| Tadhg & Co. Limited | Wholesale & retail | 2020 |
| Tailored 4U Ltd | Education | 2026 |
| Tak-Tec Solutions Ltd | Wholesale & retail | 2018 |
| TAL Healthcare Ltd | Health & social care | 2025 |
| Talent Force Recruit Limited | Administrative & support | 2025 |
| Talented Mavericks Limited | Information & communication | 2003 |
| Talk Trading Limited | Information & communication | 2006 |
| Tanac Ltd | Health & social care | 2024 |
| Tandoori Takeway Limited | Hospitality | 2024 |
| Tanka Bean Limited | Manufacturing | 2017 |
| Tanners Lane (Corby) Ltd | Other services | 2022 |
| Tantu Solutions Limited | Real estate | 2023 |
| Tapoi Construction Ltd | Construction | 2025 |
| Taproom Tours Limited | Hospitality | 2023 |
| Tara Beauty Therapy Ltd | Other services | 2023 |
| Tara Massage Therapy Ltd | Other services | 2024 |
| Tara Nail Therapy Ltd | Other services | 2025 |
| Tarzanian Limited | Transport & logistics | 2025 |
| TAS Trans Ltd | Administrative & support | 2017 |
| Tasknous Ltd | Information & communication | 2026 |
| Tatiana Nails Ltd | Other services | 2025 |
| Tax Simple Ltd | Professional & scientific | 2017 |
| Taylorsurgery Limited | Health & social care | 2011 |
| Tayto Group (Brands) Limited | Professional & scientific | 2009 |
| Tayto Group (Jonathan Crisp) Limited | Manufacturing | 2008 |
| Tayto Group (Manufacturing) Limited | Manufacturing | 2008 |
| Tayto Group Limited | Manufacturing | 2008 |
| Tazored Limited | Transport & logistics | 2024 |
| Tbpp Ltd | Extraterritorial | 2024 |
| TC Auto Logistics Ltd | Transport & logistics | 2022 |
| TD Removals Limited | Transport & logistics | 2015 |
| TDK Kuczik Limited | Wholesale & retail | 2022 |
| Teamfridge Holdings Limited | Financial services | 2026 |
| Teamwork Sports & Trophy Centre Limited | Wholesale & retail | 2007 |
| Tech EV Engineering Ltd | Manufacturing | 2023 |
| Tech Recruitment UK Limited | Administrative & support | 2024 |
| Technic Homes Limited | Real estate | 2006 |
| Technical Consumer Products Limited | Wholesale & retail | 2009 |
| Technicolour Spraying Ltd | Construction | 2022 |
| Technifast Ltd. | Manufacturing | 1990 |
| Technology Unlocked Ltd | Professional & scientific | 2021 |
| Teddy Vehicle and Transport Ltd | Wholesale & retail | 2018 |
| Teeola’S Care Limited | Health & social care | 2023 |
| Tego Construction Limited | Construction | 2024 |
| Tehos-Motors Ltd | Wholesale & retail | 2018 |
| TEL Business Solution Ltd | Information & communication | 2018 |
| Telco IT Service Ltd | Information & communication | 2024 |
| Teleo Healthcare Ltd | Health & social care | 2025 |
| Teletin Ltd | Wholesale & retail | 2024 |
| Temgel Ltd | Administrative & support | 2025 |
| Temporary Dedicated Solutions Ltd | Administrative & support | 2018 |
| Temporary Driving Solutions Ltd | Administrative & support | 2015 |
| Tenacity TLC Limited | Health & social care | 2013 |
| Tender CARE4U Ltd | Health & social care | 2020 |
| Tenen UK Limited | Wholesale & retail | 2005 |
| Tennis Court Maintenance Ltd | Households | 2003 |
| Tentz Group Limited | Real estate | 2024 |
| Tenvit Ltd | Administrative & support | 2015 |
| TEO Logistic Ltd | Transport & logistics | 2018 |
| Teq-Pro Ltd | Wholesale & retail | 2023 |
| Teqpro Customising Products Ltd | Wholesale & retail | 2023 |
| Tera Logistic Ltd | Transport & logistics | 2024 |
| Teranova Estate Limited | Real estate | 2025 |
| Test Booking Services Online Ltd | Education | 2019 |
| Testograph UK Ltd | Wholesale & retail | 2026 |
| Tetraprecinct Limited | Wholesale & retail | 2026 |
| Tevat Ltd | Wholesale & retail | 2025 |
| TGA Detailing Ltd | Manufacturing | 2025 |
| Thaddea Lock Pickleball and Events Limited | Arts & recreation | 2023 |
| That Letting Place Ltd | Real estate | 2020 |
| That Studio Ltd | Other services | 2019 |
| Thaxted Pharmacy Limited | Wholesale & retail | 2023 |
| THD Tanning Ltd | Administrative & support | 2023 |
| THE 4SHAW Group Ltd | Financial services | 2023 |
| THE Aligned Practice Ltd | Professional & scientific | 2026 |
| THE Attic Edit Ltd | Wholesale & retail | 2025 |
| THE Aurora Ceres Partnership Ltd | Hospitality | 2015 |
| THE Autumn Centre Ltd | Other services | 2005 |
| THE Becoming Room CIC | Education | 2026 |
| THE Beehive Inn Limited | Hospitality | 2013 |
| THE Black Metal Company Limited | Manufacturing | 2021 |
| THE Blinds Outlet Ltd | Manufacturing | 2018 |
| THE Blue Zone Club CIC | Education | 2026 |
| THE Boxing Shed Ltd | Arts & recreation | 2021 |
| THE Brooke Group Care-Homes Ltd | Health & social care | 2026 |
| THE Brooke Group Homes Ltd | Real estate | 2022 |
| THE Business Board Network Limited | Professional & scientific | 2014 |
| THE Cali LAB Ltd | Arts & recreation | 2024 |
| THE Cave Gym Limited | Arts & recreation | 2017 |
| THE Cctv Training Academy Ltd | Administrative & support | 2008 |
| THE Charity Payroll Service Limited | Administrative & support | 1996 |
| THE Chartered Institute of Logistics and Transport in the UK | Other services | 1991 |
| THE Chef Corby Limited | Hospitality | 2025 |
| THE Chosen FEW Management Ltd | Wholesale & retail | 2020 |
| THE Cleaner 101 Ltd | Administrative & support | 2026 |
| THE Club House Corby Limited | Hospitality | 2023 |
| THE Coatings Company Spray Specialists Limited | Construction | 2021 |
| THE Corby Mall Limited | Real estate | 2014 |
| THE Craft Cabin Studio Ltd | Wholesale & retail | 2025 |
| THE Crown Davidson Ltd | Education | 2022 |