| SYS4 Technologies Ltd | Information & communication | 2020 |
| Systematic Vehicle Movements Ltd | Other services | 2025 |
| Systems Plus Ltd | Real estate | 2004 |
| Syston Specsavers Limited | Wholesale & retail | 2017 |
| Síor Verde Ltd | Wholesale & retail | 2022 |
| T & a Rance Holdings Limited | Financial services | 2025 |
| T & J Cole Limited | Wholesale & retail | 2000 |
| T & T Properties and Developments Ltd | Administrative & support | 2017 |
| T - Miniskips Limited | Water & waste | 1988 |
| T C Jones Groundworks Limited | Construction | 2023 |
| T C Smith Roofing Contractors Limited | Construction | 2007 |
| T E Drake Limited | Administrative & support | 2017 |
| T J Environmental Limited | Mining & quarrying | 1999 |
| T J Transport Group Holdings Limited | Financial services | 2019 |
| T J Transport Ltd. | Transport & logistics | 1994 |
| T J Waste & Recycling Limited | Water & waste | 2004 |
| T L S Security Systems Limited | Administrative & support | 2002 |
| T P S Inspections Limited | Professional & scientific | 2013 |
| T Power Enterprises Ltd | Financial services | 2020 |
| T Power Property Ltd | Real estate | 2024 |
| T Redvers Consultancy Ltd | Professional & scientific | 2026 |
| T&A Water Ltd | Water & waste | 2025 |
| T&C Consultancy Limited | Professional & scientific | 2022 |
| T&K Price Ltd | Health & social care | 2023 |
| T&M Supply Ltd | Wholesale & retail | 2025 |
| T&T Building and Maintenance Limited | Construction | 2026 |
| T&T Facades & Remediation Ltd | Construction | 2026 |
| T&T Properties (Southern) Ltd | Construction | 2023 |
| T-Manor Property Limited | Real estate | 2017 |
| T. P. M. Freehold Limited | Households | 1971 |
| T.Constad & SON Limited | Wholesale & retail | 1951 |
| T.Jago Garden and Design Ltd | Administrative & support | 2011 |
| T.P.M. Management Limited | Households | 1971 |
| T2L Ltd | Transport & logistics | 2020 |
| Tableclothrestaurant Ltd | Hospitality | 2024 |
| Tacito Street Food Ltd | Hospitality | 2025 |
| Tacking Partners Ltd | Financial services | 2024 |
| TAD Property Ltd | Real estate | 2020 |
| Tadaa Ultimate Dance Parties and Events Ltd | Arts & recreation | 2022 |
| Tag-Couriers Ltd | Transport & logistics | 2026 |
| Tagan Marketing Ltd | Information & communication | 2024 |
| Tailored AV Limited | Administrative & support | 2013 |
| Tailored Collection Limited | Professional & scientific | 2019 |
| Tailored Entertainment Limited | Arts & recreation | 2011 |
| Tailormade-Pools Ltd | Other services | 2021 |
| Take the Plunge Plumbing & Drain’S Ltd | Construction | 2019 |
| Talbot Green Specsavers Limited | Wholesale & retail | 2012 |
| Talbot Heath Specsavers Limited | Wholesale & retail | 2018 |
| Talenetic Group Limited | Professional & scientific | 2015 |
| Talenetic Limited | Other services | 2014 |
| Talent Legion Ltd | Administrative & support | 2023 |
| Talented People Limited | Professional & scientific | 2007 |
| Talisman Engineering Ltd | Real estate | 2018 |
| Talk Buildings Ltd | Construction | 2023 |
| Talkers Ltd | Administrative & support | 2020 |
| Tamarati Ltd | Real estate | 2023 |
| Tamarind Court Residents Management Limited | Households | 1988 |
| Tamborel Limited | Extraterritorial | 2017 |
| Tamworth Specsavers Hearcare Limited | Wholesale & retail | 2013 |
| Tamworth Ventura Specsavers Limited | Wholesale & retail | 2018 |
| Tamworth Visionplus Limited | Wholesale & retail | 1991 |
| Tandem Electrical Limited | Construction | 2013 |
| Tandem Property Developments Ltd | Real estate | 2023 |
| Tander Homes Ltd | Real estate | 2017 |
| Tank Hits TCG Ltd | Wholesale & retail | 2026 |
| Tanya Long Professional Hairstylist Ltd | Other services | 2019 |
| Tappenden House Management Company Limited | Households | 2015 |
| Tappy's Home Improvements Ltd | Construction | 2024 |
| Tara Dixon Coaching Limited | Arts & recreation | 2024 |
| Target Building Limited | Construction | 2014 |
| Target Construction Group Ltd | Financial services | 2023 |
| Target Construction Ltd | Construction | 2023 |
| Target Groundwork’S Ltd | Construction | 2019 |
| Target Plant Hire Ltd | Administrative & support | 2020 |
| Target Pruning Ltd | Administrative & support | 2025 |
| Target Roofing Limited | Construction | 2008 |
| Tarshagufta Limited | Information & communication | 2015 |
| Task Welding Limited | Manufacturing | 1998 |
| Taskify Ltd | Administrative & support | 2025 |
| Taskly Design Co. Ltd | Wholesale & retail | 2025 |
| Taunton Specsavers Hearcare Limited | Wholesale & retail | 2013 |
| Taunton Specsavers Limited | Wholesale & retail | 1985 |
| Tavistock Specsavers Limited | Wholesale & retail | 2001 |
| Taxangles Limited | Other services | 2012 |
| Taxi House Opco Limited | Real estate | 2025 |
| Taxsense Accountants Limited | Professional & scientific | 2010 |
| Taxsense Company Services Limited | Professional & scientific | 2010 |
| Taxsense Group Holdings Limited | Professional & scientific | 2016 |
| Taxsense Property Services Limited | Real estate | 2012 |
| Taylor & Readman Ltd | Hospitality | 2020 |
| Taylor Airconditioning Engineering Ltd | Manufacturing | 2013 |
| Taylor Bros Roofing Limited | Construction | 2002 |
| Taylor Made Medicine Limited | Health & social care | 2021 |
| Taylor's Sleeping Cubs Ltd | Other services | 2025 |
| Taylormade Clay Limited | Construction | 2022 |
| Taylormade GAS Ltd | Construction | 2021 |
| Tayon Ltd | Information & communication | 2022 |
| Tazze.Co.Uk Limited | Information & communication | 2016 |
| TBG International Limited | Wholesale & retail | 2025 |
| TBT I.T. Solutions Limited | Information & communication | 2018 |