| Bruhenny Grange Hotel Ltd | Administrative & support | 2017 |
| Brunswick MOT and Tyre Centre Ltd | Wholesale & retail | 2025 |
| BS (Dton) Ltd | Hospitality | 2025 |
| BS Fabrications Limited | Manufacturing | 1991 |
| BS Supermarket Ltd | Wholesale & retail | 2014 |
| Bsba-Tees Limited | Professional & scientific | 2011 |
| BST Baltic Sea Transportation Company Ltd | Professional & scientific | 1999 |
| Bubble & Cone Ltd | Hospitality | 2024 |
| Buckinghamshire Orthopaedic Surgery Limited | Health & social care | 2020 |
| Buda Beauty Ltd | Other services | 2025 |
| Buff Daddy Valets (NE) Ltd | Administrative & support | 2024 |
| Build My Extension Limited | Construction | 2020 |
| Build My RIG Ltd | Manufacturing | 2026 |
| Buildec Solutions Limited | Construction | 2016 |
| Buildoria Ltd | Construction | 2024 |
| Bullet Liner UK Ltd | Manufacturing | 2023 |
| Bumps and Bloom Ltd | Wholesale & retail | 2019 |
| Bundy Limited | Other services | 2024 |
| Bunker Golf Ltd | Wholesale & retail | 2025 |
| Burdon Hall Properties Limited | Real estate | 2026 |
| Burdon Properties Ltd | Real estate | 2024 |
| Burger Boss Darlo Ltd | Hospitality | 2025 |
| Burger Sides Limited | Hospitality | 2024 |
| Burgess Roughton Limited | Professional & scientific | 1995 |
| Burgess Technology Services Limited | Information & communication | 2015 |
| Burnside Mill Management Company Limited | Households | 2002 |
| Burraq Ocean Limited | Wholesale & retail | 2023 |
| Burrlowski Ltd | Wholesale & retail | 2023 |
| Burtree Auto Repair Centre Limited | Wholesale & retail | 2014 |
| Burtree Inn Limited | Hospitality | 2008 |
| Business & Property Solutions Holdings Limited | Financial services | 2022 |
| Businessrescueexpert (Caledonia) Limited | Professional & scientific | 2026 |
| Businessrescueexpert (NW) Limited | Professional & scientific | 2025 |
| Bussey and Armstrong Limited | Construction | 1949 |
| Butler House (North East) Ltd | Financial services | 2020 |
| Buttercup Homes & Lettings Ltd | Extraterritorial | 2017 |
| Butterfields Property Development Limited | Real estate | 2023 |
| Butterfly Properties Limited | Real estate | 2024 |
| Butterfly Touch Therapies Limited | Education | 2018 |
| Buying Hub Limited | Wholesale & retail | 2026 |
| Buzz Construction Services Ltd | Construction | 2026 |
| Buzz Joinery Ltd | Construction | 2021 |
| BW Barbering Limited | Other services | 2025 |
| BWB Group Ltd | Wholesale & retail | 2024 |
| BWL Professional BID Services Ltd | Professional & scientific | 2020 |
| BY ML - Nails - Beauty - Training Ltd | Other services | 2025 |
| Byron Robinson Logistics Ltd | Transport & logistics | 2025 |
| C & F Developments Ltd | Real estate | 2020 |
| C & J Roofing and Property Maintenance Ltd | Construction | 2024 |
| C & L Plumbing and GAS Services Limited | Construction | 2019 |
| C & S Paving Services Ltd | Construction | 2017 |
| C B Interests Limited | Administrative & support | 2024 |
| C G Egan Ltd | Other services | 2024 |
| C Hamilton Construction Ltd | Construction | 2022 |
| C I Stephens Ltd | Wholesale & retail | 2025 |
| C J Allen Limited | Construction | 2017 |
| C J Edwards Enterprises Ltd | Wholesale & retail | 2014 |
| C L Transport NE Limited | Transport & logistics | 2019 |
| C N P Consortium Limited | Real estate | 2016 |
| C S Housing Developments Limited | Construction | 2020 |
| C S Scaffolding Limited | Construction | 2014 |
| C&C Construction Consultants Ltd | Construction | 2024 |
| C&C Solutions Limited | Information & communication | 2025 |
| C&C Works Consulting Ltd | Professional & scientific | 2024 |
| C&M Houses Ltd | Real estate | 2024 |
| C&P Waters Property Services Limited | Construction | 2015 |
| C&R Holdings (NE) Ltd | Construction | 2018 |
| C&S Solutions Ltd | Professional & scientific | 2011 |
| C-Ginn Ltd | Transport & logistics | 2024 |
| C-Tech Services Ltd | Professional & scientific | 2017 |
| C. Robson Building Services Limited | Construction | 2003 |
| C. Suttie Plumbing & Heating Services Limited | Construction | 2017 |
| C. Thompson & Sons (Groundworks) Limited | Construction | 2010 |
| C.A.S.T Offshore Limited | Administrative & support | 2012 |
| C.M Tree Care Limited | Agriculture & fishing | 2017 |
| C3 Impact Ltd | Professional & scientific | 2025 |
| C6 Carbon Ltd | Manufacturing | 2018 |
| C9 London Road Limited | Hospitality | 2017 |
| C:Tose Ltd | Construction | 2025 |
| CA Round Limited | Administrative & support | 2019 |
| CAB AID Limited | Administrative & support | 2004 |
| CAB C Solutions Ltd | Administrative & support | 2025 |
| CAB Construction North East Ltd | Construction | 2024 |
| Cables Travel Ltd | Transport & logistics | 2011 |
| Caedmon Flats Limited | Households | 2009 |
| Caelae Ltd | Wholesale & retail | 2025 |
| Cafe Italissimo Ltd | Hospitality | 2020 |
| Cafe Spice Indian Restaurant Limited | Hospitality | 2014 |
| CAG Management Solutions Limited | Professional & scientific | 2008 |
| Caiger Towers Consulting Ltd | Professional & scientific | 2023 |
| Cairney Homes Limited | Real estate | 2025 |
| Cake Addict Ltd | Wholesale & retail | 2019 |
| Calabash Business Corporation Ltd | Information & communication | 2016 |
| Calabro Ltd | Real estate | 2010 |
| Calamander Vision Ltd | Education | 2022 |
| Calcis Heritage Ltd | Construction | 2021 |
| Calder's Kitchen Limited | Manufacturing | 2015 |
| Callie Private Ltd | Health & social care | 2016 |
| Callum Murphy Ltd | Professional & scientific | 2022 |
| Cally Smith Childcare Ltd | Health & social care | 2020 |