| Big Star Entertainments Ltd. | Arts & recreation | 2003 |
| Big Tattoo Meltdown Ltd | Hospitality | 2024 |
| Big Tops Nottingham Limited | Manufacturing | 2022 |
| Big Tops U.K. Limited | Manufacturing | 1994 |
| Big Tribe Limited | Wholesale & retail | 2021 |
| Big Tyres Ltd | Wholesale & retail | 2009 |
| Big Vapes (Nottingham) Limited | Wholesale & retail | 2018 |
| Big Wave Ventures Limited | Hospitality | 2024 |
| Bigday Entertainments Ltd | Arts & recreation | 2025 |
| Biggz Kitchen Ltd | Hospitality | 2023 |
| Bighan Limited | Hospitality | 2019 |
| Bignall Homes Limited | Real estate | 2020 |
| Bigspark Group Limited | Information & communication | 2022 |
| Bigspark Limited | Information & communication | 2019 |
| Biiab Qualifications Limited | Education | 2016 |
| Biigtown Limited | Health & social care | 2019 |
| Bijou Estates Limited | Real estate | 2020 |
| Bijou Fine Jewellery Ltd | Wholesale & retail | 2024 |
| Bike Boss Ltd | Other services | 2025 |
| Bikepacking Wales Ltd | Wholesale & retail | 2023 |
| Bilal Medicos Ltd | Health & social care | 2022 |
| Bilberry Holdings Ltd | Financial services | 2026 |
| Bilberry Tech Ltd | Information & communication | 2022 |
| Bilcon Limited | Professional & scientific | 1985 |
| Bildurn (Properties) Limited | Construction | 1989 |
| Bildurn Estates Limited | Real estate | 2006 |
| Bilingem UK Ltd | Administrative & support | 2020 |
| Billa Haus Ltd | Construction | 2021 |
| Billan Properties Limited | Real estate | 2011 |
| Billansa Waste Ltd | Water & waste | 2020 |
| Billborough Convenience Store Ltd | Wholesale & retail | 2016 |
| Billies Properties Limited | Households | 2025 |
| Billionz Company Limited | Other services | 2025 |
| Billionz Lounge Ltd | Hospitality | 2021 |
| Billson Consulting Ltd | Professional & scientific | 2015 |
| Billson Properties Limited | Real estate | 2018 |
| Billy Amazing Shipping Service Ltd | Wholesale & retail | 2018 |
| Billy Morris Building and Landscaping Ltd | Construction | 2017 |
| Billy Morris Holdings Ltd | Financial services | 2020 |
| Billy Morris Properties Ltd | Real estate | 2020 |
| BIM Architecture Limited | Professional & scientific | 2010 |
| BIM in AM Ltd | Information & communication | 2026 |
| BIM Merchants Ltd | Water & waste | 2021 |
| Bimark Limited | Professional & scientific | 1985 |
| Bimmer Garage Nottingham Ltd | Wholesale & retail | 2022 |
| Bimnah International Limited | Real estate | 2018 |
| BIN Ashfaq Traders Limited | Wholesale & retail | 2024 |
| Bina Menz Estate Planning Ltd | Professional & scientific | 2019 |
| Binary BEE Consulting Ltd | Information & communication | 2019 |
| Binblasterz Ltd | Administrative & support | 2025 |
| Bineti Ltd | Information & communication | 2021 |
| Bing Consulting Ltd | Information & communication | 2013 |
| Bingham Baker Leisure Ltd | Hospitality | 2023 |
| Bingham Brick and Stone Repointing Specialist Ltd | Construction | 2020 |
| Bingham Cabs Limited | Transport & logistics | 2025 |
| Bingham Carbon Solutions Limited | Professional & scientific | 2023 |
| Bingham DRY Cleaners Ltd | Other services | 2025 |
| Bingham Estates Ltd | Real estate | 2015 |
| Bingham Flooring Limited | Construction | 2017 |
| Bingham Gymnastics Ltd | Health & social care | 2022 |
| Bingham Health & Fitness Club Ltd | Health & social care | 2026 |
| Bingham Healthy Minds & Bodies Ltd | Arts & recreation | 2025 |
| Bingham Marketing Limited | Professional & scientific | 2023 |
| Bingham Nails & Beauty Ltd | Other services | 2018 |
| Bingham Rugby Football Club Ltd | Education | 2018 |
| Bingham Tanning Rooms Ltd | Other services | 2025 |
| Bingham Trailer Spares Limited | Wholesale & retail | 2010 |
| Bingham Van Centre Limited | Wholesale & retail | 2025 |
| Binghamjewellers Limited | Wholesale & retail | 2022 |
| Binns Organ Trust | Arts & recreation | 1989 |
| Binstead Designs Limited | Manufacturing | 1995 |
| BIO Dynamic (UK) Limited | Energy | 2013 |
| BIO Dynamic Power Limited | Professional & scientific | 2016 |
| BIO Mineral Balance Limited | Health & social care | 2020 |
| BIO Research Ltd | Wholesale & retail | 2024 |
| BIO19 Limited | Professional & scientific | 2025 |
| Bioactive Vivariums Ltd | Wholesale & retail | 2024 |
| Biobase Nottingham CIC | Real estate | 2026 |
| Biocity Group Limited | Professional & scientific | 2013 |
| Biocity Investments Limited | Financial services | 2009 |
| Biodock Limited | Health & social care | 2020 |
| Bioeden Group Limited | Financial services | 2008 |
| Bioeden Holdings Limited | Wholesale & retail | 2017 |
| Biolead Ltd | Professional & scientific | 2025 |
| Biomatter Consultancy Limited | Professional & scientific | 2024 |
| Biomechanica Limited | Manufacturing | 2024 |
| Biomechanics Ltd | Professional & scientific | 2021 |
| Biomedha Limited | Information & communication | 2015 |
| Biomedical Consulting Limited | Health & social care | 2019 |
| Biondi Bistro Limited | Real estate | 2012 |
| Biondi Properties LLP | | 2024 |
| Bioniqs Ltd | Professional & scientific | 2018 |
| Biopharma Stability Testing Laboratory Limited | Manufacturing | 2012 |
| Biosenex Limited | Professional & scientific | 2014 |
| Biostart Consulting Ltd | Professional & scientific | 2026 |
| Biostone Co. Limited | Administrative & support | 2016 |
| Biosyntria Limited | Wholesale & retail | 2024 |
| Biovarahealth Ltd | Other services | 2025 |
| BIP Logistic Ltd | Transport & logistics | 2020 |
| Bipshayl Associates Limited | Health & social care | 2017 |