| Banw Properties Ltd | Real estate | 2024 |
| Barnes Family Holdings Ltd | Real estate | 2017 |
| Barnes Family Partnership LLP | | 2022 |
| Barry Family Holdings Ltd | Real estate | 2019 |
| Barton Environmental Services Limited | Construction | 1988 |
| Barton Family Partnership LLP | | 2021 |
| Barton Industrial Group Limited | Construction | 2016 |
| Barton Industrial Scaffolding Limited | Construction | 2017 |
| Barton Properties (NE) Limited | Construction | 2020 |
| Bathley LLP | | 2020 |
| Batter & Cones Ltd | Hospitality | 2026 |
| BBL (Investments) Limited | Financial services | 2016 |
| Bcml Telecoms Limited | Wholesale & retail | 2026 |
| BCW Holdings (N/E) Limited | Administrative & support | 2011 |
| BE Pivotal Ltd | Information & communication | 2024 |
| Beans and Cheese Ltd | Hospitality | 2026 |
| Beaufort Properties Ltd | Real estate | 2017 |
| Beaufort Property Partnership LLP | | 2017 |
| Beautiful Scenarios Limited | Professional & scientific | 2015 |
| Beaver Management Services Limited | Mining & quarrying | 1996 |
| Beck Property Management Ltd | Real estate | 2016 |
| Bedford House Holdings Ltd | Real estate | 2021 |
| Bedford House Partnership LLP | | 2021 |
| Beepee Properties Ltd | Real estate | 2024 |
| Beesure HR Ltd | Administrative & support | 2023 |
| Bellcroft Estates Limited | Real estate | 2020 |
| Bellerophon Consultancy Ltd | Professional & scientific | 2026 |
| Bellingham Enterprise Ltd | Real estate | 2025 |
| Bellissimo Spaces Limited | Construction | 2023 |
| Bema Rail Training Academy Limited | Extraterritorial | 2012 |
| Bema Rail Training Limited | Professional & scientific | 2011 |
| Bemaze Limited | Real estate | 2019 |
| Benjamin's Pride Limited | Other services | 2019 |
| Benny Medical Services PVT Ltd | Health & social care | 2024 |
| Benson Catering Services Ltd | Hospitality | 2025 |
| Benson Wood Limited | Professional & scientific | 2002 |
| Bentley Accountancy Limited | Professional & scientific | 2015 |
| Beogroup Ltd | Financial services | 2015 |
| Beresford Family Partnership LLP | | 2020 |
| Berkshire Lending Group Ltd | Financial services | 2023 |
| Bespoke Educational Support Limited | Professional & scientific | 2024 |
| Beveridge Housing Limited | Professional & scientific | 2013 |
| BFB Golf Ltd | Information & communication | 2026 |
| BFC Promotions Limited | Arts & recreation | 2019 |
| BGH Trading Ltd | Hospitality | 2022 |
| BH10110 Ltd | Real estate | 2020 |
| Bhardwaj Property Investment Limited | Real estate | 2025 |
| Bhatti Brothers NE Ltd | Hospitality | 2024 |
| Big BOY Media Ltd | Hospitality | 2003 |
| Bill Ingham's V8 Customs Ltd | Wholesale & retail | 2025 |
| Billingham and Norton PCN Ltd | Health & social care | 2026 |
| Billingham Bumblebee Solutions Ltd | Transport & logistics | 2025 |
| Billingham Courier Ltd | Transport & logistics | 2025 |
| Billingham Cricket Club Limited | Hospitality | 2024 |
| Billingham EFW Limited | Energy | 2018 |
| Billingham Environmental Link Programme Limited | Health & social care | 2010 |
| Billingham Fire & Electrical Services Limited | Construction | 2009 |
| Billingham Green Garage Limited | Wholesale & retail | 1957 |
| Billingham Headway Limited | Real estate | 2007 |
| Billingham Legacy Foundation Limited | Professional & scientific | 2010 |
| Billingham Lifting Ltd | Construction | 2024 |
| Billingham Machine Company Limited | Manufacturing | 1997 |
| Billingham Minimarket NE Limited | Wholesale & retail | 2024 |
| Billingham Motorcars Ltd | Wholesale & retail | 2021 |
| Billingham Synthonia Juniors Football Club CIC | Education | 2020 |
| Billingham Town Association Football Club Limited | Arts & recreation | 2018 |
| Billingham Windows and Conservatories Limited | Construction | 1996 |
| Billzander Family Partnership LLP | | 2021 |
| Billzander Limited | Real estate | 2021 |
| Bishop Health Ltd | Financial services | 2023 |
| Bisla Family LLP | | 2021 |
| BK and SON Family Partnership LLP | | 2022 |
| BK and SON Holdings Ltd | Real estate | 2022 |
| BK Fabrications Ltd | Professional & scientific | 2025 |
| Blackout Customizing Ltd | Wholesale & retail | 2019 |
| Blake & Blake Ltd | Professional & scientific | 2023 |
| Blass Family Holdings Ltd | Real estate | 2017 |
| Blass Family Partnership LLP | | 2017 |
| Blaze Contracts Ltd | Professional & scientific | 2016 |
| Blaze Games Limited | Information & communication | 2025 |
| Blaze Networks Limited | Information & communication | 2002 |
| Bless Baraka Properties Ltd | Real estate | 2023 |
| Bliss Business Services Ltd | Information & communication | 2025 |
| Blissfull Massage and Beauty Ltd | Health & social care | 2023 |
| BLK Engineering Limited | Construction | 2011 |
| Blue Aardvark Holdings Limited | Real estate | 2015 |
| Blue Aardvark Joinery Limited | Manufacturing | 2008 |
| Blue Whale Homes Ltd | Real estate | 2021 |
| Blue Whale Homes Partnership LLP | | 2021 |
| Blueberry Developments Limited | Financial services | 2022 |
| Bluebirds Investments Ltd | Financial services | 2026 |
| Bluefin Events Limited | Administrative & support | 2015 |
| Blychem Limited | Manufacturing | 1996 |
| BMS Rail Limited | Construction | 2017 |
| Bmsl Contracting Ltd | Administrative & support | 2008 |
| Bmsl Group Holdings Limited | Professional & scientific | 2024 |
| Bmsl Rail Limited | Construction | 2017 |
| BNY Investments Group Limited | Administrative & support | 2023 |
| Bogdan's Car FIX Garage Ltd | Wholesale & retail | 2022 |
| Boho Cafe Limited | Hospitality | 2016 |