| THE Original Comet Ltd | Hospitality | 2024 |
| THE Orion Sound Limited | Information & communication | 2016 |
| THE Party Pantry Ltd | Hospitality | 2025 |
| THE Plough (Islington) Ltd | Real estate | 2015 |
| THE Powder Coating Centre Ltd | Manufacturing | 2022 |
| THE Rabbit Hole Barbers Ltd | Other services | 2021 |
| THE Regxperts Ltd | Wholesale & retail | 2025 |
| THE Rockscape Group Limited | Financial services | 2023 |
| THE Selborne Clinic Limited | Other services | 2025 |
| THE Shires (Lincolnshire) Limited | Hospitality | 2013 |
| THE Shires Public House (Lincolnshire) Limited | Hospitality | 2014 |
| THE Siraj Clinic Limited | Health & social care | 2024 |
| THE Stables Messingham Ltd | Hospitality | 2019 |
| THE Survive & Thrive Collective Ltd | Health & social care | 2025 |
| THE Tent Project CIC | Education | 2022 |
| THE Therapy and Wellbeing Centre Limited | Real estate | 2026 |
| THE Traditional Attire Limited | Wholesale & retail | 2025 |
| THE Traditional Attire Online Limited | Wholesale & retail | 2023 |
| THE Travancore Enterprise Ltd | Wholesale & retail | 2022 |
| THE Two Fairy Godmothers Ltd | Arts & recreation | 2024 |
| THE Unit Auto Services Ltd | Wholesale & retail | 2025 |
| THE Victoria Falls Brewing Company Ltd | Administrative & support | 2016 |
| THE Violin Academy UK Ltd | Education | 2025 |
| THE Xperts Holdings Ltd | Financial services | 2026 |
| THE Zover Inc Ltd | Manufacturing | 2021 |
| Theaker Joinery Limited | Manufacturing | 2002 |
| Theaker Property Limited | Real estate | 2006 |
| Thebreastsurgeon Limited | Health & social care | 2022 |
| Thecosmeticbreastsurgeon Limited | Health & social care | 2022 |
| Theprioryshop Ltd | Wholesale & retail | 2026 |
| Thesleeptech Limited | Health & social care | 2023 |
| Think Access (Scotland) Ltd | Construction | 2024 |
| Think Access Group Ltd | Professional & scientific | 2023 |
| Think Access Ltd | Construction | 2013 |
| Think Industrial Services Ltd | Construction | 2026 |
| Thisisit Limited | Transport & logistics | 1999 |
| Thokki Digital Ltd | Information & communication | 2022 |
| Thomas and Parnell Properties Limited | Real estate | 2021 |
| Thomas Stoner Developments Limited | Construction | 2019 |
| Thomas Stoner Estates Brigg Limited | Financial services | 2006 |
| Thomas Stoner Estates Limited | Real estate | 2020 |
| Thomas Stoner Supplies Limited | Administrative & support | 2010 |
| Thompson 1973 Limited | Extraterritorial | 2014 |
| Thompson Medical Services Ltd | Health & social care | 2010 |
| Thorncroft Search & Selection Limited | Administrative & support | 2016 |
| Thorpe Meadows Equestrian Ltd | Arts & recreation | 2017 |
| Thorpe Meadows Ltd | Agriculture & fishing | 2023 |
| Three J`S Developments Limited | Construction | 2003 |
| Through the Ages Limited | Administrative & support | 2021 |
| Tiago Santos Driving Services Limited | Transport & logistics | 2017 |
| Tilly's Treat Cupboard Limited | Wholesale & retail | 2021 |
| Tilted Limited | Information & communication | 2012 |
| TIM Smith Marketing Limited | Administrative & support | 2002 |
| TIMBER2HOMES Ltd | Manufacturing | 2017 |
| Time Car Ltd | Transport & logistics | 2020 |
| Time for a Show Ltd | Wholesale & retail | 2022 |
| Time Properties Scunthorpe Ltd | Real estate | 2020 |
| Time Transport Ltd | Transport & logistics | 2024 |
| Time Transport Service Ltd | Transport & logistics | 2023 |
| Timi Distribution Ltd | Transport & logistics | 2026 |
| Tiny Tots Store Ltd | Wholesale & retail | 2020 |
| TIO 2 Ltd | Administrative & support | 2019 |
| TJS Chicken Ltd | Hospitality | 2026 |
| TJS Measurement & Control Limited | Construction | 2003 |
| TKR Sportswear Limited | Wholesale & retail | 2021 |
| TKX Limited | Manufacturing | 2021 |
| TL Medical Consultants Ltd | Health & social care | 2023 |
| TLT Sales & Rental Services Limited | Administrative & support | 2025 |
| Tltsupplies Ltd | Wholesale & retail | 2025 |
| TMA Enterprises Ltd | Real estate | 2023 |
| Tmawa Ltd | Information & communication | 2023 |
| TMC Assets Limited | Real estate | 2005 |
| Tmfp Ltd | Households | 2018 |
| Tobbie Star Limited | Transport & logistics | 2021 |
| Tobi Produce Limited | Manufacturing | 1999 |
| Tobin Engineering Limited | Professional & scientific | 2012 |
| Togher Plant & Civils Limited | Construction | 2004 |
| Tolsa UK Limited | Manufacturing | 1996 |
| Tom-Trans TC Ltd | Transport & logistics | 2025 |
| Tommy Capital Management Ltd | Real estate | 2021 |
| Tommy's Barbers Limited | Extraterritorial | 2020 |
| Toni Express Limited | Transport & logistics | 2023 |
| Tony Conroy Limited | Real estate | 2010 |
| Top Cutz Barber Shop Ltd | Other services | 2023 |
| Top Screed Ltd | Construction | 2016 |
| Tops Pizza Express North Ltd | Hospitality | 2025 |
| Tops Pizza Scunthorpe Limited | Hospitality | 2023 |
| Torex Construction Ltd | Construction | 2024 |
| Tortoise Financial Planning Ltd | Professional & scientific | 2020 |
| Toshko Engineering Ltd | Construction | 2026 |
| Total Employment Solutions Limited | Administrative & support | 2011 |
| Total Metal Management Limited | Water & waste | 2020 |
| Totally Polished Beauty Limited | Other services | 2015 |
| Toucan Trade Ltd | Wholesale & retail | 2018 |
| Town Reinforcements Limited | Construction | 2019 |
| Towprovmr Ltd | Transport & logistics | 2026 |
| Toxic Bunny Ltd | Administrative & support | 2023 |
| TPT Joinery Limited | Construction | 2023 |
| Trade 2 Trade Scunthorpe Limited | Wholesale & retail | 2022 |
| Trade Vehicle Solutions 2024 Ltd | Wholesale & retail | 2024 |