Burnside Healthcare Ltd | Health & social care | 2025 |
| Business Electric Solution Ltd | Energy | 2025 |
| Business Supplies Limited | Wholesale & retail | 2005 |
| Buttar Investment Ltd | Real estate | 2025 |
| BWS Enterprise CIC | Education | 2022 |
| Byrne Utilities Ltd | Construction | 2023 |
| C & K Transport Yard Ltd | Transport & logistics | 2020 |
| C & S Electrical Installations Ltd. | Construction | 2007 |
| C Adams and Sons (Holdings) Ltd | Financial services | 2019 |
| C D T Property Solutions Ltd | Financial services | 2012 |
| C G Chibudu Limited | Health & social care | 2022 |
| C Light Windows Ltd | Construction | 2019 |
| C Reid TM Ltd | Construction | 2024 |
| C W Bricklaying Limited | Construction | 2013 |
| C&G Midlands Limited | Real estate | 2017 |
| C&J Welding Ltd | Manufacturing | 2022 |
| C&S Midlands Properties Limited | Real estate | 2018 |
| C-Light Ltd | Construction | 2017 |
| C. Adams & Sons (Midlands) Limited | Wholesale & retail | 1945 |
| C. Adams & Sons Limited | Wholesale & retail | 2008 |
| C. Locke Carpentry & Joinery Ltd | Construction | 2021 |
| C.A.L. Midlands Ltd | Transport & logistics | 2015 |
| C.D. Taylor Limited | Construction | 2015 |
| C.J. Connexions Ltd | Construction | 2015 |
| C.J. Spicer Construction Ltd | Construction | 2024 |
| C.J.H.W. Ltd | Construction | 2019 |
| C.J.M. [WM] Ltd | Construction | 2022 |
| C.J.S Window Services Limited | Construction | 2007 |
| C.L.A Fabrications Ltd | Manufacturing | 2013 |
| C.L.A. Business Services Ltd | Wholesale & retail | 2024 |
| C.T.E Waste Limited | Water & waste | 2010 |
| C.T.E. Assets Ltd | Real estate | 2019 |
| C.T.E. Installations Ltd | Construction | 2018 |
| C4ALL Transport Ltd | Transport & logistics | 2023 |
| CA Legacy Ltd | Wholesale & retail | 2023 |