| Srips HR Ltd | Information & communication | 2014 |
| Srishi Ltd | Real estate | 2023 |
| Sristi Consulting Services Ltd | Information & communication | 2013 |
| Srisureka Ltd | Professional & scientific | 2012 |
| SRK Design and Build Ltd | Construction | 2020 |
| SRL Consulting Limited | Real estate | 2026 |
| Srm's Enterprises Ltd | Wholesale & retail | 2013 |
| SRP Estate Limited | Real estate | 2024 |
| SRR Coaching Ltd | Arts & recreation | 2022 |
| SRS Wealth Advisory Services Limited | Administrative & support | 2006 |
| SS Config Limited | Information & communication | 2011 |
| SS Consulting (London) Ltd | Administrative & support | 2016 |
| SS UK Transport Ltd | Transport & logistics | 2025 |
| SSC Workshop Ltd | Wholesale & retail | 2025 |
| Ssdengineering Limited | Professional & scientific | 2014 |
| Ssee Ltd | Health & social care | 2022 |
| SSJ Apex Ltd | Information & communication | 2026 |
| SSK Associates Private Limited | Other services | 2020 |
| Sskap Ltd | Real estate | 2026 |
| SSN Property Limited | Real estate | 2025 |
| SSS Ceilings Limited | Construction | 2015 |
| ST Clothing Limited | Manufacturing | 2012 |
| ST Georges 83 Limited | Households | 2000 |
| ST Georges Limited | Administrative & support | 1999 |
| ST Georges Pest Control Ltd | Other services | 2007 |
| ST Katherine House Management Limited | Households | 2020 |
| ST Moves Ltd | Transport & logistics | 2022 |
| ST Stephens Ltd | Health & social care | 2013 |
| ST UK Transport Ltd | Transport & logistics | 2021 |
| St&Z Ltd | Real estate | 2024 |
| ST. Andrew's Anaesthetists Group LLP | | 2010 |
| ST. Anne's Dental Supply Co. Limited | Administrative & support | 2009 |
| ST. Clare's Hospice | Health & social care | 1991 |
| ST. Giles Homes Limited | Health & social care | 1994 |
| ST. Giles Property Developments Limited | Construction | 1993 |
| ST. John Shops - Essex Ltd | Wholesale & retail | 2026 |
| ST. Marys Court Management (Maldon) Limited | Households | 1993 |
| St.Cedd's School Educational Trust Limited | Education | 1964 |
| ST1 Plumbing Limited | Construction | 2016 |
| Stableford Green (Bishop's Stortford) Residents Management Company Limited | Households | 2021 |
| Stacarac (UK) Limited | Manufacturing | 1985 |
| Stacarac Corporation Limited | Manufacturing | 2018 |
| Stace Print Ltd | Manufacturing | 2011 |
| Stacey England Photography Limited | Professional & scientific | 2011 |
| Stacey Farms Limited | Financial services | 2014 |
| Stadova Ltd | Wholesale & retail | 2020 |
| Stadshaven Services Ltd | Professional & scientific | 2025 |
| Stagex Automotive Ltd | Wholesale & retail | 2017 |
| Stallard & Co Limited | Professional & scientific | 2014 |
| Stamford Traditional Builders Ltd | Construction | 2011 |
| Stamm Limited | Extraterritorial | 2022 |
| Stan Fung Consultancy Ltd | Real estate | 2024 |
| Stanford-Le-Hope Property Leasing Company Limited | Real estate | 2003 |
| Stanger Kirkwood Limited | Administrative & support | 2006 |
| Stanley & Davis Ltd | Administrative & support | 2021 |
| Stanley Rise Traders Limited | Wholesale & retail | 2019 |
| Star 55 Limited | Wholesale & retail | 2012 |
| Star Brokers Ltd | Financial services | 2020 |
| Star Chronicles Limited | Information & communication | 2016 |
| Star Radiology Interviews Ltd | Education | 2024 |
| Star Team Cleaning & Carpeting Limited | Administrative & support | 2013 |
| Star Team Cleaning Company Ltd | Administrative & support | 2012 |
| Star Team Services Ltd | Administrative & support | 2014 |
| Starburst Displays Limited | Arts & recreation | 2008 |
| Starlight Healthcare Services Ltd | Health & social care | 2023 |
| Starlight Home Improvements Limited | Construction | 2025 |
| Starline Care Group Limited | Health & social care | 2022 |
| Starling Fabrications Ltd | Manufacturing | 2022 |
| Starr Brothers Films Limited | Professional & scientific | 2020 |
| Stars Aerial Dance Limited | Arts & recreation | 2017 |
| STARS9 Ltd | Real estate | 2022 |
| Static WAX Records Ltd | Information & communication | 2018 |
| Station Mews RTM Company Limited | Households | 2009 |
| STC Consulting Limited | Hospitality | 1999 |
| STC Enterprise Limited | Wholesale & retail | 2022 |
| Stealth Partnership UK Limited | Real estate | 2009 |
| Stealth Sportswear Ltd | Wholesale & retail | 2025 |
| Stedwick Limited | Administrative & support | 2025 |
| Steelbrook Ltd | Wholesale & retail | 2025 |
| Steeltech Engineering Ltd | Professional & scientific | 2015 |
| Stema Global Associates Limited | Health & social care | 2026 |
| Stemac Limited | Real estate | 2024 |
| Stemar Group Holdings Ltd | Professional & scientific | 2024 |
| Stendal Consulting & Investments Ltd | Information & communication | 2023 |
| Stenmart Ltd | Real estate | 2020 |
| Stennack Holdings Limited | Real estate | 2023 |
| Step 31 Ltd | Wholesale & retail | 2024 |
| Step Start Ltd | Administrative & support | 2017 |
| Step Start Management Ltd | Administrative & support | 2021 |
| Step Start Nurseries Bocking Ltd | Health & social care | 2020 |
| Step Start Nurseries Chelmsford Ltd | Education | 2024 |
| Step Start Nurseries Fyfield Ltd | Education | 2023 |
| Step Start Nurseries Heybridge Ltd | Health & social care | 2020 |
| Step Start Nurseries Mountnessing Ltd | Health & social care | 2017 |
| Step Start Nurseries Ongar Ltd | Education | 2025 |
| Step Start Nurseries Witham Ltd | Health & social care | 2023 |
| Step Start Team Ltd | Administrative & support | 2022 |
| Stephen Alexander Hair Ltd | Other services | 2018 |
| Stephen Shaw Limited | Professional & scientific | 2004 |
| Stephenade Ltd | Real estate | 2021 |