| B&B Holiday Lets Ltd | Real estate | 2024 |
| B&K Enterprises Ltd | Agriculture & fishing | 2011 |
| B&R Consultancy Ltd | Education | 2022 |
| B&T Restaurant Ltd | Hospitality | 2024 |
| B&X Body Works Ltd | Wholesale & retail | 2024 |
| B&Z Design Services Limited | Construction | 2016 |
| B.A. and C. Pearson Limited | Agriculture & fishing | 1992 |
| B.C. & T. Consultants Limited | Professional & scientific | 1986 |
| B.P.D Inspection Services Ltd | Professional & scientific | 2023 |
| B5E Limited | Other services | 2022 |
| B5E Properties Limited | Other services | 2022 |
| Baba Jon's Takeaway Ltd | Hospitality | 2024 |
| Babtem Ltd | Wholesale & retail | 2024 |
| Baby Face Beauty Ltd | Other services | 2025 |
| Back in the Day Classic Car Restoration Ltd | Administrative & support | 2020 |
| Backshield Services Limited | Water & waste | 1994 |
| Backstage Barbers 15 Ltd | Other services | 2025 |
| Baha Limited | Hospitality | 2024 |
| Bailey and Bailey Consulting UK Ltd | Administrative & support | 2022 |
| Baileyrotamech Ltd | Professional & scientific | 2025 |
| Baines Jewitt Limited | Professional & scientific | 2012 |
| BAJ Realisations Limited | Manufacturing | 1985 |
| Baking Bosses Limited | Professional & scientific | 2025 |
| Balaji Properties Limited | Real estate | 2006 |
| Baltic Site Services Ltd | Construction | 2026 |
| Bandoffice 2 Limited | Real estate | 1993 |
| Bandoffice Limited | Real estate | 1992 |
| Bankfield Limited | Professional & scientific | 2005 |
| Baqson Ltd | Education | 2025 |
| Bar 73 Ltd | Hospitality | 2023 |
| Barclay Roofing Limited | Construction | 1986 |
| Bare Faced Aesthetics Ltd | Other services | 2025 |
| Bare State Group Ltd | Wholesale & retail | 2026 |
| Barker & Co (North East) Ltd | Construction | 2021 |
| Barker & Stonehouse Limited | Wholesale & retail | 1968 |
| Barnby DUN Limited | Households | 2016 |
| Barnett Industrial Services Ltd | Construction | 2023 |
| Barngate Properties Limited | Real estate | 2012 |
| Barratt & Sons Heating & Plumbing Limited | Construction | 2021 |
| Barrow 4 Hire Ltd | Administrative & support | 2020 |
| Barton Commercial Tyres Limited | Wholesale & retail | 1986 |
| Bartr Connect Limited | Administrative & support | 2018 |
| Bartr Technologies Limited | Information & communication | 2017 |
| Barwick 1967 Limited | Extraterritorial | 2013 |
| Barwick Co Holdings Ltd | Professional & scientific | 2026 |
| Barwick Dental Ceramics and Laboratory Services Limited | Health & social care | 2017 |
| Barwick Inspection Services Limited | Professional & scientific | 2022 |
| Base NE Ltd | Construction | 2024 |
| Baseline QA Ltd | Information & communication | 2025 |
| Basicxii Ltd | Information & communication | 2025 |
| Baslon (UK) Limited | Information & communication | 2006 |
| Basset Pubs Ltd | Hospitality | 2018 |
| Bathing Bliss (UK) Ltd | Wholesale & retail | 2014 |
| Battlezone Paintball Limited | Arts & recreation | 2010 |
| Bauer Radio's Cash for Kids Charities | Health & social care | 2007 |
| Baytree Interiors Direct Ltd | Real estate | 2016 |
| BBE Renewables Ltd | Construction | 2026 |
| Bbqd Grill Limited | Hospitality | 2019 |
| BC & Sons Property Limited | Real estate | 2021 |
| BC Quality Consultants Limited | Professional & scientific | 2025 |
| BC Rigging Services Ltd | Professional & scientific | 2025 |
| Bc.Trucking Ltd | Professional & scientific | 2023 |
| BCM Safety Limited | Construction | 2024 |
| BCW Investments Limited | Administrative & support | 2005 |
| BD & M Ltd | Construction | 2025 |
| BDM Events Ltd | Administrative & support | 2022 |
| BE Trading Ltd | Information & communication | 2018 |
| Beacos Solutions Ltd | Health & social care | 2020 |
| Beal Hire Ltd | Construction | 2020 |
| Beale Property Services Ltd | Other services | 2025 |
| Beanie Games Limited | Wholesale & retail | 2013 |
| Beanie Gifts Limited | Wholesale & retail | 2019 |
| Beartech DEV Ltd | Information & communication | 2023 |
| Beat Clothing Ltd | Wholesale & retail | 2026 |
| Beatnikpics Development Company Limited | Professional & scientific | 2026 |
| Beatrix Borzos Logistics Limited | Transport & logistics | 2025 |
| Beau Visage Hartburn Limited | Other services | 2021 |
| Beaumont Medchem Dmpk Consulting Limited | Professional & scientific | 2025 |
| Beautified by AJ Limited | Wholesale & retail | 2025 |
| Beautified by Grace Limited | Wholesale & retail | 2025 |
| Beautus Ltd | Other services | 2025 |
| Beauty and a Beasting Ltd | Extraterritorial | 2020 |
| Beautylicious Limited | Other services | 2019 |
| BEC Taverns Ltd | Hospitality | 2025 |
| Beck & Harper Limited | Hospitality | 2008 |
| Becko Trade Ltd | Transport & logistics | 2022 |
| Becobond Transport Ltd | Transport & logistics | 2019 |
| Bedford Street Events Ltd | Hospitality | 2024 |
| BEE Clear Ltd. | Water & waste | 2002 |
| BEE Property Rentals Ltd | Administrative & support | 2021 |
| Beechwood Holiday Homes Ltd | Hospitality | 2021 |
| Begc Holdings Limited | Real estate | 2016 |
| Beige (N.E) Limited | Hospitality | 2015 |
| BEL Viso Limited | Other services | 2014 |
| Belasongs Ltd | Information & communication | 2024 |
| Belfast LLC UK Ltd | Wholesale & retail | 2025 |
| Bella Ryah Cosmetics Limited | Wholesale & retail | 2019 |
| Bella’S Pizza Ltd | Hospitality | 2024 |
| Belle Property Maintenance Limited | Construction | 2021 |
| Belmont Psychological Services Ltd | Health & social care | 2024 |