| Boar Logistics Ltd | Transport & logistics | 2025 |
| Boarbeck Limited | Information & communication | 2013 |
| BOB Jones Landscaping Ltd | Administrative & support | 2000 |
| BOB Wade Media Limited | Professional & scientific | 2010 |
| Bodega Boys UK Ltd | Wholesale & retail | 2020 |
| Bogdan&Daniela Ltd | Transport & logistics | 2022 |
| Bolar Limited | Wholesale & retail | 2020 |
| Bold-It Ltd | Information & communication | 2011 |
| Boldbeer Tasting Rooms Ltd | Hospitality | 2026 |
| Boldmere Butchers Ltd | Wholesale & retail | 2007 |
| Boldmere Clutch Centre Ltd | Wholesale & retail | 2018 |
| Boldmere Convenience Stores Ltd | Wholesale & retail | 2013 |
| Boldmere Dental Practice Limited | Health & social care | 2013 |
| Boldmere Electrical Services Limited | Construction | 2015 |
| Boldmere Excavators Limited | Administrative & support | 2009 |
| Boldmere Futures Community Interest Company | Other services | 2021 |
| Boldmere Glazing Company Limited | Construction | 2015 |
| Boldmere Golf Club Limited | Arts & recreation | 2014 |
| Boldmere Hardware Limited | Wholesale & retail | 2018 |
| Boldmere Pets & Gardens Limited | Wholesale & retail | 2021 |
| Boldmere Property Company Limited | Construction | 2024 |
| Boldmere Property Investments Ltd | Real estate | 2026 |
| Boldmere Service & MOT Centre Ltd | Wholesale & retail | 2013 |
| Boldmere Service Centre Ltd | Wholesale & retail | 2011 |
| Boldmere ST. Michael's Football and Athletic Club Limited | Arts & recreation | 1949 |
| Boldmere ST. Michael's Limited | Wholesale & retail | 2025 |
| Boldmere Stadia Limited | Arts & recreation | 2016 |
| Boldmere Tuition Ltd | Education | 2020 |
| Bolt Coffee Ltd | Hospitality | 2025 |
| Bolton Price LLP | | 2023 |
| Bonds Aesthetics Ltd | Other services | 2020 |
| Bondstore Limited | Transport & logistics | 2015 |
| Bonita Wellness & Aesthetics Limited | Other services | 2025 |
| Bonserv Ltd | Transport & logistics | 2026 |
| Boomma Property Holdings Ltd | Real estate | 2018 |
| Boost Foodservice Ltd | Hospitality | 2024 |
| Borg Photographz Ltd | Transport & logistics | 2016 |
| Born to Rewild Ltd | Professional & scientific | 2022 |
| Born to Travel Holidays Limited | Administrative & support | 2010 |
| Borno Ltd | Real estate | 1998 |
| Borough Developments JB Ltd | Construction | 2018 |
| Borough Estates Ltd | Real estate | 2015 |
| Borteshies Properties Limited | Hospitality | 2010 |
| Boss Flooring Solutions Limited | Construction | 2022 |
| Bostin Consulting Limited | Information & communication | 2022 |
| Botak Healthcare Limited | Health & social care | 2024 |
| Boulevard Barber Ltd | Other services | 2020 |
| Boundary Road Associates Management Fund Ltd | Households | 2005 |
| Bowbros Limited | Manufacturing | 1993 |
| Bowen Equity Ltd | Real estate | 2021 |
| Bowens Roofing & Cladding Ltd | Construction | 2015 |
| Bowfield Property Ltd | Real estate | 2024 |
| Bowmeows Limited | Wholesale & retail | 2010 |
| Boxair UK Limited | Extraterritorial | 2007 |
| Boxwell Investments Limited | Real estate | 2025 |
| Boys Yorkshire Limited | Hospitality | 2017 |
| BR Graphics Ltd | Information & communication | 2020 |
| Bracebridge Financial Limited | Professional & scientific | 2025 |
| Bracebridge Longmore Limited | Households | 2017 |
| Bracebridge Properties Limited | Construction | 2021 |
| Bracebridge Property Management Limited | Real estate | 2009 |
| Bracewood Ltd | Real estate | 2017 |
| Bracher Brothers Limited | Extraterritorial | 1960 |
| Bracher Holdings Limited | Financial services | 2023 |
| Bracher Property Ltd | Real estate | 2025 |
| Brackstone Denuevo Limited | Hospitality | 2021 |
| Bradstone Homes Limited | Real estate | 2016 |
| Brady Bags Ltd | Manufacturing | 2018 |
| Brady Residential Estates Ltd | Real estate | 2020 |
| Braemore Properties Limited | Real estate | 1998 |
| Brainstorm Corporation Limited | Professional & scientific | 2020 |
| Brambles Haulage Limited | Transport & logistics | 2011 |
| Brand IS Everything (Bise) Ltd | Professional & scientific | 2021 |
| Branded Clothing and Signage UK Limited | Wholesale & retail | 2023 |
| Branston Homes Limited | Construction | 2018 |
| Braw Hair Limited | Other services | 2004 |
| Braxel Properties Limited | Extraterritorial | 1972 |
| Brayford Numbers Limited | Information & communication | 2014 |
| Braziluk Ltd | Transport & logistics | 2018 |
| BRC Sourcing Ltd | Real estate | 2025 |
| Bread of Life Cafe INT. CIC | Hospitality | 2023 |
| Breakwell Design Partnership Limited | Professional & scientific | 2018 |
| Breckland Orchard Ltd | Hospitality | 2008 |
| Brempton Group Limited | Financial services | 1972 |
| Brentek Solutions Ltd | Professional & scientific | 2024 |
| Breslins Financial Planning Ltd | Financial services | 2025 |
| Breslins Sutton Coldfield Ltd | Professional & scientific | 2020 |
| Brew Digital Limited | Information & communication | 2018 |
| Brew Inc. Ltd | Financial services | 2024 |
| Brew Twenty Three Blythe Ltd | Hospitality | 2024 |
| Brew Twenty Three Group Limited | Financial services | 2024 |
| BRF Carpets & Flooring Limited | Wholesale & retail | 2002 |
| Briarden Limited | Real estate | 2014 |
| Briars Wood (Sutton Coldfield) Management Limited | Households | 1995 |
| Bridge House Capitol Ltd | Construction | 2020 |
| Bridge Lofts Property Management Ltd | Households | 2019 |
| Bridgers Central UK Limited | Real estate | 2014 |
| Bridgetown Trading Limited | Financial services | 2023 |
| Bridmin Limited | Water & waste | 1993 |
| Brierley Hill Bath Warehouse Company Limited | Construction | 2005 |