| Babylon Property Investments Ltd | Construction | 2022 |
| Backbone Welding Solutions Ltd | Manufacturing | 2026 |
| Bafrik Rental and Logistics Limited | Administrative & support | 2026 |
| Baggs Consulting Limited | Professional & scientific | 2010 |
| Baltic Products Limited | Wholesale & retail | 2024 |
| Baltic Street Properties Ltd | Real estate | 2024 |
| Banu Limited | Professional & scientific | 2012 |
| Bar One Hartlepool Ltd | Hospitality | 2026 |
| Barello Ltd | Wholesale & retail | 2024 |
| Bark and Bone Ltd | Other services | 2021 |
| Barnfield Property Letting Ltd | Real estate | 2016 |
| Bastion Chatsworth Limited | Real estate | 2024 |
| BAZ Shawarma Ltd | Hospitality | 2025 |
| Bcbg Event Management Ltd | Arts & recreation | 2020 |
| Bcet Hughes Ltd | Information & communication | 2025 |
| BCG Collectibles Ltd | Other services | 2025 |
| Bcms Services Limited | Other services | 2017 |
| BE Amazing Consultancy Limited | Professional & scientific | 2026 |
| BE Equestrian Apparel Ltd | Wholesale & retail | 2025 |
| Beautubes Limited | Information & communication | 2026 |
| Beccalump Site Management Limited | Professional & scientific | 2012 |
| Beech Wood (Castle Eden) Residents Limited | Real estate | 2011 |
| Beginning Limited | Professional & scientific | 2025 |
| Bekd Limited | Professional & scientific | 2026 |
| Bell & Summers Accountants Limited | Professional & scientific | 2026 |
| Bell Family Holdings Limited | Financial services | 2026 |
| Bella Universe Ltd | Wholesale & retail | 2026 |
| Bellcourt Ventures Limited | Construction | 2010 |
| Belle VUE Community, Sports & Youth Centre Limited | Arts & recreation | 2002 |
| Bellevue Booze Ltd | Wholesale & retail | 2021 |
| Bellevue Wine Ltd | Wholesale & retail | 2018 |
| Bellway Heating Ltd | Construction | 2022 |
| Bellwood Rewinds Limited | Manufacturing | 1998 |
| Bentley Mathieson Holdings Limited | Financial services | 2024 |
| Bentley Mathieson Ltd | Health & social care | 2021 |
| Bentley Mathieson Property Limited | Real estate | 2024 |
| Bers Group Ltd | Wholesale & retail | 2026 |
| Bertha Holding Ltd | Real estate | 2017 |
| Besocial Ltd | Information & communication | 2026 |
| Bespoke Maintenance Cleaning Ltd | Administrative & support | 2025 |
| Best CUT Northeast Ltd | Other services | 2023 |
| Best Fisheries Ltd | Wholesale & retail | 2026 |
| Best Line Electrical Services Ltd | Construction | 2017 |
| Best Rooms UK Ltd | Real estate | 2016 |
| Bestem Limited | Professional & scientific | 2014 |
| Bestly Limited | Construction | 2004 |
| Bett Solutions Ltd | Administrative & support | 2026 |
| BG Electrical Inspection Limited | Professional & scientific | 2012 |
| Bg&Tj Logistics Ltd | Transport & logistics | 2025 |
| Bgtb Offshore Ltd | Professional & scientific | 2025 |
| BGW Inspection Limited | Construction | 2024 |
| BH Welding Operations Ltd | Manufacturing | 2018 |
| Bianco Bros Ltd | Hospitality | 2019 |
| Bianco Estates Limited | Real estate | 2023 |
| Bias Electrical Services Ltd | Construction | 2024 |
| Bias Planning Limited | Professional & scientific | 2022 |
| Big Fish Garage Limited | Wholesale & retail | 2026 |
| Big Gorilla Signs Limited | Manufacturing | 2014 |
| Bige Management Limited | Professional & scientific | 2023 |
| Bike Corner UK Limited | Wholesale & retail | 2025 |
| Billingham & Hartlepool Storage Ltd | Transport & logistics | 2020 |
| Billingham Kitchens Limited | Wholesale & retail | 2012 |
| Billy Blackford Limited | Construction | 2014 |
| Billy Lumb Estates Ltd | Real estate | 2025 |
| Bims Radiance Cleaning Limited | Administrative & support | 2025 |
| Bingoal Holdings Limited | Arts & recreation | 2022 |
| Birch Software Limited | Information & communication | 2016 |
| Birchwood Project Management Ltd | Professional & scientific | 2026 |
| Bjbm Limited | Wholesale & retail | 2024 |
| BJM Property Group Limited | Real estate | 2023 |
| Black Boxes Storage Limited | Administrative & support | 2024 |
| Black Cat Telecom Ltd | Wholesale & retail | 2019 |
| Black Pearl Pipeline Limited | Construction | 2025 |
| Blackburn Group Holdings Ltd | Financial services | 2025 |
| Blackhall Cricket Club Juniors CIC | Education | 2025 |
| Blackhall Navy Club Ltd | Hospitality | 2024 |
| Blackwood Outdoors Ltd. | Wholesale & retail | 2011 |
| Blands Property (NE) Ltd | Real estate | 2025 |
| Blast Aspersions Ltd | Construction | 2020 |
| Blenco Connect Ltd | Education | 2025 |
| Blitz-It (Cleaning) Limited | Other services | 2006 |
| Blohmskie Ltd | Hospitality | 2020 |
| Bloom Childcare Limited | Health & social care | 2024 |
| Bloom Property Holdings Ltd | Real estate | 2022 |
| Bloominart Northeast C.I.C. | Arts & recreation | 2014 |
| Blossom and Bear Events Ltd | Health & social care | 2025 |
| BLS Roofing Specialist Limited | Professional & scientific | 2019 |
| BLU Elephant Lettings Ltd | Real estate | 2017 |
| BLU Sky Homes Ltd | Real estate | 2015 |
| Blue Dominic Workshop Supplies Ltd | Wholesale & retail | 2023 |
| Blue Poplar Ltd | Real estate | 2024 |
| Blue Sky Living (Teesside) Ltd. | Real estate | 2005 |
| Blue Sky Quantity Surveying Limited | Professional & scientific | 2015 |
| Bluefern Enterprises Ltd | Extraterritorial | 2026 |
| BM F&C Consultancy Ltd | Professional & scientific | 2025 |
| Bm-Zone Ltd | Wholesale & retail | 2020 |
| BMA Property Services Ltd | Real estate | 2020 |
| BNL Property Ltd | Real estate | 2023 |
| Bo-Ax Construction Limited | Construction | 2024 |
| Boag Traders Fabrications Ltd | Manufacturing | 2018 |