| Sugarfina Time Ltd | Wholesale & retail | 2023 |
| Sugg Films Limited | Information & communication | 2006 |
| Sugg Fitness Ltd | Education | 2023 |
| Sujin Limited | Wholesale & retail | 2015 |
| Sumner for Hire Limited | Wholesale & retail | 2022 |
| Sundown Agency Ltd | Professional & scientific | 2024 |
| Sunrise and Sea Monsters Ltd | Wholesale & retail | 2024 |
| Sunrise Performance Solutions Ltd | Mining & quarrying | 2026 |
| Sunshine & Ravioli Cafe Deli Limited | Hospitality | 2018 |
| Super Structures Associates Limited | Construction | 2011 |
| Superglobal Ltd | Wholesale & retail | 2023 |
| Superior Beauty Studio Limited | Other services | 2026 |
| Superior Filtration Limited | Wholesale & retail | 2002 |
| Superior Letting Management Company Ltd | Real estate | 2016 |
| Superior Properties Solutions Ltd | Construction | 2026 |
| Surain Estates Limited | Real estate | 2023 |
| Surain Ltd | Wholesale & retail | 2022 |
| Surrey Formwork Ltd | Construction | 2004 |
| Surrey Groundwork Service Ltd | Construction | 2024 |
| Surrey Locums Limited | Health & social care | 2012 |
| Sushi Fridays Ltd | Hospitality | 2026 |
| Sushi Point Twickenham Ltd | Wholesale & retail | 2023 |
| Sustain Estates Ltd | Construction | 2025 |
| Sustainable Abodes Limited | Real estate | 2020 |
| Sustainable Assets Ltd | Professional & scientific | 2018 |
| Sustainable Avenues Limited | Professional & scientific | 2009 |
| Sutton Mews Limited | Households | 2004 |
| SV Aesthetics Ltd | Other services | 2018 |
| SV Legal Services Ltd. | Professional & scientific | 2012 |
| SV Legal Services(Non-Uk) Ltd | Professional & scientific | 2025 |
| Sv's Kusuma Ltd | Real estate | 2023 |
| Swag Solutions Ltd | Transport & logistics | 2025 |
| Swan Island Harbour Limited | Transport & logistics | 2012 |
| Swan News Ltd | Wholesale & retail | 2022 |
| Swansong Properties Limited | Real estate | 2007 |
| Sweet Memories 4 U Limited | Wholesale & retail | 2014 |
| Sweez Limousine Limited | Transport & logistics | 2016 |
| SWL Editorial Ltd | Information & communication | 2017 |
| Sycamore House (Twickenham) RTM Company Limited | Households | 2016 |
| Symbionix AI Ltd | Information & communication | 2026 |
| Synagise Limited | Health & social care | 2012 |
| Synchrony Limited | Wholesale & retail | 2023 |
| Synergy Healthcare Services Ltd | Administrative & support | 2016 |
| Synergy Healthtech Ltd | Information & communication | 2025 |
| Synerza Limited | Professional & scientific | 2024 |
| System One Consulting Limited | Professional & scientific | 2015 |
| Söpö Espresso Limited | Wholesale & retail | 2024 |
| T a H Construction Ltd | Construction | 2020 |
| T and T Removals Limited | Transport & logistics | 2025 |
| T Brentnall Project Management Limited | Administrative & support | 2017 |
| T W Building and Construction Ltd | Construction | 2020 |
| T&S Autos Limited | Manufacturing | 2008 |
| T-Bird Sports Ltd | Arts & recreation | 2021 |
| T-Studio Ltd | Arts & recreation | 2018 |
| T.I.D International Ltd | Administrative & support | 2018 |
| T.Tatulis Limited | Construction | 2019 |
| T2 Design and Consulting Limited | Professional & scientific | 2024 |
| TA 2 Pawel Limited | Arts & recreation | 2020 |
| Tabletop Hobby Ltd | Wholesale & retail | 2026 |
| Tail Shield Holdings Ltd | Financial services | 2025 |
| Talent Advantage Ltd | Professional & scientific | 2014 |
| Talent on Demand Ltd | Administrative & support | 2022 |
| Taltrabs Holdings Ltd | Financial services | 2025 |
| Talwar Limited | Wholesale & retail | 2009 |
| Tamana R Ltd | Health & social care | 2025 |
| Tambo Travel Ltd | Administrative & support | 2015 |
| Tamsan Limited | Other services | 2016 |
| Tang Invest Ltd | Professional & scientific | 2018 |
| Tangram Interactive Limited | Professional & scientific | 2012 |
| Tania Johnson Design Ltd | Manufacturing | 2015 |
| Tanya Joseph Consulting Ltd | Professional & scientific | 2011 |
| Taocc Limited | Households | 1973 |
| Tapron Limited | Wholesale & retail | 2016 |
| Taran & Sons Trading Group Ltd | Wholesale & retail | 2021 |
| Target Group Holdings Ltd | Real estate | 2025 |
| Tasso Talking Therapy Limited | Health & social care | 2024 |
| TAT2ING Ltd | Other services | 2019 |
| Taylor Cornerstone Consulting Limited | Information & communication | 2026 |
| Tays Property Ltd | Real estate | 2017 |
| Taytech Engineering Limited | Manufacturing | 2022 |
| Taza Construction's Ltd | Information & communication | 2021 |
| Tbel Ltd | Wholesale & retail | 2026 |
| TC Grill Limited | Hospitality | 2021 |
| TC Music Limited | Arts & recreation | 2017 |
| TCM Partners Limited | Information & communication | 2003 |
| TDG International Ltd | Education | 2023 |
| Teach Engineering & Technology Solutions Ltd | Education | 2018 |
| Teacher School Search UK Limited | Administrative & support | 2024 |
| Team Heat Ltd | Construction | 2018 |
| Team-Adhd/Asd Ltd | Health & social care | 2025 |
| Tease Hair Design Limited | Other services | 2017 |
| Tech 21 Licensing Limited | Professional & scientific | 2006 |
| Tech 21 UK Limited | Manufacturing | 2005 |
| Tech Ahoy Limited | Administrative & support | 2012 |
| Technical Team Systems Limited | Extraterritorial | 1998 |
| Technical Testing and Services Limited | Professional & scientific | 2015 |
| Technobae Limited | Information & communication | 2025 |
| Techstrategies Ltd | Professional & scientific | 2025 |
| Techzone M Ltd | Other services | 2020 |
| Tectonic Productions Ltd | Information & communication | 2026 |