| Bakth Lettings Ltd | Real estate | 2025 |
| BAL Dhillons Ltd | Hospitality | 2025 |
| Balance of Creation Limited | Administrative & support | 2021 |
| Balmoral Laundry Limited | Other services | 2025 |
| Balmoral Learning Trust | Education | 2012 |
| Baltal Consulting Limited | Professional & scientific | 2014 |
| Balti Express Sunderland Limited | Hospitality | 2023 |
| Bamco Five Limited | Information & communication | 2004 |
| Bamco Sixty Limited | Real estate | 2016 |
| Bamco Sixtyone Limited | Administrative & support | 2017 |
| Bancroft Lettings Limited | Real estate | 2022 |
| BANDB24 Ltd | Hospitality | 2024 |
| Baneberry Consulting Ltd | Other services | 2025 |
| Banh MI 179 Limited | Hospitality | 2024 |
| Bank Hair and Beauty Limited | Other services | 2017 |
| Banuk Cipher Itsolutions Limited | Information & communication | 2025 |
| Banyan Arts Community Interest Company | Arts & recreation | 2017 |
| Barak NE Ltd | Hospitality | 2016 |
| Barakah Retail Limited | Wholesale & retail | 2022 |
| Barber & Whale Limited | Wholesale & retail | 2014 |
| Bargain Flys Ltd | Wholesale & retail | 2024 |
| Bargain Mall Newcastle Ltd | Wholesale & retail | 2025 |
| Barnes Academy Trust | Education | 2014 |
| Barnes Demolition Ltd | Construction | 2026 |
| Barracks to Boardroom CIC | Professional & scientific | 2024 |
| Barreconcept International Limited | Arts & recreation | 2019 |
| Barretts Butchers Ltd | Wholesale & retail | 2008 |
| Barron Homes Limited | Real estate | 2025 |
| Barry Sanderson (Property) Limited | Professional & scientific | 2005 |
| Bars Leisure (North East) Limited | Hospitality | 2006 |
| Bartitsu & Antagonistics Forum Ltd | Education | 2026 |
| Bartram Developments Limited | Construction | 2001 |
| Bartram Flooring Services Ltd | Construction | 2002 |
| Base UK Home Improvements Ltd | Construction | 2026 |
| Basi-Mann Property Ltd | Real estate | 2017 |
| Baskerville Securities Ltd | Financial services | 2017 |
| Batchboost Ltd | Wholesale & retail | 2024 |
| Bateleur Property Ltd | Real estate | 2024 |
| Bathroom Cladding Store Ltd | Wholesale & retail | 2015 |
| Bathrooms Express (Sunderland) Limited | Wholesale & retail | 2020 |
| Baxter and Pattison Decorating and Building Services Limited | Construction | 2008 |
| Baxters Pizza Ltd | Hospitality | 2022 |
| Baytul ILM Academy Ltd | Education | 2021 |
| Bazrad Reporting Limited | Health & social care | 2024 |
| BB Windtech Limited | Professional & scientific | 2023 |
| BBA Housing Ltd | Construction | 2024 |
| BBT (EU) Ltd. | Manufacturing | 2003 |
| Bbtippers Limited | Transport & logistics | 2016 |
| BCK Properties Limited | Real estate | 2023 |
| BD the Hair Academy Collective Limited | Other services | 2023 |
| BDS Group Nationwide Limited | Construction | 2013 |
| BDS Property Group Ltd | Real estate | 2023 |
| BE Brave Sunderland Community Interest Company | Health & social care | 2023 |
| BE Unstoppable Limited | Arts & recreation | 2021 |
| Beacon Consulting Group Ltd | Professional & scientific | 2026 |
| Beacon Drive Residents Association Limited | Households | 2005 |
| Beacon of Light Limited | Real estate | 2014 |
| Beamcore Construction Ltd | Construction | 2025 |
| Beami Limited | Professional & scientific | 2018 |
| Bean Visual Limited | Other services | 2018 |
| Beau Hair & Beauty Ltd | Other services | 2018 |
| Beautaholics Limited | Wholesale & retail | 2020 |
| Beautiman Property’S Ltd | Real estate | 2023 |
| Beckem Marine Ltd | Transport & logistics | 2021 |
| Beckwith Consultants Limited | Construction | 2025 |
| Beckwith Properties Sunderland Ltd | Real estate | 2025 |
| Becoming Visible Limited | Other services | 2004 |
| BED and Furniture Store Ltd | Wholesale & retail | 2025 |
| Bede Brook Residents Limited | Households | 2011 |
| Bede Tower Limited | Administrative & support | 2013 |
| Bede's Monastery @ Monkwearmouth Limited | Arts & recreation | 2008 |
| Bedebrooke Lettings Limited | Real estate | 2011 |
| Bedford&Dough Limited | Hospitality | 2025 |
| BEE EM Group Ltd | Wholesale & retail | 2024 |
| BEE Enchanted C.I.C. | Health & social care | 2020 |
| Beech Tree Properties and Investments Limited | Real estate | 2025 |
| Beechwood Sofas Limited | Manufacturing | 2004 |
| Beeline Networks Ltd | Information & communication | 2017 |
| Beem Group Properties Limited | Real estate | 2025 |
| Bees, Trees and Muddy Knees C.I.C. | Arts & recreation | 2022 |
| Before WE Meet Limited | Health & social care | 2018 |
| Beforeafter Story Ltd | Information & communication | 2025 |
| Beicraft Ltd | Information & communication | 2023 |
| Beldi Business Solutions Ltd | Wholesale & retail | 2026 |
| Beldi Global Limited | Wholesale & retail | 2026 |
| Beldi London Limited | Manufacturing | 2024 |
| Belgravia Decor Limited | Manufacturing | 1978 |
| Bell Auditing & Consultancy Services Limited | Professional & scientific | 2024 |
| Bell's Blade Services Ltd | Manufacturing | 2019 |
| Bella Esthetica Ltd | Other services | 2021 |
| Bella Jean Properties Ltd | Real estate | 2026 |
| Bella Marie Academy Ltd | Education | 2019 |
| Bellas Enterprise Limited | Arts & recreation | 2022 |
| Belle Events & Exhibitions Limited | Information & communication | 2014 |
| Belleisimo Pizza Sales Ltd | Hospitality | 2011 |
| Bellissimo 13 Limited | Wholesale & retail | 2019 |
| Belmont PUB Co Ltd | Hospitality | 2024 |
| Belvedere Investments Limited | Financial services | 2014 |
| Belvelly Bridge Properties Limited | Real estate | 2024 |
| Belzer Designs Ltd | Professional & scientific | 2025 |