| Tees Valley Electrical Ltd | Construction | 2023 |
| Tees Valley Electrics Limited | Construction | 2024 |
| Tees Valley Estates Ltd | Real estate | 2023 |
| Tees Valley Health Limited | Health & social care | 2016 |
| Tees Valley Inclusion Project CIC | Education | 2011 |
| Tees Valley Inspections Limited | Professional & scientific | 2014 |
| Tees Valley Laboratory Services LLP | | 2022 |
| Tees Valley Land & Properties Limited | Construction | 2006 |
| Tees Valley Laundry Ltd | Other services | 2022 |
| Tees Valley Machining Ltd | Manufacturing | 2018 |
| Tees Valley Motorsport Limited | Education | 2022 |
| Tees Valley Pathology Services LLP | | 2022 |
| Tees Valley Pest Control Limited | Other services | 2018 |
| Tees Valley Psychology Limited | Other services | 2019 |
| Tees Valley Rural Action Ltd | Health & social care | 1999 |
| Tees Valley Show Ltd | Administrative & support | 2021 |
| Tees Valley Tots Limited | Health & social care | 2026 |
| Tees Valley Trailers Limited | Transport & logistics | 2004 |
| Tees Valley Windows & Conservatories Limited | Construction | 2011 |
| Tees Works Group Ltd | Construction | 2024 |
| Tees-Analytica Ltd | Information & communication | 2025 |
| Tees-Tek Limited | Professional & scientific | 2015 |
| Teesbioenergy Limited | Professional & scientific | 2022 |
| Teescomps Ltd | Wholesale & retail | 2026 |
| Teesdale House Limited | Households | 2025 |
| Teesdale Properties LLP | | 2012 |
| Teesfix UK Ltd | Administrative & support | 2017 |
| Teeside Prime Property Management Limited | Real estate | 2026 |
| Teeside Property Services Limited | Households | 2015 |
| Teeside Store Ltd | Wholesale & retail | 2025 |
| Teeside Turbines Ltd | Construction | 2026 |
| Teespen Property Holding Limited | Financial services | 2019 |
| Teesplumbing&Heating Ltd | Construction | 2024 |
| Teespro Recruitment Limited | Administrative & support | 2021 |
| Teessafe Limited | Professional & scientific | 2019 |
| Teesside Academy Ltd | Arts & recreation | 2020 |
| Teesside Aesthetics Training Ltd | Education | 2023 |
| Teesside Auto Solutions Ltd | Wholesale & retail | 2024 |
| Teesside Caravan Storage Ltd | Administrative & support | 2016 |
| Teesside Care Services Ltd | Health & social care | 2021 |
| Teesside Cleaning Ltd | Administrative & support | 2026 |
| Teesside Coating & Services Ltd | Manufacturing | 2026 |
| Teesside Commercial Cleaning Services Ltd | Administrative & support | 2020 |
| Teesside Commerical Services Ltd | Wholesale & retail | 2025 |
| Teesside Construction Ltd | Construction | 2024 |
| Teesside Container Storage Ltd | Administrative & support | 2023 |
| Teesside Contractors Accommodation Ltd | Real estate | 2019 |
| Teesside Cupping Services Ltd | Health & social care | 2020 |
| Teesside Decom Limited | Professional & scientific | 2016 |
| Teesside Driving Services Limited | Transport & logistics | 2024 |
| Teesside Electrical Contractors Ltd | Construction | 2025 |
| Teesside Empowerment Group CIC | Health & social care | 2025 |
| Teesside Enterprise Limited | Administrative & support | 2014 |
| Teesside Entertainment Group Ltd | Administrative & support | 2021 |
| Teesside Estates Limited | Real estate | 2006 |
| Teesside FF Ltd | Hospitality | 2025 |
| Teesside Fire Ltd | Public administration | 2025 |
| Teesside Food (NE) Ltd | Hospitality | 2025 |
| Teesside Foods Ltd | Hospitality | 2024 |
| Teesside Garden Supplies Limited | Wholesale & retail | 2018 |
| Teesside Gas-Elec Ltd | Construction | 2017 |
| Teesside Hackspace Ltd | Other services | 2016 |
| Teesside Hospice Care Foundation | Health & social care | 1982 |
| Teesside Hospice Enterprises Limited | Wholesale & retail | 1988 |
| Teesside Housing Solutions Ltd | Real estate | 2024 |
| Teesside IFA Limited | Financial services | 2015 |
| Teesside Inclusive Swim Club CIC | Arts & recreation | 2024 |
| Teesside Industrial Services Ltd | Construction | 2026 |
| Teesside Investments Limited | Real estate | 2021 |
| Teesside Kitchen Express Ltd | Hospitality | 2026 |
| Teesside Landscaping Services Ltd | Administrative & support | 2025 |
| Teesside LGV Training Limited | Other services | 2004 |
| Teesside Light Transport Limited | Transport & logistics | 2017 |
| Teesside Locksmith Ltd | Other services | 2023 |
| Teesside Metal Processors Ltd | Wholesale & retail | 2020 |
| Teesside Mind Limited | Health & social care | 2006 |
| Teesside Minibus Hire Ltd | Transport & logistics | 2021 |
| Teesside Motor Company Ltd | Wholesale & retail | 2021 |
| Teesside Motor House Ltd | Wholesale & retail | 2021 |
| Teesside Orthodontics Ltd | Health & social care | 2022 |
| Teesside Painter Ltd | Construction | 2021 |
| Teesside Pharmacies Ltd | Wholesale & retail | 2023 |
| Teesside Pizzeria Ltd | Hospitality | 2026 |
| Teesside Portfolio Ltd | Real estate | 2021 |
| Teesside Pram Services Ltd | Wholesale & retail | 2025 |
| Teesside Prestige Properties (UK) Ltd | Real estate | 2019 |
| Teesside Properties Group Ltd | Real estate | 2020 |
| Teesside Rental 2 Ltd | Transport & logistics | 2023 |
| Teesside Rental Limited | Administrative & support | 2023 |
| Teesside Risk Management Ltd | Financial services | 2025 |
| Teesside Running Club Ltd | Arts & recreation | 2024 |
| Teesside Sales & Lettings Ltd | Real estate | 2024 |
| Teesside Scaffolding and Netting Ltd | Construction | 2019 |
| Teesside Scaffolding Ltd | Construction | 2015 |
| Teesside Sealants Ltd | Manufacturing | 2023 |
| Teesside Services Limited | Manufacturing | 2021 |
| Teesside Solar Solutions Ltd | Construction | 2023 |
| Teesside Sports Club Limited | Education | 2023 |
| Teesside Sports Ltd | Arts & recreation | 2025 |
| Teesside Studios Ltd. | Real estate | 2019 |