| Thorne Commercial Surveyors Ltd | Professional & scientific | 2021 |
| Thornham Investments Limited | Professional & scientific | 2013 |
| Thornham Investments NO 2 Ltd | Financial services | 2025 |
| Thoroughbred Polo Ponies Limited | Arts & recreation | 2010 |
| Thorpe House (Ross-On-Wye) Management Company Limited | Real estate | 2009 |
| Thorpe Marsh DC Limited | Information & communication | 2025 |
| Thorpe Marsh NG Limited | Financial services | 2022 |
| Thread & Thrive Limited | Administrative & support | 2025 |
| Three Ashes (SW Care) Ltd | Health & social care | 2018 |
| Three Counties Clinic Ltd | Health & social care | 2026 |
| Three Counties School of Music Limited | Education | 2011 |
| Three Cousins Properties Ltd | Real estate | 2023 |
| Three Fates Tattoo Ltd | Administrative & support | 2024 |
| Three Little Dragons Limited | Health & social care | 2026 |
| Three Maids Renewable Energy Limited | Energy | 2019 |
| Three Oaks Storage Solutions Ltd | Transport & logistics | 2025 |
| Three Okes Landscapes Ltd | Administrative & support | 2024 |
| Three Peas Enterprise Ltd | Real estate | 2023 |
| Three Phases Electrical Ltd | Construction | 2015 |
| Three Pillars Hospitality Limited | Hospitality | 2025 |
| Three Spires Capital Ltd | Construction | 2017 |
| Three Waves Developments Limited | Construction | 2022 |
| THREE888'S Ltd | Real estate | 2019 |
| Threegate (Cheltenham) Limited | Real estate | 2025 |
| Thriftee Limited | Wholesale & retail | 2025 |
| Thrive (Education) Recruitment Ltd | Administrative & support | 2020 |
| Thrive by Blackfinch Limited | Financial services | 2021 |
| Thrive Theory Ltd | Information & communication | 2024 |
| THRIVE18 Limited | Real estate | 2024 |
| Thriveit Consult Ltd | Information & communication | 2025 |
| Thriving Language Community Interest Company | Education | 2021 |
| Thropos Limited | Professional & scientific | 2006 |
| Thurcroft B Ltd | Energy | 2021 |
| Thwc Group Ltd | Administrative & support | 2018 |
| Thyme Construction Group Limited | Construction | 2025 |
| Thyme Designs Limited | Financial services | 2021 |
| Tianhe Runfeng UK Ltd | Wholesale & retail | 2023 |
| Tickle Hudson Limited | Professional & scientific | 2010 |
| Tide and Bone Ltd | Information & communication | 2025 |
| Tideberry Co. Ltd | Wholesale & retail | 2025 |
| Tides Business Development Ltd | Professional & scientific | 2013 |
| Tier Global (Aviation) Limited | Transport & logistics | 2019 |
| Tier Global (Estates) Limited | Administrative & support | 2022 |
| Tier Global (Holdings) Limited | Transport & logistics | 2020 |
| Tier Global (UK) Limited | Manufacturing | 2016 |
| Tier One Medical Rescue Consultancy and Training Ltd | Administrative & support | 2024 |
| Tiffany Engineering Systems Limited | Professional & scientific | 2006 |
| Tigermami Studio Limited | Extraterritorial | 2023 |
| Tigerstripes Software Limited | Information & communication | 2016 |
| Tigin Limited | Information & communication | 2017 |
| Tigirard Ltd | Wholesale & retail | 2025 |
| Tikes Representative Ltd | Arts & recreation | 2023 |
| Tile Trader (Stroud) Limited | Wholesale & retail | 2003 |
| Tiledb Ltd | Administrative & support | 2025 |
| Till the END Games Ltd | Information & communication | 2026 |
| Tilt Technologies Limited | Information & communication | 2021 |
| TIM Friar Creative Ltd | Professional & scientific | 2016 |
| TIM Hawkins Motor Repairs Ltd | Wholesale & retail | 2011 |
| TIM Jenner Sun Beds | | 1992 |
| TIM Rusbridge Eventing Limited | Agriculture & fishing | 2014 |
| Tim's Transport Ltd | Transport & logistics | 2007 |
| Timbercombe Gate Management Company Limited | Households | 2010 |
| Timbercombe Mews Residents Limited | Real estate | 1994 |
| Timbrell Law Limited | Professional & scientific | 2018 |
| Time for Strategy Limited | Professional & scientific | 2022 |
| Time Personnel Recruitment Limited | Administrative & support | 2011 |
| Timesfirst Limited | Professional & scientific | 2000 |
| Timmaz Ltd | Hospitality | 2020 |
| Tinbury Limited | Real estate | 2006 |
| Tintgenies Limited | Professional & scientific | 2018 |
| Tiny Acorns Nursery Limited | Education | 2009 |
| Tiny Giant Entertainment Limited | Administrative & support | 2022 |
| Tiny Lagoon Ltd | Professional & scientific | 2020 |
| Tiny OWL Studio Limited | Manufacturing | 2019 |
| Tiny Task Handyman Ltd | Other services | 2026 |
| Tiny Treasures Day Nursery Ltd | Administrative & support | 2003 |
| Titanium Growth Ltd | Financial services | 2025 |
| Titanium Heating and Plumbing Ltd | Construction | 2020 |
| Titanium Property Solutions Limited | Real estate | 2022 |
| Titanium Trading Limited | Professional & scientific | 2014 |
| Tithe Barn Preschool Ltd | Education | 2026 |
| Tivoli Care Limited | Professional & scientific | 2019 |
| Tivoli Design Ltd | Professional & scientific | 2018 |
| Tivoli Finance LLP | | 2021 |
| Tivoli Healthspan Limited | Professional & scientific | 2023 |
| Tivoli Holdings Ltd | Professional & scientific | 2024 |
| Tivoli Hot WAX Ltd | Health & social care | 2018 |
| Tivoli Lawn Management Company Limited | Households | 2003 |
| Tivoli Legal Limited | Professional & scientific | 2022 |
| Tivoli Mansions (Cheltenham) Management Limited | Households | 2016 |
| Tivoli Mansions Management RTM Limited | Households | 2007 |
| Tivoli Prom Limited | Real estate | 2013 |
| Tivoli Wines Limited | Wholesale & retail | 2016 |
| TIX Future Technologies Limited | Information & communication | 2026 |
| Tixbrain AI Ltd | Information & communication | 2026 |
| Tixperience (UK) Ltd | Information & communication | 2026 |
| Tixperience Group Ltd | Information & communication | 2026 |
| Tjcompanyuk Ltd | Wholesale & retail | 2026 |
| TJO Services Limited | Professional & scientific | 2016 |
| TL Care Homes Limited Liability Partnership | | 2003 |