| THP Accountancy Services Limited | Extraterritorial | 2014 |
| THP Accountants & Business Advisors Limited | Professional & scientific | 2025 |
| Threadsafe Systems Ltd | Information & communication | 2025 |
| Three Bees Property Investments Ltd | Real estate | 2024 |
| Thrive & Transform Limited | Other services | 2024 |
| Thrive EPS Limited | Professional & scientific | 2022 |
| Through Life Costing Limited | Professional & scientific | 2002 |
| Thundersley Ltd | Construction | 2024 |
| Thurston Investment Ltd | Real estate | 2017 |
| Thurston Properties Ltd | Real estate | 2017 |
| THY English Academy Ltd. | Professional & scientific | 2014 |
| Tiberius Investments Limited | Financial services | 2017 |
| Tickboxer Ltd | Professional & scientific | 2023 |
| Tidelines Limited | Information & communication | 2000 |
| Tilly T Ltd | Administrative & support | 2026 |
| Timber 4 U Ltd | Wholesale & retail | 2023 |
| Timber Court (Cheam) Management Company Limited | Households | 2021 |
| Timber Grove Landscapes and General Maintenance Ltd | Administrative & support | 2025 |
| Time Capsule Education Ltd | Education | 2015 |
| Time IS Money Bookkeeping Ltd | Professional & scientific | 2020 |
| Time Medical Ltd | Health & social care | 2016 |
| Timetomove Limited | Education | 2025 |
| Timtot LLP | | 2020 |
| TIN Design Limited | Wholesale & retail | 2016 |
| TIN Street Consulting Ltd | Professional & scientific | 2024 |
| Tinted Twig Ltd | Construction | 2021 |
| Tiny LOS Limited | Hospitality | 2025 |
| Tiny Rays of Sunshine Limited | Health & social care | 2025 |
| Tiny Robin's Childcare Ltd | Health & social care | 2023 |
| TIP Top Investments Ltd | Real estate | 2022 |
| Tipsy Squirrel Events Ltd | Hospitality | 2023 |
| TIS Films Limited | Information & communication | 2019 |
| Tisserand Properties Limited | Real estate | 2025 |
| Titanium Build Ltd | Construction | 2018 |
| TJ Brookes Ltd | Financial services | 2023 |
| TJ Fitting Services Limited | Construction | 2003 |
| TJ Higgs Psychic Medium Ltd | Other services | 2022 |
| TJB Plastering Limited | Construction | 2013 |
| TJC Media Ltd | Professional & scientific | 2025 |
| TJM Heating Ltd | Construction | 2023 |
| TKS Advisory Holdings Ltd | Financial services | 2022 |
| TKS Commodities Trading Ltd | Financial services | 2022 |
| TKS Consultancy Ltd | Professional & scientific | 2022 |
| TL Building & Construction Services Limited | Construction | 2020 |
| TL Lifestyle Ltd | Information & communication | 2025 |
| TLC Capital Ltd | Professional & scientific | 2024 |
| TM Advisory Ltd | Professional & scientific | 2018 |
| TMF Benefit Services Limited | Administrative & support | 2025 |
| TMS Talent Europe Limited | Administrative & support | 2020 |
| TNT Services (South East) Ltd | Construction | 2025 |
| Todd Media Limited | Administrative & support | 2017 |
| TOG Training & Empowerment Ltd | Education | 2025 |
| Tokon KAI Karate Ltd | Arts & recreation | 2003 |
| Tolley Construction Limited | Extraterritorial | 2003 |
| TOM GUY Limited | Information & communication | 2012 |
| Tom's Pasta Limited | Hospitality | 2022 |
| Tomlin's Construction Limited | Manufacturing | 2021 |
| Tommo Properties Ltd | Administrative & support | 2014 |
| Tommy Tea Limited | Wholesale & retail | 2010 |
| Toms Shed Limited | Hospitality | 2024 |
| Tonbridge Defender Ltd | Construction | 2021 |
| Tones Construction Limited | Construction | 2018 |
| Tony Aldridge Land Ltd | Construction | 2025 |
| Tony Darling Dog Grooming Ltd | Other services | 2024 |
| Tony Greer Accounting Services Ltd | Administrative & support | 2023 |
| Tonyj Construction Services Ltd | Construction | 2022 |
| Toolbase Environmental Limited | Other services | 2001 |
| Top Draw Design Limited | Information & communication | 2019 |
| Top Flite Lofts Limited | Construction | 2025 |
| Top Spec Electrical Group Limited | Construction | 2020 |
| Toppat Services Ltd | Other services | 2013 |
| Topview Contractors Limited | Construction | 2020 |
| Torch Brickwork Limited | Construction | 2002 |
| Torow Properties Limited | Real estate | 2024 |
| Total Fire & Door Solutions Ltd | Public administration | 2022 |
| Total Home Renovations Ltd | Construction | 2019 |
| Total Property Services Essex Limited | Administrative & support | 2021 |
| Total Protection (Contracting Services) Ltd | Construction | 2022 |
| Total Protection (Fire & Sealing Solutions) Ltd | Public administration | 2013 |
| Total Protection (Holdings) Ltd | Financial services | 2013 |
| Total Protection (Landscaping) Ltd | Professional & scientific | 2014 |
| Total Protection (Management Services) Limited | Administrative & support | 2015 |
| Total Protection (Painting Solutions) Limited | Construction | 2011 |
| Total Protection (Southern Counties) Limited | Construction | 2021 |
| Total Protection (Special Projects) Ltd | Professional & scientific | 2013 |
| Total Reward Projects Limited | Administrative & support | 2011 |
| Total Tree Care Ltd | Administrative & support | 2023 |
| Tots Parties Ltd | Arts & recreation | 2025 |
| Tots World Ltd | Arts & recreation | 2021 |
| Toucan Shopfitters Limited | Wholesale & retail | 1988 |
| Touchmark Ltd | Professional & scientific | 2025 |
| Tower Cranes Consultants Limited | Professional & scientific | 2005 |
| Tower Radio Group Limited | Construction | 1977 |
| Towergate Consultants Limited | Administrative & support | 1998 |
| Townlink Essex Limited | Hospitality | 2016 |
| TP Developments Ltd | Construction | 2022 |
| TP Finance Ltd | Financial services | 2018 |
| TP Investment Holdings Ltd | Real estate | 2021 |
| TP Property Investment Ltd | Real estate | 2018 |
| TP Property Lettings Ltd | Real estate | 2021 |