| Toddler Play UK Limited | Hospitality | 2026 |
| Todmorr Restaurant Ltd | Hospitality | 2025 |
| Together-Zengen C.I.C. | Other services | 2025 |
| Tokendash Limited | Households | 1986 |
| Tolo Transport Ltd | Manufacturing | 2023 |
| TOM Bradshaw + Co. Ltd | Construction | 2024 |
| TOM Stockton Coaching Ltd | Education | 2023 |
| TOM Sweeney's Mental Heath Consultancy Ltd | Health & social care | 2025 |
| Tombarboys Ltd | Hospitality | 2025 |
| Tomo's Cakes Ltd | Wholesale & retail | 2025 |
| Tomsec International Limited | Wholesale & retail | 2025 |
| Toned Fitness Limited | Arts & recreation | 2018 |
| Tonks Plumbing & Heating Limited | Construction | 2026 |
| Tony Casagrande (Hydraulic Systems) Limited | Manufacturing | 2002 |
| Tony Orrow Relocation Specialist Ltd | Transport & logistics | 2025 |
| Tony Slater Plasterers Limited | Construction | 2003 |
| Tony Walker Decorators Ltd | Construction | 2014 |
| Tony's Nails & Beauty Ltd | Other services | 2026 |
| Tool Maniac Limited | Wholesale & retail | 2018 |
| Tools and Plant Ltd | Wholesale & retail | 2025 |
| Toor Endo Limited | Health & social care | 2022 |
| Tooth Express Ltd | Health & social care | 2007 |
| Top Brassware Limited | Administrative & support | 1981 |
| Top Butcher & Fresh Fish Ltd | Wholesale & retail | 2021 |
| Top Cuts Gents (UK) Limited | Other services | 2022 |
| Top G Records Ltd | Information & communication | 2024 |
| Top Play Enterprises (BH) Ltd | Real estate | 2025 |
| Top Play Enterprises (BW) Ltd | Real estate | 2025 |
| Top Play Enterprises (HC) Limited | Real estate | 2025 |
| Top Play Enterprises (MEX) Ltd | Real estate | 2025 |
| Top Play Enterprises Ltd | Real estate | 2024 |
| Top Pool and Spa Services Ltd | Administrative & support | 2017 |
| Top Shop Maltby Limited | Wholesale & retail | 2025 |
| Top Spot Snooker Club Limited(The) | Arts & recreation | 1980 |
| Top Square Ltd | Wholesale & retail | 2020 |
| Top Tier Tackle Ltd | Wholesale & retail | 2025 |
| Topg Security Ltd | Administrative & support | 2025 |
| Toqeer Ashraf Ltd | Health & social care | 2018 |
| Torjen Developments Limited | Construction | 2018 |
| Tornasol UK Ltd | Other services | 2023 |
| Torne Properties Limited | Real estate | 2017 |
| Toro Veloce Investments Limited | Real estate | 2024 |
| Torqx Industries Ltd. | Information & communication | 2019 |
| TOS Rotherham Ltd | Health & social care | 2019 |
| Tosca Property Ltd | Real estate | 2021 |
| Tosek Consulting Ltd | Information & communication | 2025 |
| Toshmeister Ltd | Real estate | 2022 |
| Total Extraction Solutions Holdings Ltd | Financial services | 2021 |
| Total Extraction Solutions Limited | Construction | 2003 |
| Total Office Partitions Ltd | Construction | 2014 |
| Total Rebuild Gym Limited | Arts & recreation | 2018 |
| Total Rebuild Nutrition and Clothing Ltd | Arts & recreation | 2023 |
| Total Vibes Limited | Transport & logistics | 2019 |
| Totalherbal Ltd | Wholesale & retail | 2021 |
| Totally Fixed Ltd | Construction | 2024 |
| Touching Wood Limited | Manufacturing | 2025 |
| Tovia Limited | Construction | 2007 |
| Tower Designs UK Limited | Arts & recreation | 1992 |
| Towing Centres (U.K.) Limited | Wholesale & retail | 1999 |
| Town & County Engineering Services Limited | Wholesale & retail | 1986 |
| Town Street 1969 Limited | Extraterritorial | 2015 |
| Town Trading Limited | Construction | 2009 |
| Townsend Real Estate Ltd | Real estate | 2018 |
| Tozzin Creations Limited | Other services | 2024 |
| TPD Environmental Services Limited | Other services | 2015 |
| Tpsm Limited | Wholesale & retail | 2026 |
| TPV (UK Holdings) Limited | Financial services | 2022 |
| Tracey ANP Ltd | Health & social care | 2023 |
| Track Tech Services Limited | Wholesale & retail | 2021 |
| TRACKMASTER33 Ltd | Construction | 2025 |
| Trackmymachines Ltd | Information & communication | 2023 |
| Trade & Save Imports Limited | Wholesale & retail | 2005 |
| Trade Mark Building (Mexborough) Limited | Construction | 2014 |
| Trade Window Centre Limited | Manufacturing | 2022 |
| Tradingukonline Ltd | Wholesale & retail | 2021 |
| Traditional Hand Engraving Limited | Arts & recreation | 2014 |
| Traffic Partner Limited | Information & communication | 2015 |
| Trailblazer Allstars Ltd | Arts & recreation | 2026 |
| Tralden Limited | Professional & scientific | 2025 |
| Tramazone Ltd | Wholesale & retail | 2021 |
| Trans-Lite Europe Ltd | Professional & scientific | 2014 |
| Trans.Mina Limited | Transport & logistics | 2016 |
| Transport and Logistics Staff Ltd | Administrative & support | 2008 |
| Travel EAT Adventure Limited | Wholesale & retail | 2026 |
| Travel With Joy Private Hire Ltd | Transport & logistics | 2024 |
| Travwick Limited | Other services | 2023 |
| Trawlers Fisheries Ltd | Hospitality | 2022 |
| TRC Private Limited | Health & social care | 2022 |
| Treats N Squeaks Limited | Wholesale & retail | 2026 |
| Tred Transport Ltd | Transport & logistics | 2021 |
| Treesmart Ltd | Financial services | 2023 |
| Treeton Grange Limited | Health & social care | 1997 |
| Treeton Miners' Welfare Institute Scheme Social Club Limited | Hospitality | 1992 |
| Treeton Pizza Limited | Hospitality | 2023 |
| Treeton Walling Limited | Construction | 2016 |
| Treeton Welfare Cricket and Football Club Limited | Arts & recreation | 2012 |
| Trenchless Boring Services Ltd | Construction | 2015 |
| Trend Toys UK Ltd | Manufacturing | 2023 |
| Trendcart Ltd | Wholesale & retail | 2025 |
| Trendlord Financial Limited | Financial services | 1987 |