| Boxfresh Property Limited | Real estate | 2024 |
| Boxiecube Limited | Wholesale & retail | 2026 |
| Boxton Homes Limited | Construction | 2023 |
| Boye London Limited | Construction | 2021 |
| Boyes Design Limited | Manufacturing | 2021 |
| BP Facilities Management Ltd | Administrative & support | 2024 |
| BP Kitchen Ltd | Hospitality | 2025 |
| BP Media Limited | Administrative & support | 2006 |
| BP Pizzah &Kebabs Ltd | Hospitality | 2025 |
| BP& Kebabs Ltd | Hospitality | 2024 |
| BP4U Group Ltd | Wholesale & retail | 2021 |
| Bpai Limited | Professional & scientific | 2017 |
| Bpainting Decorating and Joinery Ltd | Construction | 2025 |
| Bpcaa Services Limited | Hospitality | 2019 |
| Bpenterprise Limited | Wholesale & retail | 2026 |
| BPF Academy Ltd | Education | 2021 |
| BPM (Brooks Project Management) Ltd | Professional & scientific | 2017 |
| BPM Holdings (2015) Limited | Financial services | 2015 |
| BPT Security Systems (UK) Limited | Wholesale & retail | 2005 |
| BPU Care Limited | Professional & scientific | 2013 |
| BPU Consultants Ltd | Professional & scientific | 2020 |
| BPW Retail Services Ltd | Wholesale & retail | 2025 |
| BR Live Ltd | Information & communication | 2025 |
| BR Music Group Ltd | Arts & recreation | 2004 |
| BR0WS Beauty Limited | Other services | 2019 |
| Braai King Delight Limited | Hospitality | 2014 |
| Braced Consulting Ltd | Professional & scientific | 2025 |
| Bracenfix Ltd | Wholesale & retail | 2025 |
| Bracha Music Limited | Education | 2011 |
| Bracken Events Limited | Administrative & support | 2012 |
| Bracken Hill Court at Ackworth Management Company Limited | Households | 2005 |
| Brackenbury Sgroot Properties Ltd | Real estate | 2026 |
| Brackley Hearing Centre Ltd | Wholesale & retail | 2023 |
| Brackley Holdings Limited | Financial services | 2022 |
| Brackley Investments Limited | Real estate | 1995 |
| Brackley Property Developments Limited | Construction | 2015 |
| Bradair Aviation Consultancy Limited | Transport & logistics | 1999 |
| Bradax CT Solutions Ltd | Professional & scientific | 2025 |
| Bradbery & Cooke Limited | Manufacturing | 2010 |
| Bradborough (MG 2000) Limited | Professional & scientific | 1999 |
| Bradbury Projects Limited | Professional & scientific | 1974 |
| Bradbury's of Ravenshead Limited | Wholesale & retail | 2025 |
| Bradburys Monaco Ltd | Wholesale & retail | 2014 |
| Bradetrade Construction Ltd | Construction | 2024 |
| Bradfield Storage Handling Limited | Manufacturing | 1994 |
| Bradford Education Academy Limited | Education | 2025 |
| Bradgate Interiors Limited | Other services | 2014 |
| Bradley & Croll Building & Electrical Services Limited | Construction | 2016 |
| Bradley Gough Limited | Professional & scientific | 2022 |
| Bradley HR Solutions Limited | Administrative & support | 2017 |
| Bradley Professional Limited | Financial services | 2015 |
| Bradleys Bookshop Ltd | Wholesale & retail | 2026 |
| Bradmore Business Park Limited | Real estate | 2006 |
| Bradmore Developments Ltd | Construction | 2022 |
| Bradshaw & Bellini Ltd | Wholesale & retail | 2025 |
| Bradshaw & Parkin (Electrical Services) Limited | Construction | 2023 |
| Bradshaw AFC Limited | Financial services | 2017 |
| Bradshaw’S Fire and Flood Restoration Ltd | Construction | 2023 |
| Bradsoft Limited | Information & communication | 2003 |
| Bradstock Bourne (Holdings) Limited | Financial services | 2023 |
| Bradstock Bourne Limited | Financial services | 2002 |
| Bradu Trading Ltd | Transport & logistics | 2025 |
| Brady Solicitors Limited | Professional & scientific | 2008 |
| Braemore Construction Ltd | Construction | 2015 |
| Brahmora Technologies Private Limited | Information & communication | 2026 |
| Braids by Achiis Ltd | Education | 2025 |
| Brain Chill Limited | Hospitality | 2013 |
| Brainbox Ideas UK Ltd | Manufacturing | 2024 |
| Brainbug Ltd | Professional & scientific | 2018 |
| Brainchain Limited | Information & communication | 2025 |
| Braith Build Ltd | Construction | 2024 |
| Brake Caliper Specialists Limited | Wholesale & retail | 2018 |
| Bramall Quicks Dealerships Limited | Wholesale & retail | 1965 |
| Bramall Quicks Limited | Wholesale & retail | 1919 |
| Bramante Caring Hands Ltd | Health & social care | 2026 |
| Bramble & Wagg Estates Ltd | Real estate | 2023 |
| Bramble & Wagg Ltd | Professional & scientific | 2019 |
| Brambledown Gifts Limited | Wholesale & retail | 2025 |
| Brambridge Limited | Real estate | 1986 |
| Bramcote Swimming Club Limited | Arts & recreation | 2015 |
| Bramdale Limited | Wholesale & retail | 2004 |
| Bramily Ltd | Professional & scientific | 2023 |
| Bramleigh Building Services Ltd | Construction | 2014 |
| Bramley Close (Nottingham) Management Limited | Households | 2015 |
| Bramley Electrical Limited | Construction | 2005 |
| Bramley House Property Limited | Other services | 2017 |
| Bramley-Maye Design Limited | Professional & scientific | 2013 |
| Brammak Services Ltd | Construction | 2024 |
| Brampton Associates Limited | Real estate | 2001 |
| Bramshott Place Management Limited | Administrative & support | 2007 |
| Branatiff Limited | Energy | 2015 |
| Brancaster Capital Ltd | Professional & scientific | 2013 |
| Branch & Bloom Gardening CIC | Other services | 2021 |
| Branch OUT Learning Hive Ltd | Education | 2026 |
| Brand Accountancy Limited | Professional & scientific | 2022 |
| Brand Amplify Ltd | Professional & scientific | 2019 |
| Brand Essence Limited | Professional & scientific | 2008 |
| Brandbuddy Marketing Ltd | Information & communication | 2025 |
| Branded Gear Limited | Wholesale & retail | 2013 |
| Brandedbiz Limited | Wholesale & retail | 2025 |