| Bowes Training Limited | Education | 2024 |
| Bowman Delvigne Ltd | Real estate | 2014 |
| Bowman Travel Limited | Transport & logistics | 2012 |
| Bowmans Leisure Limited | Agriculture & fishing | 2001 |
| Bowood Care Limited | Professional & scientific | 2003 |
| Bowson Lettings Limited | Real estate | 2002 |
| Bowson Real Estate LLP | | 2012 |
| Bowson Venture Limited | Real estate | 2017 |
| Bowzercorp Ltd | Financial services | 2024 |
| Box & Beam Ltd | Construction | 2025 |
| Box Beautiful Ltd | Other services | 2014 |
| Box Leisure Ltd | Hospitality | 2016 |
| Box&Build. Ltd | Arts & recreation | 2024 |
| Boxizon Ltd | Wholesale & retail | 2025 |
| Boxkite Ltd | Information & communication | 2013 |
| Boxsafe Limited | Extraterritorial | 2008 |
| Boyapati Ltd | Wholesale & retail | 2024 |
| Boyd Developments North East Limited | Real estate | 2005 |
| Boyle Bloodstock Ltd | Arts & recreation | 2024 |
| Bozhin Property Limited | Construction | 2023 |
| Bozronson Ltd | Wholesale & retail | 2024 |
| BP & Daughters Limited | Financial services | 2024 |
| BP Physiotherapy Ltd | Health & social care | 2023 |
| BPM Distribution Limited | Wholesale & retail | 2026 |
| Bpmr Ltd | Professional & scientific | 2008 |
| BPT (Assured Homes) Limited | Real estate | 1994 |
| BPT (Bradford Property Trust) Limited | Real estate | 1930 |
| BPT (Residential Investments) Limited | Real estate | 1940 |
| BPT Limited | Real estate | 1928 |
| BR Aggregates Recycling Ltd | Water & waste | 2024 |
| BR MRF Ltd | Water & waste | 2024 |
| BR Newcastle Ltd | Other services | 2020 |
| BR Organics Recycling Ltd | Water & waste | 2024 |
| BR Properties Limited | Real estate | 2012 |
| Brace Letting Ltd | Real estate | 2024 |
| Bracesworld Limited | Financial services | 2025 |
| Brack Burger Ltd | Hospitality | 2021 |
| Bracken Hill Property and Lettings Ltd | Households | 2024 |
| Brackenhoe Managing Company Limited | Extraterritorial | 2019 |
| Brackenshaw Limited | Construction | 2001 |
| Brad Channer Ltd | Professional & scientific | 2024 |
| Braddockmatthewsbarrett Limited | Administrative & support | 2011 |
| Bradley Copy Ltd | Professional & scientific | 2025 |
| Bradley Hall (Auctions) Limited | Real estate | 2018 |
| Bradley Hall (Birmingham) Limited | Real estate | 2024 |
| Bradley Hall (Fundraising) Ltd | Administrative & support | 2023 |
| Bradley Hall (Gosforth) Limited | Real estate | 2019 |
| Bradley Hall (Manchester) Limited | Real estate | 2025 |
| Bradley Hall (Northumberland) Limited | Real estate | 2019 |
| Bradley Hall (Oxfordshire) Limited | Real estate | 2026 |
| Bradley Hall (Sunderland) Limited | Real estate | 2022 |
| Bradley Hall (Teesside) Ltd | Real estate | 2023 |
| Bradley Hall (Yorkshire) Limited | Real estate | 2020 |
| Bradley Hall Limited | Professional & scientific | 2007 |
| Bradleychrister Ltd | Construction | 2025 |
| Bradley’S Deliveries Ltd | Transport & logistics | 2026 |
| Bradwell Building & Roofing Ltd | Construction | 2015 |
| Bradwell Property Solutions Ltd | Real estate | 2026 |
| Brady & Martin Court Management Company Limited | Real estate | 1986 |
| Brady Spokes Ltd | Wholesale & retail | 2024 |
| Braelawn Limited | Professional & scientific | 2012 |
| Brafferton Hyde Holdings Limited | Professional & scientific | 2015 |
| Braidsandbeads Ltd | Other services | 2025 |
| Brain Glitter Boss Limited | Education | 2025 |
| Braingum Limited | Wholesale & retail | 2025 |
| Brainy Stuff Ltd | Information & communication | 2013 |
| Bramble Environmental Limited | Water & waste | 2018 |
| BRAMBLE9 | Financial services | 2013 |
| Brambleshine Limited | Information & communication | 2025 |
| Brambling Properties Ltd | Real estate | 2019 |
| Bramtech Services Limited | Administrative & support | 2017 |
| Bramwell Court Residents Association (2013) Limited | Households | 2018 |
| Branch and Bone Ltd | Education | 2022 |
| Branch Artificial Ltd | Wholesale & retail | 2026 |
| Branch Management Ltd | Real estate | 2021 |
| Branching UP North Ltd | Hospitality | 2022 |
| Branchwood Ltd | Extraterritorial | 2003 |
| Branchwood NO.1 Ltd | Extraterritorial | 2011 |
| Branchwood NO.2 Ltd | Real estate | 2004 |
| Brand ELEV8TE Ltd | Information & communication | 2024 |
| Brand Muse Co. (NE) Limited | Extraterritorial | 2020 |
| Brand Your World Ltd | Professional & scientific | 2008 |
| Brandface Ltd | Professional & scientific | 2013 |
| Brandlife Marketing Solutions Limited | Professional & scientific | 2023 |
| Brandling 11 Limited | Financial services | 2024 |
| Brandling Carpets Ltd | Wholesale & retail | 1995 |
| Brandling Health Limited | Health & social care | 2019 |
| Brandling Park Limited | Hospitality | 2008 |
| Brankie Limited | Wholesale & retail | 2013 |
| Brannen Dental Limited | Health & social care | 2020 |
| Branta Consulting Ltd | Administrative & support | 2026 |
| Branta Recruitment Ltd | Administrative & support | 2025 |
| Brantingham Dental Ltd | Health & social care | 2023 |
| Branxiar Properties Limited | Real estate | 2023 |
| Branzino Restaurant Ltd | Hospitality | 2020 |
| Brar & Co Limited | Professional & scientific | 2010 |
| Brash Theatre Company Ltd | Arts & recreation | 2020 |
| Brass Dragonfly Estates Ltd | Real estate | 2025 |
| Brassmonkey International Ltd | Information & communication | 2016 |
| Bratz Salon Ltd | Other services | 2023 |