| TAJ - Accountants and Business Consultants Ltd | Professional & scientific | 2015 |
| Tajs Property Investment Limited | Real estate | 2023 |
| Talent Exxpert Limited | Administrative & support | 2025 |
| Tandoori Takeaway Ltd | Hospitality | 2023 |
| Tanga Digital Ltd | Professional & scientific | 2018 |
| Tanner Farm Park Trading Limited | Real estate | 2016 |
| Tanning Place Limited | Wholesale & retail | 2006 |
| TAP and Scroll Digital Ltd | Professional & scientific | 2026 |
| Tapp & Sons Limited | Professional & scientific | 2016 |
| Taproom Cleethorpes Ltd | Hospitality | 2019 |
| Target NEL CIC | Public administration | 2024 |
| Tarporley Dental Centre Limited | Health & social care | 2013 |
| Tartan Plant Services Limited | Wholesale & retail | 2026 |
| Tartan Tattie Ltd | Hospitality | 2015 |
| Tartare Consultancy Limited | Information & communication | 2005 |
| Tasker Developments (Lincs) Limited | Construction | 2025 |
| Taste of Dosa Ltd | Hospitality | 2025 |
| Tatari Connect Ltd | Wholesale & retail | 2022 |
| Tatari Realty Company Ltd | Wholesale & retail | 2008 |
| Tatiana Transport Ltd | Transport & logistics | 2026 |
| Tatsu Industries Ltd | Agriculture & fishing | 2022 |
| Tattershall Lakes Caravans Limited | Hospitality | 2017 |
| Tautan Transport Ltd | Transport & logistics | 2023 |
| Tavistock Hospitality Limited | Hospitality | 2014 |
| Taxi Cabs (Grimsby) Limited | Transport & logistics | 1981 |
| Taxi Rental Solutions Ltd | Administrative & support | 2014 |
| Taxxi 4 Hire Ltd | Administrative & support | 2025 |
| Taylor Automation Limited | Administrative & support | 2012 |
| Taylor Electrics Ltd | Construction | 2010 |
| Taylor Enterprises Ltd | Financial services | 2025 |
| Taylor Jones Homes Ltd | Real estate | 2023 |
| Taylor Made Send Solutions Ltd | Education | 2025 |
| Taylors Fruit and VEG Ltd | Wholesale & retail | 2022 |
| Taylors of Lincolnshire Limited | Real estate | 2008 |
| Taylors Paving Limited | Construction | 2018 |
| Taymor Limited | Agriculture & fishing | 2002 |
| TAZ Properties (Brigg) Limited | Real estate | 2017 |
| TB Instrumentation Services Ltd | Administrative & support | 2024 |
| TCA Joinery Limited | Construction | 2026 |
| TCG & More Ltd | Wholesale & retail | 2026 |
| TCH Building & Developments Limited | Construction | 2023 |
| TD Logistic Ltd | Transport & logistics | 2015 |
| Tea&Toast Cafe and Catering Ltd | Hospitality | 2024 |
| Teal Electrical Ltd | Construction | 2020 |
| Team Booth Limited | Professional & scientific | 2014 |
| Team Reality Ltd | Education | 2009 |
| TEAMVALOR8 Ltd | Arts & recreation | 2025 |
| Teasdale Associates Ltd | Construction | 2019 |
| TEC Inspection Services Limited | Other services | 2009 |
| Techbasement Ltd | Other services | 2026 |
| Techbox Managed IT Services Ltd | Information & communication | 2019 |
| Techie Monkey Group Ltd | Wholesale & retail | 2018 |
| Technica Construct Ltd | Construction | 2017 |
| Technica Group Limited | Administrative & support | 2007 |
| Technica Holdings Limited | Financial services | 2016 |
| Technica Limited | Professional & scientific | 2007 |
| Technical Absorbents Limited | Manufacturing | 1993 |
| Technical Maintenance Services Limited | Information & communication | 2026 |
| Technical Solution House Ltd | Manufacturing | 2012 |
| Techpro Support Limited | Information & communication | 2018 |
| Techquip Ltd | Wholesale & retail | 2022 |
| Techrelent Ltd | Information & communication | 2016 |
| Techstay Accommodation Ltd | Administrative & support | 2024 |
| Techvue Distribution (UK) Limited | Professional & scientific | 2012 |
| Teddy's RAW Pet Food Ltd | Wholesale & retail | 2022 |
| Teejays Transport Services Limited | Transport & logistics | 2017 |
| TEK Eleven Ltd | Health & social care | 2026 |
| Teksol Industrial Ltd | Wholesale & retail | 2020 |
| Tellis Construction Ltd | Construction | 2014 |
| Telos Electrical Services Limited | Construction | 2022 |
| Tembotutors Ltd | Education | 2019 |
| Tenc IT Consultancy Limited | Information & communication | 2023 |
| Tennis on Board Limited | Arts & recreation | 2018 |
| Tennyson Management Company Limited | Real estate | 1982 |
| TEP - 72 Ltd | Transport & logistics | 2024 |
| Terblanche Incorporated Ltd | Administrative & support | 2016 |
| Tercos Financial Limited | Financial services | 2007 |
| Terdor Transport Limited | Administrative & support | 2017 |
| Teresa Thomas Limited | Professional & scientific | 2012 |
| Terrock Ltd | Administrative & support | 2024 |
| Terry's Outlet Limited | Wholesale & retail | 2018 |
| Testa Limited | Construction | 2009 |
| Tetney Golf Club Limited | Arts & recreation | 1993 |
| Tetney Phase 2 Management Company Limited | Households | 2022 |
| Tetney Road Motor Sales and Repair Ltd | Wholesale & retail | 2025 |
| Tetney Windows Limited | Construction | 2016 |
| Tezla Limited | Construction | 2012 |
| Tford Electrics Limited | Construction | 2018 |
| TG Services [SW] Ltd | Administrative & support | 2014 |
| TGB Limited | Professional & scientific | 2017 |
| TGC Developments Limited | Real estate | 2022 |
| TGV (Grimsby) Ltd | Real estate | 2017 |
| TH Lean Consultants Ltd | Professional & scientific | 2023 |
| Thai Massage Grimsby Limited | Health & social care | 2023 |
| Thai Visa Express Limited | Other services | 2007 |
| That Cheesecake Place Ltd | Manufacturing | 2025 |
| THE a House Preschool Limited | Education | 2012 |
| THE Abacus PUB Company Limited | Arts & recreation | 1996 |
| THE Adgrid Limited | Information & communication | 2024 |
| THE Anglo Australian Land Company Limited | Real estate | 2004 |