| Barry Riley & Sons Limited | Professional & scientific | 1968 |
| Bartley Green Pubs Limited | Hospitality | 2024 |
| Bartq Ltd | Transport & logistics | 2014 |
| Bascom Technologies Ltd | Information & communication | 2022 |
| Base Awnings & Blinds Ltd | Wholesale & retail | 2020 |
| Bases & UP Building and Maintenance Services Ltd | Construction | 2020 |
| Basford Autoparts Limited | Wholesale & retail | 2018 |
| Basheer Ahmad Ltd | Wholesale & retail | 2025 |
| Basra Capital Properties Ltd | Real estate | 2026 |
| Bassi Healthcare Limited | Professional & scientific | 2021 |
| Bassi PG Holdings Limited | Real estate | 2024 |
| Bassi Properties Private Ltd | Real estate | 2025 |
| BAT Aggregate Midlands Limited | Water & waste | 2016 |
| BAT Properties Limited | Real estate | 2019 |
| Bateman Construction Limited | Construction | 2021 |
| Bath and District Pharmacy Limited | Wholesale & retail | 1996 |
| Bath Property Development Ltd | Real estate | 2025 |
| Bath Street Boxes Limited | Manufacturing | 1991 |
| Bathgate & Co. (Cork) Limited | Extraterritorial | 2012 |
| Batsby Recycling and Waste Collection Ltd | Water & waste | 2026 |
| Bay Professional Limited | Other services | 2009 |
| Bay Tree Property Services (Midlands) Limited | Construction | 2015 |
| BAY160 Limited | Real estate | 2020 |
| BAY38 Limited | Wholesale & retail | 2026 |
| Bayley Brothers Logistics Limited | Transport & logistics | 2022 |
| Bayley's Mechanical Services Limited | Manufacturing | 2013 |
| Bayley's Properties Limited | Households | 2025 |
| Bayside Aesthetics Walsall Ltd | Other services | 2023 |
| BB Roofing Developments Limited | Construction | 2016 |
| BB Roofing Solutions Limited | Construction | 2016 |
| BBA Building & Roofing Company Ltd | Construction | 2024 |
| BBA Property Investors Ltd | Construction | 2025 |
| Bbam Worldwide Ltd | Wholesale & retail | 2025 |
| BBH Holdings Limited | Financial services | 2024 |
| BBI Limited | Transport & logistics | 2019 |
| BBL Building Ltd | Construction | 2026 |
| BBL One Ltd | Extraterritorial | 2008 |
| BBL Two Ltd | Manufacturing | 1961 |
| Bbml Limited | Transport & logistics | 2025 |
| BBS Electrical & Security Limited | Construction | 2021 |
| BC Plumbing & Heating (Midlands) Limited | Construction | 2009 |
| BC Tigers Martial Arts Super Centre Ltd | Arts & recreation | 2022 |
| BCB Care Limited | Professional & scientific | 2019 |
| BCD Connected Ltd | Wholesale & retail | 2025 |
| Bcdancehub C.I.C. | Arts & recreation | 2024 |
| BCP Homes Ltd | Real estate | 2023 |
| BCP Management Ltd | Hospitality | 2025 |
| Bcpo Ltd | Wholesale & retail | 2025 |
| BD Plastering Surfaces Limited | Construction | 2015 |
| BDA Consultancy Limited | Professional & scientific | 2026 |
| BDH Electrical Installations Ltd | Construction | 2025 |
| BDS Transport U.K. Ltd | Transport & logistics | 2025 |
| Bdsg Services Ltd | Construction | 2022 |
| BE Healthy Ltd | Hospitality | 2025 |
| BE Mcdade Limited | Professional & scientific | 2008 |
| BE Metal Fabrications Ltd | Manufacturing | 2021 |
| BE YOU Beauty & Aesthetics Ltd | Other services | 2025 |
| BE YOU Retail Ltd | Wholesale & retail | 2020 |
| Beach House Holidays Limited | Real estate | 2016 |
| Beacon Auto Centre Limited | Wholesale & retail | 2016 |
| Beacon Consultants Limited | Administrative & support | 2021 |
| Beacon Interiors Ltd | Extraterritorial | 2016 |
| Beacon Park Farm Biomass Ltd | Manufacturing | 2020 |
| Beacon Park Farm Ltd | Agriculture & fishing | 2018 |
| Beaden Powerlec Limited | Construction | 1997 |
| Beagiee Limited | Real estate | 2022 |
| Beagio Ltd | Health & social care | 2021 |
| Bean and Baked Limited | Wholesale & retail | 2018 |
| Bean N Baked Ltd | Wholesale & retail | 2017 |
| Bear Witness Music Marketing Ltd | Professional & scientific | 2023 |
| Beast Food Ltd | Hospitality | 2022 |
| Beauimel Floors Limited | Construction | 2012 |
| Beaumont Contracts & Roofing Services Ltd | Construction | 2014 |
| Beaumont Electrical Services Team Ltd | Other services | 2017 |
| Beauty by Holly Ltd | Other services | 2020 |
| Beauty Choice Ltd | Wholesale & retail | 2025 |
| Beauty Clinic&Training by Andra.O Limited | Other services | 2023 |
| Becca Fitness Sports Massage Limited | Other services | 2025 |
| Becee Healthcare Solutions Ltd | Health & social care | 2024 |
| Beckett 1902 Holdings Limited | Real estate | 2020 |
| Beckett Abrasives Limited | Wholesale & retail | 1971 |
| Beckett Industrial Supplies Limited | Extraterritorial | 1983 |
| Becky Enterprise Ltd | Wholesale & retail | 2021 |
| Beds & Wardrobes 4 U Limited | Wholesale & retail | 2023 |
| Bedworth Freehold Ltd | Real estate | 2022 |
| Bee-Bookkeeping Ltd | Professional & scientific | 2025 |
| Beech and SON Ltd | Construction | 2026 |
| Beech Court Management Company (Walsall) Limited | Households | 1982 |
| Beecha Ltd | Real estate | 2026 |
| Beedh and Sons Ltd | Real estate | 2025 |
| Beepro Cosmetics Ltd | Wholesale & retail | 2024 |
| Beeweb Holdings Limited | Financial services | 2026 |
| Beewell Consultant Ltd | Professional & scientific | 2023 |
| BEF Nova Ltd | Education | 2021 |
| Beghal Bites Ltd | Hospitality | 2025 |
| Bekani Ltd | Health & social care | 2018 |
| Beks Fish and Chips Ltd | Hospitality | 2018 |
| Beks Kebabs Limited | Hospitality | 2021 |
| Beks Property Company Limited | Real estate | 2018 |
| Belfrey Gardens UK Limited | Real estate | 2024 |