| Silverfort Limited | Real estate | 2022 |
| SIMBA2020 Limited | Professional & scientific | 2024 |
| Simdycate Consulting Ltd | Professional & scientific | 2022 |
| Simdycate Limited | Information & communication | 2022 |
| SJ Squad Limited | Information & communication | 2022 |
| SJH Installations Limited | Construction | 2014 |
| Skelton Project Management Limited | Professional & scientific | 2016 |
| Skin-C Limited | Health & social care | 2023 |
| Skyline Canopies Ltd | Professional & scientific | 2025 |
| Skyynlab Limited | Health & social care | 2025 |
| Slater Associates Ltd | Administrative & support | 2019 |
| Slattery's Consultancy Limited | Professional & scientific | 2017 |
| Slice Consultancy Limited | Information & communication | 2023 |
| Slingback Ltd | Information & communication | 2025 |
| Smair Limited | Construction | 2025 |
| Small Bacteria Ltd | Wholesale & retail | 2025 |
| SME Needs Limited | Professional & scientific | 2011 |
| Smith Financial Services Limited | Financial services | 2018 |
| Smithwood Consulting Limited | Other services | 2009 |
| Smoking PEN Ltd | Professional & scientific | 2012 |
| Snappy Photos Ltd | Professional & scientific | 2008 |
| Snowmast Limited | Information & communication | 2016 |
| Snowy Construction Ltd | Manufacturing | 2023 |
| SO SHE Says Management Ltd | Administrative & support | 2025 |
| Sods Consultancy Limited | Professional & scientific | 2025 |
| Solaris Market Research Ltd | Professional & scientific | 2019 |
| Solomon and Solomon Ltd | Health & social care | 2015 |
| Sonder Insights Limited | Information & communication | 2018 |
| Sonic Business Systems Limited | Information & communication | 1997 |
| Sophie Clyde Ltd | Arts & recreation | 2025 |
| Sophie Gunyon Ltd | Professional & scientific | 2024 |
| Sophie Leang Consulting Ltd | Professional & scientific | 2026 |
| Soul Melanin Ltd | Education | 2020 |
| Southborough Butchers Ltd | Wholesale & retail | 2013 |
| Southern Panel Company Limited (the) | Other services | 1973 |
| Spaceman Creative Studio Ltd | Professional & scientific | 2016 |
| Spark 7 Ltd | Wholesale & retail | 2024 |
| Specialist Landscapers Ltd | Administrative & support | 2020 |
| Specialist Learning Trust | Education | 2017 |
| Speedy 675 Enterprises Limited | Wholesale & retail | 2011 |
| Spencer Boyce Limited | Construction | 2016 |
| Spice Services Ltd | Construction | 2025 |
| Spike Design Ltd | Professional & scientific | 2016 |
| Sportsbook Solutions Limited | Arts & recreation | 2025 |
| Spreadland Limited | Wholesale & retail | 1979 |
| Springfield Quad Ltd | Professional & scientific | 2023 |
| SRM London Limited | Professional & scientific | 2016 |
| SS Holdings (London) Ltd | Wholesale & retail | 2021 |
| St&C Group Ltd | Education | 2025 |
| Stancedate Property Management Limited | Real estate | 1997 |
| Startup Summit Limited | Administrative & support | 2026 |
| Station Sweets Spot Ltd | Wholesale & retail | 2022 |
| Steamstream LLP | | 2010 |
| Stes Holdings Limited | Financial services | 2024 |
| Stevenson Heating Limited | Construction | 2003 |
| Stocker Consulting Ltd | Professional & scientific | 2017 |
| Stratton and Sons Limited | Real estate | 2020 |
| Stratton Prime Property Ltd | Real estate | 2024 |
| Straw Services Ltd | Information & communication | 2013 |
| Structural Monitoring Services Limited | Construction | 2010 |
| Studio Axis Limited | Professional & scientific | 2025 |
| Studio Bartlett Limited | Arts & recreation | 2017 |
| Studio Pettigrew Ltd | Professional & scientific | 2016 |
| Stunning Car Ltd | Wholesale & retail | 2023 |
| SUE Fraser Consultancy Limited | Administrative & support | 2015 |
| Suleymans Barbers Ltd | Other services | 2026 |
| Surveykit Limited | Information & communication | 2019 |
| Sussex Asset Finance Limited | Financial services | 2003 |
| Svala Ltd | Manufacturing | 2025 |
| SW5 Consulting Ltd | Administrative & support | 2021 |
| Syslink Xandria Ltd | Information & communication | 2017 |
| T&G Homes Limited | Real estate | 2021 |
| T&N Building Services Ltd | Construction | 2024 |
| T.Ba Life Ltd | Wholesale & retail | 2014 |
| TA AV Ltd | Construction | 2019 |
| Tables for Business Ltd | Wholesale & retail | 2014 |
| Take the Plunge Limited | Arts & recreation | 2021 |
| Tala Management Ltd | Construction | 2026 |
| Tann Electronics Limited | Other services | 1984 |
| Task Security Services Limited | Real estate | 2000 |
| Taste of Georgia Limited | Wholesale & retail | 2017 |
| Tatnell Limited | Information & communication | 2013 |
| TAU Fintech Limited | Information & communication | 2025 |
| TD Consulting (TDC) Ltd | Professional & scientific | 2020 |
| Teasel Studio Ltd | Wholesale & retail | 2025 |
| Teatree Property Limited | Real estate | 2019 |
| TECHWOMEN4BOARDS Ltd | Information & communication | 2021 |
| Techwomenforboards Ltd | Information & communication | 2024 |
| Teknify PVT Ltd | Information & communication | 2026 |
| TEN Thousand: Creative Limited | Arts & recreation | 2022 |
| Tender Paws Limited | Professional & scientific | 2011 |
| Tests 4 Travels Ltd | Information & communication | 2021 |
| TFF Architects Ltd | Professional & scientific | 2004 |
| TG16 Limited | Professional & scientific | 2024 |
| TGB Construction Management Ltd | Construction | 2016 |
| THE a Clean Detailing Ltd | Administrative & support | 2023 |
| THE Barbers Club Limited | Other services | 2011 |
| THE Beauty and BED Studio Ltd | Other services | 2018 |
| THE Beckenham & Penge Gateway Club | Arts & recreation | 1998 |
| THE Bromley Bathroom Company Ltd. | Construction | 2013 |