| South East Stays Ltd | Hospitality | 2022 |
| South East Systems Ltd | Construction | 2021 |
| South England, London & Kent Ambulance Service Ltd | Health & social care | 2025 |
| Southbank Flooring Ltd | Construction | 2017 |
| Southern Hvac Ltd | Energy | 2025 |
| Southlands Properties Ltd | Construction | 2013 |
| Southwell Plasterers Limited | Construction | 2003 |
| SP Vinyl Supplies Limited | Wholesale & retail | 2019 |
| Spartan Ives Limited | Wholesale & retail | 2021 |
| Spectrum Automotive Limited | Manufacturing | 2009 |
| Spectrum Elevators Ltd | Professional & scientific | 2024 |
| Spencer Clarke Financial Services Ltd | Financial services | 2010 |
| Spennacchi Catering Limited | Wholesale & retail | 2024 |
| SPF Electrical Services Limited | Construction | 2024 |
| Sphere Holdings Ltd | Financial services | 1999 |
| Spices & Herbs Company Ltd | Wholesale & retail | 2023 |
| Spitfire Cafe Limited | Hospitality | 2013 |
| Spliethoff-Biglift UK Ltd | Transport & logistics | 1992 |
| Sportacus Ltd | Arts & recreation | 2012 |
| Sports 4 Skools Ltd | Education | 2023 |
| Spring Shaw Ltd | Health & social care | 2022 |
| Springbook Accounts Ltd | Professional & scientific | 2023 |
| SPS Plumbing & Heating Ltd | Construction | 2025 |
| Squerryes Limited | Wholesale & retail | 2019 |
| Squires Space & Solutions Ltd | Construction | 2024 |
| SS Rail Limited | Construction | 2014 |
| Sshh Limited | Professional & scientific | 2022 |
| SSW Restaurant Ltd | Hospitality | 2024 |
| ST Margaret’S Electrical Enterprises Ltd | Construction | 2023 |
| ST Tropez Limited | Real estate | 2006 |
| Stacey Investments Ltd | Real estate | 2022 |
| Stanfredtransport Ltd | Transport & logistics | 2025 |
| Stanzavisuals Ltd | Wholesale & retail | 2025 |
| Stays London Ltd | Real estate | 2023 |
| Steam-Tech Environmental Limited | Administrative & support | 2013 |
| Steamx Holdings Limited | Financial services | 2021 |
| Steel Craft Scaffolding Ltd | Construction | 2022 |
| Stephens Legal Services Limited | Professional & scientific | 2006 |
| Sterling Chase Surveys Limited | Other services | 2026 |
| Steve Sims Consulting Limited | Information & communication | 2014 |
| Steven Flight Ltd | Construction | 2025 |
| Stonefields Property Management Ltd | Real estate | 2026 |
| Stothert Ltd. | Information & communication | 2017 |
| Strand Construction and Development Limited | Real estate | 1985 |
| Streamline Hospital Cars Limited | Transport & logistics | 2009 |
| Streets Property Ltd | Real estate | 2021 |
| Stringer Court Company Limited(The) | Real estate | 1981 |
| STROGA4SPORT Limited | Arts & recreation | 2018 |
| Strong Origin Fitness Limited | Arts & recreation | 2024 |
| Strong Origin Sgpt Limited | Arts & recreation | 2024 |
| Studio 303 Ltd | Professional & scientific | 2003 |
| Sublime Property Investments Ltd | Real estate | 2020 |
| Suffolk Carpentry UK Limited | Construction | 2009 |
| Sullivan Stone Ltd | Construction | 2025 |
| Summerfields Limited | Hospitality | 2001 |
| Sunningvale Aesthetics Practice Holding Limited | Financial services | 2026 |
| Sunningvale Aesthetics Practice Limited | Health & social care | 2017 |
| Sunningvale Contractors Ltd | Construction | 2014 |
| Sunny Side Motors Limited | Wholesale & retail | 2022 |
| Sunshine Promotions Limited | Professional & scientific | 1987 |
| Supajam Education in Music and Media Limited | Education | 2013 |
| Supajam Limited | Administrative & support | 2006 |
| Supapower Ltd | Arts & recreation | 2019 |
| Supercar Italia Ltd. | Wholesale & retail | 2014 |
| Surrey & Kent Flying Club Limited | Transport & logistics | 1998 |
| Surrey Plumbing Services Limited | Construction | 2010 |
| Surrey Street Hire and Sales Ltd | Administrative & support | 2011 |
| Sustained Supplies Ltd | Professional & scientific | 2025 |
| Sutherland Ridge Management Company Limited | Households | 1994 |
| Sutton Aviation Services Ltd | Manufacturing | 2026 |
| Sutton Gardens Limited | Administrative & support | 2007 |
| Swallowtail Studio Ltd | Manufacturing | 2026 |
| Swan Place Land Ltd | Real estate | 2012 |
| Swan Place Management Limited | Households | 2008 |
| Swapz Limited | Information & communication | 2001 |
| Sweet Memories of Twickenham Ltd | Wholesale & retail | 2009 |
| Swift Tax Rebates Ltd | Professional & scientific | 2017 |
| Swiftprint Limited | Real estate | 2011 |
| SWS Hire UK Ltd | Construction | 2025 |
| Synergict Connect Ltd | Information & communication | 2005 |
| Synergict Eco Concept Ltd | Other services | 2020 |
| Synergyx Limited | Professional & scientific | 2023 |
| T Youseman Limited | Administrative & support | 2016 |
| T&D Glazing Solutions Ltd | Construction | 2018 |
| T.Decs Building & Decorating Limited | Construction | 2006 |
| T2 NMJ Ltd | Real estate | 2019 |
| Tactical Overview Ltd | Professional & scientific | 2022 |
| Tails of Westerham Limited | Other services | 2014 |
| Talk of the Town London Ltd | Administrative & support | 2009 |
| Tampd Ltd | Information & communication | 2023 |
| Tandridge Plumbing & Heating Limited | Administrative & support | 2015 |
| Tandridge Plumbing Limited | Professional & scientific | 2017 |
| Tasty VIE Limited | Hospitality | 2025 |
| Tateamber Ltd | Real estate | 2025 |
| Tatsfield Aquatics and Landscaping Ltd | Administrative & support | 2024 |
| Tawny Place Management Company Limited | Households | 2024 |
| Tax and Trust Solutions Limited | Real estate | 1992 |
| Taylor Brothers LDN Limited | Construction | 2016 |
| TCP Building and Development Limited | Construction | 2019 |
| TD Property Maintenance Services Ltd | Administrative & support | 2017 |