| Bubbl Software Ltd | Information & communication | 2024 |
| Bubble Vapes Ltd | Wholesale & retail | 2025 |
| Buchanan’S Football for ALL Ltd | Education | 2022 |
| Buciu Ltd | Health & social care | 2018 |
| Buckley Burnett Limited | Construction | 2011 |
| Bucks Midland Services Ltd | Other services | 2021 |
| Budget Plan Limited | Professional & scientific | 1970 |
| Budget Windows Limited | Construction | 2023 |
| Bugajewski Ltd | Other services | 2015 |
| Build Warranty Group Ltd | Professional & scientific | 2018 |
| Build Warranty Insurance Services Ltd | Financial services | 2018 |
| Build Warranty Technical Services Ltd | Professional & scientific | 2018 |
| Building Works 4U Limited | Construction | 2025 |
| Buildings for Business Limited | Extraterritorial | 2004 |
| Buildmer Limited | Construction | 2006 |
| Buildpro NE Ltd | Construction | 2025 |
| Built UP North Limited | Wholesale & retail | 2018 |
| Bulger Bros Surfacing Ltd | Construction | 2021 |
| Bullford Limited | Hospitality | 2002 |
| Bulmer Investments (North East) Limited | Professional & scientific | 2018 |
| Bumblewright Properties Limited | Real estate | 2018 |
| Burghelea Investment Ltd | Real estate | 2023 |
| Burghelea Ltd | Health & social care | 2015 |
| Burlington House Estates Ltd | Real estate | 2026 |
| Burnell Cottages Limited | Real estate | 2023 |
| Burnell Investments Limited | Other services | 2017 |
| Burnlee Ltd | Real estate | 2012 |
| Burnopfield Cricket Club Limited | Arts & recreation | 2014 |
| Bush Street Ltd | Real estate | 2020 |
| Business Development Intelligence Ltd | Information & communication | 2023 |
| Business Energy Quotes Ltd | Other services | 2019 |
| Business Space Solutions Gateway West Limited | Real estate | 2012 |
| Buston & Maughan Properties Limited | Real estate | 2017 |
| Busyshop Ltd | Wholesale & retail | 2020 |
| Butlers Drinks Group Limited | Wholesale & retail | 2021 |
| Butterfield Electrical Limited | Construction | 2016 |
| Buttery Toast Ltd | Arts & recreation | 2022 |
| Buxton Residential Ltd | Real estate | 2019 |
| Buy Smart Ltd | Wholesale & retail | 2016 |
| BUYFIX4LESS Ltd | Wholesale & retail | 2019 |
| Buyit Management Ltd | Real estate | 2020 |
| Buzz Piping & Instrumentation Systems Limited | Construction | 2018 |
| BW Housing Ltd | Administrative & support | 2025 |
| BWI Group Limited | Financial services | 2021 |
| Byaban Ltd | Hospitality | 2020 |
| Bytemax Computers Limited | Information & communication | 2012 |
| Bytewiseit Limited | Information & communication | 1988 |
| C & a Hall Holdings Limited | Financial services | 2025 |
| C & D Circus Productions Limited | Hospitality | 2010 |
| C & M Property Management Limited | Real estate | 2005 |
| C & T Productions Limited | Arts & recreation | 2018 |
| C & Y NE Ltd | Hospitality | 2025 |
| C a Hall Ltd | Real estate | 2022 |
| C and I Property Investment Limited | Real estate | 2023 |
| C Anderson Joinery & Building Services Ltd | Construction | 2022 |
| C Armstrong Electrical Limited | Construction | 2013 |
| C Brown Joinery Ltd | Manufacturing | 2026 |
| C Charlton Lettings North East Limited | Real estate | 2025 |
| C Convery TM Ltd. | Construction | 2017 |
| C Davey (NE) Limited | Other services | 2017 |
| C Hall Wind Ltd | Administrative & support | 2023 |
| C Lindsay Legal Services Ltd | Professional & scientific | 2024 |
| C M a Assessments Limited | Education | 2013 |
| C Popescu Ltd | Health & social care | 2024 |
| C S Accounting Limited | Professional & scientific | 2012 |
| C S I Roots Limited | Other services | 2002 |
| C V S Concepts Ltd | Real estate | 2020 |
| C W Ortho Ltd | Health & social care | 2011 |
| C&C Industries Ltd | Information & communication | 2022 |
| C&D Facades Innovations Limited | Construction | 2024 |
| C&Ld Properties Ltd | Real estate | 2026 |
| C&M Global Property Ltd | Real estate | 2019 |
| C&S Property Management (NE) Limited | Real estate | 2024 |
| C. & H. Optics Limited | Health & social care | 2010 |
| C. Thompson Machines Limited | Wholesale & retail | 1984 |
| C.C.W Installations Limited | Construction | 2009 |
| C.D.R Mechanical Limited | Construction | 2023 |
| C.I.B. (Life & Pensions) Limited | Financial services | 1987 |
| C.I.S Cleaning Intelligence Services Ltd | Administrative & support | 2025 |
| C.S.L. Construction Limited | Construction | 2002 |
| C.Torr Ltd | Professional & scientific | 2023 |
| C2 Detailing Ltd | Administrative & support | 2023 |
| C88KIE Ltd | Hospitality | 2023 |
| Cabkit Ltd | Wholesale & retail | 2025 |
| CAC Durham Ltd | Wholesale & retail | 2025 |
| CAC Gosforth Ltd | Wholesale & retail | 2025 |
| CAC Stow Ltd | Wholesale & retail | 2025 |
| CAC Tynemouth Ltd | Wholesale & retail | 2025 |
| CAC Value Ltd | Wholesale & retail | 2025 |
| CAC Woodstock Ltd | Wholesale & retail | 2025 |
| Cadetx Ltd | Information & communication | 2026 |
| Caesar Pizza Gateshead Ltd | Hospitality | 2026 |
| Cafe Darkhane Ltd | Hospitality | 2025 |
| Cafe Mountain Ltd | Wholesale & retail | 2020 |
| Cafe Under the Spire Limited | Hospitality | 2021 |
| Cake Creations Ltd | Hospitality | 2025 |
| Cake Stories LLP | | 2015 |
| Cakebox Scunthorpe Limited | Wholesale & retail | 2023 |
| Cakes Unusual Limited | Manufacturing | 2025 |
| Calcot Asbestos Recruitment Limited | Administrative & support | 2014 |