| B C BEN House Limited | Real estate | 2025 |
| B C Capital House Limited | Real estate | 2025 |
| B Hartley Property Services Limited | Real estate | 2019 |
| B M Private Ltd | Wholesale & retail | 2026 |
| B Queen Nails Ltd | Other services | 2018 |
| B Shaw Electrical Ltd | Construction | 2026 |
| B&A Business Service Ltd | Construction | 2024 |
| B&B Plumbing and Heating Services Ltd | Construction | 2022 |
| B-B Self Storage & Compound Ltd | Real estate | 2021 |
| B.J. Industries Limited | Wholesale & retail | 1982 |
| Baby Panda Takeaway Limited | Hospitality | 2026 |
| Baddiley Farms Limited | Agriculture & fishing | 1966 |
| Bailey Property and Management Services Ltd | Households | 2023 |
| Balaban Distribution Ltd | Transport & logistics | 2026 |
| Balkwell Ltd. | Professional & scientific | 1996 |
| Ball Park (UK) Ltd | Hospitality | 2006 |
| Ballantyne and Bailey Group Limited | Administrative & support | 2023 |
| Barker and Rouse Limited | Hospitality | 2024 |
| Barks Wine Shop Limited | Wholesale & retail | 2025 |
| Barnes Decorators Ltd | Construction | 2013 |
| Barnet and Stubble Ltd | Agriculture & fishing | 2025 |
| Barrowby Court Management Company Limited | Real estate | 2019 |
| Barry Godley Plastering Limited | Construction | 2022 |
| Bartrop & Dilks Lettings Ltd | Real estate | 2011 |
| Bartrop and Dilks Property Services Limited | Real estate | 2007 |
| Bassetlaw Citizens Advice Bureau | Information & communication | 2007 |
| Bassetlaw Cleaning Services Limited | Administrative & support | 2023 |
| Bassetlaw Community and Voluntary Service | Other services | 2010 |
| Bassetlaw Dental Prosthetics Limited | Manufacturing | 2015 |
| Bassetlaw Primary Behaviour Partnership | Professional & scientific | 2016 |
| Bath Trading Ltd | Wholesale & retail | 2024 |
| Battalion Beers Ltd | Wholesale & retail | 2025 |
| Batters Limited | Transport & logistics | 2012 |
| Baumann Services Limited | Wholesale & retail | 2026 |
| Bawtry One Ltd | Construction | 2019 |
| Bawtry Two Ltd | Construction | 2019 |
| Bayson Claim and Building Solutions Ltd | Other services | 2025 |
| BB Leeds Ltd | Hospitality | 2026 |
| BB24 Ltd | Financial services | 2024 |
| Bear Workwear Limited | Wholesale & retail | 2025 |
| Bearing and Transmission Solutions Ltd | Manufacturing | 2018 |
| Beaumont Smith Homes Ltd | Construction | 2021 |
| Beautbyjess Ltd | Other services | 2026 |
| Beautiful Bouquets Limited | Wholesale & retail | 2016 |
| Beautiful Lola Ltd | Construction | 2020 |
| Beauty by Jessica Ltd | Other services | 2026 |
| Becca Holdings Limited | Real estate | 1989 |
| Beckett Services Limited | Wholesale & retail | 2021 |
| Beech House Carehome Worksop Limited | Health & social care | 2011 |
| Belgravia (JEM) Limited | Health & social care | 2008 |
| Belgravia Two Ltd | Financial services | 2024 |
| Belmont Railway Limited | Agriculture & fishing | 2024 |
| Belrik Property Ltd | Real estate | 2022 |
| BEN Capital Limited | Financial services | 2024 |
| Benchmark Architecture Limited | Professional & scientific | 2020 |
| Benchmark Group Limited | Construction | 2022 |
| Benchmark Kitchens Ltd | Wholesale & retail | 2024 |
| Benchmark NPD Ltd | Construction | 2023 |
| Benchmark SMW Logistics Limited | Transport & logistics | 2024 |
| Benchmark Windows and Doors Limited | Manufacturing | 2024 |
| Bentley Engineering Services Limited | Professional & scientific | 2025 |
| Berry Grounds & Gardens Ltd | Administrative & support | 2014 |
| Berrystorth Close Maintenance Ltd | Real estate | 2024 |
| Bersahill Limited | Construction | 2017 |
| Bespoke Fire & Security Solutions Ltd | Public administration | 2018 |
| Bestworx Ltd | Administrative & support | 2016 |
| Better Pick Ltd | Wholesale & retail | 2024 |
| Better Transport Solutions Ltd | Transport & logistics | 2025 |
| BGR Contractors Ltd | Construction | 2022 |
| BH Engineering Services Ltd | Professional & scientific | 2019 |
| BH Wright Property Developments Limited | Real estate | 2024 |
| Bhem Holiday Lets Limited | Real estate | 2020 |
| Bhem Investments Limited | Real estate | 2020 |
| Big M Transport Limited | Transport & logistics | 2017 |
| Biggin Insights Limited | Information & communication | 2024 |
| Bilanz Services Ltd | Extraterritorial | 2025 |
| Birchwells Spas Limited | Manufacturing | 2025 |
| Bistro Budynia Ltd | Hospitality | 2026 |
| Bistro U Budynia CIC | Hospitality | 2025 |
| BIT Northern Ltd | Information & communication | 2017 |
| Bitage Limited | Administrative & support | 1988 |
| Bj's Burger Shack Ltd | Hospitality | 2025 |
| BJB Tiling Limited | Construction | 2009 |
| BK M Generations | Financial services | 2026 |
| BK O Generations | Financial services | 2026 |
| BKB Building Ltd | Construction | 2025 |
| Blacksmith Mews Gateford Limited | Real estate | 2022 |
| Blagg Plant Hire (Worksop) Limited | Construction | 1990 |
| Blank & Dolby Community Interest Company | Wholesale & retail | 2016 |
| Blat Properties Ltd | Real estate | 2023 |
| Blemings Landscapes and Groundworks Ltd | Administrative & support | 2023 |
| Blmk Entrprise Limited | Wholesale & retail | 2025 |
| Bloom Hair Studio Ltd | Other services | 2025 |
| Bloomfields Holdings Limited | Extraterritorial | 2017 |
| Bloomfields Horse Boxes Limited | Manufacturing | 2015 |
| Bloomiful Gifts Limited | Wholesale & retail | 2025 |
| Blue Echo Design Ltd | Information & communication | 2013 |
| Blue Foxes Consultancy Ltd | Professional & scientific | 2023 |
| Bluemac Mortgages Ltd | Financial services | 2022 |
| Blueprint Breaks Limited | Administrative & support | 2026 |