| Thelonious Studios Ltd | Information & communication | 2018 |
| Theobald Fitness Limited | Health & social care | 2019 |
| Theprofessionalidiots Ltd | Information & communication | 2024 |
| Therml Limited | Professional & scientific | 2024 |
| Theta Delta Software Limited | Information & communication | 2025 |
| They DID IT Limited | Information & communication | 2006 |
| Think & Partners Limited | Professional & scientific | 2021 |
| Think Globally ACT Locally Limited | Administrative & support | 2019 |
| Think Smart Consultancy Limited | Information & communication | 2019 |
| Think-First Tech Ltd | Information & communication | 2025 |
| Thinking Sports Solutions Limited | Information & communication | 2016 |
| Third Letter Limited | Households | 2023 |
| Third Parallel Ltd | Wholesale & retail | 2025 |
| This IS Nomad Ltd | Information & communication | 2018 |
| Thomas & Antony Limited | Hospitality | 2026 |
| Thomas Amusement Services Limited | Professional & scientific | 2013 |
| Thomas Camera Services Limited | Manufacturing | 1989 |
| Thomas Clarke & Son(Southborough)Limited | Construction | 1968 |
| Thomas Litigation Limited | Professional & scientific | 2020 |
| Thomas Mansfield Solicitors Limited | Professional & scientific | 2012 |
| Thomas Tudor Partners Limited | Professional & scientific | 2014 |
| Thomashaywood Limited | Professional & scientific | 2011 |
| Thomson Snell & Passmore LLP | | 2014 |
| Thomson Snell & Passmore Trust Corporation Limited | Professional & scientific | 2015 |
| Thorndown Flats Limited | Households | 1974 |
| Thornhouse Cruse Limited | Professional & scientific | 2024 |
| Thornleigh Court Management Ltd | Households | 2010 |
| Thoughtversity Ltd | Professional & scientific | 2024 |
| Threadstone Limited | Wholesale & retail | 2014 |
| Three Countys Cleaning Services Limited | Professional & scientific | 2012 |
| Three Dolphins Limited | Financial services | 2025 |
| Three Gates Land Ltd | Real estate | 2022 |
| Three Point Communications Ltd | Professional & scientific | 2018 |
| Thuasne UK Limited | Wholesale & retail | 1995 |
| Tiada Ltd | Transport & logistics | 2021 |
| TIB Property Limited | Real estate | 2018 |
| Tibay Europe Limited | Manufacturing | 2015 |
| Tibbs Paper Co Ltd | Wholesale & retail | 2025 |
| Tidal Consulting Ltd | Professional & scientific | 2025 |
| Tiddlers Childcare Limited | Health & social care | 2009 |
| Tiger and Snake (UK) Limited | Arts & recreation | 2016 |
| Tiger Resourcing Group Ltd | Administrative & support | 2020 |
| Tigers Gymnastics Centre CIC | Education | 2019 |
| Tigerstone Consulting Ltd | Professional & scientific | 2025 |
| Tilbrook's Employment Lawyers Ltd | Professional & scientific | 2023 |
| Tilly and TED Limited | Wholesale & retail | 2023 |
| TIM Beames Limited | Health & social care | 2008 |
| TIM Faircliff Limited | Professional & scientific | 2012 |
| TIM Gentry Consulting Ltd. | Professional & scientific | 2016 |
| TIM Holdings Ltd | Construction | 2025 |
| Timbered Flooring Co Ltd | Construction | 2017 |
| Timbered Limited | Construction | 2012 |
| Timbered Trade Ltd | Administrative & support | 2016 |
| Time Electronics Limited | Manufacturing | 1967 |
| Time Rediscovered Ltd | Wholesale & retail | 2016 |
| Timeless Property Ventures Ltd | Real estate | 2024 |
| Timely Business Solutions Limited | Information & communication | 2007 |
| Timelyintervention Limited | Information & communication | 1998 |
| Timpossible Ltd | Information & communication | 2025 |
| Tina Sadler Limited | Information & communication | 2006 |
| Tinker Limited | Financial services | 2026 |
| Tinto Consultancy Limited | Information & communication | 2015 |
| Tiny Shell Media Ltd | Information & communication | 2022 |
| TIP Top TOM Contractors Limited | Construction | 2022 |
| Tipz N Toez Limited | Other services | 2014 |
| Tishe Limited | Health & social care | 2024 |
| Titan SL Ltd | Construction | 2015 |
| Titanforge Metals Private Limited | Wholesale & retail | 2026 |
| TJ Media Holdings Ltd | Financial services | 2020 |
| TJ Property Solutions Ltd | Construction | 2017 |
| TJB Wholesale Ltd | Wholesale & retail | 2023 |
| TJK Models Limited | Arts & recreation | 2020 |
| TJS Ryka Ltd | Hospitality | 2022 |
| TLC Stoves Ltd | Manufacturing | 2022 |
| TLC Sweeps Ltd | Administrative & support | 2023 |
| TLF Investments Limited | Real estate | 2005 |
| TMM Production Ltd | Professional & scientific | 2019 |
| TMM Renewables and Construction Limited | Construction | 2022 |
| TN Accountancy Ltd | Professional & scientific | 2018 |
| TN Arts Festivals Ltd | Arts & recreation | 2025 |
| TN Beauty & Nails Limited | Other services | 2017 |
| TN Lettings Ltd | Real estate | 2020 |
| TN Recruits Limited | Administrative & support | 2014 |
| TN School Transport Ltd | Transport & logistics | 2021 |
| TN Tax Limited | Professional & scientific | 2021 |
| TN Woodland CIC | Administrative & support | 2012 |
| TN1 Catering Ltd | Hospitality | 2021 |
| TN1 Scaffolding Ltd | Construction | 2021 |
| TN1PROPERTIES Ltd | Real estate | 2023 |
| TN2 Couriers Ltd | Transport & logistics | 2026 |
| TN4CONSULTING Ltd | Professional & scientific | 2019 |
| TO BE Healthier Retreats Ltd | Education | 2022 |
| Tobias Construction Limited | Construction | 2023 |
| TOC H Hall Ltd | Arts & recreation | 2020 |
| Tohax Limited | Information & communication | 2014 |
| Tokiwi Investments Limited | Real estate | 2022 |
| Tolny Ltd | Wholesale & retail | 2022 |
| TOM Armitage Technology Ltd | Information & communication | 2020 |
| TOM Blake Design Limited | Information & communication | 2009 |
| TOM Broadhurst Design Ltd | Professional & scientific | 2025 |