| B M Bevan Ltd | Other services | 2018 |
| B. Smart Racing Limited | Extraterritorial | 2024 |
| B. Smart Syndicates Limited | Arts & recreation | 2024 |
| B.Summers Construction Ltd | Construction | 2025 |
| Bagby Airfield Ltd | Transport & logistics | 2026 |
| Bagby Construction Ltd | Construction | 2018 |
| Banner Tension Solutions Limited | Manufacturing | 2020 |
| Bara Consulting Ltd | Mining & quarrying | 2013 |
| Barks and Brambles Ltd | Extraterritorial | 2025 |
| Barleys Yard 1958 Limited | Extraterritorial | 2013 |
| Barlow Construction Limited | Construction | 2020 |
| Barter Traders Limited | Professional & scientific | 2018 |
| Bartercard Operations UK Ltd | Professional & scientific | 2014 |
| Baxter Clerical Limited | Administrative & support | 2022 |
| BD Spice (Thirsk) Ltd | Hospitality | 2025 |
| BD Sporting Services Limited | Arts & recreation | 2016 |
| Bedwell Bedding Limited | Manufacturing | 2011 |
| BEN Curtis Racing Services Limited | Arts & recreation | 2020 |
| BEN Horn Fulfilment Limited | Extraterritorial | 2024 |
| Benem Inns Ltd | Hospitality | 2019 |
| Benson Group Investments Limited | Financial services | 2018 |
| Beri Property Solutions Ltd | Real estate | 2024 |
| Best of Britain Holidays Limited | Administrative & support | 2010 |
| BGI Residential Limited | Real estate | 2020 |
| BH PUB Company (Atwick) Ltd | Hospitality | 2023 |
| BHF Marine Ltd | Construction | 2018 |
| BHF Welding & Fabrication Ltd | Manufacturing | 2025 |
| Bianco International Metals Ltd | Wholesale & retail | 2025 |
| Bianco Ristorante Ltd | Hospitality | 2019 |
| Big Bubble Consulting Limited | Information & communication | 2000 |
| Billandboo Ltd | Wholesale & retail | 2026 |
| Biotel Service UK Ltd | Wholesale & retail | 2020 |
| Bites N Brews Ltd | Hospitality | 2025 |
| Bitona Limited | Professional & scientific | 2019 |
| Black Lion (Thirsk) Ltd | Hospitality | 2018 |
| Black Wolf Fitness Ltd | Administrative & support | 2018 |
| Blacksmiths Arms(Bh) Limited | Hospitality | 2018 |
| Blenmore Properties Limited | Households | 1998 |
| Blue Charm Books Limited | Wholesale & retail | 2005 |
| Blue Serpent Technologies Limited | Information & communication | 2019 |
| Bluepig Energy Ltd | Manufacturing | 2025 |
| Blundell Estates Limited | Real estate | 2017 |
| Bracal Developments Ltd | Construction | 2017 |
| Brave Jump Limited | Education | 2012 |
| Brearey Building Experts Limited | Construction | 2024 |
| Brewer's Court Management Limited | Households | 1985 |
| Bridge Farm Yorkshire Limited | Agriculture & fishing | 2022 |
| Brigantia Partners Ltd | Administrative & support | 2015 |
| Brightening Lives Ltd | Health & social care | 2019 |
| Brilliant Lighting Limited | Professional & scientific | 2016 |
| Brilliant Lighting Trustees Limited | Administrative & support | 2024 |
| Brilliant Living (UK) Ltd | Construction | 2010 |
| Brilliant Living LLP | | 2010 |
| Broken Wing Barber Co Ltd | Other services | 2026 |
| Bromford Iron Ltd | Manufacturing | 2019 |
| Brown Bird and Company Limited | Manufacturing | 2021 |
| Bruce House Farms Limited | Administrative & support | 2009 |
| Bruu Ltd | Wholesale & retail | 2024 |
| Built in Furniture Limited | Construction | 2015 |
| Bumpdale Limited | Real estate | 1986 |
| Burner Services (Northern) Limited | Manufacturing | 2023 |
| Burtree House & Retreats Limited | Hospitality | 2021 |
| Busby Biomass Woodchip Services Limited | Transport & logistics | 2014 |
| Busby Stoop Garage Limited | Wholesale & retail | 2007 |
| Business Solutions (Yorkshire) Limited | Professional & scientific | 1992 |
| Butcher's Pet Care Limited | Manufacturing | 1983 |
| BWL Sales Limited | Wholesale & retail | 2005 |
| C & E Mandale Ltd | Agriculture & fishing | 2020 |
| C & S Phillips Ltd | Real estate | 2015 |
| C Alexander Property Ltd | Real estate | 2025 |
| C.E.W Catering Ltd | Hospitality | 2025 |
| Caee Group Holdings Limited | Financial services | 2022 |
| Caee Property Limited | Real estate | 2022 |
| Calculated Commercial Limited | Financial services | 2022 |
| Calculated Financial Services Limited | Financial services | 2022 |
| Calculated Group Ltd | Professional & scientific | 2010 |
| Calculated Ltd | Administrative & support | 2017 |
| Callaghan Jointing Services Ltd | Transport & logistics | 2025 |
| Calvari Limited | Real estate | 2019 |
| Calverts Carpets Online Sales Ltd | Wholesale & retail | 2020 |
| Calvis Cross LLP | | 2026 |
| Camchristow Thirsk Ltd | Hospitality | 2016 |
| Campio Marketing Ltd | Professional & scientific | 2024 |
| Capicus Limited | Financial services | 2015 |
| Capuic Limited | Financial services | 2026 |
| Carcorn Canines Ltd | Wholesale & retail | 2022 |
| Cardiologic Diagnostics Ltd | Wholesale & retail | 2026 |
| Cardiologic Holdings Ltd | Financial services | 2026 |
| Cardiologic Limited | Wholesale & retail | 2002 |
| Care Services Thirsk Limited | Health & social care | 2015 |
| Carl's Flowers, Fruit & VEG Limited | Wholesale & retail | 2014 |
| Carlton Contracting Services Limited | Agriculture & fishing | 1998 |
| Carr Lane Industrial Estate Ltd | Real estate | 2018 |
| Carson & Crawley Ltd | Wholesale & retail | 2017 |
| Carthouse Furniture Ltd | Manufacturing | 2003 |
| Castraguard Ltd | Construction | 2026 |
| Catton Kitchen Ltd | Wholesale & retail | 2021 |
| Celik Cold Plate Ltd | Hospitality | 2024 |
| Celli Asset Management (UK) Limited | Other services | 1997 |
| Celli Group (UK) Limited | Manufacturing | 1996 |