| SO PH Investments Ltd | Real estate | 2025 |
| Solar Roof Investments Ltd | Professional & scientific | 2011 |
| Solion Limited | Professional & scientific | 2002 |
| Sones Accountancy Services Ltd | Professional & scientific | 2013 |
| Sones Property Group Ltd | Real estate | 2024 |
| Sonham Group Ltd | Construction | 2024 |
| Southmill Management Limited | Real estate | 1985 |
| Sovereign Medical Group Limited | Extraterritorial | 2022 |
| Sovereign Medical Limited | Wholesale & retail | 2000 |
| Sovereign Orthopaedics Ltd | Wholesale & retail | 2002 |
| Sp&Ah Limited | Administrative & support | 2014 |
| Spence Lift Solutions Ltd | Construction | 2025 |
| Spider Telecommunications Limited | Information & communication | 2008 |
| Spiritualists' National Union Trust | Financial services | 2018 |
| Sports Digital Media Limited | Professional & scientific | 2010 |
| Sports Travel International Limited | Administrative & support | 2014 |
| Ssol Company Management Limited | Professional & scientific | 2007 |
| SSS Group(Uk) Ltd | Wholesale & retail | 2020 |
| ST Osyth Priory Estate (Management) Limited | Real estate | 2019 |
| ST Osyth Priory Estate Ltd | Real estate | 2017 |
| ST Osyth Priory Events Limited | Real estate | 2024 |
| ST Osyth Priory Holdings Limited | Financial services | 2024 |
| ST Osyth Priory Homes Ltd | Real estate | 2022 |
| ST Osyth Priory Leisure Limited | Real estate | 2020 |
| ST Osyth Priory Precinct Limited | Real estate | 2024 |
| Stansted Angling Warehouse Ltd | Other services | 2005 |
| Stansted Express Cars Ltd | Transport & logistics | 2019 |
| Stansted Heating Solutions Ltd | Construction | 2024 |
| Stansted Homogenising Systems Limited | Manufacturing | 2017 |
| Stansted Mental Health Initiative C.I.C. | Health & social care | 2020 |
| Stansted Mountfitchet Link Magazine CIC | Information & communication | 2009 |
| Stansted Parking Services Ltd | Transport & logistics | 2026 |
| Stansted Spice Ltd | Hospitality | 2024 |
| Stanta Crowley | Construction | 2011 |
| Stewart & Sons Limited | Construction | 2004 |
| Stewart J Enterprise Ltd. | Professional & scientific | 2025 |
| Stewart Rich Enterprise Ltd | Construction | 2025 |
| Still, YOU Know Best Limited | Arts & recreation | 2002 |
| Stills & Reels Ltd | Information & communication | 2025 |
| Streamstay Limited | Information & communication | 2006 |
| Swan Group Management Services Limited | Administrative & support | 1987 |
| Swan Investments Group Holdings Limited | Financial services | 2018 |
| Swan Investments Group Limited | Professional & scientific | 1982 |
| Synergy Compliance Limited | Other services | 2003 |
| T&G Housing & Investment Services Ltd | Financial services | 2013 |
| Tailorsongs Ltd | Information & communication | 2018 |
| Talus Homes Ltd | Construction | 2026 |
| Tamsta Group Ltd | Construction | 2025 |
| Tanay Ltd | Hospitality | 2026 |
| Tayflow Technologies Ltd | Information & communication | 2025 |
| TBS Outdoor Limited | Wholesale & retail | 2014 |
| TE Sportswear Ltd | Wholesale & retail | 2020 |
| Team-England Ltd | Extraterritorial | 2005 |
| Tela Limited | Information & communication | 1997 |
| Teltronic Communications Limited | Administrative & support | 2001 |
| Terry Reed & Company Limited | Financial services | 1975 |
| Tetrad Aviation Limited | Transport & logistics | 2025 |
| TFM (London) Limited | Extraterritorial | 2018 |
| Tgbn Ltd | Professional & scientific | 2009 |
| THE Bushcraft Store Limited | Professional & scientific | 2011 |
| THE Exchange Management Company (Stansted) Limited | Real estate | 2008 |
| THE Green Business Network Ltd | Professional & scientific | 2016 |
| THE Heart of Holistic Health Limited | Health & social care | 2020 |
| THE Herts and Essex Therapy Clinic Limited | Health & social care | 2013 |
| THE House of Hormones Limited | Wholesale & retail | 2023 |
| THE Hypno HUT Ltd | Professional & scientific | 2022 |
| THE Inspirit Technique Limited | Other services | 2025 |
| THE IP Factory Limited | Extraterritorial | 2023 |
| THE Landscapers Hub Ltd | Other services | 2022 |
| THE Nurture Group Network Limited | Administrative & support | 2005 |
| THE Outsiders Outdoor Gear Ltd | Wholesale & retail | 2026 |
| THE Panathlon Foundation Limited | Arts & recreation | 1997 |
| THE Queens Head (Stansted) Ltd. | Hospitality | 2013 |
| THE Redeemed Christian Church of GOD (Rccg) the Lord's Vine Bishop's Stortford | Other services | 2024 |
| THE Scrapyard Combat Academy Ltd | Arts & recreation | 2026 |
| THE Stansted Group Ltd | Professional & scientific | 2020 |
| THE Tranquil Group Ltd | Financial services | 2025 |
| THE Wastepack Group Limited | Financial services | 2000 |
| Thegcp Limited | Professional & scientific | 2025 |
| Themacdaddy Limited | Hospitality | 2021 |
| Think & DO Ltd | Professional & scientific | 2020 |
| Third Party Music Limited | Information & communication | 2014 |
| Thomas Lyons Developments Limited | Real estate | 1998 |
| Thommo Limited | Arts & recreation | 2011 |
| Three Colts Yard Management Company Limited | Households | 2020 |
| Titan Airways Europe (UK) Holdings Limited | Financial services | 2021 |
| Titan Airways Limited | Transport & logistics | 1988 |
| Topline Travel Limited | | 1982 |
| Total English Ltd | Education | 2012 |
| Toynton Change Management Ltd | Information & communication | 2020 |
| Trade Group Construction Limited | Construction | 2021 |
| Tranquil IT Solutions (South) Limited | Information & communication | 2010 |
| Travel Campus Ltd | Hospitality | 2024 |
| Trident OIL & GAS Claims Consultants Limited | Professional & scientific | 2017 |
| Tutor Doctor Essex LLP | | 2023 |
| Two Two Five Concepts Limited | Administrative & support | 2011 |
| Uppers Coffee Limited | Hospitality | 2022 |
| Verandahshop Limited | Wholesale & retail | 2004 |
| Vermillion Limited | Arts & recreation | 2000 |
| VHG Estate Limited | Financial services | 2025 |