| Beckett Commercial Solutions Ltd | Manufacturing | 2024 |
| Beckett Thermal Solutions Ltd. | Manufacturing | 1985 |
| BED Shop (Alfreton) Limited | Wholesale & retail | 1987 |
| Beeby-England Limited | Professional & scientific | 2006 |
| Being Your Own Boss Limited | Other services | 2012 |
| Bella Developments Ltd | Construction | 2018 |
| Bells Mechanical Services Ltd | Construction | 2025 |
| Belper Carpet & Flooring Limited | Wholesale & retail | 2003 |
| Beneficial Bookkeeping Ltd | Professional & scientific | 2025 |
| Berry Engineering Solutions Ltd | Manufacturing | 2026 |
| Bespoke Bindery Ltd | Manufacturing | 2025 |
| Better Metal Stores Limited | Manufacturing | 2000 |
| Betts Bins Ltd | Other services | 2021 |
| Bezt Electrical Contracts and Services Limited | Construction | 2022 |
| Billet World Engineering Ltd | Manufacturing | 2021 |
| Billet World Ltd | Manufacturing | 2016 |
| Bing Fitness Ltd | Arts & recreation | 2022 |
| Birchwing Properties Ltd | Real estate | 2024 |
| Birchwood Boarding Kennels and Cattery Limited | Other services | 2011 |
| Birchwood Cladding Systems Limited | Construction | 2002 |
| BKJ Construction Limited | Professional & scientific | 2007 |
| Black Sheep Joinery Ltd | Construction | 2024 |
| Blackwell MOT & Tyre Centre Limited | Wholesale & retail | 2017 |
| Blade Corporate Management Limited | Information & communication | 2012 |
| Blasting Services Limited | Mining & quarrying | 2000 |
| Blazed Distro Ltd | Manufacturing | 2016 |
| BLE Consulting Ltd | Professional & scientific | 2022 |
| Blenheim and Blue Ltd | Other services | 2015 |
| Bleoju Transport Ltd | Transport & logistics | 2018 |
| Blossom & BOW Events Ltd | Hospitality | 2025 |
| Blue Devil Holdings Ltd | Wholesale & retail | 2023 |
| Bluebell Industries Limited | Manufacturing | 1997 |
| Bluebell Realisations One Limited | Manufacturing | 1973 |
| Blurry Days C.I.C. | Information & communication | 2025 |
| BM Surveys Ltd | Professional & scientific | 2026 |
| BMB Mechanical Ltd | Construction | 2019 |
| Bodhi Technical Limited | Professional & scientific | 2021 |
| Body Bliss Ltd | Other services | 2023 |
| Bolton DS Ltd | Professional & scientific | 2022 |
| Bombshell (Nottingham) Ltd | Professional & scientific | 2022 |
| Booboo Retail Trading FRANCHISE3 Ltd | Hospitality | 2024 |
| Boom Entertainment Managment Limited | Information & communication | 2019 |
| Boom Healthcare Services Limited | Health & social care | 2022 |
| Boothen Limited | Transport & logistics | 2016 |
| Boothlee Ltd | Agriculture & fishing | 2016 |
| Booths Rainbow Boarding LLP | | 2025 |
| Boots & Brambles Getaways Ltd | Hospitality | 2026 |
| Bottled UP Blokes C.I.C. | Other services | 2022 |
| Bowmor Properties Ltd | Construction | 2024 |
| Bracewell Associates Limited | Professional & scientific | 2017 |
| Brackenfield Hospitality Ltd | Hospitality | 2020 |
| Bramley Commercial Consulting Ltd | Professional & scientific | 2017 |
| Bramley PUB Co. Ltd | Hospitality | 2025 |
| Brand Storm Limited | Manufacturing | 2014 |
| Bread & Lard Island Ltd | Hospitality | 2024 |
| Brendeck Limited | Manufacturing | 1981 |
| Brevie Plumbing and Heating Limited | Wholesale & retail | 2015 |
| Bridge Thermoplastics Limited | Manufacturing | 1986 |
| Bridgeshire Group Limited | Financial services | 2026 |
| Bridgeshire Holdings Limited | Manufacturing | 2019 |
| Brig-Ayd (Holdings) Ltd | Financial services | 2017 |
| Brig-Ayd Controls Limited | Manufacturing | 2004 |
| Briley Ltd | Professional & scientific | 2006 |
| Britannia Refractory Products Limited | Manufacturing | 2017 |
| Broadmeadows 1955 Limited | Extraterritorial | 2014 |
| Broadoaks Logs and Services Limited | Administrative & support | 2020 |
| Broderia Ltd | Wholesale & retail | 2024 |
| Brook Working Dogs Limited | Other services | 2017 |
| Brooks Supplies Ltd | Wholesale & retail | 2025 |
| Broom Close Developments Limited | Construction | 2017 |
| Broom Close Joinery Limited | Construction | 2022 |
| Brothers Keeper Ltd | Information & communication | 2019 |
| Brsa Solutions Ltd | Wholesale & retail | 2023 |
| Brummie JOE Media Ltd | Professional & scientific | 2019 |
| Builders Supply Company (Leabrooks) Limited | Transport & logistics | 1959 |
| Bulldog Property Services Ltd | Construction | 2019 |
| Burgin & Mitchell Limited | Construction | 2021 |
| Butterfield Properties Limited | Real estate | 1997 |
| Buxton Developments (the Branksome) Ltd | Construction | 2024 |
| Bymilliemay Ltd. | Other services | 2024 |
| Byron Mechanical Limited | Wholesale & retail | 2017 |
| Bywater & Parker PH Ltd | Hospitality | 2023 |
| C & S Homecare Ltd | Health & social care | 2008 |
| C Cassidy & Sons Limited | Wholesale & retail | 2005 |
| C J Fullwood Limited | Construction | 2003 |
| C&H Soles Ltd | Wholesale & retail | 2025 |
| C.J. Rhodes Investments Limited | Financial services | 2024 |
| C4 Electrical Solutions Ltd | Construction | 2023 |
| Cabourns Carpentry Ltd | Manufacturing | 2020 |
| Cabourns Ltd | Real estate | 2023 |
| Cameofy.Com Limited | Information & communication | 2013 |
| Campbell Street Brewing & Wholesale Ltd | Hospitality | 2023 |
| Canopy Commerce Ltd | Professional & scientific | 2023 |
| Canwin Gaming Group Ltd | Information & communication | 2017 |
| Capilla Ceramics Limited | Construction | 2016 |
| Capital Furniture Components Limited | Agriculture & fishing | 2023 |
| Capital Hardwood & Components Limited | Agriculture & fishing | 2013 |
| Capture Photography Schools Limited | Professional & scientific | 2016 |
| Caralux Limited | Professional & scientific | 1992 |
| Caramelised Limited | Hospitality | 2011 |