| South Devon Audio Visual Ltd | Professional & scientific | 2016 |
| South Shoreditch Development Ltd | Real estate | 2003 |
| Southernxpubco Ltd | Hospitality | 2026 |
| Sowatt Energy Ltd | Administrative & support | 2024 |
| SP & J Manufacturing Limited | Construction | 2017 |
| SP Food Mart Limited | Wholesale & retail | 2023 |
| SP Mortgages & Protection Limited | Financial services | 2026 |
| SPD Haulage Ltd | Transport & logistics | 2021 |
| Speed Hire Ltd | Administrative & support | 2021 |
| Spindle Studios Limited | Information & communication | 2026 |
| Spinks Thornton LLP | | 2026 |
| Spirit Menswear (Clothing) Ltd | Wholesale & retail | 2022 |
| Spjv Holdings Ltd | Real estate | 2023 |
| Sports Knee Doctor Ltd | Health & social care | 2025 |
| Sporty Champs Ltd | Education | 2017 |
| Spriggs Oak (Freehold) Limited | Households | 1996 |
| Spring Steel Productions Limited | Manufacturing | 2013 |
| SPW Floor Screeding Epping Limited | Construction | 2024 |
| SPW Floor Screeding Specialists Limited | Construction | 2006 |
| SRH Plastering Services Limited | Construction | 2011 |
| ST Augustine Court (Bishop's Stortford) Management Company Limited | Households | 2010 |
| ST Ives Lodge Care Ltd | Health & social care | 2012 |
| ST Marks House Chelmsford Management Company Limited | Administrative & support | 2021 |
| ST. John’S Residence Association Limited | Households | 2018 |
| Stagg Ductwork Installations Limited | Wholesale & retail | 2007 |
| Station Road Barbers Limited | Other services | 2016 |
| Status Marquees Ltd | Administrative & support | 2009 |
| Stiles Capital Ltd | Financial services | 2015 |
| STM Styling Ltd | Wholesale & retail | 2022 |
| Stonehall Grove Management Limited | Households | 2017 |
| Stonelink Driveways & Patios Ltd | Construction | 2026 |
| Stonelink Paving Solutions Ltd | Construction | 2026 |
| Stonewood Accountancy Ltd | Professional & scientific | 2020 |
| Stonewood Consultancy Limited | Professional & scientific | 2022 |
| Storm Bird Productions Ltd | Information & communication | 2025 |
| Strata Systems Ltd | Information & communication | 2025 |
| Strategic Consultancy Solutions Limited | Professional & scientific | 1994 |
| Strategic Entertainment Ltd | Information & communication | 2023 |
| Strategic Music Limited | Information & communication | 2014 |
| Stratford Waterfront Boat Centre Limited | Transport & logistics | 2016 |
| Strikely Golf Ltd | Wholesale & retail | 2026 |
| Striker Leads Ltd | Professional & scientific | 2023 |
| Structura Building Surveyors Limited | Professional & scientific | 2023 |
| Studio 220 Epping Ltd | Arts & recreation | 2025 |
| Style N Craft Leathers Ltd | Wholesale & retail | 2025 |
| Style Stone Ltd | Manufacturing | 2019 |
| Subzero Carbon Ltd | Other services | 2023 |
| Suisse Capital Limited | Professional & scientific | 2015 |
| Suite 157 Limited | Real estate | 2026 |
| Sully Electrical and GAS Limited | Construction | 2011 |
| Summer Brandon Studio Ltd | Professional & scientific | 2025 |
| Sunflower Montessori Nursery School Ltd | Education | 2023 |
| Sunmill Care Services Limited | Public administration | 2025 |
| Sunrise Meadow Care Ltd | Health & social care | 2025 |
| Sunrise Plains Ltd | Real estate | 2025 |
| Sunshiine Ltd | Other services | 2021 |
| Susan Magill Limited | Arts & recreation | 2011 |
| Sutton & Tawney Buildings Limited | Real estate | 2018 |
| Sutton & Tawney Estates Farming Limited | Agriculture & fishing | 2023 |
| Sutton & Tawney Estates Limited | Real estate | 2018 |
| Sutton & Tawney Group Ltd | Construction | 2024 |
| Sutton & Tawney Trading Group Limited | Financial services | 2022 |
| Sutton & Tawney Ventures LLP | | 2024 |
| Sutton and Tawney Limited | Manufacturing | 2012 |
| Sutton Construction (UK) Limited | Construction | 2013 |
| Suze Russo Services Ltd | Administrative & support | 2018 |
| Swan Epping Limited | Hospitality | 2014 |
| Swcwlv LLP | | 2025 |
| Sweet Treats by AMY Limited | Hospitality | 2017 |
| Swift Travel Services Limited | Transport & logistics | 2015 |
| Swinhoe Associates Ltd | Professional & scientific | 2018 |
| Switchback Solutions Limited | Information & communication | 2016 |
| Sycamore Reserve Limited | Wholesale & retail | 2025 |
| Sylvia Assistance | Health & social care | 2022 |
| Synoxis Ltd | Information & communication | 2024 |
| T G M Construction (Essex) Limited | Construction | 2019 |
| T H Surveying Services Ltd | Professional & scientific | 2014 |
| T.Hammond Holdings Ltd | Financial services | 2016 |
| Tafraout Tours UK Ltd | Administrative & support | 2026 |
| Takeley Estates Limited | Real estate | 2007 |
| Tammy-Template Ltd | Arts & recreation | 2026 |
| Tandy Training Ltd | Arts & recreation | 2024 |
| Tara Mcginley Ltd | Health & social care | 2024 |
| Taratec Consultancy Limited | Information & communication | 2001 |
| Tasty Kerala Ltd | Wholesale & retail | 2026 |
| Tawney Estate Ltd | Agriculture & fishing | 2022 |
| TCF Properties Limited | Real estate | 2000 |
| Teach UAE Group Ltd | Other services | 2025 |
| Technologic Specialised Recycling Ltd | Water & waste | 2022 |
| Tecserv Media Limited | Information & communication | 1999 |
| Tee.Eye.En.Oh. Limited | Wholesale & retail | 2020 |
| Telc Developments Limited | Construction | 2025 |
| Templant Hire Limited | Other services | 1997 |
| Templar Capital Limited | Real estate | 2025 |
| Ten-Acre Wines Limited | Wholesale & retail | 2004 |
| Terra Verde Services Limited | Water & waste | 2024 |
| TES Building Services Ltd | Administrative & support | 2022 |
| TES Facilities Supplies Ltd | Extraterritorial | 2025 |
| TES Holdings Group Ltd | Financial services | 2025 |
| TES Lighting Solutions Ltd | Construction | 2025 |