| Biocanin International Limited | Professional & scientific | 2026 |
| Biocare (Holdings) Limited | Extraterritorial | 2002 |
| Biocare International Limited | Extraterritorial | 1994 |
| Biocare Limited | Manufacturing | 1985 |
| Birchfield Court Investments(Redditch)Limited | Real estate | 1964 |
| Birchfield Court Residents Webheath Limited | Other services | 2003 |
| Birgan Holdings Limited | Financial services | 2022 |
| Birgan Limited | Real estate | 2013 |
| Birmingham Brickwork Ltd | Construction | 2022 |
| Birmingham City Installations Limited | Construction | 2022 |
| Birmingham INK Tattoo Limited | Other services | 2018 |
| Birmingham Metal Spinning Company Ltd | Professional & scientific | 2020 |
| Birth by YOU Limited | Health & social care | 2024 |
| BIT Consulting (Europe) Limited | Professional & scientific | 2002 |
| Bizvest Global Ltd | Information & communication | 2026 |
| Black Forest Chocolates Limited | Manufacturing | 2017 |
| Black Napkins Ltd | Information & communication | 2004 |
| Black Pear Developments Limited | Real estate | 2015 |
| Black Pepper Group Ltd | Hospitality | 2026 |
| Blackcat Publishing Productions Limited | Information & communication | 2026 |
| BLACKHORSE143 Ltd | Wholesale & retail | 2025 |
| Blackstar Mortgages Ltd | Financial services | 2023 |
| Blackwell Windows & Doors Ltd | Construction | 2018 |
| Blake & Hale Associates Ltd | Professional & scientific | 2018 |
| Blake Lodge Residents Association Limited | Households | 1985 |
| Blake&Darvill Building and Developments Ltd | Construction | 2025 |
| Blighty Manufacturing Limited | Extraterritorial | 2021 |
| Blinking Violets Limited | Other services | 2015 |
| Bliss Bars Limited | Hospitality | 2006 |
| Bliss Creative Limited | Other services | 2023 |
| BLJ Investments Ltd | Administrative & support | 2023 |
| Blooming Cotswolds Limited | Wholesale & retail | 2021 |
| Blservices Multi Ltd | Construction | 2021 |
| BLU Communications Ltd | Information & communication | 2022 |
| Blue Brick Residential Limited | Real estate | 2024 |
| Blue Click IT Limited | Information & communication | 2013 |
| Blue Earth Foods Limited | Manufacturing | 2008 |
| Blue Fish Logistics Limited | Professional & scientific | 2017 |
| Blue Fish Partnership Limited | Financial services | 2009 |
| Blue Monkey YT Ltd | Information & communication | 2013 |
| Blue Rope Consulting Limited | Administrative & support | 2018 |
| Blue Skye Property Management Limited | Hospitality | 2025 |
| Blue Tree Rentals Ltd | Real estate | 2024 |
| Blue Whale Finance Limited | Administrative & support | 2020 |
| Bluetorch Consulting Ltd | Information & communication | 2023 |
| Bluewater Spice Ltd | Hospitality | 2018 |
| Bluwave Community Services CIC | Transport & logistics | 2018 |
| Blythevale Limited | Real estate | 1993 |
| BM Machinery Limited | Manufacturing | 2022 |
| BN GAS & Heating Ltd | Construction | 2024 |
| Boardman Bikes Ltd | Manufacturing | 2005 |
| Boardman International Limited | Manufacturing | 2006 |
| Bob's Country Pizzas Limited | Hospitality | 2020 |
| Bob's Fruit & Vegetables Midlands Limited | Wholesale & retail | 2019 |
| Bobo Old Square Ltd | Hospitality | 2020 |
| Bobson's Building Maintenance Ltd | Construction | 2022 |
| Bobst UK & Ireland Ltd | Wholesale & retail | 1999 |
| Bobst UK Holdings Ltd | Professional & scientific | 1970 |
| Bodhi Barbers Limited | Other services | 2022 |
| Bodhi's Place Coffee House Limited | Hospitality | 2025 |
| Bodyshot Boxing Ltd | Other services | 2021 |
| Boiler Room Bar Limited | Hospitality | 2024 |
| Bond Street Collection Ltd | Wholesale & retail | 2025 |
| Bone-It Limited | Information & communication | 2009 |
| Boog and Bear Ltd | Wholesale & retail | 2023 |
| Bookers Blanks Ltd | Wholesale & retail | 2022 |
| Boom Customs Limited | Transport & logistics | 2020 |
| Boom Transport Ltd | Transport & logistics | 2020 |
| Borderless Trade Group Limited | Other services | 2022 |
| Bordesley Multi-Academy Trust | Education | 2011 |
| Bordesley Park Weddings Limited | Hospitality | 2014 |
| Born to BE Blues Limited | Information & communication | 2025 |
| Boss Commercials Limited | Extraterritorial | 2020 |
| Boss Wash Ltd | Administrative & support | 2026 |
| Botany Bay Nurseries Limited | Agriculture & fishing | 1999 |
| Bottle & Cork Ltd | Hospitality | 2019 |
| Bound Together CIC | Health & social care | 2024 |
| Bow-Wow Stratford Limited | Other services | 2022 |
| Bowbrook Asset Management Limited | Real estate | 2004 |
| Bowcomm Ltd | Information & communication | 2012 |
| Bower House Associates Ltd | Professional & scientific | 2020 |
| Boxing & Fitness Community Interest Company | Arts & recreation | 2021 |
| BPS Nexus Ltd | Real estate | 2025 |
| Brading Songs Ltd | Arts & recreation | 2022 |
| Brainfade Limited | Arts & recreation | 2023 |
| Brainy Drops Ltd | Transport & logistics | 2025 |
| Brainywise Interiors and Finishers Limited | Construction | 2023 |
| Brandon Seaber Motorsport Design Ltd | Professional & scientific | 2023 |
| Bransons Cross Properties Ltd | Real estate | 2021 |
| Bransons Cross Truck Park Limited | Transport & logistics | 2007 |
| Brantybytes Ltd | Administrative & support | 2026 |
| Brava Cars Ltd | Wholesale & retail | 2024 |
| Bray Brothers Landscapes Limited | Other services | 2007 |
| Brazilian Spa Serenity Ltd | Health & social care | 2026 |
| Breakaway Leisure Ltd. | Administrative & support | 1998 |
| Breakfast & Company Leisure Limited | Hospitality | 2014 |
| Breese & Earle Electrical Services Limited | Construction | 1992 |
| Breezy Tech Ltd | Extraterritorial | 2018 |
| Brennan Consulting Ltd | Administrative & support | 2024 |
| Brenor Group Limited | Real estate | 2016 |