| T Franklin Services Limited | Professional & scientific | 2011 |
| T J Fryer Developments Ltd | Construction | 2024 |
| T K Investments & Developers Limited | Real estate | 2024 |
| T Marjoram Spine Ltd | Health & social care | 2022 |
| T N Haulage Ltd | Transport & logistics | 2019 |
| T Owczarek Ltd | Manufacturing | 2017 |
| T P Hamer Properties Ltd | Real estate | 2024 |
| T Quincey Plumbing & Heating Limited | Construction | 2009 |
| T R Holmes Holdings Limited | Financial services | 2022 |
| T&B Couriers Ltd | Transport & logistics | 2024 |
| T&B Plastering Ltd | Construction | 2021 |
| T&Cl Holdings Limited | Administrative & support | 2017 |
| T. Chesser Limited | Health & social care | 2006 |
| T.E.A.M.S (Lincoln) Ltd | Other services | 2008 |
| T.G.Gilbert(Walcot)Limited | Agriculture & fishing | 1957 |
| T.I.Lamont Ltd | Information & communication | 2020 |
| T.J.S. Tree Services Limited | Agriculture & fishing | 2009 |
| T.Mck Plastering Ltd | Construction | 2025 |
| T.R. Holmes (Farms) Limited | Agriculture & fishing | 1977 |
| T.R. Jones Builders Limited | Construction | 2003 |
| T.R.I.M Group Ltd | Manufacturing | 2018 |
| T.R.Weston & SON Limited | Manufacturing | 1999 |
| T3 NVQ Ltd | Education | 2008 |
| T8 Business Services Ltd | Other services | 2012 |
| Tadoma Ltd | Transport & logistics | 2023 |
| Tadreeb Training Solutions Limited | Information & communication | 2022 |
| TAG Agri Contracting Ltd | Agriculture & fishing | 2021 |
| Tailored Construction Services Ltd | Construction | 2025 |
| Taisepi Venancio Limited | Health & social care | 2018 |
| TAK Zone Limited | Wholesale & retail | 2023 |
| Takj Ltd | Real estate | 2021 |
| Talent Atelier Ltd | Administrative & support | 2015 |
| Talent Matters Consulting Limited | Administrative & support | 2015 |
| Talha Iqbal Ltd | Wholesale & retail | 2025 |
| Tally Accounting Services Limited | Professional & scientific | 2020 |
| Taming Canines Limited | Arts & recreation | 2020 |
| Tammy's Ideal Laundry Solutions Ltd | Other services | 2023 |
| Tamulet Group Ltd | Real estate | 2020 |
| TAN & Tonic Ltd | Other services | 2026 |
| TAN and Witt Ltd | Health & social care | 2023 |
| TAN Lincoln Limited | Other services | 2025 |
| TAN Lines Lincs Ltd | Other services | 2024 |
| Tang Cuisine Limited | Hospitality | 2025 |
| Tanger Holding Ltd | Professional & scientific | 2019 |
| Tangerine Sage Limited | Professional & scientific | 2023 |
| Tanglenami Creations Ltd | Wholesale & retail | 2024 |
| Tanglewood SPV Limited | Construction | 2014 |
| Tankspan Leasing Limited | Administrative & support | 1998 |
| Tanners Lane Limited | Construction | 2020 |
| Taranis Defence Ltd | Professional & scientific | 2024 |
| Tarf Solutions Ltd | Information & communication | 2024 |
| Tarka Transport Ltd | Transport & logistics | 2024 |
| Task Based Engineering Services Limited | Professional & scientific | 2023 |
| Tasproco Limited | Real estate | 2007 |
| Tasslock Lincoln Ltd | Wholesale & retail | 2025 |
| Tatarata Property Ltd | Real estate | 2021 |
| Tattershall and Skegness Bars Ltd | Hospitality | 2019 |
| Tattershall Farm Park Limited | Arts & recreation | 2014 |
| Tattershall Kart Centre Limited | Arts & recreation | 2009 |
| Tattershall MOT Centre Ltd | Wholesale & retail | 2024 |
| Tattershall Tennis Club Ltd | Arts & recreation | 2026 |
| Tattoooed Tech Media Limited | Information & communication | 2024 |
| Taurus HR Solutions Ltd | Administrative & support | 2022 |
| Tax Adjusters LLP | | 2007 |
| Tax Nerd Accountants Limited | Professional & scientific | 2025 |
| Taxlinc Limited | Professional & scientific | 2019 |
| Taxmaster Solutions Ltd | Professional & scientific | 2007 |
| Taylor Bros. (Lincoln) Limited | Construction | 1950 |
| Taylor Brown Humber Ltd | Wholesale & retail | 2025 |
| Taylor Lindsey Holdings Limited | Real estate | 1999 |
| Taylor Lindsey Limited | Construction | 1953 |
| Taylor Lindsey Racing Limited | Arts & recreation | 2013 |
| Taylor Lynch Building Services Limited | Construction | 2020 |
| Taylor Made Arts Ltd | Arts & recreation | 2021 |
| Taylor Retford Ltd | Extraterritorial | 2026 |
| Taylor Ross Ltd | Real estate | 2024 |
| Taylor VTS Consultancy Ltd | Education | 2020 |
| Taylor'D Hair Boutique Limited | Other services | 2017 |
| Taylor's Autos Motor Engineers Ltd | Wholesale & retail | 2019 |
| Taylormade Information Security Ltd | Information & communication | 2016 |
| Taylormade Rentals Limited | Real estate | 2026 |
| Taylors Yard Property Management Company Ltd | Real estate | 2020 |
| TB Controls Ltd | Information & communication | 2023 |
| TB Graphics Limited | Professional & scientific | 2021 |
| TB Tech Services Ltd | Professional & scientific | 2022 |
| Tbrs Properties Limited | Real estate | 2022 |
| Tbzs Trans Ltd | Transport & logistics | 2025 |
| TCF Group Holdings Ltd | Financial services | 2023 |
| TCF Group Ltd | Financial services | 2020 |
| TCF Property Holdings Limited | Construction | 2026 |
| TCL Corporation Limited | Professional & scientific | 2018 |
| TCL Solar Ltd | Wholesale & retail | 2014 |
| TCL Training Limited | Education | 2017 |
| TD Pipeline Services Ltd | Construction | 2017 |
| TDK Holdings SPV Limited | Real estate | 2020 |
| TDS (Lincoln) Ltd | Construction | 2012 |
| Tdvj Limited | Real estate | 2017 |
| Teach Vocation Group Ltd | Professional & scientific | 2011 |
| Teachgb Ltd | Education | 2024 |
| Teal Castle Limited | Real estate | 2024 |