| Benchmark Grounds Maintenance Limited | Administrative & support | 2005 |
| Benchmark Support Services Limited | Extraterritorial | 2012 |
| Benfield Management Company Ltd | Households | 2024 |
| Beng Consultancy Limited | Administrative & support | 2011 |
| Bengal Vibes Limited | Hospitality | 2018 |
| Beornheard Ltd | Construction | 2021 |
| Berkeley Associates Tax Advisers Limited | Professional & scientific | 2004 |
| Bespoke British Pens Limited | Manufacturing | 2014 |
| Bespoke Consulting Limited | Professional & scientific | 2023 |
| Beta Research Ltd | Professional & scientific | 2016 |
| Better Breathing (International) Limited | Wholesale & retail | 2013 |
| Better by Nature Ltd | Health & social care | 1999 |
| Between the Vines Restaurant Limited | Hospitality | 2026 |
| Beyond Darwin Ltd | Professional & scientific | 2022 |
| Bidford Landscapes Limited | Administrative & support | 2025 |
| Big Red Recruitment (Midlands) Limited | Administrative & support | 2009 |
| Big Red Recruitment Group Limited | Financial services | 2020 |
| Big Splash Little Splash LLP | | 2020 |
| Bigwood Fine Art Auctioneers Ltd | Extraterritorial | 2021 |
| Bilston & Longford Limited | Construction | 1949 |
| Biltomm's Biltong Ltd | Wholesale & retail | 2022 |
| Bimo.Handmade Ltd | Manufacturing | 2021 |
| Binary Voice Limited | Information & communication | 2011 |
| Bio-Vent Systems Limited | Administrative & support | 2020 |
| Bioincyte Ltd | Information & communication | 2020 |
| Birmingham Press Club,Limited(The) | Other services | 1912 |
| Bishopton Park Residents Management Company Limited | Other services | 2009 |
| Bizgymz Limited | Professional & scientific | 2005 |
| BJM Consultancy (Cotswolds) Limited | Professional & scientific | 2025 |
| Black Bull Capital Limited | Financial services | 2024 |
| Black Bull Capital Partners Ltd | Financial services | 2022 |
| Black Hole Studios Ltd | Information & communication | 2025 |
| Black Sheep Barbers Limited | Extraterritorial | 2012 |
| Black TIE UXO Ltd | Professional & scientific | 2026 |
| Blacklight Systems Ltd | Information & communication | 2016 |
| Blackminster Limited | Professional & scientific | 2005 |
| Blade Details Limited | Administrative & support | 2025 |
| Bladon Technology Limited | Administrative & support | 2011 |
| Blake Social Ltd | Professional & scientific | 2020 |
| BLD Consultancy Services Limited | Professional & scientific | 2019 |
| Blenheim Road Holdings Limited | Financial services | 2016 |
| Blethryn Limited | Financial services | 2017 |
| Blieu Co Ltd | Professional & scientific | 2026 |
| Bloomery (Broadway) Limited | Wholesale & retail | 2019 |
| Bloomfield Design & Build Ltd | Construction | 2026 |
| Bloomstone Living Ltd | Real estate | 2025 |
| Blue Fabric Ltd | Information & communication | 2025 |
| Blue Mast Consulting Ltd | Administrative & support | 2013 |
| Blue Nexus Marketing Limited | Professional & scientific | 2025 |
| Blue Slate Housing Ltd | Real estate | 2025 |
| Blue Tide Holdings Ltd | Other services | 2017 |
| Bluebell (SUA) Management Company Ltd | Real estate | 2023 |
| Bluebell Lawns (Pebworth) Management Company Limited | Households | 2013 |
| Blueeyed Digital Marketing Limited | Professional & scientific | 2011 |
| Blueoak Health Limited | Health & social care | 2025 |
| BOB Thomson Coaching and Mediation Limited | Professional & scientific | 2024 |
| Bobby Browns Limited | Hospitality | 1982 |
| Bobbys Stratford Ltd | Hospitality | 2020 |
| Boev Consultancy Ltd | Information & communication | 2005 |
| Bold Construction Midlands Limited | Construction | 2023 |
| Bold Heron Berkswell Ltd | Construction | 2024 |
| Bold Projects Group Limited | Financial services | 2023 |
| Bolo Bolo Limited | Hospitality | 2023 |
| Bolthole Holidays Limited | Hospitality | 2024 |
| Bond Cars Limited | Wholesale & retail | 1999 |
| Bonify Ltd | Construction | 2025 |
| Bonner Construction Limited | Construction | 2018 |
| Bonnie Ventures Ltd | Information & communication | 2026 |
| Borderlines Brewing Company Limited | Manufacturing | 2023 |
| Bordon Homes Limited | Construction | 2025 |
| Borro IT Ltd | Information & communication | 2022 |
| Bothwell Gate (Management Company) Limited | Construction | 2023 |
| Bothwick Sands Ltd | Other services | 2022 |
| Boundary Court Residents Management Limited | Households | 2020 |
| Boundary-Lines Fencing Ltd | Professional & scientific | 2014 |
| Boutique Marquees Ltd | Administrative & support | 2017 |
| Bovey Castle Property Limited | Hospitality | 2015 |
| BOW Street Trading Limited | Wholesale & retail | 2011 |
| Bowling Green Halford Limited | Households | 2023 |
| Box Brownie Coffee Limited | Hospitality | 2019 |
| Box Clever Digital Limited | Information & communication | 2013 |
| Box Three Group Limited | Professional & scientific | 2012 |
| Box Three Studio Limited | Information & communication | 2012 |
| Boyds Accountants Limited | Professional & scientific | 2020 |
| BPS Co. (Properties) Ltd | Extraterritorial | 2022 |
| Bradley Murphy Design Limited | Professional & scientific | 2011 |
| Braggington Pastures Ltd | Agriculture & fishing | 2026 |
| Brand Alchemy Limited | Professional & scientific | 2001 |
| Brandfather Limited | Professional & scientific | 2019 |
| Breas Europe Limited | Health & social care | 2014 |
| Breas Medical Limited | Manufacturing | 2010 |
| Breas Technologies (UK) Limited | Financial services | 2014 |
| Bridgestar Limited | Real estate | 2017 |
| Bright Equipment Limited | Extraterritorial | 1999 |
| Bright Futures Ehcp Limited | Education | 2025 |
| Bright Machinery Ltd | Wholesale & retail | 2013 |
| Bright Property Group Limited | Real estate | 2017 |
| Bright Spark Electrical Installations Ltd | Manufacturing | 2016 |
| Brighter Lighting UK Limited | Manufacturing | 2020 |
| Brindley Hampton Limited | Real estate | 2021 |