| Super Tax Ltd | Professional & scientific | 2026 |
| Super Trims Global Limited | Other services | 2020 |
| Superior Single PLY Ltd | Construction | 2014 |
| Suppress Limited | Construction | 2017 |
| Supreme Autocraft Ltd | Wholesale & retail | 2024 |
| Supreme Consultation Ltd | Hospitality | 2024 |
| Supreme Guarding Services Limited | Hospitality | 2013 |
| Suresh Assets Ltd | Real estate | 2023 |
| Sustainable Solutions Services Limited | Professional & scientific | 2024 |
| Sutton Road Holdings Limited | Real estate | 2025 |
| SW Vision Ltd | Health & social care | 2023 |
| Swan Accounting Services Ltd | Professional & scientific | 2014 |
| Swan Property Services Ltd | Real estate | 2017 |
| Swankeys Property Management Limited | Real estate | 2022 |
| Swapna's Hair, Laser and Aesthetics Clinic Ltd | Other services | 2022 |
| SWC Window Cleaning Services Ltd | Administrative & support | 2021 |
| Sweetsomethings EST 2020 Limited | Manufacturing | 2024 |
| Sweft Ltd | Information & communication | 2020 |
| Swift Logistics UK Limited | Transport & logistics | 2005 |
| Sydney Construction & Home Improvements Limited | Construction | 2016 |
| Sydney Home Solutions Ltd | Construction | 2024 |
| Syllak Limited | Health & social care | 2022 |
| Sylstore Ltd | Wholesale & retail | 2022 |
| Synergy Enterprise Solutions Limited | Professional & scientific | 2011 |
| Synergy Management (UK) Limited | Information & communication | 2013 |
| Syphax Consultancy Ltd | Professional & scientific | 2025 |
| SÓ COM SAL Limited | Real estate | 2025 |
| T & D Ventilations Ltd | Construction | 2011 |
| T Money Limited | Information & communication | 2015 |
| T R Herbie Ltd | Construction | 2025 |
| T&T Associates London Limited | Professional & scientific | 2014 |
| T&T UK Trading Limited | Wholesale & retail | 2024 |
| T.L Wholesale Ltd | Wholesale & retail | 2023 |
| TA Car Body Work Limited | Wholesale & retail | 2024 |
| TAB Logistis Ltd | Information & communication | 2013 |
| Tadey & Co Ltd | Other services | 2018 |
| TAG Motors Ltd | Wholesale & retail | 2024 |
| TAG Traders Ltd | Construction | 2017 |
| Taha Academy 2.0 Ltd | Education | 2024 |
| Taha Academy 3.0 Ltd | Education | 2024 |
| Taha Academy Ltd | Education | 2020 |
| Tailored Futures CIC | Administrative & support | 2018 |
| Takolia Ltd | Health & social care | 2024 |
| Talbert Consultancy Ltd | Professional & scientific | 2022 |
| Talinor (UK) Ltd | Manufacturing | 2005 |
| Tamaris Indian Ltd | Hospitality | 2018 |
| Tamtor- Havantts Healthcare Consult Ltd | Administrative & support | 2023 |
| Tancraft Limited | Real estate | 2018 |
| Tangible Property Ltd | Real estate | 2024 |
| Tania & RAY Transport Ltd | Transport & logistics | 2025 |
| Tank Logistics Ltd | Transport & logistics | 2024 |
| Tanko UK Ltd | Transport & logistics | 2011 |
| Taoj Properties Ltd | Real estate | 2025 |
| Taqwa Hajj and Umrah Limited | Administrative & support | 2019 |
| Tasty Tweets Limited | Wholesale & retail | 2012 |
| Tata Trading Ltd | Wholesale & retail | 2023 |
| Tatar Construction Limited | Construction | 2023 |
| Tauras Management Limited | Real estate | 2018 |
| Taxstone Ltd | Administrative & support | 2026 |
| Taylor Middleton Limited | Construction | 2003 |
| Taylor Strasmore Limited | Administrative & support | 2019 |
| Tayyaba Bano Ltd | Administrative & support | 2017 |
| TB Decorating Ltd | Construction | 2015 |
| TCL Manufacturing Limited | Manufacturing | 1990 |
| Teacai Ltd | Information & communication | 2017 |
| Teacup Property Management Limited | Real estate | 2021 |
| Team Pallan Limited | Health & social care | 2014 |
| Tech Basket Ltd | Wholesale & retail | 2020 |
| Tech Q Media Limited | Professional & scientific | 2025 |
| Techaidbox Limited | Information & communication | 2014 |
| Technisal Ltd | Professional & scientific | 2023 |
| Techteev Ltd | Manufacturing | 2024 |
| Teco Interiors Limited | Construction | 1994 |
| Tee-Jam Management Limited | Arts & recreation | 2003 |
| Teekash Locum Limited | Health & social care | 2011 |
| Teeque Limited | Wholesale & retail | 2023 |
| Tehillah Services Ltd | Administrative & support | 2025 |
| Tejuno Limited | Information & communication | 2022 |
| Tekhive Ltd | Information & communication | 2021 |
| Tekinvesticom Limited | Construction | 2024 |
| Tender Healthcare Services Ltd | Administrative & support | 2015 |
| Tensif Consulting Ltd | Professional & scientific | 2025 |
| Terna Transport Limited | Transport & logistics | 2020 |
| Terra Nova Building Limited | Construction | 2024 |
| Tervo Investments Limited | Real estate | 2021 |
| TFN Properties Ltd | Construction | 2024 |
| Thaal Ltd | Wholesale & retail | 2025 |
| Thames Gateway Tramlink Ltd | Transport & logistics | 2018 |
| Thames Import Export Ltd | Wholesale & retail | 2021 |
| Thames Rugby Football Club Limited | Arts & recreation | 2011 |
| THE 7 Group Partnership Ltd | Real estate | 2023 |
| THE African Parent Ltd | Administrative & support | 2023 |
| THE Artisan Atelier Ltd | Arts & recreation | 2025 |
| THE Beloved Ministries Ltd | Other services | 2010 |
| THE Bike Club (Holdco) Limited | Financial services | 2026 |
| THE Bike Club Limited | Wholesale & retail | 2016 |
| THE Bite Box Kent Ltd | Hospitality | 2024 |
| THE Brand Adviser Ltd | Administrative & support | 2021 |
| THE Cakeryco Ltd | Manufacturing | 2025 |
| THE Car Shop Autocentre Limited | Wholesale & retail | 2019 |