| Tilshead Caravans Ltd | Administrative & support | 2006 |
| TIM Adams Associates Ltd | Financial services | 2015 |
| TIM Buckland Ltd | Manufacturing | 2008 |
| TIM Davis Carpet & Flooring Contractor Ltd | Construction | 2012 |
| Timberley Farm Investments Limited | Financial services | 2002 |
| Timberline Building Contractors Ltd | Construction | 2024 |
| Time 4 Health Limited | Information & communication | 2020 |
| Time on Target Limited | Wholesale & retail | 2025 |
| Time to Retreat Ltd | Other services | 2025 |
| Timeless INK Tattoo Studio Limited | Other services | 2015 |
| Timothy Saunders Yacht Design Ltd | Professional & scientific | 2011 |
| Timothy Sutton Decorating Ltd | Administrative & support | 2017 |
| Timtronics Engineering Limited | Professional & scientific | 2022 |
| Tintinit Limited | Extraterritorial | 2011 |
| Tipsy Ventures Ltd | Professional & scientific | 2020 |
| Tirreni Commercial Ltd | Wholesale & retail | 2026 |
| Tisbury Country Housekeeping Ltd | Administrative & support | 2020 |
| Tisbury Delicatessen Ltd | Wholesale & retail | 2013 |
| Titanx Global Ltd | Manufacturing | 2021 |
| TJ Electronics Limited | Administrative & support | 2000 |
| TJ Solomon Limited | Manufacturing | 2023 |
| TJB Brothers Ltd | Wholesale & retail | 2024 |
| Tjbro Goods Ltd | Wholesale & retail | 2022 |
| TJN Plant Limited | Manufacturing | 2024 |
| Tjpropertyuk Ltd | Real estate | 2017 |
| TJS Accountancy (Wiltshire) Limited | Professional & scientific | 2014 |
| TKB Project Consultants Limited | Professional & scientific | 2022 |
| TLC 24/7 Recruitment Limited | Health & social care | 2021 |
| TLC 4 Smiles Limited | Health & social care | 2006 |
| TLS Design & Build Ltd | Construction | 2013 |
| TM Care Professionals Ltd | Health & social care | 2014 |
| TM Wilts Ltd | Arts & recreation | 2026 |
| TMB Partners & Co. Limited | Professional & scientific | 2026 |
| TMD (Leisure) Services Limited | Manufacturing | 2017 |
| TMD Hair and Beauty Ltd | Other services | 2020 |
| Tmesis Ltd | Information & communication | 1996 |
| Tmrw Limited | Information & communication | 2011 |
| TMT Accountancy Services Limited | Professional & scientific | 2009 |
| TMT Properties to Rent Ltd | Real estate | 2021 |
| Tnarg Tnarg Limited | Information & communication | 1998 |
| Tobago Property Limited | Professional & scientific | 2007 |
| Tobit Media Limited | Professional & scientific | 2025 |
| Toccata Resources Limited | Professional & scientific | 2013 |
| Toivo Limited | Hospitality | 2024 |
| Tolerock Ltd | Real estate | 2023 |
| Toll House Maintenance Ltd | Households | 2010 |
| Tollard Royal Enterprises Limited | Real estate | 1982 |
| Tollgate Road Flats (Salisbury) Limited | Households | 1972 |
| TOM Bizley Ltd | Construction | 2019 |
| TOM Boucher Services Ltd | Transport & logistics | 2019 |
| TOM Cunliffe Limited | Arts & recreation | 2002 |
| TOM Liston-Jones Consulting Limited | Professional & scientific | 2021 |
| TOM Patrick Tree Services Limited | Agriculture & fishing | 2015 |
| TOM Sanger Garden Services and Landscaping Ltd | Administrative & support | 2019 |
| Tommi's Burger Joint Ltd. | Administrative & support | 2012 |
| Tomtom Events Ltd | Administrative & support | 2015 |
| Tonari Limited | Wholesale & retail | 2017 |
| Tongs Holdings Ltd | Financial services | 2026 |
| Tonkatx Ltd. | Real estate | 2017 |
| Tony Ellis Plumbing & Heating Ltd | Construction | 2023 |
| Tony Lewis Surveyors Limited | Administrative & support | 2008 |
| Tony Wright Consultancy Limited | Administrative & support | 2014 |
| Tony's Contract Services Ltd | Wholesale & retail | 2025 |
| Toogood Taxis Limited | Transport & logistics | 2002 |
| Top Decor Ltd | Construction | 2005 |
| Top Drawer Linen Services Ltd | Other services | 2025 |
| Top Reach Cleaning Limited | Administrative & support | 2024 |
| Top Ridge MM Ltd | Wholesale & retail | 2018 |
| Top Sips Ltd | Hospitality | 2021 |
| Top to Bottom Inside & OUT Home & Property Maintenance Ltd | Construction | 2026 |
| Topaz Bidco Limited | Financial services | 2023 |
| Topaz Capital Limited | Financial services | 2024 |
| Topaz Croatia Investments Limited | Financial services | 2024 |
| Topaz HV Prop 1 Limited | Financial services | 2024 |
| Topaz HV Prop 2 Limited | Financial services | 2024 |
| Topaz UK Developments Limited | Financial services | 2022 |
| Topaz UK Group Limited | Construction | 2022 |
| Topaz UK Properties Limited | Construction | 2022 |
| Topaz VT Properties Limited | Financial services | 2024 |
| Topscan (UK) Limited | Professional & scientific | 2002 |
| Topsies Group Limited | Wholesale & retail | 2022 |
| Toptech Shotblasting and Powder Coating Limited | Manufacturing | 2021 |
| Topthorn Stud LLP | | 2024 |
| Torino E&I Consultanc Ltd | Wholesale & retail | 2025 |
| Total Approach Limited | Manufacturing | 2018 |
| Total Comms & Utilities Ltd | Information & communication | 2020 |
| Total Decorating Specialists Limited | Construction | 2012 |
| Total Foot Health Limited | Health & social care | 2007 |
| Totally Apartmentz Ltd | Hospitality | 2024 |
| Totally Living Care Limited | Administrative & support | 2013 |
| TOW Path House Riddlesden Management Company Limited | Households | 2004 |
| Tower Pension Trustees Limited | Financial services | 1987 |
| Town OR Country Limited | Hospitality | 2006 |
| Townley Property Development Ltd | Real estate | 2018 |
| Tp's Chimneys & Stoves Ltd | Administrative & support | 2012 |
| TPP Nominees Limited | Financial services | 2001 |
| TQ2 Build Limited | Construction | 2017 |
| Tracey Films Limited | Administrative & support | 2011 |
| Trada Ltd | Information & communication | 2019 |
| Trading Spaces Interiors Limited | Other services | 2012 |