| TIA the Inner Attitude CIC | Arts & recreation | 2025 |
| Tiaris Limited | Information & communication | 2016 |
| Ticket Expert Limited | Administrative & support | 2012 |
| Ticket Room Ltd | Administrative & support | 2012 |
| TID Developers Limited | Construction | 2021 |
| Tide Property Assets Ltd | Hospitality | 2022 |
| Tideway Court (NO. 1) RTM Company Limited | Households | 2003 |
| Tideway Court (NO.2) RTM Company Limited | Households | 2003 |
| Tidy Mates Ltd. | Administrative & support | 2016 |
| Tidyover Enterprises Limited | Households | 1992 |
| Tigana Shoes Limited | Wholesale & retail | 2015 |
| Tigersquiggle Ltd | Information & communication | 2025 |
| Tiktok Shopping Ltd | Wholesale & retail | 2023 |
| TIL Entertainment Limited | Hospitality | 2026 |
| TIL Investments Limited | Hospitality | 2023 |
| TIL Licence Limited | Hospitality | 2025 |
| Tile Trove Ltd | Wholesale & retail | 2019 |
| Tillfield Limited | Wholesale & retail | 1986 |
| Tillingdown Park Management Co Ltd | Households | 2019 |
| TIM Anderson Photography Limited | Professional & scientific | 2006 |
| Timber Gardens Restaurant Ltd | Manufacturing | 2012 |
| Time 2 Relax Therapy Ltd | Other services | 2024 |
| Time and Patience Care Ltd | Health & social care | 2017 |
| Time MDH Limited | Administrative & support | 2021 |
| Timelyne Entertainment Ltd | Manufacturing | 2025 |
| Timepup Ltd | Information & communication | 2025 |
| Times Place Property Services Limited | Real estate | 2014 |
| Timetarget Limited | Extraterritorial | 2015 |
| Timetarget Workforce Management Limited | Information & communication | 2014 |
| Timikivu Limited | Health & social care | 2019 |
| Timor Enterprises Limited | Wholesale & retail | 2016 |
| Timothy Wiseman Limited | Administrative & support | 2018 |
| Timpani Hill Management Limited | Real estate | 2010 |
| Timperley Flats (Services) Limited | Households | 1975 |
| Timsonscpi Limited | Manufacturing | 2021 |
| Timz Realty Ltd | Real estate | 2021 |
| TIN TIN Traders Ltd | Wholesale & retail | 2018 |
| Tina Nails EJT Limited | Other services | 2016 |
| Tinashe & Tawana Healthcare Ltd | Health & social care | 2016 |
| Tinax Texeiles Limited | Health & social care | 2016 |
| Tinfra Limited | Professional & scientific | 2025 |
| Tingey & Company Limited | Water & waste | 2006 |
| Tinkabellas Limited | Health & social care | 2026 |
| Tinker Brook Fold Management Company Limited | Households | 2004 |
| Tinsley Close Management (Deeping) Limited | Households | 2023 |
| Tinsta Limited | Information & communication | 2015 |
| Tiny Journeys Childcare Ltd | Health & social care | 2025 |
| Tiny Mart Ltd | Wholesale & retail | 2020 |
| Tinys Beauty Ltd | Other services | 2019 |
| TIP Top Fish Bar Ltd | Hospitality | 2016 |
| Tironem Staffing Limited | Administrative & support | 2020 |
| Tish Aletheia Limited | Manufacturing | 2014 |
| Tisrex Ltd | Hospitality | 2025 |
| Tissot Industry UK Limited | Construction | 2017 |
| Titan 1812 Ltd | Transport & logistics | 2018 |
| Titan Instruments Limited | Manufacturing | 2018 |
| Titan Regal Ltd | Transport & logistics | 2018 |
| Titanium Consultancy Limited | Information & communication | 2024 |
| Titans Events Ltd | Wholesale & retail | 2019 |
| Tivargia Developments Ltd | Construction | 2023 |
| TIW MANCO1 Limited | Households | 2020 |
| Tiwaris Limited | Wholesale & retail | 2014 |
| Tiyaran Catering Ltd | Hospitality | 2023 |
| Tiziana Alocci Ltd | Professional & scientific | 2018 |
| Tjbespokejoinery Ltd | Construction | 2017 |
| TJE Creative Ltd | Arts & recreation | 2026 |
| Tjhmusic Ltd | Information & communication | 2025 |
| TK Born and Raised C.I.C. | Manufacturing | 2021 |
| TK Homesuk Limited | Real estate | 2023 |
| TK Luxury Properties Ltd | Real estate | 2025 |
| TK Production Ltd | Information & communication | 2024 |
| TK Welding and Fabrication Ltd | Professional & scientific | 2026 |
| Tkat Care Ltd | Health & social care | 2025 |
| Tkess Limited | Health & social care | 2023 |
| TKS Bespoke Ltd | Construction | 2020 |
| Tkurts Ltd | Hospitality | 2021 |
| TL Certificates Limited | Households | 2021 |
| TL Creative Limited | Professional & scientific | 2024 |
| Tlaproperty Ltd | Real estate | 2025 |
| Tlas Consulting Ltd | Health & social care | 2022 |
| Tlash Limited | Construction | 2014 |
| Tlmk Ltd | Financial services | 2016 |
| TLV Kosher Falafel Ltd | Hospitality | 2025 |
| TMD Private Hire Ltd | Transport & logistics | 2025 |
| Tmdiallo Limited | Financial services | 2017 |
| TMI Builders Limited | Construction | 2008 |
| TML Precision Engineering Limited | Manufacturing | 2007 |
| TMP Cleaning Ltd | Administrative & support | 2024 |
| TMS Ventures Logistics Ltd | Transport & logistics | 2026 |
| TMT 1982 Ltd | Hospitality | 2022 |
| Tmtent Limited | Professional & scientific | 2023 |
| Tnail Boutique Ltd | Other services | 2026 |
| TNJ Transport Ltd | Transport & logistics | 2016 |
| TNK Catering Ltd | Hospitality | 2022 |
| TNT Construction Team Ltd | Construction | 2026 |
| TNV Logistics Ltd | Wholesale & retail | 2017 |
| TNV Parts UK Ltd | Wholesale & retail | 2023 |
| TNV Properties Solutions Ltd | Real estate | 2026 |
| Tobamovers Limited | Transport & logistics | 2025 |
| Tobie Limited | Construction | 2000 |