| Bluemeadow Ltd | Professional & scientific | 2025 |
| Bluemirror Property Ltd | Real estate | 2023 |
| Bluepeak Commercial Finance Limited | Financial services | 2024 |
| Bluepeak Real Estates Limited | Real estate | 2025 |
| Bluepeak Trading Ltd | Wholesale & retail | 2025 |
| Blueridge Installations Limited | Construction | 2014 |
| Bluerock Haulage Ltd | Transport & logistics | 2025 |
| BLUEROCK2 Limited | Wholesale & retail | 2025 |
| Bluespark WM Ltd | Construction | 2024 |
| Bluestone Homes Ltd | Real estate | 2008 |
| Bluestone Properties (SW) Ltd | Real estate | 2011 |
| Blueswamp Ltd | Administrative & support | 2018 |
| Bluewave Global Ltd | Wholesale & retail | 2026 |
| Bluewings Property Limited | Real estate | 2010 |
| Blumoon Media Limited | Wholesale & retail | 2015 |
| Blush Wellness Ltd | Wholesale & retail | 2026 |
| Blushing Beauty Wolves Ltd | Other services | 2025 |
| Bluu Limited | Wholesale & retail | 2023 |
| Bluxure Ltd | Wholesale & retail | 2025 |
| Blyth Civils Ltd | Construction | 2016 |
| Blyth Group Holdings Limited | Financial services | 2015 |
| Blythe Park Stud Limited | Real estate | 1999 |
| BM Automotive Solutions Ltd | Wholesale & retail | 2011 |
| BM Baked Products Ltd | Wholesale & retail | 2026 |
| BM Treats Ltd | Wholesale & retail | 2015 |
| BM Wholesaler Ltd | Wholesale & retail | 2019 |
| BMA Courier Services Ltd | Transport & logistics | 2024 |
| BME Travel Limited | Transport & logistics | 2023 |
| BME United Limited | Public administration | 2005 |
| BMG A2B Transport Ltd | Transport & logistics | 2025 |
| BMG Carriers Ltd | Transport & logistics | 2026 |
| BMG Fleet Solutions Ltd | Administrative & support | 2026 |
| BMG Housing Ltd | Real estate | 2023 |
| BMO Environment + Community Friend CIC | Professional & scientific | 2025 |
| BMO Group Ltd | Professional & scientific | 2026 |
| Bmpro UK Ltd | Wholesale & retail | 2023 |
| BMT Verse Ltd | Wholesale & retail | 2026 |
| BN Building Works Ltd | Construction | 2025 |
| BNB Enterprises Limited | Construction | 2021 |
| Bnca Birmingham Limited | Other services | 2017 |
| Bndh Consulting Ltd | Professional & scientific | 2022 |
| Bnihn Ltd | Other services | 2022 |
| BNS Digital Marketing Services Ltd | Professional & scientific | 2021 |
| BO Jangles 23 Limited | Transport & logistics | 2026 |
| Bo&Co Enterprises Ltd | Information & communication | 2015 |
| Boactive Limited | Wholesale & retail | 2002 |
| Boadu Care Limited | Public administration | 2018 |
| Boards UP Ltd | Administrative & support | 2025 |
| Boateng Travel Ltd | Transport & logistics | 2020 |
| Boaz Moss Wine Limited | Wholesale & retail | 2025 |
| BOB Waller Consultancy Limited | Professional & scientific | 2000 |
| Bobby Transport Ltd | Transport & logistics | 2009 |
| Bobbys Boots Ltd | Wholesale & retail | 2025 |
| Bobbys Choice Limited | Manufacturing | 2022 |
| BOD Digital Ltd | Information & communication | 2022 |
| Bode Masats (UK) Limited | Extraterritorial | 2003 |
| Body Car SG Ltd | Wholesale & retail | 2025 |
| Body Cover Ltd | Manufacturing | 2019 |
| Bodyshop Dynamics Limited | Wholesale & retail | 2019 |
| Bodyveda Pro Ltd | Professional & scientific | 2025 |
| Bogdan Gabriel Rada Limited | Administrative & support | 2019 |
| Bohemian Wolverhampton Limited | Hospitality | 2025 |
| BOHEMIAN319 Limited | Real estate | 2024 |
| Bois Lane Associates Limited | Professional & scientific | 2026 |
| Bolamilekan Global Trading Ltd | Wholesale & retail | 2026 |
| Bole Machinery Ltd | Other services | 2017 |
| Bolelea Limited | Professional & scientific | 1973 |
| Bollyb Homes Limited | Real estate | 2024 |
| Bolting Direct Holdings Ltd | Professional & scientific | 2021 |
| Bolting Direct Limited | Manufacturing | 2012 |
| Boma Residence Limited | Wholesale & retail | 2022 |
| Bombay BOI Limited | Hospitality | 2026 |
| Bombay Brew Ltd | Wholesale & retail | 2026 |
| BON Air Production Ltd | Manufacturing | 2026 |
| BON Cafe and Bakery Ltd | Hospitality | 2020 |
| BON Property Limited | Real estate | 1998 |
| Bond Fire and Security Ltd | Administrative & support | 2025 |
| Bond UK Investments Ltd. | Hospitality | 2012 |
| Bonds Hoists Limited | Manufacturing | 2011 |
| Boningale Developments Limited | Construction | 2024 |
| Boningale Dining Limited | Hospitality | 2022 |
| Boningale Group Limited | Financial services | 2024 |
| Boningale Holdings Limited | Professional & scientific | 2025 |
| Boningale Homes Limited | Construction | 2012 |
| Bonita Candles Ltd | Wholesale & retail | 2021 |
| Bonn Services Limited | Wholesale & retail | 2022 |
| Bonningford Ltd | Manufacturing | 2024 |
| Bonuzi Nails Limited | Wholesale & retail | 2020 |
| Bookitz Limited | Information & communication | 2026 |
| Bookmyvacay UK Limited | Administrative & support | 2025 |
| Books R US Limited | Wholesale & retail | 2024 |
| Boom Cleaning and Gardening Ltd | Administrative & support | 2024 |
| Boomsticks Limited | Other services | 2012 |
| Booshtox Limited | Health & social care | 2017 |
| Boost Solutions Ltd | Wholesale & retail | 2026 |
| Boosted Backlinks Limited | Information & communication | 2025 |
| Boot Camp Fitness Limited | Education | 2009 |
| Boozebag Ltd | Wholesale & retail | 2025 |
| Boplan UK Limited | Wholesale & retail | 2016 |
| Borg Property Group Limited | Real estate | 2025 |