| Tbs-Build Ltd | Construction | 2026 |
| TCS Scunthorpe Ltd | Wholesale & retail | 2018 |
| Techcommintz Ltd | Information & communication | 2017 |
| Technicolour Powder Coat Ltd | Manufacturing | 2022 |
| Technosys Packaging Engineering Services Limited | Manufacturing | 1999 |
| Teconnex Limited | Manufacturing | 1979 |
| TELE2MARKET Limited | Administrative & support | 2018 |
| Terra Neutral Electrical Services Ltd | Construction | 2021 |
| Terrace House Management Limited | Households | 2002 |
| TFI Global Ltd | Financial services | 2024 |
| Tgsm 2015 Ltd | Other services | 2015 |
| TH Wheel Refurbishment Ltd | Wholesale & retail | 2026 |
| THE Plassey & Gibraltar Road Management Company Limited | Households | 1995 |
| THE Academy of the Wolf Ltd | Arts & recreation | 2022 |
| THE Agency Group (UK) Limited | Information & communication | 1999 |
| THE Alana Health Group Ltd | Health & social care | 2023 |
| THE Arbour Florists Limited | Wholesale & retail | 2003 |
| THE Arch Car Company Limited | Wholesale & retail | 2015 |
| THE Barkin Lounge Ltd | Other services | 2021 |
| THE Binocular Vision Clinic Ltd | Health & social care | 2025 |
| THE Blush Group (Gainsborough) Ltd | Wholesale & retail | 2026 |
| THE Blush Group Ltd | Wholesale & retail | 2019 |
| THE Celebration Hub Limited | Hospitality | 2026 |
| THE Clinical Neuropsychology Practice Ltd | Health & social care | 2025 |
| THE Collective Beauty Room Ltd | Other services | 2025 |
| THE Doghouse Pet Shop & Aquatics Ltd | Wholesale & retail | 2020 |
| THE Export VET Limited | Professional & scientific | 2026 |
| THE Family Coffee Bean Company Limited | Hospitality | 2019 |
| THE Ferry House Limited | Hospitality | 2010 |
| THE Fitness Lady Ltd | Arts & recreation | 2023 |
| THE Forum Practice Limited | Health & social care | 2011 |
| THE George Kirton Limited | Hospitality | 2018 |
| THE Great British Bulb Company Ltd | Wholesale & retail | 2020 |
| THE Handy Locksmith Limited | Other services | 2022 |
| THE Heal'M Practice Ltd | Other services | 2017 |
| THE Hill Organization Limited | Professional & scientific | 2016 |
| THE Ingram Arms (Laughton) Limited | Hospitality | 2020 |
| THE Inner Acorn CIC | Health & social care | 2025 |
| THE Matharoo Group Limited | Other services | 2022 |
| THE Meat Storr Ltd | Wholesale & retail | 2018 |
| THE Modern Improvements Group Ltd | Construction | 2023 |
| THE North Street Carwash Ltd | Administrative & support | 2025 |
| THE Old Butchers Bistro Limited | Hospitality | 2022 |
| THE Parkes Ireland Partnership Limited | Professional & scientific | 2017 |
| THE Plural Health Care Limited | Administrative & support | 2022 |
| THE POM Lady Ltd | Agriculture & fishing | 2025 |
| THE Red Lion (Redbourne) Limited | Hospitality | 2019 |
| THE Red Lion Revesby Ltd | Hospitality | 2024 |
| THE Savvy Food Shed Ltd | Hospitality | 2018 |
| THE Sherwood Shop Ltd | Wholesale & retail | 2020 |
| THE Stags Head Knaith Park Limited | Hospitality | 2025 |
| THE Supernova Dinghy Class Limited | Arts & recreation | 2026 |
| THE Tea Lounge Ltd | Hospitality | 2026 |
| THE Throttle Shed Ltd | Wholesale & retail | 2023 |
| THE Treehouse General Trading Company Limited | Real estate | 2000 |
| THE Whole Package Limited | Transport & logistics | 2022 |
| Theakston Bronze Limited | Manufacturing | 2016 |
| Thebeckettsinn Ltd | Hospitality | 2025 |
| Theobald KBB Ltd | Construction | 2026 |
| Therawork Ltd | Administrative & support | 2022 |
| Thewlis Property Group Ltd | Real estate | 2024 |
| Third Reel Film Productions Limited | Information & communication | 2022 |
| Thomas Rose Limited | Professional & scientific | 2018 |
| Thompson & Slack Limited | Wholesale & retail | 2014 |
| Thornfield 001 Limited | Energy | 2015 |
| Thornton Mech Services Ltd | Professional & scientific | 2024 |
| Thorpe Building Services Limited | Construction | 2020 |
| Thriving With Neurodiversity Ltd | Health & social care | 2021 |
| Tillside Limited | Financial services | 2022 |
| TIM Clark Limited | Real estate | 1997 |
| TIM Daniels Consultancy Limited | Administrative & support | 2010 |
| TIM Rees & SON Window Cleaning Limited | Administrative & support | 2015 |
| TIM Rice Flooring Contractors Ltd | Construction | 2011 |
| TIM W Wells Ltd | Agriculture & fishing | 2015 |
| Timra Limited | Professional & scientific | 2019 |
| Tiny JOE Ltd | Wholesale & retail | 2024 |
| TIP TAP & Top Ltd | Manufacturing | 2016 |
| Title & Thread Ltd | Real estate | 2026 |
| TJP Accounts Services Ltd | Professional & scientific | 2023 |
| TL Thompson Services Ltd | Other services | 2022 |
| TNY Electrical Limited | Other services | 2022 |
| Toby Betts Property Limited | Real estate | 2025 |
| Together in Care Forensic Limited | Health & social care | 2013 |
| Tokk Limited | Administrative & support | 2018 |
| TOM Clixby Ltd | Transport & logistics | 2014 |
| TOM Jellinek Ltd | Construction | 2018 |
| TOM Malam Electrical Limited | Construction | 2018 |
| Tony Ellis Limited | Construction | 2002 |
| Tony Goodsir Commercial Engineers Limited | Wholesale & retail | 2001 |
| Tony Gray Contracting Ltd | Administrative & support | 2024 |
| Toolmakers Ltd | Professional & scientific | 2006 |
| Topp Retail Ltd | Wholesale & retail | 2019 |
| Total Creative Studios Ltd | Information & communication | 2023 |
| Total Heat & Energy Ltd | Construction | 2026 |
| Town and Country Beauty Clinic Limited | Other services | 1998 |
| Townsley Trading Limited | Wholesale & retail | 2015 |
| TR Home and Garden Solutions Limited | Wholesale & retail | 2024 |
| TRACKS4HACKS Ltd | Information & communication | 2022 |
| Trade Investigation Services Ltd | Professional & scientific | 2018 |
| Trade Supplies 4 Less Limited | Extraterritorial | 2019 |