| Bouglon Limited | Real estate | 2014 |
| Boulton's Butchers Limited | Wholesale & retail | 2019 |
| Bound by Blood Ltd | Wholesale & retail | 2025 |
| Bound Tree Medical Europe Ltd | Wholesale & retail | 2014 |
| Bowring Developments Limited | Construction | 2017 |
| Box Blinds Limited | Extraterritorial | 2018 |
| Boxed Blinds Limited | Extraterritorial | 2018 |
| Boxed Knowledge Limited | Administrative & support | 2024 |
| Boxway Group Holdings Limited | Manufacturing | 2021 |
| Boxway Packaging Group Limited | Manufacturing | 2021 |
| Boyd Glover Consulting Ltd | Information & communication | 2012 |
| Boydell Lettings (Sedgley) Limited | Real estate | 2008 |
| Bracken Plant & Equipment Ltd | Wholesale & retail | 2015 |
| Bradmoor Ltd | Transport & logistics | 2020 |
| Brahma Finance (BVI) Limited | | 2023 |
| Brais HCW Ltd | Wholesale & retail | 2023 |
| Branaf Ltd | Other services | 2022 |
| Brandnewn Ltd | Wholesale & retail | 2025 |
| Branson Consulting Limited | Professional & scientific | 2025 |
| Branyx Ltd | Other services | 2020 |
| Bratton Developments Limited | Construction | 2009 |
| Brays Pipelines and Utilities Limited | Construction | 2024 |
| Brazier Builders Limited | Construction | 2024 |
| Brebenels£Services Limited | Construction | 2025 |
| Breeders Seeds Limited | Wholesale & retail | 2010 |
| Brendanas Ltd | Other services | 2019 |
| Bren’S IT Services Limited | Information & communication | 2019 |
| Brest Ltd | Other services | 2019 |
| Brewgenie Ltd | Wholesale & retail | 2012 |
| Brewood Food and Wines Limited | Hospitality | 2006 |
| Brick and Beyond Ltd | Hospitality | 2026 |
| Brick Road Ltd | Information & communication | 2013 |
| Bridge Cheese Ltd | Manufacturing | 2018 |
| Bridge Dental Practice Limited | Health & social care | 2009 |
| Bridge Psychology Services Limited | Health & social care | 2018 |
| Bridge Therapy UK (Hypnotherapy) Ltd | Health & social care | 2022 |
| Bridgnorth Car Clinic Ltd | Wholesale & retail | 2023 |
| Bridgnorth Funeral Services Limited | Extraterritorial | 2012 |
| Bright and Shine the Stove Shop Ltd | Wholesale & retail | 2018 |
| Bright Key Property Management Ltd | Real estate | 2024 |
| Bright Minds Play Area Ltd | Arts & recreation | 2025 |
| Bright Nights Electrical Limited | Construction | 2016 |
| Bright Stars Education & Training Ltd | Education | 2022 |
| Bright Starz Cleaning Ltd | Construction | 2022 |
| Brightbox TCG Ltd | Wholesale & retail | 2025 |
| Brightmarket Retail Ltd | Wholesale & retail | 2026 |
| Brightstar Community Holdings Limited | Financial services | 2024 |
| Brightstar Plus Limited | Health & social care | 2017 |
| Brilliance Care Agency Ltd | Health & social care | 2025 |
| Brimsham Holdings Limited | Financial services | 2022 |
| Brioserve Ltd | Other services | 2023 |
| Brit Classic Automotive Reconditioned Spares Limited | Wholesale & retail | 2016 |
| Brit-Cravings Ltd | Wholesale & retail | 2024 |
| Britannia Vision Ltd | Health & social care | 2021 |
| Britevox Limited | Administrative & support | 2017 |
| British BUS Publishing Limited | Information & communication | 1995 |
| British Holstein Society | Other services | 1980 |
| Britpad (Incontinence Products) Limited | Wholesale & retail | 2023 |
| Britprint.Com Limited | Wholesale & retail | 2000 |
| Brits in Bulgaria Studio Limited | Information & communication | 2023 |
| Britune Services Ltd | Professional & scientific | 2025 |
| Broadband Recycling Limited | Water & waste | 2006 |
| Brobal Enterprises Ltd | Real estate | 2010 |
| Brobotics Ltd | Information & communication | 2021 |
| Brock Bottom Prices Ltd | Wholesale & retail | 2026 |
| Brockton Canine Services Limited | Other services | 2018 |
| Bromleynet Limited | Information & communication | 2012 |
| Bronze Software Labs Ltd | Information & communication | 2010 |
| Brook Cars Company Limited | Wholesale & retail | 2016 |
| Brookside Big Local Community Interest Company | Administrative & support | 2018 |
| Brookteen Kennels Ltd | Other services | 2019 |
| Brookteen Labradors Ltd | Other services | 2020 |
| Broseley & District Funeral Services Limited | Extraterritorial | 2012 |
| Brownshore Management Limited | Professional & scientific | 2018 |
| Bruderer UK Limited | Wholesale & retail | 1968 |
| Brush UP Accounting Ltd | Professional & scientific | 2021 |
| Brushline Ltd | Administrative & support | 2024 |
| Bryght Ltd | Administrative & support | 2015 |
| Bryham Property Ltd | Real estate | 2015 |
| Bryndeli Ltd | Information & communication | 2026 |
| BS Pizza Ltd | Hospitality | 2024 |
| BSA Aviation Ltd | Manufacturing | 2026 |
| BSJ Property Holdings Ltd | Real estate | 2020 |
| Bskd Limited | Real estate | 2024 |
| BSP Ford Limited | Hospitality | 2026 |
| BTI Group Limited | Financial services | 2022 |
| Btme Group Ltd | Wholesale & retail | 2005 |
| Btme Holdings Limited | Financial services | 2021 |
| Btoh Properties Ltd | Real estate | 2025 |
| BTR Industries Limited | Financial services | 1950 |
| Btrac Limited | Manufacturing | 2009 |
| Bubblez Hand Car Wash Ltd | Administrative & support | 2025 |
| Buckle Ltd | Transport & logistics | 2023 |
| Bucks Courier Ltd | Transport & logistics | 2025 |
| Buda Wood Ltd | Construction | 2022 |
| Buddha Bowl Holdings Ltd | Extraterritorial | 2025 |
| Budix Limited | Construction | 2019 |
| Build 55 LLP | | 2015 |
| Build Fifty Five Limited | Construction | 2005 |
| Buildwas Civil ENG Limited | Professional & scientific | 2026 |