| Box Solutions Limited | Transport & logistics | 2024 |
| Box Twenty Consulting Engineers Limited | Professional & scientific | 2016 |
| Box-E Bristol Limited | Hospitality | 2016 |
| Boxarr Limited | Information & communication | 2003 |
| Boxbite Limited | Hospitality | 2026 |
| Boxed Energy Limited | Construction | 2012 |
| Boxed Heat Services Limited | Professional & scientific | 2021 |
| Boxed in Storage Ltd | Administrative & support | 2009 |
| Boxed in Storage Netham Limited | Transport & logistics | 2022 |
| Boxed Light Services Limited | Construction | 2017 |
| Boxed Management Services Limited | Professional & scientific | 2012 |
| Boxed Solutions Limited | Financial services | 2023 |
| Boxer CDM Solutions Ltd | Professional & scientific | 2016 |
| Boxing Company Ltd | Arts & recreation | 2020 |
| Boxkite Analysis Ltd | Professional & scientific | 2021 |
| Boxkite Software Ltd | Professional & scientific | 2022 |
| Boxlocal Ltd | Wholesale & retail | 2021 |
| Boxoffice Films Limited | Arts & recreation | 2012 |
| Boxwell Farms (Tetbury) Limited | Agriculture & fishing | 1973 |
| Boxwood IT Ltd | Information & communication | 2011 |
| Boyaci Limited | Information & communication | 2021 |
| Boyce Bros (Jb&Lb) Ltd | Construction | 2018 |
| Boyce Bros Ltd | Hospitality | 2016 |
| Boyce's Holdings Limited | Financial services | 2026 |
| Boyce's Property Limited | Real estate | 2026 |
| Boycely Developments Ltd | Construction | 2017 |
| Boyd Project Management Limited | Professional & scientific | 2012 |
| BOZ Trans Limited | Transport & logistics | 2020 |
| Bozbayir Exec Travel Ltd | Transport & logistics | 2026 |
| Bozic Property Limited | Real estate | 2023 |
| BP Direct Ltd | Manufacturing | 2025 |
| BP Installations (Bristol) Ltd | Construction | 2013 |
| BP Locum Ltd | Professional & scientific | 2020 |
| BP Newsagents Ltd | Wholesale & retail | 2019 |
| BP Originals Ltd | Information & communication | 2025 |
| BP Scaffolding Services Ltd | Construction | 2025 |
| BP3 Global Limited | Information & communication | 2014 |
| Bpartner Properties Ltd | Real estate | 2021 |
| Bpartner Services & Trade Ltd | Wholesale & retail | 2012 |
| BPB Accountancy Ltd | Professional & scientific | 2015 |
| BPB Architect Ltd | Professional & scientific | 2021 |
| BPC Kensington Limited | Hospitality | 2009 |
| BPD Developments Ltd | Construction | 2024 |
| BPD Properties Ltd | Real estate | 2026 |
| BPF Washroom Systems Ltd | Manufacturing | 1999 |
| BPH Content Ltd | Arts & recreation | 2025 |
| BPR Property Management Limited | Households | 2019 |
| Bprj Product Development Limited | Information & communication | 2011 |
| BPUP2L 1 Limited | Energy | 2026 |
| Bpuwl 18 Limited | Energy | 2022 |
| Bpuwl 23 Limited | Energy | 2022 |
| Bpuwl 25 Limited | Energy | 2022 |
| Bpuwl 29 Limited | Energy | 2023 |
| Bpuwl 30 Limited | Energy | 2023 |
| BPX Property Limited | Real estate | 2024 |
| BQC Limited | Administrative & support | 2012 |
| BR Coffee Events Ltd | Administrative & support | 2022 |
| BR6 Limited | Professional & scientific | 2007 |
| Bra.Bristol Ltd | Hospitality | 2020 |
| Brabantia (U.K.) Limited | Wholesale & retail | 2003 |
| Brabazon Cars Ltd | Transport & logistics | 2023 |
| Brabazon Digital Ltd | Professional & scientific | 2021 |
| Brabazon Park Management Company Limited | Administrative & support | 2007 |
| Brabazon Walker Limited | Professional & scientific | 2018 |
| Braboco Limited | Construction | 1995 |
| Brace Trust Services Limited | Professional & scientific | 1994 |
| Brace Trustee Limited | Other services | 2022 |
| Braces Shooting Limited | Wholesale & retail | 2013 |
| Braces Shooting Range Limited | Arts & recreation | 2019 |
| Bracey Co Limited | Construction | 2025 |
| Bracey Cottle Investments Limited | Professional & scientific | 1991 |
| Brachyderm Limited | Professional & scientific | 2014 |
| Braci Co Ltd | Hospitality | 2024 |
| Brack Management Company Ltd | Households | 2019 |
| Bracken Down Limited | Agriculture & fishing | 2002 |
| Bracken Hill (Garden and Grounds) Management Company Ltd | Households | 2011 |
| Bracken Hill (Old English Garden) Management Company Ltd | Households | 2012 |
| Brackenbury Manor (Histon) Management Company Limited | Real estate | 2007 |
| Brackenwood (Portishead) Management Company Limited | Households | 2015 |
| Brackley Limited | Wholesale & retail | 2016 |
| Brackley Pet Healthcare Limited | Extraterritorial | 2010 |
| Brackmills Point Management Company Limited | Real estate | 2017 |
| Bracknell One Limited | Extraterritorial | 2010 |
| Bracknell Two Limited | Extraterritorial | 2010 |
| Brada Associates Limited | Information & communication | 2020 |
| Bradborne Ltd | Professional & scientific | 2023 |
| Braddon Group Limited | Financial services | 2021 |
| Bradford Challen Group Ltd | Construction | 2026 |
| Bradfords Lane (Newent) Management Company Limited | Households | 2022 |
| Bradley Crescent Management Company Limited | Real estate | 2024 |
| Bradley Flooring Ltd | Construction | 2015 |
| Bradley FRY IFA Ltd | Financial services | 2016 |
| Bradley Garage Limited | Wholesale & retail | 2012 |
| Bradley House (Bristol) Management Company Limited | Households | 2006 |
| Bradley Stoke Electrical Ltd | Construction | 2013 |
| Bradley Stoke Physiotherapy Limited | Health & social care | 2003 |
| Bradley Stoke Pvcu Window Repairs Limited | Construction | 2003 |
| Bradley Stoke Radio Limited | Information & communication | 2011 |
| Bradley Stoke Tour & Travel Ltd | Transport & logistics | 2018 |
| Bradrock Ltd | Real estate | 2025 |