| Billy Bob's Franchise Limited | Administrative & support | 2017 |
| Billy Bob's Holdings Limited | Financial services | 2017 |
| Billy-Bob's Parlour Limited | Hospitality | 2011 |
| Bingham Developments Limited | Extraterritorial | 1985 |
| Bizzie Lizzies (Properties) Ltd | Real estate | 2016 |
| Bizzie Lizzies (Restaurants) Limited | Hospitality | 1990 |
| BJK Capital Ltd | Financial services | 2023 |
| BKW Innovations Limited | Manufacturing | 2016 |
| Black ELK Leisure Limited | Manufacturing | 2018 |
| Blackbox Media Ltd | Information & communication | 2019 |
| Blackhall Brooksbank Limited | Manufacturing | 1995 |
| Blackwatch Recruitment Ltd | Administrative & support | 2024 |
| Blade Line (UK) Limited | Transport & logistics | 1983 |
| Blagden Electrical Services Ltd | Construction | 2026 |
| Blow UP Press Limited | Wholesale & retail | 2004 |
| Blue Environmental Limited | Water & waste | 2005 |
| Blue Pebble Solutions Ltd | Financial services | 2011 |
| Blue Sky Cashmere Ltd | Professional & scientific | 2014 |
| Blue Water Holidays Limited | Information & communication | 2000 |
| Blue Water Travel Ltd | Administrative & support | 2020 |
| Bluefly Ltd | Administrative & support | 2019 |
| Blueslug Limited | Other services | 2021 |
| Bmnotts Ltd | Hospitality | 2025 |
| Bold Venture Garage Ltd | Wholesale & retail | 2016 |
| Bollen Properties Ltd | Real estate | 2025 |
| Bolton Abbey Bobcats & Plant Hire Limited | Administrative & support | 2003 |
| Bonnie View Motors Limited | Wholesale & retail | 2020 |
| Boost HR UK Ltd | Administrative & support | 2018 |
| Border Trading (NW) Ltd | Agriculture & fishing | 2024 |
| Bowers Consultants Limited | Professional & scientific | 2000 |
| Bowland Groundworks Ltd | Construction | 2013 |
| Bowman Riley Architects Limited | Professional & scientific | 2003 |
| Bowman Riley Group Limited | Financial services | 2024 |
| BPM Digital Ltd | Information & communication | 2011 |
| Bradley Construction (Yorkshire) Ltd | Construction | 2022 |
| Bradley Hardacre Limited | Hospitality | 1996 |
| Braes Farm Limited | Agriculture & fishing | 1995 |
| Bragr UK Limited | Information & communication | 2025 |
| Bramble Post Ltd | Wholesale & retail | 2025 |
| Branchetti Ltd | Education | 2021 |
| Branded Supply Ltd | Manufacturing | 2019 |
| Brayshaw View Campsite Ltd | Hospitality | 2025 |
| Brear Properties Limited | Real estate | 2018 |
| Breathe Properties Limited | Real estate | 2024 |
| Breeze Creative Print Limited | Administrative & support | 2004 |
| Breeze Product Design Ltd | Professional & scientific | 2007 |
| Brex Properties Ltd | Real estate | 2025 |
| Bridey AC Limited | Manufacturing | 2020 |
| Bridge Home Heating Solutions Ltd | Construction | 2024 |
| Briggs & Duxbury Limited | Other services | 1947 |
| Bright Starts SEN CIC | Education | 2025 |
| Brightbird Coaching and Training Ltd | Professional & scientific | 2022 |
| British Furniture Confederation | Other services | 2006 |
| Brogden Properties Ltd | Real estate | 2021 |
| Bronte & Bronte Limited | Wholesale & retail | 2022 |
| Brooksbank Industries Limited | Manufacturing | 1978 |
| Brookster Ltd | Agriculture & fishing | 2021 |
| Broughton Group Holdings Limited | Extraterritorial | 2002 |
| Broughton Laboratories Limited | Professional & scientific | 2006 |
| Broughton Mews Management Company Limited | Administrative & support | 1992 |
| Broughton Rebalanced LLP | | 2026 |
| Broughton Sanctuary Limited | Professional & scientific | 2026 |
| Broughton Software Limited | Information & communication | 2012 |
| Broughton Stability Services Limited | Extraterritorial | 2010 |
| Broughton Trustees 1 Limited | Extraterritorial | 2017 |
| Broughton Trustees 2 Limited | Extraterritorial | 2017 |
| Broughton Ventures Limited | Financial services | 2010 |
| Brow Well Fisheries Limited | Agriculture & fishing | 1980 |
| Brown BAG Cafe & Eco Shop Ltd | Hospitality | 2023 |
| Brownbagprotein Ltd | Wholesale & retail | 2021 |
| Browns Tree Services Limited | Agriculture & fishing | 2006 |
| Bs&A Satellite E Limited | Financial services | 2024 |
| Bs&A Satellite K Limited | Financial services | 2024 |
| Bs&A Satellite M Limited | Financial services | 2024 |
| Bs&A Satellite P Limited | Financial services | 2024 |
| BSS Crabtree Holdings Ltd | Real estate | 2025 |
| Buckdencamping and Pods Ltd | Hospitality | 2018 |
| Build Back Better Awards Limited | Professional & scientific | 2021 |
| Buildakit Properties Limited | Real estate | 2017 |
| Buitex Sphere Solutions Ltd | Wholesale & retail | 2024 |
| Bulk Air Limited | Information & communication | 2013 |
| Bulloughs Cleaning Services Limited | Administrative & support | 1987 |
| Bumpworks Ltd | Professional & scientific | 2012 |
| Bums on Seats Films Ltd | Information & communication | 2025 |
| Busfield Forestry Ltd | Agriculture & fishing | 2025 |
| Business Analysis Group Limited | Professional & scientific | 2018 |
| C & G Ward Properties Limited | Financial services | 2018 |
| C & S Holdings (Yorkshire) Ltd | Financial services | 2020 |
| C F Rentals Limited | Real estate | 2017 |
| C Holgate Environmental Ltd. | Other services | 2021 |
| C J Smith D. C. Limited | Health & social care | 2003 |
| C Lambert Fibre Solutions Limited | Information & communication | 2020 |
| C S Evans Contractors Ltd | Construction | 2017 |
| C&S Construction (Yorkshire) Ltd | Construction | 2023 |
| C&S Developments (Yorkshire) Ltd | Construction | 2025 |
| C&S Operations (Yorkshire) Ltd | Administrative & support | 2020 |
| C. Smith Ltd | Wholesale & retail | 2018 |
| Cabra Group Ltd | Financial services | 2021 |
| Caffeine Rush Limited | Administrative & support | 2000 |
| Calder Valley Agricultural Services Limited | Extraterritorial | 1988 |