| Thorpe Lodge Limited | Professional & scientific | 2026 |
| Thread Nidderdale CIC | Education | 2025 |
| Three B FD Services Limited | Professional & scientific | 2014 |
| Three Blind Mice Ripon Ltd | Wholesale & retail | 2024 |
| Three Keys Property Ltd | Households | 2025 |
| Three's a Crowd ( Harrogate ) Ltd | Hospitality | 2018 |
| Threes a Crowd LS2 Ltd | Hospitality | 2024 |
| Thrive Properties Limited | Real estate | 2017 |
| Thrive Properties TOO Limited | Real estate | 2022 |
| Thrive Training Method Ltd | Health & social care | 2024 |
| Throstle Estates Limited | Real estate | 2011 |
| Throstle Nest Farm Limited | Real estate | 2017 |
| Thruscross Energy Ltd. | Energy | 2011 |
| Thug Sandwich Company Limited | Hospitality | 2017 |
| Thumbprint Training Ltd | Other services | 2020 |
| Thunder Scenic Solutions Ltd | Construction | 2026 |
| Thunderbolt Studios Limited | Information & communication | 2013 |
| Thunderhawk Limited | Extraterritorial | 2026 |
| TIC Green Energy Limited | Other services | 2010 |
| Tigbit Limited | Information & communication | 2018 |
| Tiger Capital Limited | Financial services | 2018 |
| Tiger Heat Pumps Ltd | Wholesale & retail | 2023 |
| Tikka Harrogate Limited | Hospitality | 2025 |
| Tilia Avenue Limited | Real estate | 2024 |
| Tilor Ltd | Wholesale & retail | 2025 |
| TIM Cavill Finance Limited | Financial services | 2013 |
| TIM Idle Ltd | Professional & scientific | 2013 |
| TIM Wilkinson Builders Limited | Construction | 2022 |
| Tima Renewables Limited | Professional & scientific | 2024 |
| Timber Craft for Trading and Services Ltd | Construction | 2021 |
| Timble Properties Limited | Real estate | 2013 |
| Time Financial Limited | Professional & scientific | 2007 |
| Time Table Ltd | Extraterritorial | 2012 |
| Time Together | Health & social care | 1995 |
| Timeless Movie Limited | Information & communication | 2024 |
| Timewell Solutions & Marketing Ltd | Administrative & support | 2016 |
| Timothy Holt Enterprises Consulting Company Ltd | Administrative & support | 2010 |
| Tindrak Ltd | Manufacturing | 2025 |
| Tiny Tribe Club Ltd | Health & social care | 2026 |
| Tiptoe Management Limited | Real estate | 2010 |
| TIR Oran Consulting Limited | Real estate | 2009 |
| Tirlan Animal Nutrition Limited | Manufacturing | 1991 |
| Titan Allstars Limited | Extraterritorial | 2026 |
| Titan Private Wealth Limited | Financial services | 2003 |
| Titchmarsh & Co. Limited | Real estate | 2008 |
| Tizzmedia Ltd | Other services | 2021 |
| TJ & L Savage Property Limited | Real estate | 2011 |
| TJM Bentley Holdings Limited | Financial services | 2024 |
| Tjsj Limited | Construction | 2021 |
| TLC Health & Fitness (Wetherby) Limited | Arts & recreation | 2014 |
| TLC Health and Fitness Limited | Arts & recreation | 2009 |
| TLP Advisory LLP | | 2011 |
| TLP Capital Limited | Extraterritorial | 2016 |
| TLP Capital Partners Limited | Professional & scientific | 2016 |
| TLP Company Secretary Limited | Extraterritorial | 2020 |
| TLP Consulting Limited | Professional & scientific | 2010 |
| Tlpils 1 Limited | Financial services | 2026 |
| Tlpils 2 Limited | Professional & scientific | 2026 |
| TLS Digital Media Limited | Professional & scientific | 2017 |
| TMA Bishop Limited | Hospitality | 2015 |
| TME Capital Limited | Other services | 2014 |
| TME Consultants Limited | Financial services | 2014 |
| TMP (Bramham) Limited | Real estate | 2007 |
| TMR Foods Ltd | Wholesale & retail | 2019 |
| TMS5 Ltd | Transport & logistics | 2026 |
| TMT Global Healthcare Ltd | Health & social care | 2013 |
| TNP Administration Services Limited | Information & communication | 1988 |
| TO the Point Construction Consultants Limited | Professional & scientific | 2023 |
| Toast of Harrogate (Events) Ltd | Hospitality | 2017 |
| TOB1AS Limited | Extraterritorial | 2020 |
| Toby Whittaker Holdings Limited | Construction | 2004 |
| TOC Harrogate Ltd | Hospitality | 2019 |
| Tocatta Limited | Professional & scientific | 2010 |
| Todandelion Ltd | Administrative & support | 2024 |
| Toddler Sense Harrogate & Wetherby Ltd | Health & social care | 2026 |
| Toddler Tapas Limited | Manufacturing | 2025 |
| Todo Engineering Ltd | Information & communication | 2020 |
| Toft Gate Barn Ltd | Wholesale & retail | 2022 |
| Togather Town Ltd | Information & communication | 2024 |
| Together Media Ltd | Information & communication | 2022 |
| Tollhark Limited | Real estate | 1993 |
| Tomato Ketchup Ltd | Extraterritorial | 2012 |
| Tomlinson Adam Properties Limited | Hospitality | 2025 |
| Toms Mobile Repairs Ltd | Wholesale & retail | 2024 |
| Tonic Developments Ltd | Hospitality | 2015 |
| Tonisa Ltd | Health & social care | 2020 |
| Tonlinson Limited | Extraterritorial | 2025 |
| Tony Blair Limited | Extraterritorial | 2013 |
| Tony Mitchell Ventures Ltd | Professional & scientific | 2022 |
| Tooti BOO Limited | Wholesale & retail | 2003 |
| Top Spec Scaffolding Ltd | Construction | 2024 |
| Top Way Mini Market Ltd | Wholesale & retail | 2025 |
| Top-Tier Cleaning Solutions Ltd | Administrative & support | 2023 |
| Topping Engineers Ltd | Construction | 2007 |
| Toriga Energy Limited | Construction | 2012 |
| Toshiba Limited | Extraterritorial | 2011 |
| Total Finance Limited | Financial services | 2024 |
| Total Training Solutions Europe Limited | Education | 2007 |
| Total Waste Recruitment Ltd | Administrative & support | 2026 |
| Toucas Property Services Limited | Administrative & support | 2024 |