| Tiger LO Limited | Households | 2016 |
| Tiger UK Services Limited | Administrative & support | 2007 |
| Tigerbite Trading Limited | Manufacturing | 2021 |
| Tihon Construction Ltd | Manufacturing | 2025 |
| Tijara UK Ltd | Wholesale & retail | 2018 |
| Tikant Ltd | Professional & scientific | 2015 |
| Tilary Limited | Wholesale & retail | 2024 |
| Tile and Stone LAB Ltd | Wholesale & retail | 2025 |
| Tile Giant Holdings Limited | Extraterritorial | 2007 |
| Tilehaus Limited | Real estate | 2017 |
| Tiles to YOU Ltd | Wholesale & retail | 2008 |
| Tilkis Limited | Wholesale & retail | 2011 |
| Tilley Maintenance Services Ltd | Administrative & support | 2026 |
| TIM Allen Ltd | Information & communication | 1999 |
| TIM Dunkley Engineering Consultancy Limited | Professional & scientific | 2015 |
| TIM Forster Guitars Ltd | Wholesale & retail | 2020 |
| TIM Keay Design Limited | Professional & scientific | 2017 |
| TIM LEE Carpentry Limited | Construction | 2016 |
| TIM Pollard Limited | Professional & scientific | 2006 |
| TIM Stevens Automotive Services Limited | Wholesale & retail | 2024 |
| TIM Surrey Limited | Information & communication | 2016 |
| TIM Winstone Acoustic Ltd | Arts & recreation | 2024 |
| Tim&In Ltd | Manufacturing | 2024 |
| Timbavati Limited | Wholesale & retail | 2019 |
| Timber Tech Tree Services Limited | Administrative & support | 2017 |
| Time 2 EAT Ltd | Hospitality | 2008 |
| Time and More UK Ltd | Wholesale & retail | 2019 |
| Time for YOU (MK and Warks) Limited | Administrative & support | 2014 |
| Time for YOU Limited | Other services | 2001 |
| Time for YOU Northampton Ltd | Administrative & support | 2022 |
| Time Infinity Ltd | Administrative & support | 2023 |
| Timeblock Residents Management Limited | Households | 1988 |
| Timehold Limited | Information & communication | 2007 |
| Timeless Restaurant Ltd | Hospitality | 2026 |
| Timetoshine Ltd | Education | 2014 |
| Timeware Software UK Limited | Information & communication | 2008 |
| Timewarp Reclaim Limited | Wholesale & retail | 2019 |
| Timex Limited | Professional & scientific | 2000 |
| Timken Way South RTM Company Ltd | Households | 2017 |
| Timur Construct Limited | Construction | 2018 |
| TIN MAN Sales and Marketing Limited | Administrative & support | 2016 |
| Tina's Beautiful American Nails Ltd | Other services | 2017 |
| Tinadia Limited | Hospitality | 2009 |
| Tinted Apps Ltd | Information & communication | 2025 |
| Tinting Brothers Ltd | Wholesale & retail | 2019 |
| Tiny Panthers Limited | Arts & recreation | 2018 |
| Tiny Riot Ltd | Professional & scientific | 2018 |
| Tiny SIA Ltd | Water & waste | 2018 |
| Tiny Thrivers Ltd | Education | 2026 |
| Tiny Tots Play Café Ltd | Hospitality | 2026 |
| Tiny Whales Limited | Education | 2023 |
| Tinysaurus Nurseries Ltd | Health & social care | 2005 |
| TIP Training Services Limited | Other services | 2022 |
| Tip-Top Construction Ltd | Construction | 2019 |
| Tippleston Limited | Information & communication | 2015 |
| Tippletastic Ltd | Wholesale & retail | 2026 |
| Tipsy Toad Limited | Hospitality | 2023 |
| Tircol Ltd | Transport & logistics | 2022 |
| Tishansoft Limited | Information & communication | 2005 |
| Titan Atlas Limited | Information & communication | 2007 |
| Titan Demolition SE Limited | Construction | 2014 |
| Titan Packaging Limited | Administrative & support | 2020 |
| Titan Prime Limited | Wholesale & retail | 2026 |
| Titan Prime Properties Ltd | Real estate | 2025 |
| Titan Roofing and Building Limited | Construction | 2026 |
| Titandent Limited | Health & social care | 2013 |
| Titania Expert Solutions Limited | Transport & logistics | 2025 |
| Titanius Limited | Professional & scientific | 2013 |
| Titanode Limited | Professional & scientific | 2019 |
| Titto Care Services Ltd | Health & social care | 2026 |
| Titto Technologies & Solutions Ltd | Information & communication | 2026 |
| Tiveys Farm Ltd | Agriculture & fishing | 2014 |
| Tiwani Promotions Limited | Arts & recreation | 2011 |
| Tiya Consulting Limited | Information & communication | 2010 |
| Tiya Property Management Limited | Real estate | 2024 |
| TJ Driving Ltd | Transport & logistics | 2016 |
| TJ Fitting Ltd | Administrative & support | 2016 |
| TJ Marketing Services Ltd | Professional & scientific | 2020 |
| TJ Services (Wollaston) Ltd | Construction | 2019 |
| TJ Vending Limited | Hospitality | 2025 |
| TJA Solutions Ltd | Administrative & support | 2015 |
| Tjante Construction Ltd | Construction | 2024 |
| TJN Holdings Ltd | Financial services | 2019 |
| TJP Bookkeeping Ltd | Administrative & support | 2004 |
| TJR Catering Ltd | Hospitality | 2026 |
| Tjrooms Ltd | Hospitality | 2025 |
| TJS Installations Limited | Construction | 2004 |
| TJS Property and Development Limited | Real estate | 2019 |
| TJV Limited | Transport & logistics | 2018 |
| TK & Sons Properties Ltd | Real estate | 2020 |
| TKA Notary Public Limited | Professional & scientific | 2022 |
| TKE Nuclear Limited | Professional & scientific | 2013 |
| Tkgrey Security Services Ltd | Extraterritorial | 2022 |
| TKN Trans Ltd | Transport & logistics | 2021 |
| Tla-Galaxy Creative Carpentry & Joinery Ltd | Manufacturing | 2023 |
| TLC ST James Limited | Real estate | 2000 |
| TLC Youth Care Limited | Health & social care | 2015 |
| TLF Holdings Ltd | Financial services | 2023 |
| TLK Curbridge Ltd | Hospitality | 2024 |
| TLM Transport & Collect Limited | Administrative & support | 2025 |