| Azimuth Engineering Ltd | Professional & scientific | 2018 |
| Aztec Telecom Ltd | Information & communication | 2002 |
| Aztecon Limited | Manufacturing | 1998 |
| B & C Brands Limited | Wholesale & retail | 2023 |
| B & N (Engineers) Limited | Wholesale & retail | 1972 |
| B & P Motors LP | | 2018 |
| B & R Designs Ltd | Construction | 2018 |
| B & S (Rentals) Limited | Administrative & support | 1992 |
| B & Y Building & Maintenance Limited | Construction | 2012 |
| B a Barbers 2025 Ltd | Other services | 2025 |
| B D Liddle Limited | Professional & scientific | 2021 |
| B L & H Limited | Professional & scientific | 2014 |
| B M BI Folding Doors Ltd. | Construction | 2009 |
| B MAC Building Specialists Limited | Construction | 2022 |
| B Peacock Ltd | Construction | 2023 |
| B&B Crave Ltd | Hospitality | 2025 |
| B&C Commercial Group Ltd | Real estate | 2024 |
| B&C Properties (NE) Limited | Real estate | 2014 |
| B&K Engineering Solutions Ltd | Manufacturing | 2019 |
| B&M Alali Properties Ltd | Real estate | 2021 |
| B&M Flooring Ltd | Construction | 2016 |
| B. Marshall Marine Limited | Manufacturing | 2011 |
| B.Duffy Mechanical Ltd | Manufacturing | 2014 |
| B.E Mechanical Services Ltd | Construction | 2024 |
| B.Mhse Ltd | Administrative & support | 2026 |
| B.S. Lifting Services Limited | Professional & scientific | 2011 |
| B2 CW Ltd | Wholesale & retail | 2025 |
| B8 Kitchens and Bedrooms Ltd | Manufacturing | 2020 |
| Babatunde Titiloye Limited | Transport & logistics | 2023 |
| Babs Global Trade Limited | Wholesale & retail | 2025 |
| Baby Aura Ltd | Wholesale & retail | 2025 |
| Babylon (NE) Limited | Hospitality | 2026 |
| BAC Lifting Ltd | Construction | 2025 |
| Back to Brick Developments Ltd | Construction | 2022 |
| Backwell Heights Management Company Ltd | Households | 2026 |
| Baco Soft Expert Ltd | Transport & logistics | 2025 |
| Bacononline Limited | Wholesale & retail | 2024 |
| Badgers Consultancy Services Ltd | Financial services | 2025 |
| BAG Ette ME NOT Ltd | Manufacturing | 2021 |
| Baguette Boulevard Limited | Construction | 2012 |
| Bahb Ltd | Administrative & support | 2019 |
| Bahria Group Ltd | Wholesale & retail | 2024 |
| Bahu Cleaner Ltd | Administrative & support | 2025 |
| Bailey Inns Limited | Hospitality | 2018 |
| Bain Consultancy Limited | Information & communication | 2018 |
| Baines Instruments Limited | Mining & quarrying | 2013 |
| Bajrami Ltd | Administrative & support | 2022 |
| Baked & Brewed Ltd | Hospitality | 2025 |
| Baker Clinical Ltd | Health & social care | 2020 |
| Baker Furniture Limited | Wholesale & retail | 1994 |
| Baker Street Republic Ltd | Hospitality | 2019 |
| Bakers Bespoke Ltd | Wholesale & retail | 2008 |
| Bakes and Treats Bakery Ltd | Wholesale & retail | 2025 |
| Baketime Limited | Manufacturing | 2010 |
| Bakhti Enterprises (LLC) Ltd | Wholesale & retail | 2024 |
| Bako Barbershop Ltd | Other services | 2026 |
| Balam CH & Sons Retail Group Ltd | Wholesale & retail | 2025 |
| Balance Beauty Spa Ltd | Other services | 2025 |
| Balanced Care Services Ltd | Public administration | 2025 |
| Baldeon Solutions Limited | Construction | 2021 |
| Baldwin and Brydon Ltd | Health & social care | 2025 |
| Baldwin Izindlu LLP | | 2015 |
| Baleena Ltd | Wholesale & retail | 2024 |
| Balkani Market (NE) Ltd | Manufacturing | 2026 |
| Ballantyne Holdings Limited | Financial services | 2023 |
| Ballied UP Limited | Wholesale & retail | 2020 |
| Balliol Taxis Limited | Transport & logistics | 2021 |
| Balti House Billingham Limited | Hospitality | 2026 |
| Balti HUT North East Limited | Hospitality | 2016 |
| Balti Station Ltd | Hospitality | 2022 |
| Bamboo Market Ltd | Professional & scientific | 2024 |
| Bambu Aesthetics Ltd | Other services | 2022 |
| Bamsi Limited | Wholesale & retail | 2020 |
| Bandar Bill Ltd | Construction | 2025 |
| Banfield Direct Limited | Wholesale & retail | 2018 |
| Bangladeshi Global Films CIC | Professional & scientific | 2024 |
| Bankability UK CIC | Information & communication | 2025 |
| Bantcar Ltd | Wholesale & retail | 2023 |
| BAP Medya Limited | Wholesale & retail | 2025 |
| Bar Tech Solutions Ltd | Administrative & support | 2024 |
| Barakat Food (NE) Ltd | Wholesale & retail | 2026 |
| Barber Healthcare Limited | Manufacturing | 2007 |
| Barbican Real Estate Ltd | Real estate | 2018 |
| Bare Faced by Elle Limited | Other services | 2021 |
| Bare Mettle Consulting Ltd | Professional & scientific | 2025 |
| Bargain Nest Limited | Wholesale & retail | 2024 |
| Bargain Superstore Limited | Wholesale & retail | 2007 |
| Barkerend Builders Ltd | Construction | 2024 |
| Barlow Kelly Surfaces Limited | Construction | 2024 |
| Barlow Technology Limited | Administrative & support | 1996 |
| Barnard Castle Best Hand Car Wash Limited | Wholesale & retail | 2024 |
| Barnby Retail Limited | Wholesale & retail | 2024 |
| Barnes & Woodhouse Timber Packaging Ltd | Administrative & support | 2024 |
| Barnes HV Services Ltd | Professional & scientific | 2026 |
| Barnfather Construction Limited | Construction | 2013 |
| Barnowl Outdoor Limited | Education | 2017 |
| Barons Teesside Limited | Hospitality | 2019 |
| Barr Building and Landscaping Ltd | Construction | 2019 |
| Barrebound Ltd | Hospitality | 2024 |
| Barriertherm UK Quality Windows & Doors Limited | Construction | 2024 |