| S & J Padfield (Contracts) Ltd | Construction | 2001 |
| S & J Padfield (Farms) Limited | Agriculture & fishing | 2013 |
| S & J Padfield (Lands) LLP | | 2021 |
| S & J Padfield Estates LLP | | 2013 |
| S & J Plant Services Limited | Water & waste | 2012 |
| S & J Properties Management Ltd | Real estate | 2018 |
| S & S Accident Repairs Ltd | Wholesale & retail | 2016 |
| S B Freights (International) Limited | Transport & logistics | 1976 |
| S Clark Surfacing Limited | Construction | 2008 |
| S GJ Thomas Ltd | Water & waste | 2025 |
| S Howe Facilities Management Ltd | Construction | 2013 |
| S J M Property Group Limited | Real estate | 2025 |
| S J Theobald & Sons Limited | Agriculture & fishing | 2012 |
| S L & G L Investments Limited | Real estate | 2023 |
| S M Scaffolding Services (UK) Limited | Construction | 2023 |
| S Merrick Ltd | Administrative & support | 2025 |
| S N B Holdings Limited | Professional & scientific | 2002 |
| S P Services London Ltd | Administrative & support | 2021 |
| S Star Limited | Transport & logistics | 2019 |
| S Urquhart Hygeinist Limited | Health & social care | 2022 |
| S V Payne Limited | Construction | 2019 |
| S&B International Limited | Wholesale & retail | 2022 |
| S&J Investment Holdings Ltd | Financial services | 2021 |
| S&K Hospitality Ltd | Hospitality | 2019 |
| S&S Electrical Services Ltd | Energy | 2016 |
| S&S Pest Control Ltd | Administrative & support | 2010 |
| S. Edward Consulting Ltd | Extraterritorial | 2019 |
| S. Herring Construction Limited | Construction | 1997 |
| S.A.B. Associate Services Limited | Energy | 2008 |
| S.B. Properties Limited | Real estate | 1996 |
| S.B.S. Kitchens Limited | Construction | 2003 |
| S.E. Price Ltd | Professional & scientific | 2023 |
| S.Farr and SON Property Limited | Real estate | 2015 |
| S.J.Rood & Company Limited | Professional & scientific | 1902 |
| S.S.C. Electrical Services Ltd | Construction | 2010 |
| S.T.A.N. Developments Limited | Real estate | 2016 |
| S4 Legacy Ltd | Real estate | 2025 |
| Sa-Mr Surgical Care Ltd | Health & social care | 2019 |
| Saar Partnership Limited | Health & social care | 2012 |
| Saar Properties Limited | Real estate | 2018 |
| SAB Professional Services Limited | Real estate | 2012 |
| SAB Traders Ltd | Wholesale & retail | 2018 |
| Saber Energy Ltd | Wholesale & retail | 2018 |
| Saber Group Ltd | Construction | 2023 |
| Sabin Transport Ltd | Transport & logistics | 2017 |
| Sabrina Rose Ltd | Hospitality | 2016 |
| Sach Plant Hire Limited | Construction | 2004 |
| Sadaf Fatima Limited | Administrative & support | 2023 |
| Safe Haven Sussex C.I.C. | Hospitality | 2016 |
| Safehands Live in Care Ltd | Health & social care | 2013 |
| Safemall Property Management Limited | Households | 1989 |
| Saferclean Limited | Other services | 2016 |
| Safeside Supported Living Services Ltd | Administrative & support | 2021 |
| Safety Inspections and Training Ltd | Other services | 2015 |
| Saffron Essex Ltd | Hospitality | 2025 |
| Saffron Henna Ltd | Professional & scientific | 2016 |
| Sage Eleven Limited | Other services | 2020 |
| Sagkat Ltd | Real estate | 2019 |
| Sahara Shutters Ltd | Other services | 2022 |
| SAI Global Assurance Services Ltd | Professional & scientific | 1998 |
| SAI Global CIS UK Limited | Professional & scientific | 2010 |
| Saiadiarya Ltd | Health & social care | 2025 |
| Sais Enterprises Limited | Real estate | 2020 |
| Sal's Engineering Ltd | Construction | 2016 |
| Sales Geek East Ltd | Administrative & support | 2024 |
| Sales Progression Hub Ltd | Real estate | 2026 |
| Salih Anatolian Corner Ltd | Hospitality | 2025 |
| Saltees Properties Limited | Real estate | 1988 |
| SAM Sparks Limited | Construction | 2021 |
| Samaco Limited | Health & social care | 2019 |
| Samantha Hart Design Ltd | Manufacturing | 2026 |
| Samc Limited | Professional & scientific | 2015 |
| Same Star Ltd | Arts & recreation | 2019 |
| Same Star Yoga School Ltd | Education | 2019 |
| Samjam Properties Limited | Real estate | 2021 |
| Sams Indi Food Ltd | Hospitality | 2026 |
| Samuel Innovations Ltd | Construction | 2017 |
| Samuel Marlow Limited | Information & communication | 2010 |
| Samwyte Builders Ltd | Construction | 2018 |
| SAN SOL Ltd | Information & communication | 2026 |
| SAN Valley Engines Limited | Wholesale & retail | 2024 |
| Sand and Stone Ltd | Mining & quarrying | 2020 |
| Sandpit Lane Brentwood Limited | Real estate | 2017 |
| Sandypanda Ltd | Information & communication | 2014 |
| Sankoh Property Limited | Real estate | 2025 |
| Sannaz Limited | Professional & scientific | 2022 |
| Sanven Ltd | Health & social care | 2016 |
| Sapp Properties Ltd | Real estate | 2025 |
| Sapper Consulting Limited | Administrative & support | 2016 |
| Sapphire Flooring Services Ltd | Construction | 2023 |
| Sapphire Mechanical UK Limited | Manufacturing | 2012 |
| Sarantos at Home Ltd | Real estate | 2021 |
| Sarazen Enterprises Limited | Information & communication | 2010 |
| Sarr Innovations Limited | Wholesale & retail | 2019 |
| Sarvam Services Ltd | Administrative & support | 2021 |
| SAS Elite Maintenance Ltd | Administrative & support | 2024 |
| Sasoa Ltd | Wholesale & retail | 2018 |
| Sathiya Property Ltd | Wholesale & retail | 2022 |
| Sathiya Real Estate Ltd | Real estate | 2025 |
| Saturn Holdings PLC | Financial services | 2021 |