| Tibmay Ltd | Transport & logistics | 2019 |
| Tibor Szalontai Ltd | Construction | 2020 |
| Tick Properties Ltd | Real estate | 2018 |
| Tickets for Good Foundation | Arts & recreation | 2017 |
| Tickets for Good Ltd | Administrative & support | 2025 |
| Ticketybooit Limited | Information & communication | 2012 |
| Tickhill Dental & Implant Centre Limited | Health & social care | 2017 |
| Tickhill Properties Limited | Real estate | 2016 |
| Ticking Clock Brewing Company Limited | Manufacturing | 2021 |
| Tictac Solutions Ltd | Information & communication | 2026 |
| Tictoc Print Ltd | Manufacturing | 2020 |
| Tidal Training Ltd | Education | 2012 |
| Tidal Ways Limited | Hospitality | 2026 |
| Tiddlywinks Centre | Education | 1999 |
| Tidecrown Limited | Real estate | 1984 |
| Tidy Teeth Ltd | Health & social care | 2025 |
| Tidzo Limited | Information & communication | 2010 |
| Tier 2 Dental Training Ltd | Education | 2019 |
| Tieron Baptiste Limited | Construction | 2020 |
| Tierraland Ltd | Real estate | 2026 |
| Tieservices Ltd | Professional & scientific | 2015 |
| Tietek.Ai Limited | Administrative & support | 2021 |
| Tiffin (S18) Ltd | Hospitality | 2019 |
| Tiger Assemblies Ltd | Manufacturing | 2018 |
| Tiger Strut | Arts & recreation | 2016 |
| Tigerandarrows Ltd | Wholesale & retail | 2025 |
| Tigerbob Limited | Hospitality | 2016 |
| Tigerfert Limited | Manufacturing | 2017 |
| Tigers Community Projects CIC | Education | 2024 |
| Tight Line Tackle & Pet Supplies Ltd | Wholesale & retail | 2020 |
| Tigoo Creative Limited | Information & communication | 2003 |
| Tikstation Ltd | Professional & scientific | 2022 |
| Tilbury Bean Books Limited | Arts & recreation | 2015 |
| Tilde Limited | Administrative & support | 2005 |
| TILES360 Limited | Wholesale & retail | 2020 |
| Tiletraders Ltd | Construction | 2017 |
| Till Point Limited | Administrative & support | 2005 |
| Tilly Turf Limited | Extraterritorial | 2010 |
| Tilly's Tea Rooms Castleton Ltd | Hospitality | 2023 |
| Tillyer Family Limited | Real estate | 2020 |
| Tillyteapot Limited | Professional & scientific | 2002 |
| Tilsam Capital Ltd | Financial services | 2022 |
| Tilsam Escapes Ltd | Hospitality | 2022 |
| TIM GOW Wealth Management Limited | Professional & scientific | 2018 |
| TIM Jones Consulting Ltd | Professional & scientific | 2022 |
| TIM Nicholls Financial Services Ltd | Financial services | 2025 |
| TIM Paton Consultancy Limited | Professional & scientific | 2020 |
| TIM Rivett Consulting Ltd | Professional & scientific | 2016 |
| TIM Shield | Professional & scientific | 2012 |
| TIM Skidmore Data Cabling Limited | Information & communication | 2016 |
| Tim's Timbertop Car Wash Ltd | Wholesale & retail | 2026 |
| Timber Tech Structures Ltd | Construction | 2013 |
| Timber Top Express Limited | Administrative & support | 2024 |
| Timberplay Ltd. | Wholesale & retail | 2000 |
| Time 4 Training Limited | Other services | 2013 |
| Time Animation Culture Co., Ltd | Wholesale & retail | 2025 |
| Time Architects Limited | Construction | 2012 |
| Time Factors International Limited | Manufacturing | 2024 |
| Time for Tea Designs Ltd | Wholesale & retail | 2021 |
| Time Studio Watches Limited | Wholesale & retail | 2019 |
| Time Travels PVT Ltd | Transport & logistics | 2023 |
| TIME2SHINE Driving School Ltd | Education | 2026 |
| Timeless House Projects Limited | Professional & scientific | 2005 |
| Timeless Investments Ltd | Real estate | 2022 |
| Timeless Tales Photography UK Limited | Arts & recreation | 2025 |
| Timeline Resources Ltd | Information & communication | 2018 |
| Timeshare Payback Ltd | Administrative & support | 2022 |
| Timeweb Limited | Information & communication | 2017 |
| Timm Cleasby Photography Limited | Professional & scientific | 2007 |
| Timm Croods Ltd | Wholesale & retail | 2025 |
| Timpar Limited | Real estate | 2014 |
| TIN Drum Music Ltd | Administrative & support | 2011 |
| TIN Drum Services Limited | Administrative & support | 2021 |
| Tina Sattarin Hair and Make UP Ltd | Other services | 2019 |
| Tinfori Ltd | Health & social care | 2020 |
| Tingle Ashmore Limited | Professional & scientific | 2003 |
| Tinglewood Consultancy Ltd | Professional & scientific | 2025 |
| Tinglewood Ltd | Real estate | 2024 |
| Tink Lite Limited | Manufacturing | 2019 |
| Tinker Tent Ltd | Education | 2019 |
| Tinker Tots Ltd | Hospitality | 2025 |
| Tinnitus UK | Other services | 1992 |
| Tino's (SY) Ltd | Hospitality | 2021 |
| Tinology Ltd | Wholesale & retail | 2020 |
| Tinop Limited | Health & social care | 2013 |
| Tinsley Bridge Group Holdings Limited | Financial services | 2023 |
| Tinsley Bridge Group Limited | Financial services | 1987 |
| Tinsley Bridge Group Management Limited | Financial services | 2025 |
| Tinsley Bridge Limited | Manufacturing | 1984 |
| Tinsley Bridge Services Limited | Manufacturing | 2009 |
| Tinsley Bridge Trustees Limited | Professional & scientific | 2017 |
| Tinsley Forum | Other services | 1999 |
| Tinsley Park Holdings Limited | Real estate | 1998 |
| Tinsley Supermarket Ltd | Wholesale & retail | 2023 |
| Tintagel House (Sheffield) Limited | Education | 1961 |
| Tinted. Education Ltd | Education | 2023 |
| Tiny Hands Big Futures Holdings Ltd | Financial services | 2025 |
| Tiny Hands Big Futures Ltd | Education | 2019 |
| Tippetts Fountains Limited | Manufacturing | 2003 |
| Tipping Dental Ltd | Health & social care | 2022 |