| Beamish Homes Ltd | Real estate | 2025 |
| Beamish Leisure Limited | Hospitality | 2024 |
| Beamish Museum Trading Limited | Arts & recreation | 2008 |
| Beamish Park Golf Club Limited | Arts & recreation | 1972 |
| Beamish Street Accident Repair Centre Limited | Wholesale & retail | 2009 |
| Bekarma Psychology Services Ltd | Health & social care | 2022 |
| Bellfam Engineering Ltd | Other services | 2013 |
| Benton Care Services Limited | Health & social care | 2015 |
| Better Process Ltd | Professional & scientific | 2018 |
| BEZ AI Limited | Wholesale & retail | 2023 |
| BHM Management & Cabling Limited | Construction | 2025 |
| Bianco KEL Limited | Real estate | 2020 |
| Bishop Freight Limited | Transport & logistics | 2017 |
| Bkms Construction Limited | Construction | 2025 |
| Black BEE RUM Company Limited | Manufacturing | 2022 |
| Black Dog Property Development Ltd | Real estate | 2021 |
| Black Dog Wellness Ltd | Health & social care | 2021 |
| Black Stag Properties Ltd | Real estate | 2019 |
| Blackwell Property Group Limited | Real estate | 2025 |
| Blackwood Property Maintenance Ltd | Construction | 2018 |
| Blaydon Bookkeeping Limited | Professional & scientific | 2010 |
| BLK Homes Ltd | Real estate | 2019 |
| Bluessom Limited | Real estate | 2025 |
| BM Construction (N.E.) Limited | Construction | 2007 |
| BMS Design & Consult Limited | Construction | 2025 |
| Bobby Moore Movie Limited | Information & communication | 2014 |
| BON Voyage Taxis Ltd | Transport & logistics | 2021 |
| BON Voyage Transport Ltd | Transport & logistics | 2021 |
| BON Voyage Travel Ltd | Transport & logistics | 2025 |
| Bone Appetit K9 Ltd | Other services | 2024 |
| Bood Limited | Health & social care | 2022 |
| Boultons Rigging Limited | Construction | 2021 |
| Bouncy House NE Limited | Administrative & support | 2025 |
| Bowes Leisure Limited | Wholesale & retail | 2025 |
| Boyds Buildings Limited | Households | 2022 |
| BR Coatings Limited | Construction | 2026 |
| Brambleberry Barn Ltd | Wholesale & retail | 2024 |
| Breakfast & JAM Limited | Real estate | 2020 |
| Breeze Logistics Limited | Transport & logistics | 2025 |
| Bridges NDT Limited | Professional & scientific | 2006 |
| Brimel Ltd | Real estate | 2024 |
| Britannia Study Link (UK) Limited | Education | 2024 |
| Broomco Acorn Ltd | Manufacturing | 2024 |
| Brow-A-Holic Ltd | Other services | 2018 |
| BS 919 Limited | Real estate | 2022 |
| Bsuk Property Limited | Real estate | 2026 |
| BSW Mobile Auto Electrics Limited | Wholesale & retail | 2013 |
| BTO Property Limited | Real estate | 2021 |
| Buddytime Co-Living Limited | Real estate | 2021 |
| Building Design Solutions Ltd | Professional & scientific | 2021 |
| Business Unmasked Ltd | Administrative & support | 2025 |
| BW Tanks Ltd | Manufacturing | 2025 |
| Bwtransport Ltd | Transport & logistics | 2025 |
| Bydaybreak Solutions Limited | Information & communication | 2026 |
| Byron Lodge Developments Ltd | Real estate | 2025 |
| C&C Building Contractors Limited | Construction | 2015 |
| C. Robson Construction Services Ltd | Construction | 2019 |
| CA Willcocks Logistics Ltd | Transport & logistics | 2025 |
| Cadenza Services Company Limited | Real estate | 2019 |
| Calcon Roofing & Building Ltd | Construction | 2024 |
| Call Murray Ltd | Administrative & support | 2020 |
| Camm Consultancy Limited | Professional & scientific | 2026 |
| Campbell Keeling Properties Limited | Real estate | 2020 |
| Cannylads Packaging Ltd | Administrative & support | 2020 |
| Capshall Technologies (UK) Ltd | Information & communication | 2019 |
| Caretech Consultancy Group Ltd | Professional & scientific | 2025 |
| Caroben Enterprises Ltd | Other services | 2026 |
| Carpet & Binding Online Ltd | Manufacturing | 2016 |
| Carpet & Binding Retail Ltd | Manufacturing | 2016 |
| Carpet & Binding Trade Ltd | Manufacturing | 2016 |
| Carrhaus Ltd | Wholesale & retail | 2025 |
| Carrs Services Limited | Information & communication | 2018 |
| Carruthers Transport Limited | Transport & logistics | 2017 |
| Catchgate Stores Limited | Wholesale & retail | 2015 |
| CB Property Developments Ltd | Construction | 2024 |
| Ccen Limited | Real estate | 2020 |
| Celebrants 4 U Ltd | Extraterritorial | 2025 |
| CG Control Solutions Limited | Information & communication | 2022 |
| CH Holdings (NE) Limited | Wholesale & retail | 2021 |
| Chambers Lpas Limited | Professional & scientific | 2013 |
| Change Fundraising Limited | Professional & scientific | 2017 |
| Charles Grey Menswear Limited | Wholesale & retail | 2023 |
| Charlotte Street Garage Ltd | Wholesale & retail | 2018 |
| Charlotte Ventures Ltd | Real estate | 2025 |
| Charlton & SON Groundworks Ltd | Construction | 2023 |
| Charlton Machinery Services Limited | Manufacturing | 2026 |
| Chase Medical Training Ltd | Education | 2024 |
| Chase ‘N EWE Properties Ltd | Real estate | 2022 |
| Cherry Living Limited | Real estate | 2020 |
| Chester Licensed Properties Limited | Real estate | 2009 |
| China - Parts Limited | Wholesale & retail | 2007 |
| Christopher Hinchliffe Ltd | Administrative & support | 2010 |
| Chun Chef Limited | Hospitality | 2024 |
| Chutzpah Media House Ltd | Information & communication | 2020 |
| CIL Europe Limited | Water & waste | 2012 |
| CIL Hygiene Limited | Water & waste | 2012 |
| CIL Properties Ltd | Real estate | 2025 |
| Cinnte Solutions Ltd | Information & communication | 2021 |
| Circadian Lighting Limited | Manufacturing | 2020 |
| Citibim (UK) Limited | Construction | 2021 |