| Truesdale Assets Limited | Real estate | 2016 |
| Truffle Wood Futures Limited | Information & communication | 2023 |
| Truline Construction Group Limited | Financial services | 2021 |
| Truline E.W.I Limited | Construction | 2021 |
| Truline Fire Protection Limited | Public administration | 2021 |
| Truline Homes Limited | Construction | 2021 |
| Truline Innovative Building Solutions Limited | Construction | 2010 |
| Truline Property Investments Limited | Real estate | 2018 |
| Truline Rainscreen Solutions Ltd | Construction | 2021 |
| Truline Remediation Limited | Water & waste | 2021 |
| Truline Roofing Limited | Construction | 2021 |
| Truly Blooming Limited | Health & social care | 2024 |
| Truman Plumbing and Heating Ltd | Construction | 2024 |
| Trusmart Ltd | Hospitality | 2024 |
| Trust Homecare Solution Lincoln Limited | Health & social care | 2023 |
| Trust Land & Green Ltd | Real estate | 2013 |
| Trust Wills and Probate Limited | Professional & scientific | 2008 |
| Trusted Employment Solutions Limited | Administrative & support | 2019 |
| Truswells Joinery Limited | Construction | 2002 |
| Tshapedprocurement Limited | Professional & scientific | 2023 |
| TSJ Holdings Ltd | Wholesale & retail | 2017 |
| Tsltd Limited | Professional & scientific | 2022 |
| Tswhittaker Limited | Information & communication | 2017 |
| TT Fleet Solutions Limited | Wholesale & retail | 2024 |
| TT Management (Coleby) Limited | Extraterritorial | 2016 |
| TU2 Boutique Ltd | Wholesale & retail | 2016 |
| Tucann Ltd | Information & communication | 2003 |
| Tuckers Trucks Ltd | Transport & logistics | 2022 |
| Tudor Building & Roofing Services Limited | Construction | 2021 |
| Tunstall Financial Management Ltd | Professional & scientific | 2022 |
| Tupper Enterprises Limited | Information & communication | 2008 |
| Turbo R&D UK Limited | Other services | 2016 |
| Turf Amenity Supplies Limited | Wholesale & retail | 2014 |
| Turks Head Legal Limited | Professional & scientific | 2026 |
| Turley Farms Limited | Extraterritorial | 1999 |
| Turner & Barker Electrical Ltd | Construction | 2017 |
| Turner & Turner Limited | Extraterritorial | 2007 |
| Turner Wong Estates Ltd | Real estate | 2026 |
| Turney and Atkinson Ltd | Real estate | 2018 |
| Turnstyle Construction Limited | Construction | 1999 |
| Turzanski Developments Ltd | Real estate | 2026 |
| Tutty Properties Ltd | Real estate | 2024 |
| Tuxford Windmill Limited | Manufacturing | 2005 |
| TWD Installations Ltd | Construction | 2015 |
| Twds Digital Ltd | Information & communication | 2011 |
| Twelvefifteen Engineering Ltd | Professional & scientific | 2012 |
| Twicon Limited | Extraterritorial | 2012 |
| Twilight Considerations Ltd | Extraterritorial | 2012 |
| Twincart Limited | Wholesale & retail | 2025 |
| Twinings Bidco Limited | Financial services | 2021 |
| Twinkle Needle Limited | Wholesale & retail | 2019 |
| Twivey Collins Properties Ltd | Real estate | 2024 |
| Two Bald Bakers Limited | Other services | 2020 |
| Two Bears Studio Limited | Professional & scientific | 2022 |
| Two J T Building Solutions Ltd | Construction | 2020 |
| Two Saturdays Limited | Professional & scientific | 2019 |
| Twynbrain Ltd. | Wholesale & retail | 2014 |
| Tyco Ltd | Professional & scientific | 2021 |
| Tyres and Alloys Centre Ltd | Wholesale & retail | 2017 |
| Tyto Law Limited | Professional & scientific | 2018 |
| U Drive MSM Limited | Education | 2010 |
| UCF Services (Lincoln) Ltd | Manufacturing | 2004 |
| Udcs Holdings Limited | Financial services | 2020 |
| Ufsi Homes Ltd | Real estate | 2024 |
| UK Alternative Energy Ltd | Construction | 2009 |
| UK Ambulances Ltd | Professional & scientific | 2012 |
| UK Automation Services Limited | Construction | 2008 |
| UK Cabs Lincoln Ltd | Transport & logistics | 2021 |
| UK Diesel Engineers Ltd | Manufacturing | 2012 |
| UK Events Crew Ltd | Administrative & support | 2018 |
| UK Hearing and Balance Services Ltd | Health & social care | 2015 |
| UK Prestige Services Ltd | Other services | 2019 |
| UK Residential Opportunities Limited Partnership | | 2010 |
| UK Restaurant Furniture Ltd | Wholesale & retail | 2024 |
| UK STORE99 Ltd | Wholesale & retail | 2025 |
| UK Sweet Supply Ltd | Wholesale & retail | 2025 |
| UK Urology Limited | Health & social care | 2008 |
| UK Watch Ltd | Extraterritorial | 2013 |
| UK Watch Security Services Ltd | Administrative & support | 2016 |
| UK Watch Services Ltd. | Extraterritorial | 2002 |
| UK Windows Express Ltd | Manufacturing | 2025 |
| Uk-China Link Ltd | Professional & scientific | 2023 |
| UKA Valeting Ltd | Administrative & support | 2025 |
| Ukfprs Ltd | Water & waste | 2020 |
| UL Learning Resources Limited | Education | 1998 |
| Ultimate Demolition and Construction Service Limited | Construction | 2011 |
| Ultimate Finish PCS Limited | Administrative & support | 2003 |
| Ultimate Property and Gardening Services Ltd | Professional & scientific | 2024 |
| Ultimate Reclaim Ltd | Wholesale & retail | 2019 |
| Ultratech Products Ltd | Other services | 2023 |
| UM Ecomm Store Ltd | Wholesale & retail | 2024 |
| Umbrella Brands Group Ltd | Financial services | 2018 |
| Umbrella Lincs Ltd | Financial services | 2026 |
| Unapologetic Skin Limited | Real estate | 2021 |
| Underhood Ltd | Wholesale & retail | 2016 |
| Unencoded Limited | Information & communication | 2024 |
| UNI Freshers Ltd | Arts & recreation | 2013 |
| Unicorn Books Limited | Wholesale & retail | 2019 |
| Uninet System Solutions Limited | Information & communication | 1992 |
| Union Street (Market Rasen) Limited | Real estate | 2019 |