| Stephen Farra Associates Limited | Professional & scientific | 2008 |
| Stephen Farra Estates & Management Limited | Financial services | 1993 |
| Stephen Farra Holdings Ltd | Financial services | 2025 |
| Stephen Wright Mortgage Consultancy Limited | Financial services | 2017 |
| Steve Butterworth Ltd | Construction | 2024 |
| Steve Collett Limited | Construction | 2016 |
| Stewart Property Management Company (Hornchurch) Limited | Real estate | 2024 |
| Stic's Kitchen Ltd | Hospitality | 2024 |
| Stirling Ice Limited | Other services | 2006 |
| Stoke Fleming Limited | Construction | 2023 |
| Stokes and Simmons Limited | Real estate | 2025 |
| Stokes Group Limited | Financial services | 2025 |
| Stolar Ltd | Construction | 2022 |
| Stomp Radio Limited | Information & communication | 2010 |
| Stone River Graphics Limited | Administrative & support | 2023 |
| Stonebridge Surveyors Ltd | Professional & scientific | 2016 |
| Stonemont Ltd | Other services | 2025 |
| Stoneridge Solutions Limited | Administrative & support | 2023 |
| Stoneshaw Estates Limited | Real estate | 2008 |
| Stormfield Limited | Hospitality | 2015 |
| Stradbally Construction Limited | Construction | 2020 |
| Strand Productions Limited | Information & communication | 1999 |
| Strategic Solutions London Limited | Information & communication | 2006 |
| Stratovate Solutions Ltd | Professional & scientific | 2025 |
| Strawberry Property Services Limited | Real estate | 2018 |
| Stride OUT Studios Ltd | Information & communication | 2026 |
| Strong Concept Limited | Administrative & support | 2022 |
| Structemp Innovations Limited | Manufacturing | 2020 |
| Studi+O Limited | Professional & scientific | 2024 |
| Studio 141 Limited | Arts & recreation | 2026 |
| Studio 151 Ltd | Professional & scientific | 2013 |
| Studio Switch Limited | Arts & recreation | 2024 |
| Studio Unseen Ltd | Manufacturing | 2026 |
| Studiophone Limited | Information & communication | 2016 |
| Stunningnail UK Ltd | Other services | 2025 |
| Style in Mind Ltd | Professional & scientific | 2025 |
| Styles Hub Limited | Administrative & support | 2023 |
| SU Catering Limited | Hospitality | 2013 |
| Sub-Sahara Commercial Ltd | Real estate | 2023 |
| Sub-Sahara Developments Limited | Real estate | 2017 |
| Sufna Solutions Ltd | Information & communication | 2025 |
| Sufren Limited | Hospitality | 2023 |
| SUI Generis Services Limited | Administrative & support | 2007 |
| Sukami Group Ltd | Professional & scientific | 2020 |
| Sumawine Limited | Construction | 2016 |
| Sumbal Rizvi Global Ltd | Wholesale & retail | 2024 |
| Summit IT Consultancy Ltd | Information & communication | 2016 |
| Sumudamalux Ltd | Wholesale & retail | 2025 |
| Sun City Tanning Limited | Administrative & support | 2010 |
| Sun-Dial Blind Company LLP | | 2007 |
| Sunday Shorts Film Festival Ltd | Information & communication | 2018 |
| Sungrove Investment and Development Ltd | Construction | 2020 |
| Sunkissed Heaven Ltd | Other services | 2024 |
| Sunrayz Essex (2025) Ltd | Other services | 2025 |
| Super Grill Ltd | Hospitality | 2016 |
| Super Roofing Ltd | Construction | 2018 |
| Super Star Roofing Limited | Construction | 2024 |
| Superpower Mastery Ltd | Administrative & support | 2025 |
| Supersoul Academy Ltd | Information & communication | 2020 |
| Supply Care Limited | Administrative & support | 2003 |
| Support Services by Faith Ltd | Professional & scientific | 2025 |
| Supreme Electrical Limited | Construction | 2019 |
| Supremelight Care Services Ltd | Other services | 2018 |
| Surbiton Leisure Ltd | Hospitality | 2022 |
| Surej Strings Ltd | Wholesale & retail | 2026 |
| Surenity Ltd | Information & communication | 2025 |
| Surrex Periodontics Limited | Financial services | 2021 |
| Surrey Periodontics Limited | Health & social care | 2017 |
| Susan Morgan Consulting Limited | Professional & scientific | 2019 |
| Susie Bush Design Ltd | Professional & scientific | 2010 |
| Suzanne David Creations Ltd | Other services | 2018 |
| Sverigelotto Ltd | Arts & recreation | 2021 |
| Svhstudio Limited | Professional & scientific | 2018 |
| Svmm Limited | Construction | 2025 |
| Svsbc Ltd | Construction | 2025 |
| Swelltok Limited | Wholesale & retail | 2025 |
| Swift Cars Billericay Limited | Transport & logistics | 2019 |
| Swift Roofers Ltd | Construction | 2026 |
| Swift Solutions Services Ltd | Administrative & support | 2025 |
| Swiftcircuit Limited | Wholesale & retail | 2025 |
| Swiftix AI Ltd | Information & communication | 2024 |
| Swiftkill Ltd | Administrative & support | 2017 |
| Switched Controls Ltd | Manufacturing | 2023 |
| Sybaris Developments Limited | Construction | 2015 |
| Sycamore (2017) Limited | Professional & scientific | 2017 |
| Syed Capital Holdings Ltd | Real estate | 2024 |
| Syer & Sons Limited | Construction | 2017 |
| Sylvan Medical Limited | Health & social care | 2025 |
| Sylvan Properties Ltd | Real estate | 2017 |
| Sylverton Financial Services Limited | Information & communication | 2006 |
| Symes Collins LLP | | 2017 |
| Symmetry Beauty Ltd | Other services | 2015 |
| Synergy Dance Ltd | Arts & recreation | 2013 |
| Synta Limited | Information & communication | 2025 |
| Systemic Psychologists Ltd | Education | 2022 |
| Systems Marketing & Services Limited | Administrative & support | 2022 |
| Sytecross Limited | Real estate | 2001 |
| Sztradinguk Limited | Professional & scientific | 2014 |
| T & C Metal Recycling Limited | Water & waste | 2007 |
| T & P Glazing LLP | | 2003 |