| Blachford UK Ltd | Manufacturing | 2009 |
| Black Achievers Network CIC | Education | 2023 |
| Black Bull Chesterfield Limited | Hospitality | 2018 |
| Black Cat Bars (Wigan) Ltd | Hospitality | 2012 |
| Black Diamond Leisure Limited | Wholesale & retail | 2016 |
| Black Diamond Outdoor Living Ltd | Wholesale & retail | 2022 |
| Black Horse Healthcare Limited | Agriculture & fishing | 2020 |
| Black Opal Home Solutions Ltd | Construction | 2022 |
| Black Queer Women C.I.C. | Other services | 2023 |
| Blackbird Group Ltd | Real estate | 2018 |
| Blackburn Developments Ltd | Construction | 2018 |
| Blackline 4X4 Limited | Wholesale & retail | 2014 |
| Blacksmith Lane Car Sales Ltd | Wholesale & retail | 2003 |
| Blackthorn Scientific Limited | Professional & scientific | 2022 |
| Blackwell H Realty Ltd | Real estate | 2026 |
| Bladecart Ltd | Wholesale & retail | 2025 |
| Bladon Consultancy Limited | Professional & scientific | 2004 |
| Blake and Sons Limited | Manufacturing | 2018 |
| Blanc Retail Ltd | Wholesale & retail | 2009 |
| Bland Warburton Consulting Limited | Professional & scientific | 2014 |
| Blank Golf Ltd | Wholesale & retail | 2025 |
| Blaq Cat Grayshott Ltd | Information & communication | 2026 |
| Blazes (South Yorkshire) Limited | Wholesale & retail | 2007 |
| Bleackley Holdings Limited | Financial services | 2024 |
| Blessed Catch Limited | Hospitality | 2025 |
| Blh-Medical Ltd | Health & social care | 2022 |
| Blindshut Ltd | Construction | 2024 |
| Blippio Limited | Administrative & support | 2024 |
| Bliss Cocktail Bar and Grill Ltd | Hospitality | 2025 |
| Blissfully Organic Ltd | Manufacturing | 2024 |
| Block Property Solutions Limited | Real estate | 2016 |
| Block Waste Management Limited | Water & waste | 2021 |
| Blockstart Marketing Ltd | Professional & scientific | 2025 |
| Blood Brothers Holdings Ltd | Financial services | 2025 |
| Bloom Housing Property Limited | Real estate | 2020 |
| Bloom Properties Derbyshire Ltd | Real estate | 2008 |
| Blossoms Lettings Ltd | Real estate | 2026 |
| Bluberrie Digital Limited | Information & communication | 2011 |
| Blue Brick Property Ltd | Real estate | 2021 |
| Blue Cloud Accounting Solutions Limited | Professional & scientific | 2001 |
| Blue Diamond Hygiene Supplies Limited | Wholesale & retail | 2011 |
| Blue GUM Healthcare Limited | Health & social care | 2023 |
| Blue Mountain Activities Limited | Arts & recreation | 2009 |
| Blue Print Orthotics Limited | Other services | 2010 |
| Blue Sky Services (East Midlands) Limited | Public administration | 2019 |
| Blue Slate Media Limited | Professional & scientific | 2017 |
| Bluebell Event Services Limited | Hospitality | 2023 |
| Bluebell Hospitality Limited | Hospitality | 2018 |
| Bluebell Hotel Limited | Hospitality | 2023 |
| Bluebell Resourcing Limited | Administrative & support | 2018 |
| Bluebird Design Ltd | Professional & scientific | 2019 |
| Bluebird Print Ltd | Manufacturing | 2019 |
| Bluefan Group Ltd | Administrative & support | 2017 |
| Blueflame Holdings Limited | Financial services | 2023 |
| Bluegrid Software Limited | Information & communication | 2025 |
| Blueqs Ltd | Professional & scientific | 2024 |
| Bluerose Systems Ltd | Information & communication | 2008 |
| Blueshield Limited | Health & social care | 2023 |
| Bluestar-Uk.Com Limited | Information & communication | 2009 |
| Bluewater Commercial Finance Limited | Professional & scientific | 2024 |
| BM Wealth Management Limited | Financial services | 2009 |
| BMC Mowers Limited | Extraterritorial | 2013 |
| BMG Project Management Ltd | Professional & scientific | 2023 |
| BNC Studio Ltd | Professional & scientific | 2025 |
| BNN Estates Ltd | Information & communication | 2024 |
| BOA Heating Ltd | Construction | 2017 |
| Boam's Industrial Transport Training Services Limited | Education | 2003 |
| Board & Bean Ltd | Hospitality | 2024 |
| Boardman Facilities and Consultancy Limited | Real estate | 2025 |
| Boba Shack Limited | Hospitality | 2021 |
| Boca Bars Limited | Hospitality | 2020 |
| Bodhi Group Limited | Health & social care | 2025 |
| Body Pure Ltd | Manufacturing | 2017 |
| Bodyline Photography Ltd | Professional & scientific | 2018 |
| Bodymade to Order Ltd | Arts & recreation | 2015 |
| Boedaisy Nurseries Group Limited | Education | 2025 |
| Boiler Shop Holdings Limited | Financial services | 2025 |
| Bolsover Convenience Store Limited | Wholesale & retail | 2024 |
| Bolsover Designs Ltd | Manufacturing | 2017 |
| Bolsover Mini Market Ltd | Wholesale & retail | 2026 |
| Bolsover Plant Hire Limited | | 1984 |
| Bolsover Wellness CIC | Health & social care | 2024 |
| Bolsover Woodlands Enterprise Ltd | Other services | 2007 |
| Bolsovertaxis Limited | Transport & logistics | 2025 |
| Bolsterstone (Chesterfield) LLP | | 2004 |
| Bolsterstone (Number Nine) Limited | Real estate | 1999 |
| Bolsterstone Group Limited | Construction | 1994 |
| Bolsterstone Holdings Limited | Financial services | 2017 |
| Bolsterstone Investments Limited | Real estate | 2023 |
| Bonbusk Development Ltd | Construction | 2023 |
| Bond P&H Ltd | Construction | 2025 |
| Bonds Investment Properties Ltd | Real estate | 2024 |
| Bonnie Coach Repairs Ltd | Professional & scientific | 2025 |
| Booker Turner Consulting Ltd | Administrative & support | 2018 |
| Bookstage Holdings Limited | Financial services | 2016 |
| Bookstage Limited | Hospitality | 1985 |
| Boosttown UK Ltd | Wholesale & retail | 2024 |
| Booth and Ferguson Holdings Ltd | Households | 2019 |
| Booth's Yard Limited | Real estate | 2026 |
| Boothferry Productions Limited | Information & communication | 2008 |