| 10-12 Hawkins Road Management Company Limited | Households | 1996 |
| 7JAY Home Care Ltd | Health & social care | 2012 |
| Austin Foods Ltd | Hospitality | 2022 |
| Beco Ltd | Extraterritorial | 2024 |
| Been Coffee House Ltd | Wholesale & retail | 2023 |
| Black by Design Limited | Wholesale & retail | 2010 |
| Boam Properties Limited | Real estate | 2023 |
| Boat Street Ltd | Hospitality | 2020 |
| Bpkat Castle Ltd | Wholesale & retail | 2026 |
| Cheswold Limited | Other services | 1993 |
| Dakota Electronics Ltd | Professional & scientific | 2015 |
| Durham Medics Ltd | Professional & scientific | 2022 |
| Durham Motor Company Limited | Wholesale & retail | 2004 |
| Durham Specialist Cars Limited | Wholesale & retail | 2021 |
| Eisa's Spice Ltd | Hospitality | 2021 |
| Fast Flip Services Limited | Wholesale & retail | 2021 |
| Forsyte Investments Limited | Professional & scientific | 1949 |
| G.T. Tape Solutions Limited | Wholesale & retail | 2012 |
| Grange Hill Productions Limited | Extraterritorial | 2023 |
| Great North Eats Ltd | Hospitality | 2020 |
| GSO Limited | Administrative & support | 2013 |
| H F S Holdings (Willington) Limited | Financial services | 2023 |
| Hardy's Funeral Service Limited | Other services | 2008 |
| Honey Utopia Limited | Extraterritorial | 2023 |
| Hurst Grove Management Company Limited | Real estate | 2001 |
| I V M Ltd | Manufacturing | 2003 |
| J. Shorten & Sons Limited | Transport & logistics | 1980 |
| Jetberg Limited | Wholesale & retail | 1976 |
| Just Detailing Ltd | Administrative & support | 2024 |
| Kings Office Supplies Limited | Wholesale & retail | 2014 |
| Madecorn Developments Limited | Construction | 2024 |
| Madecorn Leisure LLP | | 2005 |
| Marina Masala Limited | Hospitality | 2017 |
| Maximizon Ltd | Professional & scientific | 2022 |
| Merchant's Jewellers Ltd | Wholesale & retail | 2018 |
| Mercia Construction Ltd | Construction | 2022 |
| Mercia Marina Ltd | Arts & recreation | 2017 |
| Mercia Networks Ltd | Information & communication | 2022 |
| New SH Limited | Hospitality | 2025 |
| Nigel Woolston Carpentry & Maintenance Work Limited | Construction | 2013 |
| Oakenshield Kitchens and Bathrooms Limited | Construction | 2013 |
| Oakes Consultancy Ltd | Professional & scientific | 2018 |
| Phew Design Limited | Information & communication | 2001 |
| PHF Consulting Limited | Administrative & support | 2020 |
| Ploszajski Lynch Consulting Ltd | Administrative & support | 2001 |
| Premier Shops Online Ltd | Wholesale & retail | 2011 |
| Quality Building Equipment Limited | Administrative & support | 2001 |
| Quality Gloves Ltd | Administrative & support | 2017 |
| Slam Community Development Trust Limited | Arts & recreation | 2005 |
| THE Honest Hanger Ltd | Wholesale & retail | 2026 |
| THE Mersey Television Company Limited | Extraterritorial | 2023 |
| THE Practice @ Ltd | Health & social care | 2018 |
| Wrights Builders Ltd | Construction | 2019 |