| Torque Lifestyle Ltd | Wholesale & retail | 2026 |
| Torstrasse 1 Lofts Limited | Hospitality | 2009 |
| Total Bespoke Valeting Ltd | Other services | 2019 |
| Total Construction (Lincoln) Limited | Construction | 2016 |
| Total Financial Advice Ltd | Financial services | 2019 |
| Total Lincoln Ltd | Professional & scientific | 2006 |
| Total PA Ltd | Administrative & support | 2020 |
| Total Paraplanning Solutions Ltd | Financial services | 2016 |
| Total Property Maintenance Ltd | Construction | 2019 |
| Total Wholesale Supplies Ltd | Wholesale & retail | 2020 |
| Totally Entwined Group Limited | Information & communication | 2006 |
| Totolith UK Limited | Health & social care | 2019 |
| Toucann Partners Limited | Construction | 2008 |
| Touch Global (UK) Limited | Wholesale & retail | 2006 |
| Touch Global Holding Ltd | Financial services | 2017 |
| Touchstone Development Limited | Other services | 2007 |
| Toumac Ltd | Professional & scientific | 2024 |
| Tourism Solutions Ltd | Administrative & support | 2002 |
| Town & Country Law Holdings Ltd | Professional & scientific | 2018 |
| Town & Country Law Ltd | Administrative & support | 2013 |
| Town & Country Law Probate Services Ltd | Professional & scientific | 2016 |
| Towning Plastering Limited | Construction | 2000 |
| Townsend Fuller Ltd | Real estate | 2019 |
| Townsley Cranes Ltd | Construction | 2010 |
| Toyotek Ltd | Wholesale & retail | 2012 |
| TPR Construction Limited | Construction | 2023 |
| Tqlogic Limited | Administrative & support | 2025 |
| Tracyp Limited | Administrative & support | 2015 |
| Trade Circle Limited | Wholesale & retail | 2024 |
| Trade Linc Windows Ltd | Wholesale & retail | 2024 |
| Trade W D UK Ltd | Professional & scientific | 2025 |
| Tradeglaze (2016) Limited | Professional & scientific | 2016 |
| Tradeglaze (Lincoln) Limited | Manufacturing | 1995 |
| Tradeglaze Group Limited | Professional & scientific | 2015 |
| Tradesmart Group Ltd | Information & communication | 2026 |
| Tradesuk Property Services Ltd | Construction | 2026 |
| Tradezuk Ltd | Construction | 2019 |
| Traditional Floor Screeding Limited | Construction | 2020 |
| Trafalgar Court Lincoln Management Limited | Households | 2013 |
| Trailhead Research Limited | Professional & scientific | 2025 |
| Train 4 Limited | Education | 2010 |
| Tranquil Minds Counselling Ltd | Health & social care | 2025 |
| Trans DAM Ltd | Transport & logistics | 2024 |
| Trans Domino Limited | Transport & logistics | 2015 |
| Transirm Ltd | Transport & logistics | 2021 |
| Transnova Trading Limited | Hospitality | 1999 |
| Travel Centre UK Limited | Wholesale & retail | 2025 |
| Travel Chaps Limited | Administrative & support | 2022 |
| Travel Sector Property Limited | Real estate | 2000 |
| TRC Entertainments Limited | Information & communication | 2025 |
| Treatment Services Ltd | Professional & scientific | 2005 |
| Treats by J -X- Ltd | Hospitality | 2021 |
| Tredwell Ltd | Administrative & support | 2013 |
| Treetops Lincoln Ltd | Real estate | 2025 |
| Trefor.Net Limited | Professional & scientific | 2015 |
| Trendgrain Limited | Real estate | 2001 |
| Trendingcart Ltd | Wholesale & retail | 2026 |
| Trendogenics Ltd | Wholesale & retail | 2025 |
| Trent Care Network Ltd | Health & social care | 2026 |
| Trent Fishing Club Ltd | Arts & recreation | 2013 |
| Trent Galleries Ltd. | Wholesale & retail | 2017 |
| Trent Valley Developments Limited | Construction | 1993 |
| Trent Valley Line Painting Ltd | Construction | 2023 |
| Trent Valley Meats Limited | Wholesale & retail | 2014 |
| Trent View Properties Limited | Households | 1990 |
| Tres Beau Limited | Real estate | 2025 |
| Trevean (TSP Investments) Limited | Real estate | 2025 |
| Trew Holdings Ltd | Real estate | 2017 |
| Triangle Security Solutions Ltd | Administrative & support | 2024 |
| Tribe Business Events Limited | Arts & recreation | 2020 |
| Trident Recruitment Limited | Other services | 2025 |
| Trifecta Security Services Ltd | Administrative & support | 2025 |
| Triflow Solutions Ltd | Professional & scientific | 2025 |
| Triformia Ltd | Wholesale & retail | 2024 |
| Trilanco Limited | Wholesale & retail | 2010 |
| Trimmy's LLP | | 2021 |
| Trinity EYE Care Ltd | Health & social care | 2024 |
| Trinity Investments (Newark) Limited | Real estate | 2024 |
| Triple a Marine Ltd | Wholesale & retail | 2025 |
| Triple M Motorsport Limited | Arts & recreation | 2008 |
| Triple R Ventures Ltd | Information & communication | 2026 |
| Tristar Systems Limited | Information & communication | 1998 |
| Tritton House Limited | Real estate | 2016 |
| Triumphs Quality Holdings Ltd | Real estate | 2021 |
| Trivetbridge Limited | Construction | 1979 |
| Trivista Global Trade Ltd | Wholesale & retail | 2024 |
| Trollone Consulting Limited | Other services | 2018 |
| Tropper Prippin Property Limited | Real estate | 2020 |
| Trot Transport Ltd | Transport & logistics | 2020 |
| Trouville Consultancy Limited | Professional & scientific | 2016 |
| TRS Design Agency Limited | Information & communication | 2013 |
| TRS Developments Limited | Real estate | 2019 |
| True Gents Barbershop Ltd | Other services | 2024 |
| True Heroes Racing C.I.C. | Arts & recreation | 2020 |
| True Replica Media Ltd. | Arts & recreation | 2015 |
| True Window & Glass Centre Limited | Administrative & support | 2012 |
| Truekleen Limited | Administrative & support | 2012 |
| Truelove Homes Ltd | Construction | 2014 |
| Truelove Management Services LLP | | 2005 |
| Truelove Property & Construction Ltd | Construction | 1968 |