| THE Wright Way LEE Wright Limited | Hospitality | 2013 |
| THE Wycombe Environment Centre Limited | Wholesale & retail | 2001 |
| The-Physio-Room Limited | Health & social care | 2013 |
| THE1STREP Ltd | Wholesale & retail | 2026 |
| Theatre on the River Limited | Professional & scientific | 2017 |
| Theban Limited | Health & social care | 2012 |
| Thebest Builders Limited | Construction | 2023 |
| Thebest Carpentry Limited | Construction | 2018 |
| Thebridge.Guru Limited | Administrative & support | 2025 |
| Thedrinkschool Limited | Education | 2021 |
| Theglobalfits Ltd | Wholesale & retail | 2023 |
| Thehubworks Ltd | Other services | 2015 |
| Themasterstroke Limited | Arts & recreation | 2023 |
| Themedawn Limited | Wholesale & retail | 1994 |
| Theo Cleaning Ltd | Administrative & support | 2022 |
| Theo Piano Tuner Limited | Arts & recreation | 2019 |
| Therasmile Ltd | Health & social care | 2025 |
| Theyellowstones Ltd | Wholesale & retail | 2025 |
| Thimble Holdings Limited | Financial services | 2025 |
| Think Architects Ltd | Construction | 2018 |
| Think Smart Academy 4 Limited | Education | 2020 |
| Think Systems Consulting UK Limited | Professional & scientific | 2024 |
| Thinkable Cloud Ltd. | Professional & scientific | 2014 |
| Thirteen Quints Developers Ltd | Real estate | 2020 |
| Thirteen Quints Ltd | Manufacturing | 2020 |
| Thjb Limited | Real estate | 2018 |
| Thm&P Limited | Wholesale & retail | 2018 |
| Thomas Borer Design Ltd | Professional & scientific | 2025 |
| Thomas Lowe and Sons,Limited | Extraterritorial | 1922 |
| Thomas Lowe Homes Limited | Extraterritorial | 1970 |
| Thompson Consulting International Ltd | Professional & scientific | 2010 |
| Thompson Wilson Estate Agents Ltd | Real estate | 2023 |
| Thompsonix Limited | Information & communication | 2000 |
| Thomson Commercial Properties Ltd | Real estate | 2019 |
| Thomson Estates Limited | Real estate | 2021 |
| Thomson Towers Ltd | Real estate | 2022 |
| Thorn Marketing Limited | Administrative & support | 2016 |
| Thorpes Holdings Limited | Financial services | 2021 |
| Thourea Consulting Limited | Professional & scientific | 2024 |
| Threaf Design Ltd | Construction | 2009 |
| Three Counties Properties HW Limited | Real estate | 2024 |
| Three INT Solutions Limited | Information & communication | 2018 |
| Three Oak Gold Limited | Information & communication | 2023 |
| Three X Three Ltd | Professional & scientific | 2024 |
| Thrift & Thrive Ltd | Wholesale & retail | 2024 |
| Thrivehub.Works Limited | Information & communication | 2022 |
| Throttle Motors Ltd | Wholesale & retail | 2020 |
| Thtjb Limited | Health & social care | 2018 |
| Thunderbolts Group Limited | Manufacturing | 1993 |
| Thunderbolts Limited | Manufacturing | 1993 |
| Thunderstorm Ventures Limited | Professional & scientific | 2023 |
| Thymotec Ltd | Professional & scientific | 2026 |
| Tick-Vg Ltd | Information & communication | 2022 |
| Tiedye and Sorts Ltd | Wholesale & retail | 2024 |
| TIG4 Properties Ltd | Real estate | 2025 |
| Tiga Travel Ltd | Transport & logistics | 2023 |
| Tiger & Bear Limited | Health & social care | 2020 |
| Tiger Cars (Wycombe) Limited | Transport & logistics | 2020 |
| Tiger Doyle Ltd | Information & communication | 2018 |
| Tiger Gymnastics Academy Ltd | Arts & recreation | 2023 |
| Tigerlicious Ltd | Professional & scientific | 2009 |
| Tigers Auto Repairs Ltd | Wholesale & retail | 2025 |
| Tigers Mini Buses (HW) Ltd | Transport & logistics | 2025 |
| Tijara Pro Limited | Wholesale & retail | 2025 |
| Tiklab Limited | Wholesale & retail | 2025 |
| Tilelux Studio Ltd | Manufacturing | 2025 |
| Tiles Market Ltd | Wholesale & retail | 2023 |
| Tiling Services Ltd | Construction | 2025 |
| Tillco Properties Limited | Real estate | 2022 |
| TIM North and Associates Limited | Professional & scientific | 1988 |
| Timbart Building Works Ltd | Construction | 2020 |
| Timber Consulting UK Ltd | Professional & scientific | 2024 |
| Timber Creations Ltd | Construction | 2019 |
| Time Squared Technology Ltd | Information & communication | 2024 |
| Timelesstrndz Ltd | Wholesale & retail | 2026 |
| Timeline Autos Ltd | Wholesale & retail | 2016 |
| Timeout Cafe Ltd | Hospitality | 2023 |
| Timpson's Smallholding Limited | Manufacturing | 2012 |
| TIN Trips Ltd | Hospitality | 2020 |
| Tinx Therapy Ltd | Professional & scientific | 2013 |
| Tiny Plant Publishing Ltd | Information & communication | 2024 |
| TIP Top Apartments Ltd | Hospitality | 2022 |
| Tiptoes Performing Arts Limited | Arts & recreation | 2016 |
| Tireless Technical Services Limited | Professional & scientific | 2021 |
| Tissot-Tech Ltd | Information & communication | 2025 |
| Titan Haulage Ltd | Transport & logistics | 2014 |
| Titanium Cars Ltd | Wholesale & retail | 2026 |
| Titanone Home Improvement Ltd | Other services | 2022 |
| Titans Transport Group Ltd | Transport & logistics | 2026 |
| Titanselectrical Ltd | Construction | 2026 |
| Titman Edge Ltd | Other services | 2020 |
| Titus Technology Ltd | Information & communication | 2020 |
| TJA Interiors Ltd | Construction | 2015 |
| TJA Tack Holdings Ltd | Real estate | 2024 |
| TJA Tack Properties Ltd | Real estate | 2025 |
| Tjcii UK | Other services | 2009 |
| TJM Courier Services Limited | Transport & logistics | 2025 |
| TJS Education Ltd | Professional & scientific | 2015 |
| TKW Plumbing & Heating Ltd | Construction | 2011 |
| TL Cafe Ltd | Hospitality | 2025 |