| Southern Technical Services Limited | Extraterritorial | 1984 |
| Southridge Architecture Limited | Professional & scientific | 2010 |
| Southview House Crowborough Management Company Limited | Households | 2000 |
| Spacemerge Residents Management Limited | Professional & scientific | 1988 |
| Spacewalk Productions Ltd | Information & communication | 2023 |
| Sparkes Properties Limited | Real estate | 2025 |
| Spinney Garlands Newcroft Redwood Silverwood Homewood Ltd | Households | 2019 |
| Spitlye Management Company Limited | Households | 1999 |
| Spring (Europe) Limited | Manufacturing | 2004 |
| Sprutty Ltd | Professional & scientific | 2018 |
| ST Mary's Park Number 1 Management Company Limited | Households | 2004 |
| Stables Farm Park Ltd | Construction | 2018 |
| Stanbridge Property Ltd | Real estate | 2024 |
| Stanbridge Surfacing Ltd | Administrative & support | 2018 |
| Starglade Commercial Limited | Real estate | 2001 |
| Starglade Estates Limited | Construction | 1997 |
| Starglade Land & New Homes Limited | Construction | 1999 |
| Starglade Parks Limited | Real estate | 2005 |
| Starglade Parks Resorts Ltd | Construction | 2014 |
| Starglade South East Ltd | Real estate | 2009 |
| Starter Music Limited | Wholesale & retail | 2013 |
| Stellar Homes Limited | Real estate | 1999 |
| Stellar Yachts Ltd | Wholesale & retail | 2020 |
| Stephen Tester Funeral Directors Limited | Other services | 2025 |
| Sterling Global Properties Ltd | Real estate | 2025 |
| Sterling Northolt Limited | Professional & scientific | 2013 |
| Stiire Ltd | Real estate | 2020 |
| Stone Cross Consultants Limited | Real estate | 2010 |
| Stonehouse Plumbing Limited | Construction | 2011 |
| Stoney Meadows Landscaping Limited | Administrative & support | 2024 |
| Stonham Barns Aqua Park Ltd | Real estate | 2023 |
| Story Book Studios Limited | Education | 2026 |
| Strawberry Pavlova Ltd | Administrative & support | 2022 |
| Streeter's Traditional Butchers Ltd | Wholesale & retail | 2026 |
| Strogurzey Park Ltd | Real estate | 2013 |
| Strong Life Ltd | Arts & recreation | 2017 |
| Strops Barbers Limited | Other services | 2014 |
| Strops Barbers TW Limited | Other services | 2017 |
| Strops Property Limited | Real estate | 2017 |
| Structural Intelligence Group Ltd | Information & communication | 2026 |
| Stucco Property Ltd | Real estate | 2025 |
| Stucco Studio Ltd | Construction | 2023 |
| Studio Lemaitre Limited | Arts & recreation | 2022 |
| Stylos Tearson Ltd | Administrative & support | 2025 |
| Suboph Ltd | Education | 2021 |
| Summer Global Consultancy Limited | Administrative & support | 2017 |
| Sunny Court Residents Company Limited | Extraterritorial | 2000 |
| Sunshine Office Cleaning (UK) Limited | Arts & recreation | 1994 |
| Supershine Cleaning Limited | Administrative & support | 2014 |
| Survival Aids UK Limited | Wholesale & retail | 2005 |
| Sussex Electrical Limited | Construction | 2015 |
| Sussex Floor Care Limited | Construction | 2018 |
| Sussex Motor Yacht Club Limited | Arts & recreation | 2019 |
| Sussex Planning Consultants Ltd | Professional & scientific | 2025 |
| Sussex Residential Limited | Real estate | 2016 |
| Sussex Solar and Renewables Limited | Construction | 2017 |
| Swan Securities Limited | Construction | 1972 |
| Swan Transport Limited | Transport & logistics | 2019 |
| SWS Web Solutions Ltd | Information & communication | 2020 |
| Synergy Mobility Limited | Extraterritorial | 2010 |
| T Tahany Consulting Limited | Professional & scientific | 2018 |
| T.C. Woodgate Tree Surgery Ltd | Agriculture & fishing | 2019 |
| T.J Plasterers Ltd | Construction | 2021 |
| Tako Limited | Information & communication | 2006 |
| Talopulse Ltd | Professional & scientific | 2026 |
| Tamg Holdings Limited | Real estate | 2000 |
| Tanto Events Ltd | Administrative & support | 2026 |
| Tappin Design Limited | Professional & scientific | 2008 |
| Tara Ashwell Designs Ltd | Professional & scientific | 2021 |
| Taste of Cyprus Limited | Hospitality | 2012 |
| TCH Leisure Ltd | Arts & recreation | 2025 |
| TDP Global Limited | Administrative & support | 2019 |
| Teaselwood Disaster Restoration Limited | Administrative & support | 2006 |
| Tekton Property Limited | Construction | 2022 |
| Temporal Songs Limited | Arts & recreation | 1996 |
| TEN2SEVEN Ltd | Professional & scientific | 2022 |
| Tendspot Limited | Real estate | 2018 |
| TFH Consulting Limited | Information & communication | 2025 |
| Tgtco. Limited | Information & communication | 2021 |
| TH Systems Limited | Administrative & support | 2018 |
| THE Aromatherapy LAB Ltd | Wholesale & retail | 2019 |
| THE Assisters Limited | Administrative & support | 2021 |
| THE Beeches RTM Company Limited | Households | 2016 |
| THE Beechings Management Company Limited | Households | 1997 |
| THE Berry Patch Limited | Hospitality | 2025 |
| THE BI Partnership Limited | Information & communication | 2013 |
| THE Brackens (Crowborough) Management Limited | Households | 2006 |
| THE Butcher and the HOG Limited | Hospitality | 2015 |
| THE Colour Sanctuary Salon Ltd | Other services | 2020 |
| THE Complete Lunch Limited | Hospitality | 2002 |
| THE Crowborough Weald Gospel Trust | Other services | 2021 |
| THE Estas Group Ltd | Professional & scientific | 2007 |
| THE Fireplace Company Crowborough Limited | Wholesale & retail | 2018 |
| THE Five South Grove Management Company Limited | Households | 1999 |
| THE Fugitive Group Limited | Information & communication | 1987 |
| THE Hallowed Crow Ltd | Arts & recreation | 2025 |
| THE Hessel Group Limited | Administrative & support | 1994 |
| THE Hollies (Crowborough) Limited | Hospitality | 2009 |
| THE I AM Life Project Ltd | Health & social care | 2020 |
| THE James Biley Partnership Ltd | Real estate | 2019 |