| Stake and Chips Limited | Professional & scientific | 2003 |
| Stanton Ventures Ltd | Financial services | 2026 |
| Star in the Hoood Ltd | Wholesale & retail | 2025 |
| Star Painting and Decorating Ltd | Construction | 2021 |
| Star Powa Group Limited | Financial services | 2021 |
| Star Powa Limited | Wholesale & retail | 2018 |
| Starbones Limited | Construction | 2007 |
| Starchem Holdings Ltd | Financial services | 2025 |
| Starskyclouds Limited | Manufacturing | 2015 |
| Starsource Trading Limited | Real estate | 2005 |
| Start Safe Site Ltd | Information & communication | 2018 |
| Stat.M Limited | Real estate | 2024 |
| Staysafe (UK) Ltd | Construction | 2009 |
| Stein Mcbride Property Co. Limited | Real estate | 2016 |
| Stella & John Company Ltd | Wholesale & retail | 2021 |
| Stephen Draper Carpentry Ltd | Construction | 2026 |
| Stephen Price Limited | Transport & logistics | 2026 |
| Sterling Greenway Holdings Limited | Energy | 2013 |
| Sterling Greenway Investments Limited | Real estate | 2018 |
| Sterling Greenway Limited | Construction | 2012 |
| Sterling Physiotherapy Ltd | Health & social care | 2018 |
| Sterry Brickwork Ltd | Construction | 2023 |
| Sterry Electrical Solutions Ltd | Construction | 2024 |
| Steve Hobbs Coaching and Consulting Limited | Other services | 2015 |
| Steve James Consulting Limited | Construction | 2025 |
| Steward Fitness & Coaching Ltd | Health & social care | 2026 |
| STG Management (London) Limited | Real estate | 2009 |
| Stillwell Avenue Productions Limited | Extraterritorial | 2022 |
| STM Trading Ltd | Hospitality | 2025 |
| Stockton Estates Limited | Real estate | 1988 |
| Stockville Limited | Real estate | 2018 |
| Stoev 87 Ltd | Construction | 2018 |
| Stone Build Surfaces Ltd | Wholesale & retail | 2026 |
| Stoneleigh ENG Services Ltd | Administrative & support | 2022 |
| Store 12 Limited | Wholesale & retail | 2025 |
| Storm Guidance Limited | Financial services | 2014 |
| Storm Guidance Technologies Ltd | Information & communication | 2025 |
| Stort Advisory Ltd | Administrative & support | 2018 |
| Straight Lines Tattoo Ltd | Other services | 2024 |
| Stranger Than Paradise Productions Limited | Information & communication | 2016 |
| Strategic Wealth Consulting Ltd | Extraterritorial | 2019 |
| Stratford High Street Ventures Limited | Administrative & support | 2014 |
| Streamline Systems Limited | Manufacturing | 2026 |
| Stride Scty Limited | Wholesale & retail | 2026 |
| Stringle Songs Limited | Arts & recreation | 1987 |
| Strong Wills (Legal) Ltd | Professional & scientific | 2015 |
| Struan House Residents Association Limited | Households | 1986 |
| Stuart Court (Chingford) Residents Association Limited | Households | 1973 |
| Stuart Court Developments Limited | Extraterritorial | 2018 |
| Student Athlete Network Ltd | Education | 2018 |
| Studio 3 Developments Ltd | Construction | 2013 |
| Studio Rooms Essex Ltd | Other services | 2026 |
| Studio Sheridan Limited | Manufacturing | 2026 |
| Studio SL Ltd | Arts & recreation | 2025 |
| Stuta Sport Limited | Information & communication | 2020 |
| Style Paws Limited | Other services | 2010 |
| Styler Barber Limited | Other services | 2025 |
| Stylideas Limited | Wholesale & retail | 2011 |
| Stylish Hounds Limited | Other services | 2017 |
| Stylish Hounds Nutrition and Wellbeing Ltd | Other services | 2022 |
| Stylish Hounds Training Academy Ltd | Education | 2022 |
| Stylzio Limited | Wholesale & retail | 2023 |
| Subrosa Foods Ltd | Wholesale & retail | 2019 |
| Sufra Limited | Wholesale & retail | 2020 |
| Sugar Talent Limited | Arts & recreation | 2024 |
| Sukkah Depot Ltd | Wholesale & retail | 2020 |
| Sullcore Consulting Ltd | Professional & scientific | 2025 |
| Sullivan Brothers Ltd | Transport & logistics | 2025 |
| Sully Holdings Ltd | Financial services | 2023 |
| Summerbase Limited | Construction | 2000 |
| Summerbase Properties Limited | Real estate | 2004 |
| Sundance Financial Services Ltd | Financial services | 2002 |
| Sundec Limited | Construction | 2018 |
| Sunnys Solarium Limited | Other services | 2002 |
| Sunshine Breaks Ltd | Hospitality | 2023 |
| Supadance International Limited | Wholesale & retail | 1978 |
| Supagold Limited | Construction | 1983 |
| Super Boiler Ltd | Construction | 2021 |
| Superior Finish Loft Conversions Limited | Construction | 2015 |
| Supernaut Studio Ltd | Professional & scientific | 2016 |
| Supero Consultancy Ltd | Professional & scientific | 2019 |
| Superphone Repair Consultancy Ltd | Information & communication | 2022 |
| Supplement Check IT Ltd | Wholesale & retail | 2020 |
| Supplied Direct Ltd | Wholesale & retail | 2017 |
| Supply Staff Limited | Administrative & support | 2024 |
| Suprem Limited | Health & social care | 2014 |
| Supremelinens Services Ltd | Wholesale & retail | 2016 |
| Surecare Redbridge & Epping Forest Limited | Health & social care | 2016 |
| Surety & Guarantee Services Limited | Financial services | 2016 |
| Suri London Properties Holdings Limited | Households | 2022 |
| Suri London Properties Limited | Real estate | 2021 |
| Surrey Paediatrics Limited | Extraterritorial | 2011 |
| Surrey Paediatrics New Limited | Health & social care | 2014 |
| Sussex Property LLP | | 2015 |
| Sustainable Haus Developments (SHD) Ltd | Construction | 2013 |
| Suzan Issa Coaching Ltd | Health & social care | 2023 |
| Suzi Angelina Masterclass Ltd | Other services | 2021 |
| Suzi Angelina Studios Ltd | Other services | 2021 |
| SV Sports Therapy Ltd | Health & social care | 2022 |
| SVK Interiors Ltd | Construction | 2024 |