| TI Amos (Yorkshire) Limited | Hospitality | 2024 |
| TIA Ventures Ltd | Real estate | 2025 |
| Tidy Worx Ltd | Construction | 2023 |
| Tiger Concrete Ltd | Manufacturing | 2019 |
| Tiger Fireplaces (Loughborough) Limited | Extraterritorial | 1967 |
| Tiger Hospitality Ltd | Hospitality | 2024 |
| Tikus Limited | Agriculture & fishing | 1999 |
| Tiljam Holdings Ltd | Administrative & support | 2019 |
| TIM Goodacre Enterprises Ltd | Information & communication | 2025 |
| Timberley Cars Limited | Administrative & support | 2018 |
| Timepiece Press Limited | Arts & recreation | 2021 |
| Tindle Tree Care Ltd. | Agriculture & fishing | 2014 |
| Tiny Treasures Baby Castings Ltd | Arts & recreation | 2022 |
| TIP Top Installations Ltd | Construction | 2009 |
| Tipple and Fizz Limited | Hospitality | 2017 |
| Titanium Entertainment Limited | Hospitality | 2023 |
| Titanium Race Timing Limited | Arts & recreation | 2022 |
| TJ Heating & Plumbing Services Ltd | Construction | 2024 |
| TJ Neale Holding Ltd | Financial services | 2023 |
| TJK Cars Ltd | Wholesale & retail | 2023 |
| TK Courier Service Ltd | Transport & logistics | 2014 |
| Tksa Holdings Limited | Financial services | 2022 |
| Tlhfj Limited | Financial services | 2023 |
| TMF Services Ltd | Construction | 2012 |
| Tmfn Ltd | Wholesale & retail | 2021 |
| TMS Control Engineering Limited | Administrative & support | 2015 |
| Tmxprojects Limited | Construction | 2024 |
| TMZ Accounting Limited | Professional & scientific | 2015 |
| TNP Legal Limited | Professional & scientific | 2022 |
| Tobin & Glover LLP | | 2001 |
| Tobin & Glover Surveyors Ltd | Professional & scientific | 2019 |
| Tobin Property Investments Limited | Real estate | 2020 |
| Together Alliance NFP Ltd | Other services | 2026 |
| Toguuk Ltd | Arts & recreation | 2015 |
| Tonec Supply Co Limited | Wholesale & retail | 2020 |
| Tony Robson Automotive Consultancy Ltd | Professional & scientific | 2018 |
| Tootpana Limited | Wholesale & retail | 2026 |
| Top Barber 12 Limited | Other services | 2025 |
| Top Building Control Ltd | Construction | 2014 |
| Top Cutz Loughborough Ltd | Other services | 2025 |
| Top Notch Auto Services Ltd | Wholesale & retail | 2026 |
| Top Pcdc Ltd | Financial services | 2023 |
| Top Stitch Expert Ltd. | Other services | 2026 |
| Top WOK (at) Limited | Hospitality | 2019 |
| Topmerrill Riding School Ltd | Agriculture & fishing | 2024 |
| Toria's Books Ltd | Professional & scientific | 2012 |
| Total Gardens Ltd | Administrative & support | 2025 |
| Total Graphics Solutions RF Ltd | Administrative & support | 2014 |
| Total Investments Limited | Real estate | 2019 |
| Total Mast Solutions Ltd | Professional & scientific | 2009 |
| Totem Consulting Limited | Professional & scientific | 2022 |
| Tour Glocal Limited | Information & communication | 2019 |
| Tower Sea Products Limited | Manufacturing | 1978 |
| Townley BTL Properties Limited | Real estate | 2024 |
| Townpier Limited | Hospitality | 1984 |
| TPM Property Limited | Real estate | 2018 |
| Tracey Mather Wealth Management Limited | Financial services | 2012 |
| Track Masters Motorsport Limited | Arts & recreation | 2026 |
| Tracketc Ltd | Information & communication | 2024 |
| Tracks 2000 (International) Limited | Wholesale & retail | 2005 |
| Trade Price Sofa Wholesalers Limited | Wholesale & retail | 2020 |
| Traders Specialty Ltd | Wholesale & retail | 2024 |
| Tradify (UK) Ltd | Professional & scientific | 2018 |
| Trafalgar Estate Planning Ltd | Professional & scientific | 2023 |
| Traian and Anyie Ltd. | Transport & logistics | 2014 |
| Trailsuite Ltd | Professional & scientific | 2014 |
| Trana Gyms Limited | Financial services | 2017 |
| Tranquil Plants International Limited | Wholesale & retail | 2021 |
| Trans Drive Courier Ltd | Transport & logistics | 2025 |
| Transformative Property Limited | Real estate | 2018 |
| Transhumanity Ltd | Information & communication | 2024 |
| Translingo Ltd | Professional & scientific | 2024 |
| Transparent Change CIC | Education | 2022 |
| Transport 24 Limited | Transport & logistics | 2007 |
| Trap 6 Properties Limited | Real estate | 2018 |
| Travel and Entertainment Group Limited | Financial services | 2013 |
| Trbzn T/A Limited | Hospitality | 2026 |
| TRC Enterprises Limited | Health & social care | 2014 |
| TRD Elite Properties Ltd | Real estate | 2026 |
| Treabark Ltd | Financial services | 2023 |
| Treadrock II Ltd | Construction | 2023 |
| Treadrock Ltd | Real estate | 2017 |
| Treasure Children's Home Ltd | Health & social care | 2025 |
| Trebarwith House Financial Planning Limited | Financial services | 2026 |
| Treetops (Matlock) Management Company Limited | Households | 2018 |
| Tremendum Limited | Real estate | 2017 |
| Trent Advisory Services Limited | Professional & scientific | 2015 |
| Trent Baits Dkdh Limited | Manufacturing | 2014 |
| Trent Baits Limited | Manufacturing | 2005 |
| Trevor Parr Associates Limited | Real estate | 1971 |
| Trevs Recovery Services Ltd | Transport & logistics | 2026 |
| Tri-Safe Multiple Emergency Safety Ecosystem Technology Limited | Manufacturing | 2026 |
| Tribodens Ltd | Information & communication | 2023 |
| Trifecta Innovations Ltd | Manufacturing | 2022 |
| Trigpoint Conservation & Planning Limited | Professional & scientific | 2005 |
| Trillogy Limited | Transport & logistics | 2024 |
| Trinity Street & Limetree Grove Freehold Management Ltd | Households | 2022 |
| Triple a and M Limited | Households | 2020 |
| Trivvuxo Limited | Wholesale & retail | 2026 |
| TRK Estates Ltd | Real estate | 2020 |