| Stephens Engineering Automatics Limited | Wholesale & retail | 2008 |
| Sterling ITC Limited | Information & communication | 2014 |
| Steve B Consulting Ltd | Construction | 2018 |
| Steven Drew Creative Ltd | Administrative & support | 2024 |
| Stevens Surveying & Consultancy Services Ltd | Professional & scientific | 2018 |
| STM Technical Ltd | Professional & scientific | 2019 |
| Stonehall Investments Limited | Construction | 2002 |
| Stoneserv Management Ltd | Construction | 2013 |
| Stoneways Gardens Ltd | Construction | 2024 |
| Stonyhills Wellness Ltd | Health & social care | 2026 |
| Storm Leasing Limited | Financial services | 2020 |
| Storm Tourism Limited | Administrative & support | 2013 |
| Stort Mill Garage Limited | Wholesale & retail | 2004 |
| Stort Mill Recovery Limited | Extraterritorial | 2010 |
| Stortview Limited | Real estate | 2001 |
| Strama Holdings Limited | Construction | 2023 |
| Strata Sports Management Limited | Arts & recreation | 1985 |
| Stratford Place Utilities Holdings Limited | Financial services | 2018 |
| Stratford Place Utilities Limited | Energy | 2017 |
| Streamwire Group Limited | Financial services | 2016 |
| Strictly Good Vibes (SGV) Limited | Wholesale & retail | 2020 |
| Striqe Ltd | Professional & scientific | 2022 |
| Strong Presence Limited | Professional & scientific | 2012 |
| Structen Engineering Ltd | Manufacturing | 2024 |
| Structure Construction Ltd | Manufacturing | 2025 |
| Studio Enea Ltd | Education | 2026 |
| Styrning House Publishing Limited | Information & communication | 2025 |
| SUB Hero Limited | Wholesale & retail | 2025 |
| Successful Candidates Limited | Administrative & support | 2019 |
| Succession Ventures Ltd | Professional & scientific | 2023 |
| Sugar and Scoop Ltd | Wholesale & retail | 2020 |
| Summerfield Contractors Ltd | Professional & scientific | 2026 |
| Summit Residential Ltd | Construction | 2024 |
| Sunlec Ltd | Construction | 2018 |
| Sunny Hill Projects Limited | Real estate | 2019 |
| Sunscribe Limited | Construction | 2026 |
| Sunstopper Blinds Limited | Wholesale & retail | 2001 |
| Supaclean Maintenance Cleaning Ltd | Administrative & support | 2022 |
| Super Soccer School Limited | Education | 2017 |
| Super Ware Ltd | Hospitality | 2019 |
| Super-Sub Connect Ltd | Professional & scientific | 2025 |
| Supreme Carriages Ltd | Arts & recreation | 2022 |
| Surtees and Company Ltd | Professional & scientific | 2025 |
| Sustain Energy Solutions Limited | Construction | 2011 |
| Sustainable Transformation Ltd | Professional & scientific | 2018 |
| Suzie Sheep Shop Ltd | Manufacturing | 2020 |
| Suzio Ltd | Wholesale & retail | 2014 |
| SV Salvage Ltd | Wholesale & retail | 2018 |
| SWC Asset Services Limited | Administrative & support | 2024 |
| Swco Financial Planning Limited | Professional & scientific | 2012 |
| SWE Consultants Limited | Information & communication | 2011 |
| Sweeney Construction London Limited | Construction | 2022 |
| Sweet Delivery Limited | Wholesale & retail | 2020 |
| Sworders Agricultural Commercial and Residential Limited | Professional & scientific | 2018 |
| Sydney MAY Crouch Limited | Information & communication | 2021 |
| Synectics Medical Limited | Manufacturing | 2014 |
| Synergy Purchasing Ltd | Information & communication | 2024 |
| Synmed Ltd | Wholesale & retail | 2020 |
| T C Vale GAS Boiler Spec Limited | Construction | 2025 |
| T G Electrics London Limited | Construction | 2013 |
| T P Garden Care Ltd | Other services | 2020 |
| T&S Richardson Investment Company Limited | Other services | 2026 |
| T.S Oakley Stores UK Ltd | Wholesale & retail | 2025 |
| Tadbeer Ltd | Other services | 2021 |
| Taipan Capital Limited | Financial services | 2019 |
| Take 12 Media Ltd | Information & communication | 2021 |
| Takeley Commercial Park Limited | Real estate | 2020 |
| Talaco Ltd | Professional & scientific | 2019 |
| Talbot Fitness Ltd | Other services | 2024 |
| Talent Frame Limited | Administrative & support | 2022 |
| Talo Studios London Limited | Professional & scientific | 2026 |
| Tappenden & Co. Limited | Professional & scientific | 1990 |
| Taps More Like IT Ltd | Construction | 2025 |
| Tarnold Consulting Limited | Professional & scientific | 2023 |
| Taybur Construction Limited | Construction | 2013 |
| Taycon Properties Limited | Real estate | 2025 |
| Taylor Consulting Solutions Ltd | Professional & scientific | 2023 |
| Taylor Lacey Ltd | Administrative & support | 2019 |
| Taylor Phelps Ltd | Real estate | 2019 |
| Taylored Technology Consulting Limited | Information & communication | 2023 |
| TB Jewellers Ltd | Wholesale & retail | 2025 |
| Tbpachura Ltd | Construction | 2018 |
| TCS Transport Compliance Services Ltd | Transport & logistics | 2014 |
| TDB Fabrication Ltd | Manufacturing | 2023 |
| TDF Properties Ltd | Real estate | 2026 |
| TDS Plumbing Services Limited | Construction | 2020 |
| Tea on the LEA Ltd | Hospitality | 2021 |
| Tealicious Limited | Wholesale & retail | 2011 |
| Teamcharlesbarclay Ltd | Education | 2020 |
| Tech Connect Ltd | Information & communication | 2026 |
| Tech Sourcing Solutions Ltd | Information & communication | 2018 |
| Techart 3D Ltd | Professional & scientific | 2018 |
| Techform Limited | Construction | 2011 |
| Technical Packaging Services Ltd | Professional & scientific | 2023 |
| Technical Plus Rentals Ltd | Real estate | 2021 |
| Teestraces Ltd | Wholesale & retail | 2023 |
| Temi Johnson Design Ltd | Professional & scientific | 2022 |
| Tenbyfield Limited | Manufacturing | 1983 |
| Terrafirma Contracts Roofing Limited | Construction | 2022 |
| Terrafirma Eco Solutions Ltd | Construction | 2024 |