| SQ Projects Ltd | Construction | 2025 |
| Squadra Limited | Construction | 2010 |
| Squadra Studio Ltd | Professional & scientific | 2026 |
| Squirrels (CSS) | Other services | 2002 |
| SRI Annamar Private Limited | Real estate | 2024 |
| Srjr Investments Limited | Real estate | 2015 |
| Srnj Technologies Ltd | Information & communication | 2014 |
| Srvt Consulting Ltd | Professional & scientific | 2021 |
| SS Health Limited | Information & communication | 2019 |
| ST Philips Financial Services Ltd | Financial services | 2026 |
| Stag Construction Solutions Limited | Construction | 2016 |
| Stage & General Co. Limited | Education | 2004 |
| Stallion Workforce Ltd | Administrative & support | 2026 |
| Starling Roofing Ltd | Construction | 2026 |
| Stay Home Ltd | Real estate | 2000 |
| Steercomm Limited | Professional & scientific | 2013 |
| Stephen WEY Editing Ltd | Information & communication | 2013 |
| Steps Flooring Limited | Construction | 2019 |
| Sterling Chauffeur Ltd | Transport & logistics | 2019 |
| Stitch Right Limited | Manufacturing | 2022 |
| Strat Court (Wimbledon) Co. Limited | Households | 1976 |
| Strata Bar Limited | Manufacturing | 2026 |
| Structural Design Bureau Ltd | Professional & scientific | 2011 |
| Studio 95 Ltd | Arts & recreation | 2021 |
| Studio Earth Matters Limited | Construction | 2026 |
| Studio OH EM GEE Ltd | Professional & scientific | 2021 |
| Style Maven Personal Styling Limited | Professional & scientific | 2025 |
| Suffolk RD Ltd | Real estate | 2020 |
| Sularis Ltd | Other services | 2023 |
| Sulehri Limited | Real estate | 2020 |
| Sumarey Limited | Health & social care | 2009 |
| Suna Communication Limited | Manufacturing | 2001 |
| Sunny Mart Limited | Wholesale & retail | 2011 |
| Super Booth Bros Ltd | Professional & scientific | 2021 |
| Surbiton Sigma Ltd | Real estate | 2022 |
| Surbiton Town Sports Club Limited | Arts & recreation | 1951 |
| Surrey Hills Home Care Limited | Information & communication | 2021 |
| Surrey Property Developers Limited | Construction | 2023 |
| Surrey Smart Scaffolding Limited | Construction | 2019 |
| Sustainer Ltd | Administrative & support | 2016 |
| Sutton Chamber of Commerce Limited | Other services | 1997 |
| Sutton Express Cars Ltd | Transport & logistics | 2026 |
| SV & M Contractors Limited | Construction | 2011 |
| Sv-Az Ltd | Wholesale & retail | 2023 |
| SVR Consulting Limited | Information & communication | 2016 |
| Swallow House Management Company Limited | Households | 1974 |
| Swann Martin Limited | Professional & scientific | 2008 |
| Swift Construction Surrey Ltd | Construction | 2018 |
| Swlhg Ltd | Health & social care | 2023 |
| SYC Group Limited | Real estate | 2026 |
| Syness Invest Ltd | Professional & scientific | 2025 |
| System Recruitment Specialists Limited | Administrative & support | 2009 |
| SYT Heating Ltd | Construction | 2018 |
| T & F Services Limited | Health & social care | 2009 |
| T Scaffolding Ltd | Construction | 2014 |
| Take TAN Ltd | Other services | 2026 |
| Talent Acquisition 1 Ltd | Administrative & support | 2024 |
| Tamil National Remembrance CIC | Arts & recreation | 2026 |
| Tamil Women International Network UK | Other services | 2025 |
| Tamina Limited | Other services | 2002 |
| Tanoor Cuisine Ltd | Hospitality | 2017 |
| Tanvi Properties Limited | Real estate | 2025 |
| Tanyaansh Homes Limited | Real estate | 2023 |
| TAP Financial Services (Commercial Finance) Ltd | Financial services | 2024 |
| Target Data Systems Limited | Information & communication | 1994 |
| Tarynne Quirk & Associates Ltd | Health & social care | 2018 |
| Tash Property Investments Limited | Real estate | 2024 |
| Tassie & Co Ltd | Professional & scientific | 2026 |
| Taste on Wheels LLP | | 2022 |
| Tax Affinity Ltd | Professional & scientific | 2021 |
| Tax Clarity Limited | Professional & scientific | 2009 |
| Taxicall Ltd | Information & communication | 2010 |
| Taxless (UK) Ltd | Professional & scientific | 2007 |
| TCA SP Ltd | Information & communication | 2025 |
| TE Change Management Solutions Ltd | Information & communication | 2024 |
| Techknowcranes Limited | Information & communication | 2013 |
| Technology Test Solutions Ltd | Information & communication | 2017 |
| Techwisely Ltd | Information & communication | 2017 |
| TEE Medicare Ltd | Health & social care | 2024 |
| TEE Zone Ltd | Arts & recreation | 2025 |
| Tendergift Limited | Real estate | 1997 |
| Terranavitas Ltd | Construction | 2024 |
| Terrashift Ltd | Transport & logistics | 2025 |
| Tetradec Limited | Real estate | 2021 |
| TG Drainage Limited | Construction | 2024 |
| Thai Village Spa Limited | Other services | 2014 |
| Thames Valley Studio Limited | Information & communication | 2025 |
| Thames.Ai Precision Engineering Ltd | Manufacturing | 2023 |
| Thamesflow Group Ltd | Households | 2026 |
| THE Avenue Financials Ltd | Professional & scientific | 2023 |
| THE Better Plumbing Company Limited | Construction | 2007 |
| THE Bridal Box Subscription Ltd | Wholesale & retail | 2020 |
| THE Cashew Apple Company Limited | Wholesale & retail | 2019 |
| THE Chef Restaurant Limited | Hospitality | 2024 |
| THE Chimney Stack Cafe Ltd | Manufacturing | 2026 |
| THE City Maintenance Team Limited | Administrative & support | 2000 |
| THE Dennington's (Worcester Park) Residents' Association Limited | Households | 1991 |
| THE Drop Fitness Limited | Arts & recreation | 2025 |
| THE Financial Foxes Ltd | Professional & scientific | 2023 |
| THE Global Forum Consulting Ltd | Professional & scientific | 2014 |