| Black Lion (Snaith) Limited | Hospitality | 2016 |
| Black Stag Moto X LLP | | 2023 |
| Blackburn Material Solutions Ltd | Construction | 2020 |
| Blackfox Property Limited | Hospitality | 2023 |
| Blenkinsop Optical Limited | Wholesale & retail | 2005 |
| Blinks Cladding Ltd | Construction | 2019 |
| Blue Fulcrum Ltd | Professional & scientific | 2026 |
| Blue Water Marina Limited | Wholesale & retail | 1980 |
| Bluerock Digital Ltd | Information & communication | 2026 |
| Boasman Heating Services Ltd | Construction | 2012 |
| BOB Hill Properties Limited | Real estate | 2008 |
| BON BON Tattoo and Piercing Studios Ltd | Other services | 2022 |
| Boosters and Beyond Ltd | Wholesale & retail | 2023 |
| Boothferry Golf Club Limited | Arts & recreation | 2020 |
| Boothferry Supermakret Limited | Wholesale & retail | 2025 |
| BOSCO26 Ltd | Hospitality | 2026 |
| Bounce Digital Software and Services Limited | Information & communication | 2021 |
| Boxed Technical Ltd | Information & communication | 2022 |
| BP Developers Ltd | Real estate | 2024 |
| BPF Transport, Storage & Mechanical Services Ltd | Transport & logistics | 2025 |
| Braegate Trustees Ltd | Financial services | 2021 |
| Brankleys' Accommodation Services Ltd | Households | 2025 |
| Brantx Direct Limited | Wholesale & retail | 2022 |
| Brcare Connect CIC | Health & social care | 2025 |
| Brian Leighton (Garages) Limited | Wholesale & retail | 1965 |
| Bridgegate Financial Solutions Limited | Financial services | 2009 |
| Brigg Group Ltd | Financial services | 2023 |
| Brilliant Box Limited | Manufacturing | 2015 |
| Brinson Gaming Entertainment Ltd | Other services | 2022 |
| Brocklesby Building Products Limited | Construction | 2005 |
| Broco Consultancy Ltd | Professional & scientific | 2021 |
| Brookstone Chemicals Limited | Professional & scientific | 1976 |
| BTE Cladding Ltd | Construction | 2021 |
| BTT Holdings Limited | Financial services | 2018 |
| Buchanans of Yorkshire Ltd | Construction | 2023 |
| Buckshot Group Limited | Financial services | 2024 |
| Buffay Travel Ltd | Transport & logistics | 2024 |
| Building M Ltd | Construction | 2026 |
| Bula Bar Ltd | Wholesale & retail | 2018 |
| Buon Appetito Goole Limited | Hospitality | 2024 |
| Burfield Group Ltd | Agriculture & fishing | 2023 |
| Burlington Crescent Limited | Real estate | 2007 |
| Burn & Whitley Properties Limited | Construction | 2005 |
| Burn Fencing Limited | Construction | 1975 |
| Busy Energy Ltd | Construction | 2012 |
| Butler Group Yorkshire Limited | Wholesale & retail | 2023 |
| Butterfly Dance Studios Ltd | Education | 2019 |
| Butterworth Homes Limited | Real estate | 2020 |
| C & J Stonemasonry Limited | Construction | 2010 |
| C & P Living Ltd | Hospitality | 2025 |
| C Hill (Sykehouse) Limited | Wholesale & retail | 2002 |
| C Hirst Property Ltd | Real estate | 2020 |
| C L Hair Academy Ltd | Education | 2025 |
| C M Tyreman Ltd. | Wholesale & retail | 2018 |
| C P Morgan Consultancy Ltd | Professional & scientific | 2017 |
| C S Backhouse Storage Ltd | Transport & logistics | 2021 |
| C T Safety Barriers Limited | Construction | 2009 |
| C.A.S. Refreshments Ltd | Wholesale & retail | 2024 |
| C.J. Operations Ltd | Manufacturing | 2016 |
| C.S. Backhouse Limited | Agriculture & fishing | 2007 |
| CAB Executive Travel Limited | Transport & logistics | 2006 |
| CAB Tours Limited | Transport & logistics | 2006 |
| Cairngorm Coach Travel Limited | Transport & logistics | 2004 |
| Cairngorm SKI Services Limited | Administrative & support | 1977 |
| Cairngorm Transport Limited | Transport & logistics | 1995 |
| Cambrian Creels (ECC) Limited | Manufacturing | 2019 |
| Cambrian Granite ( Howden ) Ltd | Manufacturing | 2011 |
| Camilla Nails and Beauty Services Limited | Other services | 2020 |
| CAN Burgess Deliveries Ltd | Transport & logistics | 2017 |
| Can'T Fail Ltd | Real estate | 2017 |
| Canterbury House Limited | Wholesale & retail | 2005 |
| Caravan Recovery Services Limited | Transport & logistics | 2016 |
| Care Graphic Engineering Limited | Extraterritorial | 2025 |
| Care Graphic Machinery Limited | Wholesale & retail | 1986 |
| CARE3 Labs Ltd | Information & communication | 2026 |
| Carls Recycling Services Ltd | Water & waste | 2008 |
| Carlton Aquisitions Ltd | Hospitality | 2016 |
| Carlton Global Ltd | Professional & scientific | 2017 |
| Carlton Playgroup Limited | Education | 2012 |
| Carlton Service Station Ltd | Wholesale & retail | 2011 |
| Carlton Supermarket Limited | Wholesale & retail | 2013 |
| Carlton Towers Events Ltd | Hospitality | 2015 |
| Carpenters Arms (MW) Ltd | Hospitality | 2017 |
| Carrotty Property Services Ltd | Construction | 2025 |
| Cartref Lettings Ltd | Real estate | 2024 |
| Castaway-Goole Ltd. | Education | 2008 |
| Castle View Service & MOT Station Ltd | Wholesale & retail | 2020 |
| Castle Views Property Ltd | Real estate | 2024 |
| Castleford Car Centre Limited | Extraterritorial | 2017 |
| Catcon UK Ltd | Water & waste | 2021 |
| Cathedral Restaurants Limited | Hospitality | 2017 |
| Cave Retreats Ltd | Hospitality | 2026 |
| Cawthorn Family Assessments Ltd | Health & social care | 2026 |
| CDR Consultancy Ltd | Health & social care | 2024 |
| CDS GAS Services Ltd | Construction | 2019 |
| Ceesquared Limited | Professional & scientific | 2018 |
| Cellartree Interiors Ltd | Construction | 2024 |
| Centaurus Group Limited | Professional & scientific | 1975 |
| Central Garage Snaith Ltd | Wholesale & retail | 2019 |
| Centre Line Promotions Limited | Professional & scientific | 1997 |