| Balmoral 27-37 Baxter Mews RTM Company Limited | Real estate | 2023 |
| Baltic Windows Limited | Construction | 2007 |
| Bapp Industrial Supplies (North East) Limited | Wholesale & retail | 2002 |
| Bar Failte Limited | Hospitality | 2026 |
| Bar Luma Limited | Hospitality | 2005 |
| Basbe Services Ltd | Other services | 2022 |
| BASE2 Training Limited | Education | 2015 |
| Bass Jamz Limited | Information & communication | 2024 |
| Bastion I.T. Services Limited | Information & communication | 1990 |
| Batchworks Ltd | Extraterritorial | 2010 |
| Bavington Limited | Extraterritorial | 1996 |
| Baxter Housing Limited | Real estate | 2025 |
| Baxter Offshore Limited | Transport & logistics | 2025 |
| Baxter Property Lettings Limited | Real estate | 2024 |
| Bbar CLS Ltd | Hospitality | 2021 |
| Beaumont Garage Limited | Wholesale & retail | 2006 |
| Beaumont Umbilical Project Services Limited | Professional & scientific | 2013 |
| Beauty NE Ltd | Other services | 2025 |
| Bedi Group Limited | Real estate | 2016 |
| BEE in the BAG LLP | | 2024 |
| Bell Residentials Ltd | Real estate | 2022 |
| Beltech Services Limited | Manufacturing | 2008 |
| Bench Marque (GBR) Limited | Wholesale & retail | 2008 |
| Bennett Building & Roofing Ltd | Construction | 2018 |
| Benton House Limited | Real estate | 2011 |
| Bermondsey NE Limited | Real estate | 2021 |
| Bespoke Financial Protect Limited | Financial services | 2021 |
| Bespoke Metal Works Ltd | Manufacturing | 2014 |
| Bettakleen Limited | Administrative & support | 1998 |
| Beyex Ltd | Professional & scientific | 2024 |
| Bfhs | Other services | 2008 |
| BG Construction and Developments Limited | Construction | 2017 |
| BG Mechanical Technician Limited | Professional & scientific | 2019 |
| BGP (UK) Ltd | Professional & scientific | 2022 |
| Bhangus Store Ltd | Wholesale & retail | 2025 |
| Biddick Estates Limited | Professional & scientific | 2008 |
| Biddick Leisure Ltd | Hospitality | 2022 |
| Biddick Properties Limited | Real estate | 2021 |
| Big Dough Ltd | Hospitality | 2023 |
| BIM Consultancy Limited | Professional & scientific | 2020 |
| Bimzpro Services Limited | Wholesale & retail | 2025 |
| Biochemix Ltd | Wholesale & retail | 2025 |
| BKW NE Limited | Administrative & support | 2022 |
| BKW Properties Limited | Real estate | 2020 |
| Bladetech North East Ltd | Professional & scientific | 2024 |
| Blaydon Builders Ltd | Construction | 2018 |
| Blenheim 38 to 48 (Evens) Baxter Mews RTM Company Limited | Real estate | 2023 |
| Blinkio Ltd | Information & communication | 2010 |
| Bloodline Entertainment Limited | Arts & recreation | 2025 |
| BLU JAR Properties Limited | Real estate | 2020 |
| Blue Cube Storage Horden Limited | Real estate | 2024 |
| Blue Hawk Events Limited | Administrative & support | 2012 |
| Blue House Retail Limited | Wholesale & retail | 2011 |
| Blue Soldier GAS Ltd | Construction | 2025 |
| Blue Star Gaming Ltd | Administrative & support | 2024 |
| Boddah Access Limited | Professional & scientific | 2014 |
| Bodycraft Commercial Repair Centre Limited | Wholesale & retail | 2020 |
| Borderline Taxis Limited | Transport & logistics | 2004 |
| Borderline Travel Limited | Transport & logistics | 2012 |
| Boss MAN Entertainment Ltd | Hospitality | 2015 |
| Boss-Retro Ltd | Real estate | 2015 |
| Bounce Back Media Ltd | Information & communication | 2021 |
| BP Scaffolding NE Ltd | Construction | 2018 |
| BPO Property Limited | Real estate | 2024 |
| Bpobrien Consultancy Limited | Information & communication | 2024 |
| Bq's Vanfix Limited | Wholesale & retail | 2021 |
| Bquest Limited | Other services | 2011 |
| Brack Leisure Limited | Administrative & support | 2020 |
| Bradshaw Homes Ltd | Real estate | 2014 |
| Brand Work Solutions Limited | Manufacturing | 2021 |
| Bratilda Consultancy Limited | Professional & scientific | 2023 |
| Bratilda Professional Development Limited | Education | 2019 |
| Brave Partnership Limited | Professional & scientific | 2025 |
| Breakwater Energy Aggregator, L.P. | | 2022 |
| Breakwater Energy, L.P. | | 2022 |
| Breningate Enterprise Ltd | Manufacturing | 2024 |
| Brice Wood Consulting Limited | Information & communication | 2024 |
| Bridges Health Care Ltd | Health & social care | 2025 |
| Briton Court (2020) RTM Company Limited | Real estate | 2020 |
| Broadoak First Class Kitchens Ltd | Professional & scientific | 2026 |
| Broadoak Kitchens Ltd | Construction | 2008 |
| Brocktone Limited | | 1992 |
| Brogan Scaffolding Limited | Construction | 2017 |
| Brogan Services Limited | Construction | 2023 |
| Brunton Enterprises Limited | Construction | 2014 |
| Bruvvas Holding Ltd | Financial services | 2023 |
| Bruvvas Limited | Transport & logistics | 2013 |
| Bryce Contractors Limited | Construction | 2011 |
| BS Randhawa Ltd | Wholesale & retail | 2013 |
| BSA Business Software Alliance, Inc. | | 1996 |
| Budget Cleaners Ltd | Administrative & support | 2020 |
| Build on Ltd | Construction | 2018 |
| Building Blocks Day Centre Community Interest Company | Education | 2019 |
| Bunsandslices Ltd | Hospitality | 2026 |
| Burki Ltd | Health & social care | 2024 |
| Butterflies & Buttercups Limited | Wholesale & retail | 2021 |
| Buy to LET NE Ltd | Real estate | 2022 |
| Bvbr Ltd | Professional & scientific | 2022 |
| Bysa Ltd | Hospitality | 2021 |
| C D Smith Limited | Other services | 2012 |