| Brightdark Consulting Limited | Professional & scientific | 2026 |
| Brightedge Project Management Ltd. | Professional & scientific | 2006 |
| Brighter Consultancy Group Limited | Financial services | 2020 |
| Brighter Consultancy Limited | Professional & scientific | 2018 |
| Brightermortgagesuk Ltd | Financial services | 2024 |
| Brightform Sales L.P. | | 2011 |
| Brighthall L.P. | | 2016 |
| Brighthill Consulting Limited | Professional & scientific | 2017 |
| Brightland Design LP | | 2011 |
| Brightlet Homes Ltd | Real estate | 2025 |
| Brighton Commerce L.P. | | 2012 |
| Brightpoint Properties Ltd | Real estate | 2021 |
| Brightside Investments L.P. | | 2012 |
| Brightstack Creative Limited | Information & communication | 2025 |
| Brightstep Limited | Construction | 1988 |
| Brightstone Holdings Limited | Real estate | 2021 |
| Brighttex Group LP | | 2011 |
| Brightwater Holidays Limited | Administrative & support | 1992 |
| Brightwater Transport Limited | Transport & logistics | 1996 |
| Brightwell & Associates | | 1993 |
| Brigita International LP | | 2015 |
| Brigolden Limited | Agriculture & fishing | 2017 |
| Brijesh Property Ltd | Real estate | 2025 |
| Brijwasi Restaurant Limited | Hospitality | 2024 |
| Brilart Impex LP | | 2016 |
| Brill Global LP | | 2015 |
| Brillans LP | | 2016 |
| Brille TA Lumiere LP | | 2023 |
| Brilli Impex Holding LP | | 2019 |
| Brilli Impex LP | | 2016 |
| Brilliance International LP | | 2022 |
| Brilliant Biology Ltd | Professional & scientific | 2019 |
| Brilliant Leaders Ltd | Administrative & support | 2025 |
| Brilliant Moon LP | | 2016 |
| Brilliant Reform LP | | 2017 |
| Brilliant Star SP | | 2000 |
| Brilliant Yellow SP | | 2000 |
| Brilly Ltd | Manufacturing | 2023 |
| Brim Business Resilience International Ltd | Administrative & support | 2019 |
| Brim Enterprise Ltd | Financial services | 2017 |
| Brimfield Consulting LP | | 2017 |
| Brimful Brewing Ltd | Manufacturing | 2025 |
| Brindley Associates Limited | Professional & scientific | 2005 |
| Brindu Consulting LP | | 2020 |
| Brine and Dandy Limited | Hospitality | 2019 |
| Brinel Ltd | Extraterritorial | 2010 |
| Brinelora Studio Limited | Manufacturing | 2026 |
| Brink Literacy Project | Information & communication | 2019 |
| Brinket Ltd | Information & communication | 2025 |
| Brinpak Universal LP | | 2012 |
| Brintech Management LP | | 2016 |
| Brio Retirement Living (Chapelton) Limited | Construction | 2017 |
| Brioche Coffee Limited | Hospitality | 2026 |
| Brisbane Observatory Trust | Arts & recreation | 2011 |
| Briskblue Ventures GP LLP | | 2024 |
| Brista Consulting LP | | 2014 |
| Bristol Capital LP | | 2014 |
| Bristol Foil LP | | 2016 |
| Bristol Fort LP | | 2015 |
| Bristol Logistics LP | | 2016 |
| Bristol Reef LP | | 2016 |
| Bristol Taft LP | | 2016 |
| Bristol Trading Inter LP | | 2013 |
| Briswell Ltd | Real estate | 2025 |
| Brit-Indi Bites Ltd | Hospitality | 2024 |
| Britamer Ltd | Wholesale & retail | 2025 |
| Britannia Estate Planners Limited | Professional & scientific | 2022 |
| Britannia Risks Group Limited | Administrative & support | 2015 |
| Britannia Trustees Ltd | Other services | 2025 |
| Britanniabridges Financial Ltd | Extraterritorial | 2026 |
| Britanniaconstruct Ltd | Extraterritorial | 2026 |
| Britannic Goods Limited | Wholesale & retail | 2025 |
| Britcraft Ltd | Wholesale & retail | 2024 |
| Britech Trading LP | | 2016 |
| Britel Scotland GP II Limited | Real estate | 2015 |
| Britel Scotland GP Limited | Real estate | 2009 |
| Britel Scotland II L.P. | | 2018 |
| Britel Scotland L.P. | | 2009 |
| Britel Scotland Partners LLP | | 2015 |
| British Growth Partnership Fund I LP | | 2025 |
| British Linen Leasing (London) Limited | Financial services | 1986 |
| British Linen Leasing Limited | Professional & scientific | 1971 |
| British Linen Shipping Limited | Professional & scientific | 1978 |
| British Society for Children's Orthopaedic Surgery | Other services | 2013 |
| Britmarco Ltd | Wholesale & retail | 2025 |
| Brito International LP | | 2016 |
| Britroad Logistics L.P. | | 2014 |
| Brits Resources LP | | 2016 |
| Brits Ventures LP | | 2015 |
| Britsense Limited | Wholesale & retail | 2013 |
| Britsoul Petrol LP | | 2016 |
| Brittac International Ltd | Real estate | 2015 |
| Britvic Property Partnership | | 2017 |
| Britvic Scottish Limited Partnership | | 2011 |
| Britx Limited | Arts & recreation | 2018 |
| Britx Sports Limited | Arts & recreation | 2018 |
| Britz Japan Ltd | Wholesale & retail | 2026 |
| Britzmart Limited | Wholesale & retail | 2025 |
| Brivastra Sales LP | | 2013 |
| Brixton Business LP | | 2015 |