| Stort Blinds Limited | Wholesale & retail | 2010 |
| Stort Hill Limited | Information & communication | 2021 |
| Stort HR Ltd | Administrative & support | 2021 |
| Stortford Barbers Ltd | Other services | 2024 |
| Stortford Developments Ltd | Financial services | 2024 |
| Stortford Events Limited | Hospitality | 2021 |
| Stortford Groomies Limited | Other services | 2025 |
| Stortford Gymnastics Ltd | Arts & recreation | 2015 |
| Stortford Hall Property Limited | Real estate | 2019 |
| Stortford Holdings Limited | Financial services | 2018 |
| Stortford Interiors (UK) Limited | Construction | 1992 |
| Stortford Park Farm Barns Limited | Construction | 2026 |
| Stortford Park Farm Farmhouse Limited | Construction | 2026 |
| Stortford Prestige Limited | Administrative & support | 2007 |
| Stortford Properties Limited | Real estate | 2019 |
| Stortford Property Holdings Ltd | Real estate | 2025 |
| Stortford Rooms Ltd | Health & social care | 2025 |
| Stortford Sports Limited | Arts & recreation | 2026 |
| Stortford Strategic Limited | Financial services | 2026 |
| Stortford Turkish Restaurant Limited | Hospitality | 2019 |
| Stortford Vikings Ltd | Other services | 2023 |
| Stow Residential Limited | Real estate | 2013 |
| Stratcore Solutions Ltd | Information & communication | 2026 |
| Stratex (Holdings) Limited | Financial services | 2015 |
| Stratex Partners LLP | | 2015 |
| Stratton & Vale Motor Cars Limited | Wholesale & retail | 2025 |
| Stream Plumbing & Heating Limited | Construction | 2015 |
| Streatham Ice Hockey Club Ltd | Arts & recreation | 2023 |
| Street Barn Limited | Professional & scientific | 2019 |
| Streets Ahead Investments Limited | Real estate | 2023 |
| Strictly Xtended Group Limited | Wholesale & retail | 2025 |
| Strident Consulting Limited | Professional & scientific | 2019 |
| Strongsuits Limited | Professional & scientific | 2016 |
| Strulestone Limited | Real estate | 1988 |
| Studio DWK Limited | Professional & scientific | 2007 |
| Studio Heroine Ltd | Professional & scientific | 2023 |
| Studio Pachira Ltd | Education | 2025 |
| Studio Question Marque Ltd | Professional & scientific | 2021 |
| Studio RHL Ltd | Professional & scientific | 2015 |
| Studio Warren Ltd | Professional & scientific | 2025 |
| Stylecrush Ltd | Wholesale & retail | 2022 |
| Stylera Ltd | Wholesale & retail | 2025 |
| SU Mini Market Ltd | Wholesale & retail | 2021 |
| Subcooling Services Ltd | Construction | 2016 |
| Subcooling Solutions Limited | Construction | 2026 |
| Subo Enterprises Ltd | Financial services | 2024 |
| Subs VIP Ltd | Extraterritorial | 2025 |
| Successhealth Ltd | Health & social care | 2021 |
| Suffolk House Management (Bury ST Edmunds) Ltd | Households | 2020 |
| Sugarcoated Sisters Ltd | Wholesale & retail | 2024 |
| Sugarman Developments LLP | | 2025 |
| Sugarman Residential Limited | Real estate | 2024 |
| Summercroft Primary School | Education | 2011 |
| Summers Consulting Services Ltd | Administrative & support | 2021 |
| Summit Consultancy (London) Limited | Financial services | 2018 |
| Sums of Anarchy Ltd | Professional & scientific | 2019 |
| Suncombe Limited | Manufacturing | 1963 |
| Sunny Beach Holiday Apartments Limited | Hospitality | 2014 |
| Sunshine Commercial Cleaning Limited | Administrative & support | 2026 |
| Sunstar Properties Limited | Real estate | 1998 |
| Supaw Nanny Limited | Other services | 2015 |
| Super Curious Ltd | Information & communication | 2026 |
| Supernova SA Limited | Real estate | 2019 |
| Supplygo Holdings Ltd | Financial services | 2023 |
| Support Reimagined Ltd | Education | 2021 |
| Surphidium Limited | Professional & scientific | 2019 |
| Surtec Design Ltd | Professional & scientific | 1997 |
| Sustainbuild Properties Ltd | Real estate | 2023 |
| Sutes Property Limited | Construction | 2016 |
| SV Accountancy Solutions Limited | Professional & scientific | 2016 |
| Svdp Properties Ltd | Real estate | 2023 |
| SWA (UK) Limited | Households | 2003 |
| Swanston Cartographic Archive Limited | Information & communication | 2016 |
| Swats for Tots Ltd | Health & social care | 2015 |
| SWB Group Limited | Professional & scientific | 2021 |
| Sweet BEA Partners Limited | Administrative & support | 2025 |
| Sweet Shake Spot Ltd | Wholesale & retail | 2023 |
| Swiftconnect UK Limited | Administrative & support | 2020 |
| Swivlr Limited | Information & communication | 2010 |
| Sydney Walsh Properties Limited | Real estate | 2016 |
| Synja Ltd | Information & communication | 2013 |
| Systemicpsych Limited | Health & social care | 2021 |
| T B Flooring & Plastering Ltd | Construction | 2024 |
| T J Hughes & Sons Ltd | Households | 2025 |
| T Parks Cabling Ltd | Information & communication | 2012 |
| T Ramiz Services Limited | Administrative & support | 2026 |
| T&G Media Ltd | Information & communication | 2024 |
| T&M Solutions Limited | Manufacturing | 2025 |
| T&Z Prime Homes Ltd | Real estate | 2024 |
| T.P. Flat Services (1) Limited | Real estate | 1976 |
| T.P. Flat Services (3) Limited | Households | 1977 |
| T.T.S. Fire & Security Limited | Administrative & support | 1995 |
| T.W. Estate Services Ltd | Professional & scientific | 2025 |
| T8 Energy Trading Limited | Wholesale & retail | 2020 |
| T8 U.K. Limited | Transport & logistics | 2015 |
| Taesroy Limited | Professional & scientific | 2025 |
| Taggart Transcontinental Ltd. | Financial services | 2008 |
| Tailored & Groomed Limited | Health & social care | 2020 |
| Tailored Tails by Benji Ltd | Wholesale & retail | 2023 |
| Takeley Chiropractic Ltd | Health & social care | 2017 |