| Stadium Studio Youth Hub CIC | Information & communication | 2025 |
| Staff Master Limited | Hospitality | 2025 |
| Staff Stream Solutions Ltd | Administrative & support | 2025 |
| Stafford Roofing Ltd | Construction | 2019 |
| Stage One Associates Ltd | Arts & recreation | 2022 |
| Stages Performers Academy Ltd | Education | 2011 |
| Stain Ltd | Information & communication | 2023 |
| Staines Road SPV Limited | Real estate | 2025 |
| Stainsworth Developments Ltd | Real estate | 2006 |
| Staka MED Ltd. | Health & social care | 2018 |
| Stallion Motor Group Limited | Wholesale & retail | 2025 |
| Stan Property Ltd | Real estate | 2023 |
| Stan-B Ltd | Other services | 2015 |
| Stana Digital Limited | Professional & scientific | 2026 |
| Stanbridge & Sons Ltd | Professional & scientific | 2022 |
| Standard Technical Consulting Limited | Administrative & support | 2010 |
| Standard Technical Contracting Limited | Professional & scientific | 2017 |
| Stanev Style Ltd | Construction | 2019 |
| Stanh Ltd | Administrative & support | 2026 |
| Stanley BI Ltd | Transport & logistics | 2023 |
| Stansted Raceway Ltd | Arts & recreation | 2019 |
| Stapleford Minerals and Metals Limited | Wholesale & retail | 2012 |
| Staplefords Industries Ltd | Wholesale & retail | 2012 |
| Star Bookmakers (UK) Limited | Arts & recreation | 2003 |
| Star Buy Ltd | Wholesale & retail | 2021 |
| Star Cars Properties Ltd | Real estate | 2024 |
| Star Garage (Romford) Ltd | Wholesale & retail | 2011 |
| Star K9 Security Services Ltd | Administrative & support | 2021 |
| Star Lite Facilities Management Ltd | Administrative & support | 2018 |
| Star Medi Plus Ltd | Health & social care | 2021 |
| Star NAP Ltd | Households | 2026 |
| Star P Martini Limited | Manufacturing | 2022 |
| Star Reach Marketing Ltd | Professional & scientific | 2025 |
| Star Surgiscope Limited | Health & social care | 2018 |
| Star Xpress Ltd | Transport & logistics | 2023 |
| Staray Ltd | Education | 2021 |
| Starit Healthcare Ltd | Health & social care | 2010 |
| Starlight DRY Cleaning Limited | Other services | 2017 |
| Starlike Consulting Ltd | Professional & scientific | 2022 |
| Starline Drylining Ltd | Construction | 2023 |
| Starline Healthcare Group Limited | Administrative & support | 2021 |
| Starling Solutions Group Ltd | Professional & scientific | 2026 |
| Starmed Realty Ltd | Real estate | 2026 |
| Stars of David | Other services | 2023 |
| Stars of Deen Limited | Health & social care | 2025 |
| Start UP I&G Ltd | Construction | 2016 |
| Starvic Group Ltd | Real estate | 2024 |
| Stash Monthly Ltd | Wholesale & retail | 2024 |
| State Construction Ltd | Construction | 2023 |
| Station Court (Bansons Way) Management Company Limited | Administrative & support | 1982 |
| Status Design Associates Limited | Construction | 2015 |
| Staykov Rail Ltd | Agriculture & fishing | 2015 |
| Stbone Ltd | Education | 2024 |
| Steadfast Trading London Ltd | Hospitality | 2014 |
| Steads Centre Limited | Professional & scientific | 2002 |
| Steadyworks Ltd | Construction | 2025 |
| Stealth Automotive Limited | Wholesale & retail | 2018 |
| Stebsys Limited | Information & communication | 1995 |
| Stech IT Solutions Ltd | Information & communication | 2026 |
| Steel 4 Builders Limited | Extraterritorial | 2009 |
| Steel Contract Services Limited | Professional & scientific | 2025 |
| Steel Defence IT Limited | Information & communication | 2020 |
| Steel Factor Limited | Construction | 2026 |
| Steel Fixing Ltd | Construction | 2018 |
| Steel for Builders Holdings Limited | Financial services | 2008 |
| Steel for Builders Limited | Extraterritorial | 2008 |
| Steelrise Scaffolding Essex Limited | Construction | 2025 |
| Steelway Apartments RTM Company Limited | Households | 2025 |
| Steering Skills Driving School Limited | Education | 2025 |
| Stefan Electrical Contractors Ltd | Construction | 2014 |
| Stelco Interiors Limited | Construction | 2019 |
| Stellar Enterprise Limited | Wholesale & retail | 2019 |
| Stellar Heating Ltd | Construction | 2024 |
| Stellar Storage Solutions Limited | Transport & logistics | 2026 |
| Stellarco Limited | Information & communication | 2025 |
| Stellford Ltd | Real estate | 2023 |
| Stely Limited | Construction | 2013 |
| Stely Services Ltd | Construction | 2018 |
| Stemsmartsolutions Limited | Information & communication | 2023 |
| Stenoman Ltd | Wholesale & retail | 2025 |
| Step by Step Services Ltd | Administrative & support | 2018 |
| Step Ladder Ltd | Information & communication | 2022 |
| Step UP Care Group Ltd | Health & social care | 2024 |
| Stepfran Limited | Information & communication | 2014 |
| Stephen Carpenter Electrical Limited | Construction | 2014 |
| Stephen J Wright Limited | Professional & scientific | 2002 |
| Stephen James Hornchurch Ltd | Real estate | 2025 |
| Stephen Markham Collections Limited | Extraterritorial | 2025 |
| Stephsam Support & Care Ltd | Information & communication | 2025 |
| Stepping Stone Lodgings Ltd | Health & social care | 2020 |
| Stepstone Investments Limited | Construction | 2018 |
| Stepup Construction CV Ltd | Construction | 2021 |
| Sterling Assessors Ltd | Professional & scientific | 2026 |
| Sterling Cooper Advisory Limited | Professional & scientific | 2013 |
| Sterling Estate Partners Limited | Real estate | 2024 |
| Sterling Index Group Limited | Administrative & support | 2025 |
| Sterling Ledger Advisory Ltd | Information & communication | 2026 |
| Sterling Study Abroad Ltd | Education | 2021 |
| Stetco Services Ltd | Construction | 2016 |
| Stets UN Limited | Construction | 2023 |