| Symons Utility Solutions Ltd | Construction | 2021 |
| Synergy Accountants Ltd | Professional & scientific | 2019 |
| Synergy Accounting and Consultancy Services Limited | Professional & scientific | 2015 |
| Synergy Church Ltd | Other services | 2020 |
| Synergy Education Ltd | Education | 2012 |
| Synergy Pro Solutions Ltd | Other services | 2024 |
| Synertic Limited | Manufacturing | 2018 |
| Syntax Investment Ltd | Real estate | 2025 |
| Sysco Builders Ltd | Construction | 2026 |
| SYSTEC2 Ltd | Information & communication | 2011 |
| Systematic Horizon Limited | Information & communication | 2023 |
| Sywan London Limited | Wholesale & retail | 2024 |
| Syza Ltd | Real estate | 2024 |
| T & T Transfer Ltd | Transport & logistics | 2018 |
| T and GEE Construction Ltd | Construction | 2014 |
| T Gunning Limited | Extraterritorial | 2019 |
| T Gunning Property Investments Ltd | Real estate | 2018 |
| T Lama Electrics Limited | Construction | 2025 |
| T Lama Ltd | Construction | 2022 |
| T Lounge Ltd | Hospitality | 2019 |
| T M Global Trading Limited | Administrative & support | 2014 |
| T Rahman Enterprise Ltd | Households | 2024 |
| T Shepherd Ltd | Health & social care | 2025 |
| T Square Catering Limited | Hospitality | 2024 |
| T Wahab Limited | Wholesale & retail | 2026 |
| T&C Distribution Ltd | Transport & logistics | 2019 |
| T&J Homes Ltd | Real estate | 2022 |
| T&J V2AR Ltd | Construction | 2019 |
| T&L Recruitment Company Limited | Administrative & support | 2011 |
| T&M General Building Ltd | Construction | 2012 |
| T&R Design to Build Ltd | Construction | 2023 |
| T&T Taxis Ltd | Administrative & support | 2020 |
| T&U Properties Ltd | Real estate | 2025 |
| T-Advance Payroll Umbrella Ltd | Professional & scientific | 2017 |
| T-Reigns Services Limited | Professional & scientific | 2014 |
| T-Tech Business Intelligence Limited | Information & communication | 2012 |
| T.I.L. Heating & Plumbing Ltd | Construction | 2015 |
| T2 Adult Learning Ltd | Education | 2019 |
| T2 Madrasah Ltd | Education | 2022 |
| T2 Tuition Ltd | Education | 2017 |
| T2BOUTIQUE Ltd | Wholesale & retail | 2020 |
| Tabarak Academy Ltd | Education | 2024 |
| Taboyab Ltd | Health & social care | 2015 |
| Tactil Ltd | Wholesale & retail | 2026 |
| Tactlabel Clothing Ltd | Wholesale & retail | 2026 |
| Tadas Traders Ltd | Construction | 2026 |
| Tadeve Consultant Limited | Information & communication | 2019 |
| Tadon Enterprise Ltd | Information & communication | 2016 |
| Tafbazaar Ltd | Wholesale & retail | 2024 |
| Tahis London Services Ltd | Other services | 2017 |
| Tahneek Limited | Education | 2019 |
| Tailormade Hides Ltd | Wholesale & retail | 2024 |
| Taiwokonsulting Limited | Information & communication | 2026 |
| TAJ Mahal Richmond Limited | Hospitality | 2019 |
| Tajiga Ltd | Other services | 2025 |
| Tajmin Limited | Administrative & support | 2025 |
| Take Away East London Ltd | Hospitality | 2022 |
| Take Profit FX Ltd | Financial services | 2025 |
| Taketimeco Limited | Hospitality | 2026 |
| Talent Growth Transition Ltd | Education | 2024 |
| Talk & Survive Ltd | Health & social care | 2025 |
| Talktrade Ltd | Wholesale & retail | 2025 |
| Taller Food Limited | Hospitality | 2025 |
| Talukder Traders Ltd | Wholesale & retail | 2024 |
| Tamarind Dagenham Limited | Hospitality | 2025 |
| Tamboo Care Limited | Health & social care | 2015 |
| Tanase TNS Ltd | Transport & logistics | 2026 |
| Tania Smith's Unisex Salon Limited | Extraterritorial | 2015 |
| Tanzanite Healthcare Group Ltd | Health & social care | 2024 |
| Tapnfix Ltd | Construction | 2019 |
| Taqwa Properties Limited | Real estate | 2022 |
| Tara Textile Ltd | Wholesale & retail | 2022 |
| Taramis Investments Ltd | Real estate | 2019 |
| Tariffwize Limited | Professional & scientific | 2025 |
| Tarqex Ltd | Wholesale & retail | 2026 |
| Tartak Interiors Limited | Administrative & support | 2014 |
| Tasconstruct Ltd | Construction | 2023 |
| Taseen Ltd | Real estate | 2020 |
| Taste a Treat Ltd | Hospitality | 2025 |
| Tasty Kabab Dagenham Ltd | Hospitality | 2019 |
| Tasty Point Ltd | Hospitality | 2022 |
| Tastyco Limited | Hospitality | 2025 |
| TAT Haulage Ltd | Transport & logistics | 2017 |
| Tatiana Touch Ltd | Wholesale & retail | 2020 |
| TAU Construction Ltd | Construction | 2016 |
| TAU Property Investments Ltd | Real estate | 2016 |
| Taurus 4 ALL Limited | Hospitality | 2023 |
| Taurus Care Ltd | Health & social care | 2018 |
| Tautkus Carpentry Ltd | Construction | 2026 |
| Tavica Services Limited | Other services | 2018 |
| Tawhid Academy Limited | Education | 2016 |
| Tax Accountant Direct Ltd | Professional & scientific | 2026 |
| Tax Root Ltd | Information & communication | 2025 |
| Taxi Service Ongar Ltd | Transport & logistics | 2024 |
| Taxsol Ltd | Professional & scientific | 2022 |
| Taxwise Consultancy Ltd | Professional & scientific | 2021 |
| Taya Construction Limited | Construction | 2020 |
| Taya Group Estates Limited | Administrative & support | 2021 |
| Taye & Sons Ltd | Information & communication | 2018 |
| Taylor Made Baby’S Ltd | Wholesale & retail | 2025 |