| Tynemouth Management Limited | Administrative & support | 2023 |
| Tynemouth Property Company Limited | Real estate | 2023 |
| Tynenet Communications Limited | Information & communication | 2026 |
| Tynenet Infrastructure Ltd | Construction | 2026 |
| Tynenet Ltd | Financial services | 2026 |
| Tynenew Ltd | Wholesale & retail | 2014 |
| Tyneside and Northumberland Mind | Health & social care | 2011 |
| Tyneside Auto Refinish Limited | Wholesale & retail | 2014 |
| Tyneside Badminton Centre CIC | Arts & recreation | 2011 |
| Tyneside Cinema | Information & communication | 1973 |
| Tyneside Cinema Trading Co. Ltd | Hospitality | 2013 |
| Tyneside Claims Ltd | Administrative & support | 2025 |
| Tyneside Community Digital Community Interest Company | Information & communication | 2020 |
| Tyneside Designs Limited | Administrative & support | 2016 |
| Tyneside Electrical Contractors Ltd | Manufacturing | 2025 |
| Tyneside Electrical Services Limited | Manufacturing | 2013 |
| Tyneside Estate Office Limited | Real estate | 1961 |
| Tyneside Flat Roofing Ltd | Construction | 2022 |
| Tyneside Fleet Limited | Administrative & support | 2025 |
| Tyneside Healthcare Facilities Limited | Health & social care | 2020 |
| Tyneside Heating Services Limited | Construction | 2013 |
| Tyneside Irish Cultural Society Limited | Arts & recreation | 1994 |
| Tyneside Leisure Ltd | Hospitality | 2019 |
| Tyneside Lettings Company Limited | Real estate | 2011 |
| Tyneside Media Solutions Ltd | Professional & scientific | 2018 |
| Tyneside Outdoors (Trading) Ltd | Wholesale & retail | 2024 |
| Tyneside Properties Ltd | Real estate | 2024 |
| Tyneside Rentals Ltd | Real estate | 2022 |
| Tyneside Roofing Ltd | Construction | 2023 |
| Tyneside Security Limited | Administrative & support | 2013 |
| Tyneside Telesales Limited | Wholesale & retail | 1996 |
| Tyneside Transport Services Limited | Real estate | 1971 |
| Tyneside Tutors Ltd | Education | 2024 |
| Tyneside Urology LLP | | 2026 |
| Tynetec Engineering Ltd | Professional & scientific | 2008 |
| Tynetech Ltd | Wholesale & retail | 2018 |
| Tynetech Repairs Ltd | Wholesale & retail | 2018 |
| Tynevale Properties Limited | Health & social care | 2019 |
| Tyneview Diagnostics Limited | Health & social care | 2012 |
| Tyneview Properties Limited | Real estate | 2015 |
| Tynexe Commercial Limited | Construction | 2016 |
| Tynexe Residential Limited | Construction | 2014 |
| Typo Investment Holdings Limited | Real estate | 2022 |
| Tyre and Puncture Repairs Limited | Wholesale & retail | 2006 |
| Tyre Coner Ltd | Wholesale & retail | 2023 |
| Tyrecalloutnearme Ltd | Wholesale & retail | 2026 |
| Tysoft Software Ltd | Information & communication | 2013 |
| Tywabricks Limited | Real estate | 2024 |
| Tywas Group Limited | Financial services | 2026 |
| U EWY Ltd | Wholesale & retail | 2020 |
| U N W Business Services Limited | Extraterritorial | 1996 |
| U WIN U Secure Ltd | Information & communication | 2024 |
| UAM Skvbsi Ltd. | Information & communication | 2023 |
| UAO Financials Ltd | Professional & scientific | 2015 |
| UAO Residential Ltd | Real estate | 2023 |
| UBC Developments Ltd | Wholesale & retail | 2023 |
| Uber Bearings Ltd | Construction | 2023 |
| Uberella Global Enterprises Ltd | Information & communication | 2024 |
| Ubisoft Reflections Limited | Information & communication | 2006 |
| Ubuntu Project Limited | Other services | 2015 |
| Uchiha Limited | Wholesale & retail | 2024 |
| Uconstruct Ltd | Manufacturing | 2016 |
| UCQ Commercial Operations Limited | Education | 2017 |
| Ucukgroup Ltd | Administrative & support | 2020 |
| UDE Engineering Ltd | Professional & scientific | 2021 |
| Ugen DX Ltd | Professional & scientific | 2024 |
| UI Locum Services Ltd | Health & social care | 2021 |
| Uinnovations Ltd | Professional & scientific | 2023 |
| UK Academy of Higher Academic Learning Ltd | Education | 2025 |
| UK Aesthetic Marketing Co Ltd | Professional & scientific | 2026 |
| UK Arches Ltd | Professional & scientific | 2017 |
| UK Barbers 17 Ltd | Other services | 2025 |
| UK Bathrooms Limited | Wholesale & retail | 2002 |
| UK Car Finance Ltd | Financial services | 2015 |
| UK Career Launchpad Ltd | Administrative & support | 2025 |
| UK Chess Events Ltd | Professional & scientific | 2020 |
| UK City Properties Ltd | Real estate | 2014 |
| UK Class Ltd | Education | 2023 |
| UK Commercial Investments Limited | Wholesale & retail | 2008 |
| UK Community Production Limited | Administrative & support | 2020 |
| UK DMA Ltd | Health & social care | 2025 |
| UK Extrusion Limited | Professional & scientific | 2015 |
| UK Ground Rent Estates (3) Limited | Real estate | 2017 |
| UK Ground Rent Estates (6) Limited | Real estate | 2016 |
| UK Ground Rent Estates Limited | Financial services | 2013 |
| UK Heat Vault Limited | Professional & scientific | 2023 |
| UK Holiday Lodge Letting Ltd | Hospitality | 2023 |
| UK Home Living Ltd | Wholesale & retail | 2022 |
| UK Horizon Ltd | Health & social care | 2015 |
| UK Housecheck Limited | Professional & scientific | 2024 |
| UK Hunter Commercial Ltd | Wholesale & retail | 2021 |
| UK Industrial Tapes Limited | Manufacturing | 1997 |
| UK Land Options Ltd | Construction | 2011 |
| UK Language Project Ltd. | Education | 2011 |
| UK Legal Group Ltd | Professional & scientific | 2000 |
| UK Living Limited | Information & communication | 2012 |
| UK Locum Doctors Limited | Other services | 2010 |
| UK Logs Direct Ltd | Wholesale & retail | 2015 |
| UK M&Cgroundworks Ltd | Construction | 2026 |
| UK Masterclean Ltd | Other services | 2007 |