| Bangar & Rehman Estates Ltd | Real estate | 2026 |
| Bangar & Rehman Freeholds Ltd | Real estate | 2026 |
| Bani Estates Ltd | Real estate | 2025 |
| Banjavilfx Ltd | Financial services | 2026 |
| BANJEH2021 Ltd | Real estate | 2021 |
| Bank Check (U.K.) Limited | Professional & scientific | 1996 |
| Bankside Properties Limited | Real estate | 2024 |
| Bannister Autos Ltd | Wholesale & retail | 2022 |
| Bansal Private Office Limited | Financial services | 2025 |
| Bansal Property Holdings Ltd | Real estate | 2025 |
| Banso Ltd | Professional & scientific | 2015 |
| Banter Experiences Limited | Administrative & support | 2014 |
| Bantock Consulting Ltd | Information & communication | 2022 |
| Bantock Homes Limited | Construction | 2011 |
| Bantock Ltd | Transport & logistics | 2022 |
| Bantock Plumbing and Heating Limited | Construction | 2013 |
| Banyan Homes Limited | Construction | 2024 |
| BAO Corporations Ltd | Information & communication | 2023 |
| Bapu Homes Ltd | Real estate | 2021 |
| Bar Lane Retail Limited | Wholesale & retail | 2007 |
| Barakah Wedding Films Limited | Information & communication | 2026 |
| Baran Property Ltd | Real estate | 2021 |
| Barbers NO6 Ltd | Other services | 2023 |
| Barb’S Bunches Ltd | Wholesale & retail | 2026 |
| Barcelona Takeaway Ltd | Hospitality | 2018 |
| Bareera Accessories Ltd | Wholesale & retail | 2025 |
| Barefoot Sanctuary & Spa Ltd | Other services | 2026 |
| Baretta Ltd | Construction | 2025 |
| Barevive Laser and Skin Clinic Ltd | Other services | 2025 |
| Barfia Online Ltd | Wholesale & retail | 2017 |
| Bargain Beerz Ltd | Wholesale & retail | 2023 |
| Bargain Deals Direct 24/7 Ltd | Wholesale & retail | 2025 |
| Bargain DEPOT1 Ltd | Wholesale & retail | 2026 |
| Barker Pritchard Ltd | Real estate | 2025 |
| Barks and Trails Limited | Agriculture & fishing | 2025 |
| Barloft Ltd | Real estate | 1999 |
| Barlow Motors Limited | Wholesale & retail | 2005 |
| Barn & Festival Weddings Limited | Hospitality | 2023 |
| Barnett Holding Group Ltd | Financial services | 2025 |
| Barnett Management Services Ltd | Professional & scientific | 2021 |
| Barnett Stays Ltd | Real estate | 2025 |
| Barnex Ltd | Construction | 2026 |
| Barnhurst Lane Lions FC Limited | Arts & recreation | 2023 |
| Barnlife Investments Limited | Real estate | 2025 |
| Baronet Labs Limited | Information & communication | 2025 |
| Barratt Electrical Solutions Limited | Construction | 2017 |
| Barrel & Brand Limited | Wholesale & retail | 2024 |
| Barrels & Basket Limited | Wholesale & retail | 2026 |
| Barrett Group Holdings Ltd | Financial services | 2024 |
| Barrie Direct Payment Solutions Ltd | Professional & scientific | 2020 |
| Barrie Williams Carpet Services Limited | Wholesale & retail | 2011 |
| Barringmouth Ltd | Transport & logistics | 2019 |
| Barrow and Wells Ltd | Wholesale & retail | 2026 |
| Bart UK Real Estate Ltd | Real estate | 2024 |
| Bartholomew and Withers Publishing Ltd | Information & communication | 2018 |
| Bartlams Lettings Limited | Real estate | 2016 |
| Bartlams Limited | Real estate | 1998 |
| Bartley Ltd | Transport & logistics | 2022 |
| Barton Electrical (Midlands) Ltd | Construction | 2012 |
| Baruwa Healthcare Limited | Health & social care | 2018 |
| Basam Services Ltd | Wholesale & retail | 2023 |
| Basam Transport Ltd | Transport & logistics | 2023 |
| Baschurch Care Limited | Health & social care | 2013 |
| Base 25 | Education | 1998 |
| Base 8 Innovations+ Limited | Construction | 2026 |
| Base Aesthetics Limited | Other services | 2021 |
| Base Trident Limited | Professional & scientific | 2015 |
| Basecamp Business Solutions Ltd | Professional & scientific | 2017 |
| Basil & Crust Ltd | Extraterritorial | 2025 |
| Basil & Dough Ltd | Hospitality | 2025 |
| Basil N Crust Ltd | Extraterritorial | 2025 |
| Basil N Dough Ltd | Extraterritorial | 2025 |
| Basket Lane Limited | Wholesale & retail | 2026 |
| Basketo Limited | Wholesale & retail | 2023 |
| Basra Concrete Fence & Timber Ltd | Construction | 2025 |
| Basra Engineering Consultancy Ltd | Professional & scientific | 2025 |
| Basran Holdings Ltd | Financial services | 2022 |
| Bassat Group Limited | Hospitality | 2024 |
| Bassi Distribution Services Ltd | Transport & logistics | 2026 |
| Bassi Driveways Ltd | Construction | 2017 |
| Bassi Driving Solutions Ltd | Education | 2023 |
| Bassi Property Management Ltd | Real estate | 2019 |
| Bassi Transport Services Ltd | Transport & logistics | 2023 |
| Bast Properties Limited | Real estate | 2026 |
| Batepl Investments Limited | Health & social care | 2015 |
| Bates Carpentry Contractors Ltd | Manufacturing | 2019 |
| Batth Building Services Ltd | Construction | 2022 |
| Batth&Sons Ltd | Transport & logistics | 2023 |
| Battle Strength Academy Ltd | Health & social care | 2026 |
| Bauer Investment Holdings Limited | Real estate | 2025 |
| Bavect Ltd | Administrative & support | 2017 |
| BAX Construction (Roofing) Ltd | Construction | 2024 |
| BAX Construction Ltd | Construction | 2020 |
| Baxters Group Holdings Limited | Other services | 2019 |
| Baxters Group Limited | Real estate | 2019 |
| Bay Care Plus Limited | Health & social care | 2013 |
| Bay Properties Investments Ltd | Real estate | 2020 |
| Baya Technology Consulting Limited | Information & communication | 2024 |
| Bayley Needham Limited | Administrative & support | 2002 |
| Bayline Logistics Ltd | Transport & logistics | 2025 |