| Arncliffe Garage Limited | Wholesale & retail | 2013 |
| Artisan Tree Management Limited | Administrative & support | 2018 |
| Ascent Compliance Ltd | Professional & scientific | 2025 |
| Ashbourne Farming | Administrative & support | 2010 |
| Aspire to Thrive Ltd | Professional & scientific | 2023 |
| Associated Structural Detailers Limited | Professional & scientific | 2014 |
| Astute Building Services Limited | Construction | 2013 |
| ATD Labels and Packaging Limited | Manufacturing | 2020 |
| ATK Projects Ltd | Construction | 2025 |
| Austick Performance Group Ltd | Wholesale & retail | 2025 |
| Auto Lift Recovery Services Ltd | Wholesale & retail | 2025 |
| Autotest (2009) Limited | Wholesale & retail | 2009 |
| Avanti Motors Holdings Limited | Administrative & support | 2025 |
| AVF Marketing Limited | Professional & scientific | 2005 |
| Avocet Interiors Limited | Professional & scientific | 2025 |
| Avrs Rail Consulting Limited | Transport & logistics | 2014 |
| Axis Packaging Limited | Wholesale & retail | 2025 |
| B and L Audiology (MLR) Medicolegal Reporting Ltd. | Health & social care | 2016 |
| B Carlin Construction Ltd | Construction | 2019 |
| B Carlin Properties Ltd | Real estate | 2022 |
| B.M.H Electrical Services Ltd | Construction | 2022 |
| B.Scott Construction Management Services Limited | Construction | 2025 |
| BAG 2 School Limited | Administrative & support | 2015 |
| Bainton Technical Services Ltd | Professional & scientific | 2021 |
| Ballantyne's Chocolates and Confectionery Ltd | Wholesale & retail | 2020 |
| Ballard Medical Limited | Health & social care | 2014 |
| Bannister Prentice Limited | Professional & scientific | 2016 |
| Barron Media Ltd | Information & communication | 2016 |
| Bars Unlimited Ltd | Manufacturing | 2020 |
| Bartholemewdanielsassociates Ltd | Professional & scientific | 2025 |
| Barton Rose Holsteins | Agriculture & fishing | 2014 |
| Bay Dreamer Yachts Limited | Professional & scientific | 2014 |
| Bayonet Brewing Ltd | Manufacturing | 2024 |
| Bean Creative Limited | Wholesale & retail | 2008 |
| Beanie Tools Ltd | Manufacturing | 2012 |
| Beantown Limited | Professional & scientific | 2023 |
| Beatitude Aesthetics Ltd | Other services | 2016 |
| Beatz Holdings Ltd | Financial services | 2019 |
| Beaumont Brown Architects LLP | | 2011 |
| Beckfix Ltd | Construction | 2016 |
| Bedale Day Nursery Limited | Health & social care | 2014 |
| Bedale Farm Collections Limited | Agriculture & fishing | 2018 |
| Bedale Motor Factors Limited | Wholesale & retail | 1992 |
| Bedale Window Cleaning Services Ltd | Administrative & support | 2015 |
| Belbin Finch Limited | Construction | 2025 |
| Benchmark Retail Services Limited | Other services | 2000 |
| Berriff Ltd | Households | 2020 |
| Best Touch Services Ltd | Wholesale & retail | 2025 |
| Betterdaze Ltd | Wholesale & retail | 2018 |
| Bianco 2 Ristorante Ltd | Hospitality | 2020 |
| Bianco Property Holdings Ltd | Financial services | 2020 |
| Biffa Sutherland Tattoos Limited | Other services | 2019 |
| Bigbang Sports Promotions Ltd | Arts & recreation | 2025 |
| Binks Property Holdings Limited | Financial services | 2016 |
| Binks Woodland Services Limited | Real estate | 2015 |
| Binsoe Consultants Limited | Professional & scientific | 2025 |
| Binsoe Holdings Ltd | Wholesale & retail | 2025 |
| Binsoe Prop Co Limited | Real estate | 2022 |
| Birkby Plant & Civil Engineering Ltd | Construction | 2024 |
| BJB Joinery and Building Limited | Construction | 2017 |
| Blackhills Barn Limited | Hospitality | 2024 |
| Blackmark Components Ltd | Manufacturing | 2025 |
| Blenkiron Farming Company | Agriculture & fishing | 2012 |
| Blitz & Go Ltd | Administrative & support | 2025 |
| Blok-It Ltd | Wholesale & retail | 2016 |
| Blossom Home Care North East Ltd | Other services | 2025 |
| Blossom Homecare Northallerton Ltd | Other services | 2024 |
| Blossoms Blooming Holding Group Ltd | Financial services | 2024 |
| Blue Elevate Ltd | Manufacturing | 2025 |
| Blue Mind Healing CIC | Health & social care | 2025 |
| Blue Opal Investments Limited | Real estate | 2011 |
| Blue Sky Charters (Mallorca) Limited | Transport & logistics | 2007 |
| Bluebird L&D Limited | Education | 2026 |
| Bluelight Health Ltd | Health & social care | 2023 |
| Blueline Express Limited | Transport & logistics | 1988 |
| Body and Brows Events Ltd | Education | 2022 |
| Body and Brows Supplies Ltd | Wholesale & retail | 2024 |
| Body and Mind Nutrition Ltd | Other services | 2024 |
| Boogie Bounce Northallerton Limited | Arts & recreation | 2025 |
| Boroughbridge Brick + Tile Limited | Extraterritorial | 1987 |
| Botanibaby Limited | Manufacturing | 2025 |
| Braeside Marine Limited | Professional & scientific | 2025 |
| Braithwaite's Garden Centre Ltd | Wholesale & retail | 2018 |
| Brian Robinson Machinery Limited | Wholesale & retail | 2004 |
| Brierley Homes Limited | Construction | 2016 |
| Brit Streaming Company Ltd | Information & communication | 2018 |
| Broadacres Services Management Limited | Households | 2014 |
| Brompton Court Ltd | Real estate | 2023 |
| Brompton MOT Centre Ltd | Wholesale & retail | 2026 |
| Brookes Construction and Shopfitting Limited | Construction | 2018 |
| Brosch Consultancy Ltd | Professional & scientific | 2008 |
| Brown of Helmsley Limited | Transport & logistics | 1987 |
| Bruff Drinks Limited | Professional & scientific | 2023 |
| Bryony Designs Limited | Manufacturing | 2015 |
| BS Greenwoods Ltd | Administrative & support | 2011 |
| BSA Properties Limited | Real estate | 2011 |
| Buckland Leisure Limited | Hospitality | 2019 |
| Bullamoor Barns Ltd | Hospitality | 2023 |
| Bullamoor Ltd | Agriculture & fishing | 2018 |
| Business Genie Limited | Extraterritorial | 1997 |