| THE Yorkshire Tile Company Limited | Wholesale & retail | 1974 |
| THE Yorkshire Timber Decking Company Limited | Construction | 2000 |
| THE Yorkshire ZEN Company Ltd | Other services | 2019 |
| THE Youth Elixir Cosmetic Clinic Ltd | Health & social care | 2022 |
| THE Yuvaan's Cafe Ltd | Hospitality | 2025 |
| THE Zeda Group Limited | Wholesale & retail | 2012 |
| THE Zone D&D Ltd | Information & communication | 2025 |
| The-Contracta Limited | Construction | 2016 |
| The.Bra Co Limited | Wholesale & retail | 2018 |
| THE1DEVOTION Ltd | Arts & recreation | 2020 |
| Theacademie.Co.Uk Ltd | Information & communication | 2025 |
| Theaker Pallets Limited | Transport & logistics | 2025 |
| Thealembrand Limited | Hospitality | 2024 |
| Theamers Ltd | Wholesale & retail | 2023 |
| Theandys Ltd | Real estate | 2023 |
| Thebullyboutique Ltd | Wholesale & retail | 2024 |
| Thechosen-Emerald Services Ltd | Hospitality | 2024 |
| Thecityceleb Publishing Ltd | Information & communication | 2025 |
| Theddlethorpe Properties Limited | Real estate | 2013 |
| Thedelightfultouch Ltd | Hospitality | 2021 |
| Thedotland Ltd | Wholesale & retail | 2021 |
| Thee Curious Traveller Tours Ltd | Administrative & support | 2019 |
| Thee Occlestoneian's Limited | Hospitality | 2017 |
| Thegiftschannel Ltd | Wholesale & retail | 2025 |
| Thegoodside CIC | Health & social care | 2025 |
| Thegreenhilltap Ltd | Hospitality | 2025 |
| Thegreenturtleco Ltd | Wholesale & retail | 2020 |
| Theia Creative Group Ltd | Information & communication | 2023 |
| Theibex Ltd | Wholesale & retail | 2019 |
| Theliveworks Ltd | Information & communication | 2021 |
| Themoizstore Ltd | Wholesale & retail | 2025 |
| Theo Bear Trading Company Limited | Health & social care | 1994 |
| Theobora Express Ltd | Transport & logistics | 2018 |
| Theoddfellow Limited | Arts & recreation | 2015 |
| Theoee Limited | Education | 2025 |
| Theone Ltd | Other services | 2018 |
| Theophilus Ogaga Ltd | Arts & recreation | 2026 |
| Theoriginaljigsaw Ltd | Wholesale & retail | 2022 |
| Thepeppermint Ltd | Wholesale & retail | 2021 |
| Thephoneshop 9 Limited | Wholesale & retail | 2025 |
| Thepubgroup Ltd | Hospitality | 2026 |
| Therapy Plan Ltd | Administrative & support | 2017 |
| Therapysessionxyz Ltd | Wholesale & retail | 2024 |
| Therco - Serck Ltd | Other services | 2017 |
| Therco Heat Exchangers Holdings Limited | Financial services | 2023 |
| Therco Heat Exchangers Ltd | Extraterritorial | 2021 |
| Therco-Serck (Projects) Holdings Limited | Financial services | 2023 |
| Therco-Serck (Projects) Ltd | Construction | 2018 |
| Therco-Serck Holdings Limited | Financial services | 2023 |
| Therefore Analytical Ltd | Extraterritorial | 2013 |
| Therefore Consultancy Ltd | Professional & scientific | 2007 |
| Therefore Environmental Testing Ltd | Extraterritorial | 2013 |
| Therefore Management Group Ltd | Extraterritorial | 2013 |
| Therefore Systems Ltd | Extraterritorial | 2013 |
| Therma CUP Ltd | Wholesale & retail | 2018 |
| Thermal Packaging Solutions Limited | Manufacturing | 2015 |
| Thermal Sensors Ltd | Manufacturing | 2010 |
| Thermax Contracting Services Limited | Construction | 1985 |
| Thermofix Services Ltd | Construction | 2022 |
| Thermolast Properties Ltd | Real estate | 2016 |
| Thermologics Ltd | Construction | 2017 |
| Thermosave Limited | Manufacturing | 2010 |
| These Executive Minds (Texem) Limited | Professional & scientific | 2018 |
| Thesuntrap Limited | Other services | 2025 |
| Theta Productions Ltd | Wholesale & retail | 2026 |
| Thevanbeek Ltd | Education | 2024 |
| Think Bespoke (Holdings) Ltd | Real estate | 2025 |
| Think Bespoke Ltd | Manufacturing | 2020 |
| Think Clean Limited | Administrative & support | 2015 |
| Think Interior Ltd | Wholesale & retail | 2025 |
| Think Land & Property Ltd | Real estate | 2024 |
| Think N.B. Limited | Health & social care | 2012 |
| Think Property Consulting Ltd | Real estate | 2023 |
| Think Social Solutions Limited | Information & communication | 2015 |
| Think VPV Ltd | Construction | 2025 |
| Thinkfast Ltd | Other services | 2018 |
| Thinking Space for Philosophical Dialogue and Enquiry C.I.C. | Education | 2015 |
| Thinkingcap Brands Limited | Professional & scientific | 2021 |
| Thinknice Limited | Real estate | 1987 |
| Third Circle Ltd | Information & communication | 2005 |
| Third Element Group Limited | Wholesale & retail | 2025 |
| Third Party PHB Limited | Health & social care | 2024 |
| Third Propco Limited | Administrative & support | 2013 |
| Thirlnay Estates Limited | Real estate | 2026 |
| THIRT33N Barbers Ltd | Other services | 2025 |
| Thirteen (Yorkshire) Limited | Hospitality | 2025 |
| Thirteen Fitness Coaching Ltd | Education | 2025 |
| Thirtynine PUB Co Limited | Hospitality | 2024 |
| This IS Entertainment Ltd | Administrative & support | 2016 |
| This IS Golf Representation Ltd | Professional & scientific | 2025 |
| This IS Golf Travel Ltd | Administrative & support | 2026 |
| This IS Music Limited | Professional & scientific | 2007 |
| This IS NOT a Party Limited | Wholesale & retail | 2017 |
| This IS Southside Ltd | Construction | 2014 |
| This Little L Ltd | Wholesale & retail | 2024 |
| This Machine Ltd | Manufacturing | 2023 |
| This Much Ltd | Information & communication | 2026 |
| This Then That Ltd | Wholesale & retail | 2024 |
| Thistledome Limited | Professional & scientific | 2022 |
| Thistlewhite Ltd | Professional & scientific | 2022 |