| T Gibson Consulting Ltd | Information & communication | 2026 |
| T J G Construction (UK) Limited | Construction | 2005 |
| T Mullin Associates Limited | Professional & scientific | 2023 |
| T Phone Repair Ltd | Other services | 2023 |
| T Poole Accounting Services Limited | Professional & scientific | 2012 |
| T W Phoenix Ltd | Construction | 2019 |
| T Williams Construction Ltd | Construction | 2011 |
| T&B Development Ltd | Construction | 2015 |
| T&B Group Ltd | Professional & scientific | 2017 |
| T&C Transform and Convert Limited | Real estate | 2021 |
| T&Jh Property Limited | Real estate | 2025 |
| T. Barry Haulage Limited | Transport & logistics | 1992 |
| T. Booth Aerospace Limited | Extraterritorial | 2025 |
| T. Booth Engineering Limited | Manufacturing | 1981 |
| T. R. Grant Consulting Ltd | Information & communication | 2018 |
| T.J.Hollis Brickwork Stonework and Landscape Limited | Construction | 2024 |
| T.S.Owen Plumbing & Heating Ltd | Construction | 2025 |
| T3 Cyber Limited | Administrative & support | 2025 |
| T3 Global Limited | Administrative & support | 2007 |
| T3A Limited | Professional & scientific | 2001 |
| T5 Van Sales Limited | Wholesale & retail | 2017 |
| Tabletop Studio Ltd | Wholesale & retail | 2005 |
| Tabu Wine and Cocktail Lounge Ltd | Hospitality | 2023 |
| Tactical Hazmat Ltd | Education | 2012 |
| Tactical Multimedia Limited | Professional & scientific | 2023 |
| Taddington Holdings Limited | Financial services | 2023 |
| Tadema Management Limited | Households | 1986 |
| Tadley Land Ltd | Real estate | 2014 |
| Taed Ltd | Other services | 2018 |
| TAG Creative Ltd | Administrative & support | 2022 |
| TAG Trojans Limited | Administrative & support | 2017 |
| Tailor Made Training UK Limited | Education | 2006 |
| Tailored Construction (Cheltenham) Ltd | Construction | 2015 |
| Tailormade Inspiration Ltd | Administrative & support | 2009 |
| Tails About Town Ltd | Other services | 2025 |
| Tails and Trails Pet Care Ltd | Other services | 2025 |
| TAJ Cleeve EX Ltd | Hospitality | 2017 |
| TAJ Cleeve Ltd | Hospitality | 2017 |
| Take Digital Limited | Information & communication | 2018 |
| Take Time Limited | Wholesale & retail | 2006 |
| Take Wellness Ltd | Wholesale & retail | 2018 |
| TAKE2SHOP Ltd | Wholesale & retail | 2026 |
| Takeoff Direct Limited | Education | 2009 |
| Taketown Property Management Limited | Real estate | 1991 |
| Talbot and Clockmakers Management Company Limited | Households | 2023 |
| Talent & Potential Limited | Professional & scientific | 2005 |
| Talent Investment Ltd | Administrative & support | 2019 |
| Tall House Consulting Limited | Professional & scientific | 2019 |
| Tall Marek Ltd | Construction | 2021 |
| Tall Sky Holdings Limited | Administrative & support | 2015 |
| Tall Sky Properties Ltd | Real estate | 2016 |
| Taller Development Ltd | Construction | 2019 |
| Tallis Books Ltd | Wholesale & retail | 2023 |
| Tallon Tattoo Company Limited | Arts & recreation | 2024 |
| Talus Construction Limited | Construction | 2009 |
| TAM Civils Limited | Construction | 2021 |
| TAM Collard Property Limited | Real estate | 2019 |
| Tamar Cottages Ltd | Hospitality | 2022 |
| TAN House Management Committee Limited | Households | 1983 |
| Tancred Hall Care Centre Ltd | Health & social care | 2017 |
| Tancross Limited | Hospitality | 1997 |
| Tandem Management Consultancy Ltd | Financial services | 2014 |
| Tandy Racing LLP | | 2020 |
| Tanglewood House Management Company Limited | Real estate | 2006 |
| Tango Golf Ltd | Manufacturing | 2020 |
| Tangwena UK Ltd | Information & communication | 2023 |
| Tanique (Cheltenham) Ltd | Other services | 2019 |
| Tanna Capital Limited | Financial services | 2021 |
| Tanswell Limited | Financial services | 2009 |
| Tanwood Property Partnership Ltd | Real estate | 2017 |
| Tanya Buxton Limited | Other services | 2019 |
| Tanzania Safari Specialists Limited | Administrative & support | 2001 |
| TAP Business Development Limited | Professional & scientific | 2008 |
| TAP UK Limited | Agriculture & fishing | 1986 |
| Tap&Trend Ltd | Wholesale & retail | 2026 |
| Taps and Tents Ltd | Hospitality | 2019 |
| Taptick Ltd | Administrative & support | 2008 |
| Tapu Healthcare Ltd | Health & social care | 2022 |
| Tara Antiques Ltd | Real estate | 2016 |
| Targa Club Ltd | Other services | 2019 |
| Targa Consulting Limited | Administrative & support | 2025 |
| Targetreach Limited | | 1983 |
| Tarka Talent Limited | Administrative & support | 2020 |
| Taro Chisango Limited | Health & social care | 2025 |
| Tarren Events Ltd | Arts & recreation | 2021 |
| Tarren Production Limited | Administrative & support | 2008 |
| Tasc Ventures Limited | Professional & scientific | 2018 |
| Task Taker Services Limited | Administrative & support | 2015 |
| Taskforce Limited | Manufacturing | 2011 |
| Taste the Region Limited | Wholesale & retail | 2014 |
| Tastespotters Ltd | Manufacturing | 2011 |
| Tasty Garden 888 Limited | Hospitality | 2024 |
| Tavistock House (Cheltenham) Ltd | Households | 2015 |
| Tavus AI Ltd | Administrative & support | 2026 |
| Tax Compute Limited | Professional & scientific | 2014 |
| Tax Crew Limited | Professional & scientific | 2017 |
| Tax Essentials Limited | Extraterritorial | 2013 |
| Tax Manager Limited | Extraterritorial | 1994 |
| TAY Court RTM Company Limited | Households | 2021 |
| Tayford Property Co Ltd | Real estate | 2022 |