| THE Hospitality GUY UK Ltd | Professional & scientific | 2026 |
| THE Hous of Hair Ltd | Other services | 2017 |
| THE Inns 520 Ltd | Hospitality | 2025 |
| THE Iron Graft Ltd | Wholesale & retail | 2022 |
| THE J M Practice Limited | Professional & scientific | 2001 |
| THE JOB Office Limited | Administrative & support | 2004 |
| THE Keep Clinic Limited | Health & social care | 2020 |
| THE King's School | Education | 2011 |
| THE Lincolnshire Drizzle Company Ltd | Manufacturing | 2012 |
| THE M Word (Emotional Problem Solving) C.I.C. | Health & social care | 2019 |
| THE Manthorpe Firewood Company Limited | Wholesale & retail | 2020 |
| THE Metis Group Limited | Professional & scientific | 1995 |
| THE Nordic Way Limited | Wholesale & retail | 2025 |
| THE Old Barn Partners LLP | | 2012 |
| THE Old Coach House Store Ltd | Wholesale & retail | 2024 |
| THE Orange Lollipop Limited | Transport & logistics | 2019 |
| THE Orangery Room Limited | Construction | 2025 |
| THE Outdoor Living Collective Limited | Wholesale & retail | 2025 |
| THE Paisley Group Limited | Wholesale & retail | 2022 |
| THE PAW Lounge Ltd | Other services | 2025 |
| THE Pickled PIG (Grantham) Ltd | Wholesale & retail | 2025 |
| THE Pint-Size PUB Co Ltd | Hospitality | 2004 |
| THE POD Couple Limited | Manufacturing | 2024 |
| THE PPE Directory Ltd | Professional & scientific | 2020 |
| THE Reading Room Ltd | Wholesale & retail | 2025 |
| THE Red House Grantham | | 2002 |
| THE Red House Hotel (Grantham) Limited | Hospitality | 2003 |
| THE Red Lion (Newton) Limited | Real estate | 1989 |
| THE Royal Lancers and Nottinghamshire Yeomanry Museum Limited | Arts & recreation | 2010 |
| THE Saffron Emporium Limited | Wholesale & retail | 2025 |
| THE Serenity Care Company Limited | Health & social care | 2013 |
| THE Student and Graduate Homes Company Limited | Real estate | 1998 |
| THE Top Cutt Limited | Other services | 2023 |
| THE Trickling TAP Ltd | Wholesale & retail | 2013 |
| THE Two Lion's Trucks Ltd | Manufacturing | 2017 |
| THE Virtual Training Team Limited | Professional & scientific | 2017 |
| THE Way Studios Ltd | Information & communication | 2020 |
| THE Wedding Collection Events Ltd | Administrative & support | 2017 |
| THE Whistle Stop Micro PUB Ltd | Hospitality | 2021 |
| THE White Paper Conference Co Limited | Administrative & support | 1999 |
| THE Willbrook Group Limited | Professional & scientific | 2012 |
| THE Woodhouse Arms Limited | Hospitality | 2024 |
| THE Young Actors Academy Ltd | Arts & recreation | 2026 |
| Themagiccottage Ltd | Wholesale & retail | 2025 |
| Themed Creative Ltd | Arts & recreation | 2025 |
| Therubygroup Ltd | Real estate | 2010 |
| Thess Share Ltd | Administrative & support | 2025 |
| Thestableteam Ltd | Administrative & support | 2024 |
| Thilagam Limited | Wholesale & retail | 2026 |
| Think Principia Ltd | Information & communication | 2025 |
| Thistleton Property Ltd | Construction | 2026 |
| Thompson Partnership Education Consultants Ltd. | Real estate | 2022 |
| Thor Foods Limited | Wholesale & retail | 1983 |
| Thorn Risk Ventures LLP | | 2006 |
| Three Shires Ecology and Environment Ltd | Administrative & support | 2020 |
| Thundermonkey Software Ltd | Extraterritorial | 2010 |
| Thurledown Capital Limited | Financial services | 2015 |
| Thurledown LLP | | 2010 |
| Thurtene Holdings Ltd | Financial services | 2018 |
| Tidy Gardens & Grounds Maintenance Ltd | Administrative & support | 2021 |
| Tiger Entertainment Ltd | Arts & recreation | 2024 |
| Tilia Capital LLP | | 2006 |
| Tillers Turf Company Limited | Agriculture & fishing | 1989 |
| Tillon Limited | Professional & scientific | 2021 |
| Tilly's OFF Lead Play Park Ltd | Agriculture & fishing | 2021 |
| Timbershore 2011 LLP | | 2009 |
| Time for YOU (Derbyshire North) Ltd | Administrative & support | 2020 |
| Time to Delegate Ltd | Professional & scientific | 2024 |
| TIME4CARE Ltd | Health & social care | 2021 |
| Timesavers Cleaning Services Ltd | Administrative & support | 2017 |
| Timy Ltd | Transport & logistics | 2018 |
| Tinderbox Consulting Ltd | Administrative & support | 2003 |
| Tinel Ltd | Hospitality | 2019 |
| Tiny Tots Underwriting LLP | | 2008 |
| TJ Equity Partners Ltd | Financial services | 2025 |
| TJC Estates Limited | Real estate | 2021 |
| TL Communications Ltd | Information & communication | 2023 |
| TM Records Ltd | Manufacturing | 2020 |
| Tmbwhiteswan Ltd | Hospitality | 2026 |
| TMS (Publications) Limited | Administrative & support | 1991 |
| TMS Support Solutions Limited | Professional & scientific | 2003 |
| Toat Capital Limited | Financial services | 2020 |
| Todays News (PVT) Ltd | Wholesale & retail | 2024 |
| Together Bridal Ltd | Wholesale & retail | 2021 |
| Togro Ltd | Information & communication | 2025 |
| TOM Bellamy Creative Ltd | Professional & scientific | 2025 |
| TOM Lane Ltd | Wholesale & retail | 2014 |
| Tominda Ltd | Construction | 2023 |
| Tonebond Limited | Arts & recreation | 2009 |
| Tony Bostock Ltd | Professional & scientific | 2026 |
| Tony Crowther Consultancy Ltd | Professional & scientific | 2018 |
| Tony Ruby Exquisite Homes Limited | Real estate | 2021 |
| Toomey Limited | Administrative & support | 2013 |
| Top Barber Cuts Ltd | Other services | 2025 |
| Top Chef (Denton) Ltd | Hospitality | 2023 |
| Top Dog Distribution Limited | Extraterritorial | 1999 |
| Top Gear Car Repair Ltd | Wholesale & retail | 2016 |
| Top Nails Grantham Ltd | Other services | 2023 |
| Top Tape Ltd | Wholesale & retail | 2023 |
| Torr Waterfield Limited | Professional & scientific | 2000 |