| ST Margarets Plumber Ltd | Construction | 2020 |
| ST. Alban Tower Ltd | Real estate | 1998 |
| Stag Road Limited | Households | 2016 |
| Stanley 150, 150A & 150C Ltd | Households | 2025 |
| Stanley RD 2025 A-D Freehold Ltd | Households | 2025 |
| Stanley Road Joinery Ltd | Construction | 2023 |
| Starlight Projects Ltd | Construction | 2018 |
| Steam PM Ltd | Professional & scientific | 2020 |
| Steel Studios Limited | Real estate | 2026 |
| Steinerwestling (Design, Construction & Consulting) Ltd | Professional & scientific | 2023 |
| Stella Alexander Limited | Professional & scientific | 2017 |
| Stephen Court Limited | Households | 2004 |
| Stepping on OUT | Manufacturing | 2005 |
| Sterling Moves Ltd | Transport & logistics | 2018 |
| Sterling Oak Ventures Ltd | Financial services | 2024 |
| Steve Building Services Ltd | Construction | 2024 |
| Steve Elphick Associates Ltd | Construction | 2009 |
| Stillnight Labs Limited | Wholesale & retail | 2026 |
| Stingray Marketing and Communications Limited | Administrative & support | 1998 |
| Stirling Media Limited | Information & communication | 2013 |
| Stonell Limited | Wholesale & retail | 2012 |
| Stoppard Energy Ltd | Professional & scientific | 2025 |
| Storycraft Limited | Information & communication | 2016 |
| Strategic Consultants Limited | Professional & scientific | 2016 |
| Strategic Consulting Group International Limited | Administrative & support | 2009 |
| Strategy by Design Limited | Information & communication | 2016 |
| Stratton Wentworth Limited | Real estate | 2018 |
| Stratum C & T Limited | Professional & scientific | 2023 |
| Strawberry Global Technology Limited | Information & communication | 1999 |
| Strawberry Patch Radnor Limited | Hospitality | 2024 |
| Street Food Catering Ltd | Hospitality | 2019 |
| Striped Leopard Limited | Professional & scientific | 2005 |
| Structurus Limited | Information & communication | 2016 |
| Studio 148 Limited | Wholesale & retail | 2011 |
| Studio 6IX Limited | Information & communication | 2017 |
| Studio Casa 9 Ltd | Professional & scientific | 2025 |
| Studio Gibson Limited | Manufacturing | 2022 |
| Studio Maison Ltd | Professional & scientific | 2025 |
| Studio Pike Ltd. | Professional & scientific | 2015 |
| Studio Room Creative Limited | Professional & scientific | 2025 |
| Studiohaycock Ltd | Professional & scientific | 2020 |
| Style DI Vita Ltd | Wholesale & retail | 2019 |
| Subhi Consultancy Services Limited | Information & communication | 2007 |
| Subhi Properties Ltd | Real estate | 2018 |
| Submitandgo Ltd | Information & communication | 2016 |
| Sugarshaker Enterprises Limited | Information & communication | 2008 |
| Sulus Ltd | Transport & logistics | 2024 |
| Sumwot Digital Ltd | Professional & scientific | 2018 |
| Sunshine Yellow Marketing Ltd | Professional & scientific | 2026 |
| Super Style Ltd | Other services | 2026 |
| Supreme Carpet Solutions Ltd | Construction | 2025 |
| Supreme Delta Ltd | Information & communication | 2015 |
| Surbiton Court Residents Association Limited | Households | 1964 |
| Surrey Air-Conditioning Limited | Construction | 2000 |
| Susan M Burrows Limited | Health & social care | 2014 |
| Susita Thai Spa Ltd | Health & social care | 2024 |
| Sustainable Technology Consulting Limited | Professional & scientific | 2008 |
| SW Waste Solutions Ltd | Water & waste | 2024 |
| SWF Consultancy Limited | Information & communication | 2008 |
| Swharris Associates Ltd | Professional & scientific | 2020 |
| SWS Music Limited | Education | 2012 |
| Sxaler Ltd | Professional & scientific | 2023 |
| Sybar Ltd | Wholesale & retail | 2019 |
| Synchromation Ltd | Information & communication | 2023 |
| Synergy (Construction Consulting) Limited | Construction | 2010 |
| T K Building & Construction Ltd | Construction | 2014 |
| T.K. Marketing Limited | Hospitality | 1991 |
| T.Park Freehold Ltd | Professional & scientific | 2019 |
| T4 Living Ltd | Real estate | 2020 |
| Tacet Ltd | Information & communication | 2022 |
| Tadtree Holdings Limited | Financial services | 2024 |
| Taggs Management Limited | Households | 2022 |
| Tailoring & DRY Cleaning Ltd | Other services | 2021 |
| Tailormadetravelforyou Ltd | Administrative & support | 2025 |
| Takd Ltd | Hospitality | 2022 |
| Talking Bird Productions Ltd | Arts & recreation | 2025 |
| Tamesis Club Limited | Arts & recreation | 2019 |
| Tamesis House (Manor Road) Residents Association Limited | Households | 1998 |
| TAP Inc Limited | Financial services | 2019 |
| Tara Services Limited | Professional & scientific | 2016 |
| Tarator Limited | Information & communication | 2023 |
| Tatlers LLP | | 2002 |
| Tavoy Consulting Ltd | Professional & scientific | 2010 |
| TAW Finance Limited | Financial services | 2015 |
| Taylor Wentworth Limited | Hospitality | 1999 |
| Taylormadebuilding Services Teddington Limited | Construction | 2023 |
| TDT Construction Management Limited | Construction | 2021 |
| Teaching by the Top Ltd | Education | 2015 |
| Tecdura Group (UK) Ltd | Construction | 2011 |
| Techedge Consultancy Limited | Administrative & support | 2016 |
| Technical Talent Limited | Administrative & support | 2023 |
| Techyard Limited | Information & communication | 2019 |
| Tecno International Ltd | Professional & scientific | 2022 |
| Tedd Properties Limited | Real estate | 2017 |
| Teddifornia Automotive Limited | Real estate | 2024 |
| Teddington Berts Shoe Repairs Limited | Other services | 2026 |
| Teddington Brasserie Ltd | Hospitality | 2025 |
| Teddington DRY Cleaner and Tailoring Ltd | Other services | 2024 |
| Teddington Gate Limited | Households | 2024 |
| Teddington Lodge Limited | Hospitality | 2013 |