| Businessworks Consulting Limited | Information & communication | 2020 |
| Bussage Ltd | Administrative & support | 2022 |
| Buster Investments (Nottingham) Limited | Financial services | 2025 |
| Busy BEE Fencing Limited | Manufacturing | 2004 |
| Busy BEE Workshop Ltd | Manufacturing | 2023 |
| Busy Bodies Childcare Limited | Health & social care | 2022 |
| Busy Busy Cleaning Ltd | Administrative & support | 2024 |
| Busy Getting Better Ltd | Wholesale & retail | 2025 |
| Busy-Bobbins Limited | Other services | 2016 |
| Butik Wiki ( Italian Fashion ) Ltd | Extraterritorial | 2015 |
| Butler and Sons Plastering Limited | Construction | 2025 |
| Butler Couriers Limited | Transport & logistics | 2019 |
| Butler Engineering Ltd | Professional & scientific | 2011 |
| Butler Fasteners Limited | Wholesale & retail | 2010 |
| Butlers Coffee Holdings Ltd | Financial services | 2024 |
| Butlers Ruddington Ltd | Hospitality | 2024 |
| Butop Ltd | Information & communication | 2025 |
| Butt Investment Group Limited | Real estate | 2024 |
| Butt Property Group Limited | Real estate | 2023 |
| Butter Bakery Ltd | Manufacturing | 2025 |
| Butter Strength Ltd | Wholesale & retail | 2026 |
| Buttercups Group Limited | Financial services | 2018 |
| Buttercups Holdings Limited | Financial services | 2023 |
| Buttercups Training Limited | Education | 1995 |
| Butterfly and Blossom Events Company Ltd | Wholesale & retail | 2023 |
| Butterfly Beauty Limited | Other services | 2025 |
| Butterfly Effects (Gallery) Limited | Other services | 2018 |
| Butterfly Fresh Ltd | Wholesale & retail | 2025 |
| Butterfly Group Holdings Limited | Financial services | 2023 |
| Butters Holdings Limited | Real estate | 2008 |
| Butterworth & Martin Ltd | Construction | 2024 |
| Buttress Developments Limited | Real estate | 2018 |
| Buttress Limited | Professional & scientific | 1999 |
| Buttrington Properties Limited | Real estate | 2025 |
| Butty Music Ltd | Arts & recreation | 2024 |
| Buttylicious Limited | Hospitality | 2017 |
| Buxton Homes Limited | Real estate | 2001 |
| Buxton Properties Nottingham Limited | Real estate | 2012 |
| Buxton Training Enterprises Limited | Education | 2008 |
| Buxton V.E. Limited | Other services | 2008 |
| Buy IT for Less Limited | Wholesale & retail | 2023 |
| Buyam Sellam Limited | Wholesale & retail | 2025 |
| Buyandsellnow Ltd | Wholesale & retail | 2026 |
| Buying Butler Ltd | Extraterritorial | 2012 |
| Buyo Ltd | Wholesale & retail | 2023 |
| Buyparts Limited | Wholesale & retail | 2017 |
| Buypromoproducts Limited | Professional & scientific | 2016 |
| BUZ Electrics Ltd Ltd | Manufacturing | 2026 |
| Buzee Food Ltd | Wholesale & retail | 2024 |
| Buzee Groups Ltd | Wholesale & retail | 2015 |
| Buzee Store Ltd | Wholesale & retail | 2020 |
| Buzz Bingo Digital Limited | Arts & recreation | 2020 |
| Buzz Bingo Group Limited | Extraterritorial | 2018 |
| Buzz Entertainment Limited | Professional & scientific | 1964 |
| Buzz Group Limited | Arts & recreation | 1964 |
| Buzz Holdings Limited | Professional & scientific | 2014 |
| Buzz Leisure Limited | Arts & recreation | 1974 |
| Buzz Management LP | | 2022 |
| Buzz Venus Acquisitions Limited | Professional & scientific | 2015 |
| Buzz Venus Group Limited | Professional & scientific | 2015 |
| Buzzard Ltd | Professional & scientific | 2023 |
| Buzzbasket Limited | Wholesale & retail | 2026 |
| Buzzermedia Ltd | Arts & recreation | 2022 |
| Buzziebuy Ltd | Wholesale & retail | 2025 |
| BV Barr Ltd | Administrative & support | 2022 |
| Bvgnotts Ltd | Hospitality | 2023 |
| BVIR79 Ltd | Transport & logistics | 2018 |
| Bvost Limited | Information & communication | 2014 |
| Bvvlad Transport Ltd | Other services | 2018 |
| BW Driveways Limited | Construction | 2023 |
| BW1 Bookkeeping Ltd | Professional & scientific | 2024 |
| BW1 Business Management Consultancy Ltd | Professional & scientific | 2022 |
| BW1 Consultants Ltd | Professional & scientific | 2022 |
| BW1 Enterprise Group Ltd | Professional & scientific | 2012 |
| BW1 Facilities Management Ltd | Real estate | 2021 |
| BW1 HR Management Ltd | Administrative & support | 2022 |
| BW1 Payroll Ltd | Administrative & support | 2025 |
| BWB Consulting Limited | Professional & scientific | 2004 |
| BWB Holdings Limited | Professional & scientific | 2015 |
| BWB Regeneration Limited | Professional & scientific | 2008 |
| BWB Regeneration Trustee Limited | Other services | 2008 |
| BWL Social Care Limited | Wholesale & retail | 2008 |
| Bwshra Limited | Wholesale & retail | 2025 |
| BY Drylining Ltd | Construction | 2016 |
| BY Emily Medical Aesthetics Ltd | Health & social care | 2023 |
| BY Fryer Ltd | Transport & logistics | 2022 |
| BY Malia Ltd | Other services | 2020 |
| BY Marla Ltd | Wholesale & retail | 2024 |
| BY ME and Reena Ltd | Arts & recreation | 2019 |
| BY Sara Christie Ltd | Wholesale & retail | 2025 |
| BY Your Side Support Limited | Health & social care | 2026 |
| BY2LET Limited | Real estate | 2020 |
| Byard Enterprises Ltd | Financial services | 2016 |
| Byard Soft Ltd | Information & communication | 2015 |
| Byard's Boutique Limited | Wholesale & retail | 2024 |
| Bycom Ltd | Information & communication | 2012 |
| Byfield Drive Academy Ltd | Education | 2026 |
| Byfield Environment and Ecology Limited | Professional & scientific | 2018 |
| BYG Systems Limited | Information & communication | 1983 |
| Bygeorgia Ltd | Extraterritorial | 2023 |