| THE Potters Club 1951 Limited | Hospitality | 2025 |
| THE Rainstorm Season Essentials Limited | Wholesale & retail | 2024 |
| THE Real Internet Company Limited | Information & communication | 2013 |
| THE Recruitment Partnership Limited | Administrative & support | 1999 |
| THE Rising Sun (Church Gresley) Ltd | Hospitality | 2021 |
| THE Royal Oak (Harriseahead) Limited | Hospitality | 2006 |
| THE Ryles Arms Limited | Hospitality | 2010 |
| THE Salon Entrepreneur Ltd | Education | 2024 |
| THE Sanctuary Worldwide Ltd | Other services | 2017 |
| THE Severn Bore PUB Inn Ltd | Hospitality | 2021 |
| THE Shanahan Foundation Limited | Other services | 2025 |
| THE Shop on the Corner Ltd | Wholesale & retail | 2024 |
| THE Skin Group Suffolk Ltd | Other services | 2022 |
| THE Sound of Coffee Ltd | Hospitality | 2025 |
| THE Stableford Management Company Limited | Households | 2006 |
| THE Studio NE Community Interest Company | Health & social care | 2024 |
| THE Talent Labs Group International Limited | Administrative & support | 2024 |
| THE Teaching Assistant College Limited | Education | 2006 |
| THE Thistleberry Hotel Limited | Hospitality | 2019 |
| THE Tignes Chalet Company Ltd | Hospitality | 2008 |
| THE Two Necks Property Company Limited | Real estate | 2010 |
| THE UK Land Club Limited | Real estate | 2025 |
| THE Value Innovator Limited | Professional & scientific | 2013 |
| THE Vault Self Store Limited | Administrative & support | 2021 |
| THE Village Bread Shop Ltd | Hospitality | 2024 |
| THE Village Partnership Properties Ltd | Households | 2024 |
| THE Village Unisex Salon Limited | Other services | 2003 |
| THE Vine Inn Limited | Hospitality | 2016 |
| THE Water Label Company Limited | Information & communication | 2012 |
| THE Waterside Care Ltd | Health & social care | 2024 |
| THE Whale Coffee Ltd | Manufacturing | 2025 |
| THE Whale's Head Ltd | Manufacturing | 2022 |
| Thea Pharmaceuticals Limited | Wholesale & retail | 2008 |
| Thelostwanderer Ltd | Hospitality | 2022 |
| Then Tax Refunds Ltd | Professional & scientific | 2021 |
| Thermal Transfer Labelling Limited | Manufacturing | 2003 |
| Thevenin Group Ltd | Hospitality | 2025 |
| THH Products Ltd | Manufacturing | 2026 |
| Think Green Skip Hire Limited | Water & waste | 2011 |
| Think Therapy Academy Ltd | Education | 2025 |
| Think Therapy Group Ltd | Health & social care | 2025 |
| Think Timber Limited | Wholesale & retail | 2008 |
| Thinking Long-Term Ltd | Professional & scientific | 2025 |
| Third EYE Clothing Co. Ltd | Wholesale & retail | 2023 |
| Thislebury Ltd | Hospitality | 2019 |
| Thomas Muckle & Sons (Builders) Limited | Wholesale & retail | 1959 |
| Thomas O’Brien Property Services Ltd | Real estate | 2026 |
| Thompson Wright Trustees Limited | Financial services | 2015 |
| Thomson Couriers Ltd | Transport & logistics | 2015 |
| Thor Marine Engineering Limited | Professional & scientific | 2024 |
| Three Boys Express Limited | Wholesale & retail | 2021 |
| Three Eagles 1 Ltd | Hospitality | 2025 |
| Three Parks Creative Ltd | Professional & scientific | 2024 |
| Thuviran Retail Ltd | Wholesale & retail | 2024 |
| THYME2DINE Ltd | Hospitality | 2023 |
| Ticket Wizard Limited | | 2009 |
| Tierra Flavors Food Ltd | Manufacturing | 2024 |
| Tiku the Film Ltd | Information & communication | 2017 |
| TIM Bradshaw Musical Services Ltd | Arts & recreation | 2022 |
| TIM Wood Contracts Limited | Construction | 2006 |
| Tinkerbell Holdings Ltd | Real estate | 2023 |
| Titan Engineering VW Limited | Manufacturing | 2017 |
| TJ Khawaja Industrial Consultants Ltd | Professional & scientific | 2026 |
| TJF Holdings Limited | Financial services | 2025 |
| TM Deliveries Ltd | Transport & logistics | 2020 |
| TMB Associates Ltd | Information & communication | 2026 |
| TMT (North East) Ltd | Transport & logistics | 2015 |
| TMT First Limited | Manufacturing | 2006 |
| TMT Technology Group Limited | Professional & scientific | 2007 |
| TMU Limited | Information & communication | 1996 |
| TNB Trading Ltd | Wholesale & retail | 2025 |
| Todd Control Systems Ltd | Administrative & support | 2017 |
| TOH Brickwork Limited | Construction | 2016 |
| Tohs Consultancy Ltd | Professional & scientific | 2021 |
| Tollymore Developments Ltd | Real estate | 2002 |
| Tollymore Growth Capital Limited | Financial services | 2026 |
| Tonn Ruairi Ltd | Hospitality | 2023 |
| Tony Blackband Ceramics Ltd | Administrative & support | 2017 |
| Tony Hawkins Media Limited | Arts & recreation | 2014 |
| Top of the Pile Ltd | Manufacturing | 2024 |
| Topnotch Trades UK Ltd | Information & communication | 2025 |
| Tops Healthcare Limited | Wholesale & retail | 2018 |
| Torchlighters Intl CIC | Other services | 2020 |
| Total Fit Therapy Ltd | Other services | 2020 |
| Total Travel Transport UK Ltd | Transport & logistics | 2012 |
| Tour Gate International Limited | Administrative & support | 2024 |
| Town & District Trading Limited | Manufacturing | 2020 |
| Town and County Developments Limited | Construction | 2019 |
| Town Taverns Limited | Hospitality | 2005 |
| Townsend Construction Limited | Construction | 2013 |
| TPI | | 1993 |
| Tracey Pomelli Limited | Wholesale & retail | 2024 |
| Trackers&Co LLP | | 2018 |
| Traderex Limited | Wholesale & retail | 2026 |
| Tragere Ltd | Professional & scientific | 2023 |
| Tranquility HRC CIC | Education | 2023 |
| Transairvac International Limited | Wholesale & retail | 1999 |
| Travel Hive Newcastle Ltd | Real estate | 2022 |
| Travelto Ltd | Administrative & support | 2025 |
| Traxall International Limited | Administrative & support | 2015 |