| Bowbrook Property Limited | Real estate | 2025 |
| Bowden Business Consulting Ltd | Professional & scientific | 2025 |
| Bowdenwholesale Ltd | Wholesale & retail | 2024 |
| Bowdler Farms Limited | Agriculture & fishing | 2016 |
| Bowen Carpentry & Joinery Ltd | Construction | 2016 |
| Bowker Associates Limited | Real estate | 1997 |
| Bowling Green Lane Management Company Limited | Real estate | 2008 |
| Bowne Street (Sutton in Ashfield) Management Limited | Households | 2007 |
| Box Modular Pods Limited | Extraterritorial | 2021 |
| Box Tube Ltd | Transport & logistics | 2022 |
| Boxing Hand Grenade Ltd | Wholesale & retail | 2019 |
| Boycast Limited | Agriculture & fishing | 1996 |
| BPF Cooker Services Ltd | Other services | 2021 |
| BPF Holdings Ltd | Financial services | 2020 |
| Bracksly Limited | Professional & scientific | 2011 |
| Bradun Limited | Real estate | 1988 |
| Braid Society Limited | Education | 2013 |
| Bramcote Manor Management Company Limited | Real estate | 2016 |
| Branded Barbers Ltd | Other services | 2025 |
| Bratton Grange Management Company Ltd | Households | 2020 |
| Breaden Property Limited | Construction | 2025 |
| Breen Design Ltd | Professional & scientific | 2021 |
| Breese Architecture Ltd | Professional & scientific | 2024 |
| Breeze Plumbing & Heating Limited | Construction | 2015 |
| Brejaki Holdings | Financial services | 2020 |
| Brendan Reedy Limited | Professional & scientific | 2011 |
| Brendon Bailey Park Services Ltd | Professional & scientific | 2014 |
| Brewser Ltd | Wholesale & retail | 2021 |
| Brian Radford Investments Limited | Financial services | 1987 |
| Briary Fields (Margate) Management Company Limited | Real estate | 2020 |
| Brickfield Flats (Shrewsbury) Limited | Households | 1973 |
| Brickvale Developments Limited | Real estate | 2015 |
| Bridge and Temporary Works Hub Ltd | Professional & scientific | 2025 |
| Bridge Farm Livery Yard Limited | Administrative & support | 2021 |
| Bridge Financial Limited | Professional & scientific | 2015 |
| Bridge Forwarding (UK) Limited | Transport & logistics | 2016 |
| Bridge House (Thelwall) Management Company Limited | Real estate | 2016 |
| Bridge Search Limited | Information & communication | 2025 |
| Bridges & Sons Limited | Construction | 2010 |
| Bridgesforsale Ltd | Construction | 2012 |
| Bridgeway IT Project Services Ltd | Information & communication | 2012 |
| Bridgework Consulting Limited | Administrative & support | 2007 |
| Brierley Crystal (Tipton) Management Limited | Households | 2003 |
| Bright-Arch Care Solutions Ltd | Professional & scientific | 2026 |
| Brighter Days (Shropshire) CIC | Professional & scientific | 2026 |
| Brighter Teaching IOM Limited | Education | 2023 |
| Brighter Teaching Limited | Education | 2021 |
| Brims Books Limited | Professional & scientific | 2017 |
| Brindley Property Ltd | Real estate | 2018 |
| Britalco Engineering Limited | Manufacturing | 1978 |
| Brite Start Facilities Limited | Administrative & support | 2026 |
| British Focusing Association CIC | Health & social care | 2013 |
| BRITSCHOOL4U Ltd | Education | 2022 |
| Broad Oaks RTM Company Limited | Households | 2021 |
| Broadgate House Management Limited | Households | 2003 |
| Broadleigh Park (Tavistock) Management Company Limited | Households | 2019 |
| Broadley & Parton Holdings Limited | Financial services | 2025 |
| Broadley & Parton Limited | Real estate | 2011 |
| Broadway Poultry Limited | Agriculture & fishing | 2017 |
| Broco UK Limited | Real estate | 2005 |
| Brok Footwear Limited | Wholesale & retail | 2013 |
| Bromley Court Limited | Households | 2008 |
| Bromleys Court Management Company (Flats 1 2 3 9 and 10) Limited | Households | 2017 |
| Bron Castell Management Company Limited | Real estate | 2005 |
| Bronrhiw Ltd | Professional & scientific | 2019 |
| Brook Manor (Alphington) Management Company Limited | Real estate | 2023 |
| Brookfield Meadow Limited | Households | 2021 |
| Brookfield Rise Management Company Limited | Households | 2016 |
| Brookgate Plealey Ltd | Professional & scientific | 2012 |
| Brookland Reid Ltd | Information & communication | 2014 |
| Brooklands (Willenhall) Management Company Limited | Households | 2003 |
| Brooklands Shrewsbury Limited | Hospitality | 2019 |
| Brooklands Sports Bar and Venue Ltd | Hospitality | 2026 |
| Brooks Place Residents Management Company Limited | Households | 2019 |
| Brookside Garden Machine Centre Ltd | Other services | 2021 |
| Brookwood Herefordshire Property Ltd | Real estate | 2026 |
| Broomhill (Christow) Management Company Limited | Households | 2006 |
| Brothers & Sisters Ltd | Hospitality | 2025 |
| Broughton (Atterbury) Management Company Limited | Households | 2006 |
| Brown & Murray Limited | Construction | 2003 |
| Brown and Ginger Limited | Wholesale & retail | 2017 |
| Brown Lounge Limited | Arts & recreation | 2012 |
| Browns of Shrewsbury Limited | Other services | 2011 |
| Browns of WEM (Developments) Limited | Real estate | 1965 |
| Bruces Executive Travel Limited | Transport & logistics | 2012 |
| Bryceland Limited | Professional & scientific | 2009 |
| Bryn Gobaith Management Company Limited | Real estate | 2022 |
| BSA 360 Ltd | Arts & recreation | 2026 |
| BSD Property (Shrewsbury) Limited | Real estate | 2019 |
| Bst&T Consultancy Services Limited | Professional & scientific | 2020 |
| BTB Network Ltd | Education | 2024 |
| BTS Consultants Limited | Education | 2007 |
| Buckfields Lyme Regis Management Limited | Households | 2012 |
| Bucks Head Limited | Hospitality | 2010 |
| Buckshaw Central Management Company Limited | Households | 2015 |
| Buckweaver Limited | Information & communication | 2022 |
| Build a Bridge Ltd | Professional & scientific | 2025 |
| Build IT International | Construction | 2005 |
| Build Supply Services Ltd | Wholesale & retail | 2026 |
| Building Media Limited | Information & communication | 2024 |