| Bronlake Limited | Professional & scientific | 2009 |
| Bronte Holdings NE Limited | Real estate | 2024 |
| Brooke Contractor Solutions Ltd | Financial services | 2014 |
| Brookfield Autos NE Ltd | Wholesale & retail | 2024 |
| Brookfield Convenience Store Limited | Wholesale & retail | 2013 |
| Brookfield NE Limited | Administrative & support | 2024 |
| Brookfield Process Engineering Limited | Professional & scientific | 2022 |
| Brookland Estates Property Sourcing Ltd | Wholesale & retail | 2022 |
| Brookleigh Caring Services Limited | Health & social care | 2004 |
| Brooklyn Pizza (Linthorpe) Ltd | Hospitality | 2025 |
| Brooklyn Pizza (M'Bro) Ltd | Hospitality | 2023 |
| Brooklyn Pizza NE Ltd | Hospitality | 2026 |
| Brooks ENG Ltd | Professional & scientific | 2026 |
| Brooks Learning Strategies Ltd | Education | 2013 |
| Brookson (5252B) Limited | Information & communication | 2007 |
| Brookson (5484L) Limited | Administrative & support | 2007 |
| Brothers in INK Limited | Other services | 2011 |
| Brothers in Limited | Arts & recreation | 2011 |
| Brough Mews Management Company Limited | Households | 1982 |
| Broughton Breeding Ltd | Agriculture & fishing | 2024 |
| Brow Doll Ltd | Other services | 2024 |
| Brows Bliss Ltd | Other services | 2023 |
| Brows by RAZ & Beauty Clinic Ltd | Other services | 2022 |
| Browzing Limited | Other services | 2024 |
| Brpink Ltd | Professional & scientific | 2023 |
| BRT Business Excellence Award Ltd | Professional & scientific | 2025 |
| Bruce Property Management Limited | Real estate | 2024 |
| BS Contracts Ltd | Construction | 2024 |
| BS Developments & Recycling Ltd | Construction | 2018 |
| BS Scaffolding Assets Ltd | Construction | 2024 |
| BS Scaffolding Commercial Limited | Construction | 2024 |
| BS Scaffolding Consultancy LLP | | 2026 |
| BS Scaffolding Group Ltd | Financial services | 2023 |
| BS Scaffolding Land Ltd | Financial services | 2024 |
| BS Scaffolding Ltd | Construction | 2014 |
| Bsbb Ltd | Hospitality | 2020 |
| BSH Management Limited | Administrative & support | 2019 |
| BSH Property Rentals Limited | Real estate | 2024 |
| BSH Racing Limited | Agriculture & fishing | 2014 |
| BSH Residential Limited | Real estate | 2026 |
| BSM Engineering and Management Services Ltd | Construction | 2026 |
| Bssl Group Ltd | Construction | 2023 |
| BST Piping Limited | Manufacturing | 2018 |
| BSV Employee Services Ltd | Professional & scientific | 2025 |
| BT Promotions NE Limited | Arts & recreation | 2013 |
| BTA Consultancy Ltd | Administrative & support | 2017 |
| BTC NE Ltd | Construction | 2025 |
| BTM Access Ltd | Manufacturing | 2017 |
| Btxl Properties Ltd | Real estate | 2025 |
| Bualah Land Family of GOD Centre Ltd | Other services | 2026 |
| Bubble Hand Car Wash (NE) Ltd | Administrative & support | 2024 |
| Bubblegum Group Ltd | Wholesale & retail | 2025 |
| Bubbles Car Valeting Ltd | Other services | 2019 |
| Bubo AI Ltd | Information & communication | 2019 |
| Bucharest Mini Market (NE) Ltd | Wholesale & retail | 2025 |
| Buddies Group Ltd | Education | 2026 |
| Buddy Car Wash Ltd | Administrative & support | 2022 |
| Build My Gaff Ltd | Construction | 2025 |
| Build NE 24 Ltd | Construction | 2025 |
| BUILD100 Ltd | Construction | 2026 |
| Builder Edge Ltd | Construction | 2025 |
| Builders Direct Ltd | Other services | 2026 |
| Builders of Business Ltd | Other services | 2025 |
| Bulk Tainer Transport Limited | Transport & logistics | 2018 |
| Bulkbridge Ltd | Wholesale & retail | 2025 |
| Bulkhaul (International) Limited | Professional & scientific | 1983 |
| Bulkhaul Limited | Transport & logistics | 1981 |
| Bulldog Brickwork Ltd | Construction | 2023 |
| Bulmer Hair Shop Ltd | Other services | 2025 |
| Bunnies Mobile Tattoos Limited | Arts & recreation | 2013 |
| Bunzz & Grill Ltd | Hospitality | 2025 |
| Buraaq Tech Limited | Wholesale & retail | 2025 |
| Burbage Hospitality Ltd | Hospitality | 2017 |
| Burdett Investment Group Ltd | Financial services | 2026 |
| Burger Day Ltd | Hospitality | 2025 |
| Burgers NE Middlesbrough Limited | Hospitality | 2025 |
| Burgess Industrial Supplies Limited | Wholesale & retail | 2020 |
| Burhanx Ltd | Wholesale & retail | 2026 |
| Buried Crowns Limited | Arts & recreation | 2015 |
| Burnside Distribution Ltd | Transport & logistics | 2019 |
| Burnside E-Commerce Fulfillment Ltd | Transport & logistics | 2020 |
| Burtons Fabrications Ltd | Manufacturing | 2026 |
| Burtree MOT Centre Darlington Ltd | Wholesale & retail | 2025 |
| Burts Online Limited | Wholesale & retail | 2017 |
| Busby NY Properties Limited | Real estate | 2003 |
| Bushby Pre-Commissioning Services Ltd | Construction | 2021 |
| Business Computer Systems (Northern) Limited | Information & communication | 1993 |
| Business Growth Enterprise Ltd | Professional & scientific | 2022 |
| Business Process Innovators Limited | Financial services | 2018 |
| Bust the Dust Limited | Administrative & support | 2024 |
| Busy Bee's Property Solutions Limited | Construction | 2017 |
| Busy Bricks Ltd | Real estate | 2022 |
| Butler C&I Engineering Ltd | Administrative & support | 2013 |
| Butlers Construction NE Limited | Construction | 2011 |
| Butt Medical Responder Services Ltd | Health & social care | 2024 |
| Butter Fold Bakery Ltd | Wholesale & retail | 2024 |
| Butterfly Table Tennis (U.K.) Limited | Professional & scientific | 1979 |
| Buy @ Enjoy Ltd | Wholesale & retail | 2025 |
| Buy&Collect Ltd | Wholesale & retail | 2025 |
| Buylix Ltd | Wholesale & retail | 2026 |