| Boilerhouse Gentleman Limited | Other services | 2020 |
| Borek Transport Ltd | Transport & logistics | 2020 |
| Bowman Assets and Estates Limited | Manufacturing | 2024 |
| Bowman Global Wealth Management Ltd | Financial services | 2026 |
| Boxing & Kick-Boxing Fundamental Centre Ltd | Education | 2025 |
| Branchcrest Technology Limited | Information & communication | 2011 |
| Branded Hair & Beauty Ltd | Other services | 2023 |
| Bricks & Straws Ltd | Construction | 2023 |
| Bricks and Mortar Brickwork Services Ltd | Construction | 2014 |
| Bricksandgames Ltd | Professional & scientific | 2022 |
| Britto's Ltd | Hospitality | 2021 |
| Britto's Newcastle Ltd | Hospitality | 2021 |
| Browns Security NE Limited | Administrative & support | 2025 |
| Brunswick Fencing Limited | Construction | 2012 |
| Brynco Ltd | Construction | 2010 |
| Buffed Glitch Ltd | Wholesale & retail | 2024 |
| Buildsafe Scaffolding ( Yorkshire) Limited | Construction | 2024 |
| Bullet Express Deals Limited | Wholesale & retail | 2025 |
| Bunny's Properties Limited | Real estate | 1999 |
| Burnard Accountants Ltd | Extraterritorial | 2025 |
| Burnard Ltd | Professional & scientific | 2020 |
| Burnip Engineering Ltd | Professional & scientific | 2024 |
| Burster Ltd | Arts & recreation | 2021 |
| Bushell & Weightman Consultancy Ltd | Financial services | 2017 |
| Business Matching UK Limited | Other services | 2024 |
| BY 11AM Limited | Professional & scientific | 2025 |
| BY Jade Aesthetics Ltd | Other services | 2022 |
| C & R Grieveson Ltd | Water & waste | 2014 |
| C and I Lifting Ltd | Construction | 2021 |
| C E N N E Ltd | Wholesale & retail | 2025 |
| C Jobling Limited | Other services | 2002 |
| C.A.N.D.O Consultancy Limited | Education | 2013 |
| C.H.I. (UK) Limited | Information & communication | 2005 |
| CA PHE Kong Ltd | Information & communication | 2015 |
| Cadag Limited | Real estate | 2013 |
| Cafe Hollywood to Bollywood Ltd | Hospitality | 2021 |
| Cafe on the Green Ltd | Hospitality | 2023 |
| CAI Enterprises Ltd | Professional & scientific | 2025 |
| Calascibettaco Ltd | Financial services | 2026 |
| Camden Clothing Alterations Limited | Wholesale & retail | 2018 |
| Cameron Vuong Boxing Limited | Arts & recreation | 2024 |
| Campbell Building Services Ltd | Construction | 2016 |
| Canny Goat Limited | Manufacturing | 2019 |
| Capio Group Limited | Administrative & support | 2022 |
| Capital Motor Group Limited | Extraterritorial | 2018 |
| Caprino Leisure Limited | Hospitality | 2024 |
| Capture by Souparnika Ltd | Professional & scientific | 2025 |
| Caraventure Ltd | Wholesale & retail | 2024 |
| Carbon DOT Limited | Administrative & support | 2024 |
| Caroline Property Developments Ltd | Real estate | 2020 |
| Carrolls Auto Services Limited | Wholesale & retail | 2017 |
| Carrolls Properties NE Ltd | Construction | 2022 |
| CARS2LIFE Ltd | Wholesale & retail | 2020 |
| Carter Capital Properties Ltd | Real estate | 2024 |
| Cartouche Kitchens Ltd | Wholesale & retail | 2023 |
| Cartouche Property Services Ltd | Construction | 2024 |
| Cascade Cash Management Limited | Professional & scientific | 2014 |
| Caspian Tooling & Plastics Ltd | Manufacturing | 1994 |
| Cass Dayes Ltd | Manufacturing | 2018 |
| Castle North East Ltd | Construction | 2018 |
| CAV Management Limited | Administrative & support | 2024 |
| CB & P Services Limited | Construction | 2025 |
| CDC Projects Ltd | Construction | 2024 |
| CDD Build Newcastle Ltd | Construction | 2023 |
| CDH Roofing (NE) Ltd | Construction | 2024 |
| Ceased Trading 10696892 Limited | Construction | 2017 |
| Celltech (N/E) Limited | Other services | 2010 |
| Centuri Heating & Bathrooms Ltd | Construction | 2020 |
| Centurion Multi-Academy Trust | Education | 2023 |
| Centurion Sports Ltd | Wholesale & retail | 2023 |
| CF Joinery (NE) Ltd | Construction | 2023 |
| CGB Interiors Ltd | Construction | 2015 |
| Chakona U.K. Ltd | Health & social care | 2016 |
| Chapiterestate Ltd | Information & communication | 2016 |
| Chapmans Logistics and Intelligent Technical Systems Ltd | Information & communication | 2023 |
| Chattha Properties Ltd | Real estate | 2021 |
| Cherry Parts Limited | Wholesale & retail | 1999 |
| Chicken Logo Productions Limited | Hospitality | 2022 |
| Choice Trading Services Limited | Wholesale & retail | 2020 |
| CHP Operational Services Ltd | Professional & scientific | 2019 |
| Chubb Security Services Ltd | Administrative & support | 2015 |
| Churchill&Co Limited | Wholesale & retail | 2024 |
| Cinemaguide Limited | Information & communication | 2026 |
| City Clean (Northern) Limited | Administrative & support | 2014 |
| Cj-It Ltd | Information & communication | 2024 |
| CJM Recycling Limited | Water & waste | 2015 |
| CJM Waste & Recycling Limited | Professional & scientific | 2022 |
| CJR Renovations NE Limited | Construction | 2026 |
| CL (NE) Ltd | Manufacturing | 2024 |
| Claret & Blue Engineering Ltd | Construction | 2025 |
| Clarke Lane Estate Management Ltd | Real estate | 2026 |
| Clarke Lane Partners Ltd | Real estate | 2026 |
| Clarke Lane Property Management LLP | | 2025 |
| CLC Utilities Limited | Manufacturing | 2018 |
| Cleaners Newcastle Ltd | Construction | 2026 |
| Clelland Interiors Ltd | Wholesale & retail | 2024 |
| Cloud Mantras Corporation Limited | Information & communication | 2025 |
| Cmrsengineering Ltd | Professional & scientific | 2024 |
| CNT3 Limited | Information & communication | 2023 |
| Cobalt Cafe Ltd | Hospitality | 2021 |