| Tool-Fit Limited | Extraterritorial | 2018 |
| Tools of Tech UK Ltd | Information & communication | 2026 |
| Toon Bars Ltd | Hospitality | 2025 |
| Top Barber (Askern) Limited | Other services | 2022 |
| Top Draw Building Services Ltd | Construction | 2021 |
| Top Fade Barber Limited | Other services | 2021 |
| Top Fade Conisbrough Ltd | Other services | 2023 |
| Top Gear Credit Brokers Ltd | Financial services | 2022 |
| Top Gear Vehicle Leasing Limited | Financial services | 2024 |
| Top Grade Marine Solutions Ltd | Wholesale & retail | 2025 |
| Top Harvest Limited | Agriculture & fishing | 2021 |
| Top Roofing Services Limited | Construction | 2019 |
| Top Shop Doncaster Limited | Wholesale & retail | 2025 |
| Top Tier Roofing Solutions Ltd | Construction | 2026 |
| Top-Transpo Ltd | Transport & logistics | 2021 |
| Topgear Performance (Doncaster) Ltd | Wholesale & retail | 2015 |
| Topia IT Limited | Information & communication | 2018 |
| Topline Pest Control Ltd | Agriculture & fishing | 2018 |
| Topmos Properties Ltd | Real estate | 2022 |
| Topolski Holding Limited | Professional & scientific | 2021 |
| Topolski, Stanley & Associates Ltd | Professional & scientific | 2023 |
| Topq Holding UK Ltd | Wholesale & retail | 2026 |
| Topscale Roofing Ltd | Construction | 2025 |
| Topsolve Ltd | Construction | 2020 |
| Toptrade Sourcing Limited | Wholesale & retail | 2023 |
| Topzen Limited | Real estate | 2025 |
| Torchmaster Roofing Limited | Construction | 2007 |
| Tordoff & Sons Limited | Real estate | 2012 |
| Torksey Homes Limited | Construction | 2022 |
| Tornado Pest Control Limited | Agriculture & fishing | 2019 |
| Torne & Shirmers Limited | Professional & scientific | 2009 |
| Torne Valley (Bakewell) Limited | Manufacturing | 2013 |
| Torne Valley Limited | Wholesale & retail | 1972 |
| Torson Properties Limited | Real estate | 2025 |
| Tortila HUT Ltd | Hospitality | 2022 |
| Torver Engineering Limited | Professional & scientific | 2009 |
| Torworth Lakes Limited | Hospitality | 2023 |
| Torworth Properties Limited | Construction | 2023 |
| Tosco Ltd. | Agriculture & fishing | 2017 |
| Tosh T.T. Ltd | Transport & logistics | 2014 |
| Total AOC Solutions Limited | Information & communication | 2011 |
| Total Effex Security Services Ltd | Administrative & support | 2023 |
| Total Fashion Limited | Water & waste | 1999 |
| Total Ground Solutions (Lincs) Limited | Agriculture & fishing | 2026 |
| Total Ground Solutions Limited | Construction | 2025 |
| Total Management Development Limited | Professional & scientific | 1992 |
| Total Rigging Solutions Limited | Manufacturing | 2015 |
| Total Talent Limited | Professional & scientific | 2016 |
| Total Trades Construction Ltd | Construction | 2020 |
| Total Trades Management Ltd | Construction | 2016 |
| Total Tyre Recycling Limited | Water & waste | 2010 |
| Totally Kitchens & Bathrooms Limited | Construction | 2015 |
| Totalwest Limited | Health & social care | 1997 |
| Totem Safety Ltd | Public administration | 2023 |
| Totem Trilogy CIC | Health & social care | 2022 |
| Toucan Holdings Limited | Real estate | 1997 |
| Touched by a Guardian Angel CIC | Health & social care | 2025 |
| Tough Cherry Limited | Wholesale & retail | 2023 |
| Tourney Time Network Ltd | Information & communication | 2020 |
| Tower Developments (Harrogate) Limited | Construction | 2017 |
| Tower Investments (Harrogate) Ltd | Real estate | 2021 |
| Tower Works Communications Ltd | Information & communication | 2025 |
| Town & Country Cobbler Limited | Wholesale & retail | 2001 |
| Town & Country Foods Limited | Wholesale & retail | 2016 |
| Town & Country Roads Ltd | Construction | 2020 |
| Town END Digital Ltd | Other services | 2023 |
| Town END Pizza Ltd | Hospitality | 2022 |
| Town View Property Ltd | Real estate | 2022 |
| Townhouse (Hemsworth) Limited | Hospitality | 2025 |
| Townhouse Medical Ltd | Health & social care | 2025 |
| Toycan Limited | Wholesale & retail | 2023 |
| Toys Place Limited | Wholesale & retail | 2025 |
| TQT International Ltd | Manufacturing | 2019 |
| TR Andrew Holdings Limited | Financial services | 2025 |
| TR Auto Repairs Ltd | Wholesale & retail | 2023 |
| TRA Electrical Limited | Construction | 2025 |
| Trachem Limited | Wholesale & retail | 1999 |
| Trackchain Limited | Information & communication | 2022 |
| Trackday Solutions Ltd | Arts & recreation | 2019 |
| Trackinsight Ltd | Information & communication | 2025 |
| Trackwork Group Limited | Construction | 2008 |
| Trackwork Holdings Limited | Construction | 1989 |
| Trackwork Limited | Construction | 1976 |
| Trackwork Moll Limited | Manufacturing | 2011 |
| Trackwork Resources Limited | Construction | 1982 |
| Tractoro Export Ltd | Wholesale & retail | 2010 |
| Tracy Walker Limited | Other services | 2019 |
| Tradan Developments Limited | Construction | 2025 |
| Trade Fencing Supplies Limited | Wholesale & retail | 2009 |
| Trade Jewellers Ltd | Wholesale & retail | 2013 |
| Trade Link Group Ltd | Information & communication | 2026 |
| Trade Safe Group Ltd | Administrative & support | 2026 |
| Trade Skills Ltd | Professional & scientific | 2009 |
| Trade Vans 365 Limited | Wholesale & retail | 2025 |
| Trademaster Interiors Ltd | Construction | 2016 |
| Tradetorque Ltd | Wholesale & retail | 2026 |
| Tradeway Commerce Ltd | Wholesale & retail | 2026 |
| Tradium UK Limited | Wholesale & retail | 2024 |
| Trador Marketing Limited | Administrative & support | 2004 |
| Traffic Control Ltd | Other services | 2018 |