| Smart Card Software Limited | Information & communication | 2004 |
| Smart Inventory Providers Ltd | Administrative & support | 2012 |
| Smartec IT Consulting Ltd | Administrative & support | 2023 |
| Smith & Company Building Services Limited | Construction | 2004 |
| SNL Developments Limited | Construction | 2014 |
| SNL Rentals Limited | Real estate | 2019 |
| Snowdrop Healthcare Limited | Health & social care | 2019 |
| Sofa Access Limited | Other services | 2019 |
| Solera Advisory Limited | Professional & scientific | 2024 |
| Solid Future Homes Limited | Real estate | 2026 |
| Soloveychik and Co Limited | Professional & scientific | 2017 |
| Solstice Healthcare Ltd | Other services | 2023 |
| Solution Architecture Limited | Information & communication | 2022 |
| Soma Fit Ltd | Arts & recreation | 2021 |
| South East and London Electrical Ltd | Construction | 2024 |
| South East Fire Safety Limited | Public administration | 2012 |
| South Ridge Interiors Limited | Construction | 1985 |
| Southeast Bait Boats Ltd | Wholesale & retail | 2024 |
| Sovereign Security Systems Limited | Administrative & support | 2006 |
| Sovereign Services Kent Limited | Real estate | 2017 |
| Sovereign Services Property Holdings Limited | Real estate | 2020 |
| Spaces Property Investors Limited | Financial services | 2021 |
| SPB Accountancy LLP | | 2020 |
| Specialist Boiler Service Ltd | Construction | 2010 |
| Specific RX Limited | Manufacturing | 2025 |
| Spectrum Electrical Projects Ltd | Construction | 2019 |
| Speedy Draughting Limited | Professional & scientific | 2007 |
| Spice Swanley Limited | Hospitality | 2026 |
| SPINCAPTURE360 Ltd | Professional & scientific | 2026 |
| SPORTS100 Ltd | Information & communication | 2016 |
| Spotlight Management and Consultancy Limited | Professional & scientific | 2010 |
| Springtree Properties Limited | Wholesale & retail | 2002 |
| SPS Private Ltd | Real estate | 2024 |
| Square Pipe Property Ltd | Financial services | 2020 |
| SR Honor Oak Limited | Real estate | 2021 |
| Sriya Associates Limited | Administrative & support | 2011 |
| SRP Fire Safety Ltd | Administrative & support | 2017 |
| Ssscaffolding Limited | Construction | 2020 |
| ST James Gate Ltd | Households | 2017 |
| Stanhope Brasted Ltd | Hospitality | 2020 |
| Starbridge Limited | Professional & scientific | 2021 |
| Startech Communications Limited | Information & communication | 2016 |
| Starz Risk Solutions Limited | Information & communication | 2015 |
| Steffan Jones Lighting Ltd | Administrative & support | 2012 |
| Stem Renovations Ltd | Construction | 2025 |
| Sterling Property Ventures (103) Limited | Construction | 2014 |
| Sterling Property Ventures (Asset and Development Management) Limited | Real estate | 2022 |
| Sterling Property Ventures (MK) Limited | Construction | 2016 |
| Sterling Property Ventures Limited | Real estate | 2012 |
| Steve's Garden Landscapes Limited | Other services | 2019 |
| Stinex Ltd | Real estate | 2011 |
| Stobart Engineering Limited | Construction | 2012 |
| Stone Restore X Ltd | Construction | 2024 |
| Stone Roofing Limited | Construction | 2020 |
| Stravenue Limited | Administrative & support | 2023 |
| Strickland & Co Estate Agents Ltd. | Real estate | 2017 |
| Strong Shield Fire Doors Ltd | Manufacturing | 2024 |
| Studio Alma Design Limited | Arts & recreation | 2021 |
| Styleprint Driveways Limited | Construction | 2020 |
| Sunev & Co. Ltd | Information & communication | 2026 |
| Sunrise Childcare Services Ltd | Health & social care | 2021 |
| Surrey County Skips Ltd | Water & waste | 2012 |
| Surrey Wills and Probate Services Ltd | Professional & scientific | 2023 |
| SVO Limited | Professional & scientific | 2020 |
| Swain Property Acquisitions Limited | Real estate | 2021 |
| Swan Electrical Systems Limited | Construction | 2011 |
| Swan House Clearance Ltd | Transport & logistics | 2022 |
| Swan Mill (Holdings) Limited | Professional & scientific | 1930 |
| Swan Mill Paper Company Limited | Manufacturing | 1983 |
| Swan Refurbishment Limited | Construction | 2009 |
| Swanley Car Wash Ltd | Administrative & support | 2021 |
| Swanley Foot Care Ltd | Health & social care | 2025 |
| Swanley Performance LAB Ltd | Arts & recreation | 2019 |
| Swanley Plumbing Services Limited | Construction | 2025 |
| Swanley RFC Limited | Arts & recreation | 2017 |
| Swanley Therapy Centre (S.U.M.S) | Health & social care | 1989 |
| Swanley VC Ltd | Professional & scientific | 2024 |
| Sweet Home Estates Ltd | Real estate | 2017 |
| Sweets for My Sweet Limited | Hospitality | 2009 |
| Swim With Crest Limited | Education | 2023 |
| Swimstylers Limited | Arts & recreation | 2016 |
| Switchcom Ltd | Information & communication | 2017 |
| SWM UK Wind One Limited | Energy | 2009 |
| SYLHET2020 Ltd | Hospitality | 2019 |
| T a Green Roofing Limited | Construction | 2014 |
| T Duncan Air Conditioning Limited | Construction | 2026 |
| T Parr Holdings Ltd | Professional & scientific | 2024 |
| T&F Scaffolding Ltd | Construction | 2026 |
| T.B.B. Building Services Limited | Construction | 2008 |
| T.C & D Construction Ltd. | Construction | 2006 |
| T.R.K London Limited | Wholesale & retail | 2024 |
| T5 Alex Drylining Ltd | Other services | 2014 |
| Tableforge Limited | Information & communication | 2026 |
| Tailored Ceilings Limited | Construction | 2016 |
| Talent Crew Limited | Administrative & support | 2004 |
| Talent Motion Limited | Administrative & support | 2018 |
| Talison Prop Co Limited | Real estate | 2022 |
| Talison Taxis Ltd | Transport & logistics | 2019 |
| Talking Pictures Cards Limited | Extraterritorial | 1989 |
| Tallis Paper Limited | Manufacturing | 2011 |