| Blossomfield Park Management Company Limited | Real estate | 2022 |
| Blossomfield Residents RTM Company Limited | Real estate | 2010 |
| Blossomfields Residents Management Company Limited | Households | 2017 |
| Blossomgrove Housing Ltd | Real estate | 2026 |
| Blossoming Lotus 668 Ltd | Hospitality | 2025 |
| Blossompharm Ltd | Health & social care | 2015 |
| Blossoms Healthcare West Midlands Limited | Health & social care | 2023 |
| Blossoms Holdings Ltd | Financial services | 2022 |
| Blossoms in the Wood Limited | Health & social care | 2025 |
| Blossoms on the Common Limited | Education | 2017 |
| Bloswood Limited | Information & communication | 2008 |
| Blow Water .Co Ltd | Hospitality | 2022 |
| Blowers Green Park Estate Management Ltd | Real estate | 2025 |
| Blowers Hairdressing Limited | Other services | 2004 |
| Bloxbase Group Ltd | Financial services | 2024 |
| Bloxbase Ltd | Construction | 2022 |
| Bloxbase Portfolio Ltd | Real estate | 2025 |
| Bloxham Palmer Limited | Construction | 2008 |
| Bloxwich Nail Bar Ltd | Other services | 2024 |
| BLR Business Consulting Ltd | Professional & scientific | 2023 |
| BLS Site Supplies Limited | Construction | 2025 |
| Blsm LLP | | 2015 |
| BLU Bell Healthcare Limited | Other services | 2008 |
| BLU City Group Ltd | Construction | 2023 |
| BLU Investments Ltd | Real estate | 2014 |
| BLU Magic Catering Limited | Hospitality | 2015 |
| BLU Magic Sauces Ltd | Manufacturing | 2023 |
| BLU Sky Retail Investments Ltd | Real estate | 2025 |
| Blu's Chip Shop Limited | Hospitality | 2024 |
| Blu-J Ltd | Professional & scientific | 2019 |
| BLU2BERRY Limited | Professional & scientific | 2022 |
| BLU3 Architecture Ltd | Professional & scientific | 2022 |
| Bluarc WD Ltd | Construction | 2022 |
| Bluark Construction Ltd | Construction | 2022 |
| Blubrick Housing Ltd | Real estate | 2025 |
| Blucando Limited | Information & communication | 2014 |
| Blue Ananke Limited | Wholesale & retail | 2020 |
| Blue Ants Ltd | Hospitality | 2024 |
| Blue Apple Group Ltd | Wholesale & retail | 2025 |
| Blue Apple Security Limited | Administrative & support | 2025 |
| Blue Aqua Investments Limited | Manufacturing | 2019 |
| Blue Arrow Express Limited | Transport & logistics | 2025 |
| Blue Arrow Properties (Birmingham) Ltd | Real estate | 2016 |
| Blue Beam Constructions Ltd | Construction | 2025 |
| Blue Bonnet Consulting Ltd | Administrative & support | 2017 |
| Blue Box Business Storage Ltd | Administrative & support | 2017 |
| Blue Brick Corporation Ltd | Real estate | 2018 |
| Blue Brogue Pharm Limited | Wholesale & retail | 2014 |
| Blue Canyon Pubs Limited | Hospitality | 2026 |
| Blue Car Valeting Ltd | Wholesale & retail | 2025 |
| Blue Cat Properties Ltd | Real estate | 2024 |
| Blue Chestnut (UK) Ltd | Administrative & support | 2014 |
| Blue Chestnut Holdings Ltd | Financial services | 2023 |
| Blue Chip Studios Ltd | Information & communication | 2026 |
| Blue Circle Developments Limited | Construction | 1972 |
| Blue Circle Homes Ltd | Real estate | 2023 |
| Blue Circle Investments Limited | Extraterritorial | 1885 |
| Blue Circle Properties Limited | Extraterritorial | 1983 |
| Blue Circle Residential Estates Limited | Extraterritorial | 1993 |
| Blue Circle Share Shop Limited | Extraterritorial | 1962 |
| Blue City Aviation Group Limited | Transport & logistics | 2008 |
| Blue City Aviation Limited | Transport & logistics | 2004 |
| Blue Cloud Cyber Solutions Ltd | Information & communication | 2021 |
| Blue Cloud Homes Ltd | Real estate | 2022 |
| Blue Cooling (Bham) Limited | Construction | 2024 |
| Blue Crescent Homes Ltd | Real estate | 2025 |
| Blue Cube Chemicals (UK) Limited | Manufacturing | 2013 |
| Blue Dawn EOT Limited | Financial services | 2020 |
| Blue Diamond Recruitment Ltd | Administrative & support | 2025 |
| Blue Diamonds Professional Services Limited | Administrative & support | 2015 |
| Blue Door Care Services Limited | Real estate | 2024 |
| Blue Dotty Apron Ltd | Hospitality | 1990 |
| Blue Dragon Recovery & Transport Ltd | Transport & logistics | 2025 |
| Blue Dream Birmingham Limited | Manufacturing | 2025 |
| Blue Earth Power Ltd | Professional & scientific | 2025 |
| Blue Elephant Nursery Limited | Health & social care | 2016 |
| Blue Eskimo Solutions Limited | Administrative & support | 2003 |
| Blue Ethos Digital Ltd | Information & communication | 2017 |
| Blue Ethos Limited | Information & communication | 2009 |
| Blue Fitness Limited | Arts & recreation | 2025 |
| Blue Flame Trade Ltd | Wholesale & retail | 2019 |
| Blue Forge Real Estate Limited | Real estate | 2017 |
| Blue Fort Holdings Ltd | Financial services | 2023 |
| Blue GAS Services Limited | Energy | 2025 |
| Blue GAS Station Limited | Wholesale & retail | 2024 |
| Blue Gate Energy Ltd | Mining & quarrying | 2016 |
| Blue Giraffe Child Care (Knowle) Ltd | Health & social care | 2013 |
| Blue Glaze Windows and Doors Ltd | Construction | 2026 |
| Blue Glove Oven Cleaning Specialists Ltd | Administrative & support | 2022 |
| Blue Grand Ltd | Wholesale & retail | 2024 |
| Blue Havana Limited | Hospitality | 2026 |
| Blue Head Bird Ltd | Transport & logistics | 2018 |
| Blue Heart Power Ltd | Wholesale & retail | 2017 |
| Blue Heaven Desserts Limited | Hospitality | 2019 |
| Blue Horizon Trading Limited | Wholesale & retail | 2018 |
| Blue Horse PVT Limited | Real estate | 2020 |
| Blue Indemnity Brokers Limited | Financial services | 2025 |
| Blue INK Trust Ltd | Education | 2009 |
| Blue JAY Exchange CIC | Education | 2021 |
| Blue Kite Housing Ltd | Hospitality | 2025 |