| Brackenfield Estates Limited | Real estate | 2022 |
| Brackenfield Projects Limited | Construction | 2023 |
| Braddox Developments Limited | Construction | 2019 |
| Bradford Property Service’S Ltd | Construction | 2020 |
| Bradshaw Technical Services Limited | Information & communication | 2008 |
| Bramble Cottage Properties Limited | Real estate | 2017 |
| Bramley & White Limited | Wholesale & retail | 2017 |
| Bramwell Holdings Limited | Administrative & support | 2015 |
| Brandesburton Ltd | Administrative & support | 2022 |
| Brandon Logistics Ltd | Transport & logistics | 2019 |
| Bransdale Heights Management Limited | Real estate | 2024 |
| Brar & Brar Limited | Real estate | 2021 |
| Bray's Pipelines Limited | Construction | 2006 |
| Braza Ltd | Wholesale & retail | 2026 |
| Brean Food Limited | Manufacturing | 2016 |
| Breeann Kyra Ltd | Wholesale & retail | 2025 |
| Brenda Jane Seal Limited | Professional & scientific | 2025 |
| Brew & Brunch Ltd | Hospitality | 2023 |
| Bricks+Brew Ltd | Hospitality | 2025 |
| Bridgebank Group Limited | Financial services | 2022 |
| Bridgebank Holdings Limited | Administrative & support | 2016 |
| Bridgebank Limited | Construction | 1986 |
| Bridgebank Plant Limited | Administrative & support | 2019 |
| Bridgegate Business Centre Ltd | Real estate | 2018 |
| Bridges Planning Ltd | Professional & scientific | 2025 |
| Bridleways Guest House Limited | Hospitality | 2017 |
| Brigg Property and Investment Limited | Real estate | 1971 |
| Bright Futures Notts Ltd | Financial services | 2023 |
| Bright Sparks Private Day Nursery Limited | Health & social care | 2016 |
| Bright Star Immigration Limited | Professional & scientific | 2023 |
| Bright Star Travel Limited | Transport & logistics | 2025 |
| Brighter Mansfield Ltd | Hospitality | 2010 |
| Brightspot Cleaning Services Ltd | Administrative & support | 2026 |
| Brightsvail Estate Ltd | Real estate | 2025 |
| Brimbles of Mansfield Limited | Agriculture & fishing | 2004 |
| Brimco (Notts) Limited | Agriculture & fishing | 2018 |
| Brimley Limited | Wholesale & retail | 2025 |
| Brindis Ltd | Professional & scientific | 2021 |
| Bring Joy Ltd | Information & communication | 2009 |
| Britalia Italian Ltd | Hospitality | 2024 |
| Britannia Wealth and Compliance Limited | Professional & scientific | 2025 |
| Brnt Limited | Wholesale & retail | 2024 |
| Broad Bar Limited | Hospitality | 2026 |
| Broadbent Electrical Ltd | Construction | 2023 |
| Broadstone Estates Ltd | Households | 2023 |
| Broadway Mobility Vehicles Ltd | Wholesale & retail | 2025 |
| Broadwood Landscaping Services Limited | Administrative & support | 2019 |
| Brocklehurst Power Solutions Ltd | Financial services | 2013 |
| Brocklehurst Property Ltd | Real estate | 2022 |
| Brodericks Services Ltd | Hospitality | 2024 |
| Bronzing Paradise Ltd | Other services | 2024 |
| Brooklands Nurseries Limited | Agriculture & fishing | 2003 |
| Brooks Models Ltd | Other services | 2020 |
| Broomhill Development Limited | Construction | 2017 |
| Brown Avenue Stores Ltd | Wholesale & retail | 2022 |
| Brown Rice Sushi Company Ltd | Hospitality | 2024 |
| Broxton's Civil Site Services Ltd | Construction | 2024 |
| Brunchy Ltd | Wholesale & retail | 2025 |
| Brushworks Construction Ltd | Construction | 2024 |
| BS UK Services (Asafo Market) Limited | Wholesale & retail | 2020 |
| BSB Cars Limited | Wholesale & retail | 2021 |
| Bshmansfield CIC | Real estate | 2023 |
| BSL International Limited | Wholesale & retail | 1993 |
| BTS Car Sales Limited | Wholesale & retail | 2011 |
| Bubble Creations Limited | Arts & recreation | 2016 |
| Bubbles Showers and Bathrooms Ltd | Wholesale & retail | 2009 |
| Buckland Rail Limited | Manufacturing | 2008 |
| Budget Bangers Ltd | Wholesale & retail | 2014 |
| Budget Bodyshop Ltd | Wholesale & retail | 2025 |
| Budget MB Bodyshop Ltd | Wholesale & retail | 2025 |
| Budget Mobile Bodyshop Ltd | Wholesale & retail | 2020 |
| Buffet Fever Limited | Hospitality | 2025 |
| Bugiganga Ltd | Wholesale & retail | 2022 |
| Build by Croft Limited | Construction | 2024 |
| Build to Scale Ltd | Construction | 2024 |
| Buildcare Ltd | Real estate | 2010 |
| Building Lives Around Shirebrook Town CIC | Arts & recreation | 2020 |
| Buildworks (Mansfield) Limited | Construction | 2011 |
| Builtwell Construction Ltd | Construction | 2022 |
| Bukola Crown Ltd | Wholesale & retail | 2024 |
| Buku Platform Ltd | Information & communication | 2022 |
| Bull Farm Barber Limited | Other services | 2025 |
| Bullseye Properties Ltd | Real estate | 2023 |
| Bumpkeys Limited | Manufacturing | 2024 |
| Burbage Consulting Ltd | Health & social care | 2012 |
| Burger Valley Ltd | Hospitality | 2022 |
| Burgess Security Ltd. | Administrative & support | 2018 |
| Burgsta Ltd | Information & communication | 2024 |
| Burning Moon Productions Limited | Information & communication | 2025 |
| Burns-Lindoe Property Services Limited | Real estate | 2022 |
| Burrich Ltd | Construction | 2017 |
| Burton & Sherwood Limited | Wholesale & retail | 1957 |
| Burton Performance Ltd | Wholesale & retail | 2025 |
| Burtsbestbaps Ltd | Hospitality | 2026 |
| Busi Xoli Limited | Health & social care | 2017 |
| Busybird Hosting Ltd | Information & communication | 2017 |
| Butterfly Effex Ltd | Arts & recreation | 2018 |
| Butterfly Screen Print Limited | Manufacturing | 2022 |
| Butterfly Wood Ltd | Public administration | 2025 |
| Buttons Joinery Services Ltd | Construction | 2025 |