| Bettalives C.I.C. | Education | 2021 |
| Better Bristol Ltd | Construction | 2024 |
| Betteryou Limited | Health & social care | 2005 |
| Beulah Property Investments Ltd | Real estate | 2026 |
| Bev&Clemoo Cleaning Company Limited | Administrative & support | 2025 |
| Beyond Just Words CIC | Other services | 2022 |
| Beyond Magnolia Limited | Construction | 1994 |
| Beyond the Ultimate Limited | Arts & recreation | 2012 |
| Beyond the Ultimate Store Limited | Wholesale & retail | 2020 |
| BF Testing Limited | Other services | 2024 |
| BFC Barnsley Ltd | Hospitality | 2025 |
| BFC Wombwell Ltd | Hospitality | 2023 |
| BFG Haulage Ltd | Transport & logistics | 2019 |
| BFR Pets Ltd | Wholesale & retail | 2025 |
| Bfree Properties Limited | Extraterritorial | 2023 |
| Bfree Property Solutions Limited | Real estate | 2023 |
| BFY Estates Limited | Professional & scientific | 2025 |
| BFY Global Limited | Financial services | 2025 |
| BG EYE Consulting Ltd | Health & social care | 2024 |
| BG Home Maintenance Ltd | Construction | 2026 |
| BG Motorsport & Logistics Ltd | Transport & logistics | 2025 |
| BG Roofing Services Ltd | Construction | 2023 |
| BH Electronics Ltd | Manufacturing | 2022 |
| BH Property (Yorkshire) Limited | Real estate | 2025 |
| BHB Glass Systems Ltd | Manufacturing | 2021 |
| BHF Corporate Services Limited | Administrative & support | 2017 |
| BHF Property Services Ltd | Real estate | 2022 |
| BHW & Sons Limited | Administrative & support | 2026 |
| Bickerton House Management Limited | Households | 2004 |
| Biddlestone Developments Ltd | Construction | 2026 |
| Big Fish Lettings Limited | Real estate | 2004 |
| Big Mamas (Barnsley) Ltd | Hospitality | 2016 |
| Big Pepper Ltd | Information & communication | 2011 |
| Big Red Rope Access Ltd | Manufacturing | 2014 |
| Big Red Track Service Limited | Construction | 2016 |
| Big Sky Creative Ltd | Information & communication | 2011 |
| Bigbox Group Ltd | Professional & scientific | 2019 |
| Bigdaddies Limited | Wholesale & retail | 2010 |
| Bigfoot Agency Limited | Information & communication | 2021 |
| Bigfoot Digital Limited | Information & communication | 2010 |
| Bigness Bizness Inc Ltd | Wholesale & retail | 2025 |
| Bignest Limited | Real estate | 2024 |
| Bigskye Horizons Ltd | Professional & scientific | 2015 |
| Bigwicks Limited | Wholesale & retail | 2017 |
| Biketyke Ltd | Wholesale & retail | 2022 |
| Bill Thomas Motorcycles Ltd | Wholesale & retail | 2002 |
| Billingley Village Community Association Limited | Arts & recreation | 2004 |
| Billington Fleet Management Limited | Manufacturing | 2008 |
| Billington Holdings PLC | Professional & scientific | 1989 |
| Billington Investment Management Limited | Real estate | 2023 |
| Billington Structures Limited | Manufacturing | 1981 |
| Billy BOY Holdings Limited | Financial services | 2017 |
| Billy's Coffee Bar Ltd | Hospitality | 2025 |
| Binary Controls Limited | Information & communication | 2021 |
| Binary Forge Limited | Extraterritorial | 2022 |
| Binary Forge Solutions Ltd | Information & communication | 2018 |
| Binary Innovations Limited | Information & communication | 2021 |
| Bingham Road (Freehold) Company Limited | Households | 2006 |
| Binks Developments Limited | Real estate | 2004 |
| Binks Executive Homes Limited | Construction | 1991 |
| Binks Ground Rents Limited | Real estate | 2017 |
| Binks Investments Ltd. | Real estate | 2004 |
| Binks Property Investments Ltd | Real estate | 2020 |
| Binocular Outlet Limited | Wholesale & retail | 2008 |
| Bio-Nuclear Services Limited | Health & social care | 1981 |
| Biotrans Ltd | Transport & logistics | 2026 |
| BIR4:10 Limited | Professional & scientific | 2025 |
| Birchwoods at Eccleshill Management Limited | Professional & scientific | 2004 |
| Birdwell Part Worn Tyres Ltd | Wholesale & retail | 2016 |
| Birdwell Properties Ltd | Real estate | 2024 |
| Birdwell Travellers Limited | Hospitality | 2024 |
| Birdwell Venue Limited | Hospitality | 2017 |
| Birreria Limited | Hospitality | 2020 |
| Birtle ODP Ltd | Health & social care | 2022 |
| Bishop Prime Limited | Construction | 2025 |
| Bison Frames (UK) Limited | Manufacturing | 2002 |
| Bison Holdings Limited | Financial services | 2019 |
| Bitillion Capital Ltd | Real estate | 2022 |
| BJ Housing Services Ltd | Real estate | 2019 |
| BJB Care Services Ltd | Health & social care | 2017 |
| BJB Consultancy Services Ltd | Extraterritorial | 2016 |
| BJC Property Holdings Ltd | Real estate | 2025 |
| BJD Roofing Specialists Limited | Construction | 2022 |
| Bjsautomechanics Ltd | Wholesale & retail | 2025 |
| BL 2002 Limited | Professional & scientific | 1952 |
| BL Barnsley Ltd | Hospitality | 2001 |
| BL Blackpool Ltd | Hospitality | 2006 |
| BL Carver Street Ltd | Hospitality | 2001 |
| BL Central Ltd | Hospitality | 2004 |
| BL Doncaster Ltd | Hospitality | 1997 |
| BL Hotels Ltd | Hospitality | 2021 |
| BL Lonestar Limited | Hospitality | 2018 |
| Bl-Sw Ltd | Health & social care | 2023 |
| Black Diamond Enterprises Limited | Real estate | 2003 |
| Black Diamonds Estates Limited | Real estate | 2024 |
| Black KAT Properties Limited | Hospitality | 2025 |
| Black Monk Enterprise Limited | Real estate | 2023 |
| Black Rooster Barnsley Limited | Hospitality | 2023 |
| Black Route Transport Ltd | Transport & logistics | 2025 |
| Black Technologies Limited | Information & communication | 2022 |