| Bradwell & Co Limited | Real estate | 2005 |
| Brainspace Ltd | Professional & scientific | 2025 |
| Braithwaite Contracting & Driveways Ltd | Administrative & support | 2025 |
| Brand Works Signage Ltd | Manufacturing | 2024 |
| Breathe and Bloom Holistics Limited | Health & social care | 2022 |
| Brewmasters Limited | Wholesale & retail | 2020 |
| Brian Yeardley Continental Limited | Transport & logistics | 1979 |
| Brickworks Cafe Ltd | Hospitality | 2026 |
| Bridge House Bond Limited | Construction | 2009 |
| Bridge Pallet & Case Supplies Ltd | Manufacturing | 2026 |
| Bridge Pallet Supplies Limited | Manufacturing | 2012 |
| Bridge Street Apartments (Tadcaster) Ltd | Real estate | 2024 |
| Bridgegate Property Services Ltd | Construction | 2026 |
| Briercliffe Estates Limited | Wholesale & retail | 2005 |
| Briggs Murray Actuarial Ltd | Administrative & support | 2015 |
| Brightlight Invest Ltd | Real estate | 2018 |
| Brilliant Stages Limited | Administrative & support | 2010 |
| Bristock Limited | Professional & scientific | 2014 |
| Britt Broadbent Limited | Real estate | 1976 |
| Broadstar Trading Ltd | Wholesale & retail | 2022 |
| Brody Transport Yorkshire Ltd | Transport & logistics | 2025 |
| Bronco Horse Supplies Ltd | Wholesale & retail | 2024 |
| Bronty Electrical Ltd | Energy | 2021 |
| Brooke Electrical Limited | Construction | 2020 |
| Brooke Property Ltd | Real estate | 2024 |
| Brooklyn House of Beauty Limited | Other services | 2003 |
| Brown & Cadman Properties Ltd | Real estate | 2025 |
| Brown's Coaches (South Kirkby) Limited | Transport & logistics | 1987 |
| Browns Construction Northern Limited | Construction | 2026 |
| Broy Construction Ltd | Construction | 2026 |
| Broy Restaurant Ltd | Hospitality | 2026 |
| Brunch at Myxology Ltd | Hospitality | 2024 |
| Bryony Signs Limited | Manufacturing | 2014 |
| BST Event Solutions Ltd | Construction | 2024 |
| Building Services SPB Ltd | Construction | 2022 |
| Built by Saxon Ltd | Construction | 2024 |
| Bullet Logistics (South Elmsall) Limited | Transport & logistics | 2019 |
| Bunker Property Ltd | Real estate | 2024 |
| Buns&Brew Kinsley Ltd | Hospitality | 2025 |
| Burdons Transport Limited | Transport & logistics | 2010 |
| Burger House Upton Ltd | Hospitality | 2023 |
| Burnetts House Filey Ltd | Real estate | 2025 |
| Burnetts House Ltd | Real estate | 2025 |
| Burton Utilities & Civils Limited | Construction | 2007 |
| Burton-Robinson Ltd | Real estate | 2021 |
| Buscar Lettings Limited | Real estate | 2011 |
| Business Networking Expo's Ltd | Other services | 2025 |
| Business Solutions Car Hire Limited | Administrative & support | 2018 |
| Busy POO Ltd | Professional & scientific | 2016 |
| Butterflies Childrens Wear Limited | Wholesale & retail | 2010 |
| BW Leisure Ltd | Hospitality | 2025 |
| BY Service Ltd | Professional & scientific | 2026 |
| Byfield Heating Ltd. | Construction | 1996 |
| Byrne Fire Safety Ltd | Professional & scientific | 2023 |
| C & D Accountants Ltd | Professional & scientific | 2016 |
| C & LCR Limited | Professional & scientific | 2019 |
| C Davies Property Developments Ltd | Real estate | 2024 |
| C J Antal-Smith Limited | Professional & scientific | 2021 |
| C Scrub Hub Ltd | Administrative & support | 2026 |
| C Taylor Gardening Limited | Administrative & support | 2023 |
| C Taylor Window Cleaning Limited | Administrative & support | 2021 |
| C&A Utilities Ltd | Construction | 2019 |
| C&C Screeders UK Ltd | Construction | 2011 |
| C-Rok Electric Ltd | Professional & scientific | 2015 |
| C.A.R.E. Consultancy Ltd | Professional & scientific | 2012 |
| C.T. Transport (Castleford) Limited | Transport & logistics | 1973 |
| C.T. Transport (Castleford) Partners LLP | | 2012 |
| C.T. Transport (Castleford) Partnership LLP | | 2012 |
| Cabe Care Ltd | Health & social care | 2024 |
| CAD - Tech (UK) Limited | Information & communication | 2013 |
| Cadital Ltd | Other services | 2004 |
| Cainward Limited | Hospitality | 2023 |
| Cakemark Limited | Wholesale & retail | 2009 |
| Calder Conservation Limited | Professional & scientific | 2020 |
| Callum Wray Investments Ltd. | Real estate | 2023 |
| Calsa Care Limited | Health & social care | 2006 |
| Caltons Body Shop Ltd | Wholesale & retail | 2025 |
| Caltons Leisure Ltd | Wholesale & retail | 2019 |
| Candor Projects Ltd | Construction | 2022 |
| Canning Dove O'Hara Partnership LLP | | 2017 |
| Canton Chef Grove Villa Ltd | Hospitality | 2023 |
| Capital Advisory Finance Ltd | Financial services | 2026 |
| Capital Commercial Finance Ltd | Financial services | 2026 |
| Capital Finance Group Holdings Ltd | Financial services | 2026 |
| Carl Knapper Limited | Information & communication | 2008 |
| Carleton Court Care Limited | Health & social care | 2000 |
| Carleton Grange Club Limited | Hospitality | 2004 |
| Carleton Grange Nursery Limited | Health & social care | 2015 |
| Carleton Grange Trust | Other services | 2004 |
| Carleton Mews Management Company Limited | Real estate | 2007 |
| Carleton Road Management Company Limited | Real estate | 2011 |
| Carlile Estate & Will Planning Limited | Professional & scientific | 2024 |
| Carlile Financial Ltd | Financial services | 2016 |
| Carpinello Limited | Wholesale & retail | 2025 |
| Carrick Commercial Limited | Construction | 2014 |
| Cartners Cafe Bar Limited | Hospitality | 2020 |
| Cartwright Property Ltd | Real estate | 2025 |
| CAS GAS Spares Ltd | Wholesale & retail | 2022 |
| Castle Construction (Leeds) Limited | Construction | 2009 |
| Castle Security & Electrical Ltd | Construction | 2016 |