| SRR International Limited | Transport & logistics | 2019 |
| Srtech Ltd | Information & communication | 2020 |
| Srvalentim Services Limited | Transport & logistics | 2026 |
| SRY Pharma QA Consultancy Ltd | Professional & scientific | 2019 |
| SS Car Care Ltd | Wholesale & retail | 2018 |
| SS Construction Uxbridge Ltd | Construction | 2024 |
| SS Foods Ltd | Wholesale & retail | 2016 |
| SS Heat Works Ltd | Construction | 2019 |
| SS Japan Trading Ltd | Wholesale & retail | 2023 |
| SS Marketing Ltd | Wholesale & retail | 2023 |
| SS Radiology UK Ltd | Professional & scientific | 2026 |
| SS3 Investments Limited | Real estate | 2018 |
| SSA Dwellings Limited | Real estate | 2020 |
| Ssan Properties Limited | Real estate | 2002 |
| SSB Developers Ltd | Real estate | 2026 |
| SSB Engineering Ltd | Professional & scientific | 2020 |
| SSB Investors Ltd | Real estate | 2026 |
| SSBM21 Ltd | Transport & logistics | 2021 |
| Sscj Limited | Professional & scientific | 2024 |
| SSD Tiles & Bathroom Installation Specialist Ltd | Construction | 2023 |
| Ssjmt Investments Ltd | Financial services | 2023 |
| SSK Mortgage Limited | Financial services | 2022 |
| Sskm Enterprises Ltd | Wholesale & retail | 2021 |
| SSM Holding Ltd | Real estate | 2026 |
| SSM London Properties Limited | Households | 2023 |
| SSM Production Limited | Information & communication | 2025 |
| SSP Tech Ltd | Administrative & support | 2025 |
| SSS Consulting Group Limited | Professional & scientific | 2025 |
| ST Clare Holdings Limited | Financial services | 2026 |
| ST Clare Holly Road Limited | Financial services | 2026 |
| ST Clare Property Limited | Real estate | 2025 |
| ST Crispin House RTM Company Ltd | Households | 2025 |
| ST Johns Residents Company Limited | Households | 2000 |
| ST Leonards Farmyard LLP | | 2021 |
| ST Michaels Croydon (NO 1) Management Company Limited | Real estate | 2022 |
| ST Michaels Croydon (Tower B) Management Company Limited | Households | 2022 |
| ST Raphael's House Limited | Households | 1995 |
| ST WIN Chicken Ltd | Hospitality | 2025 |
| ST. James' Court Management Company Limited | Households | 1981 |
| ST. Johns Residents Freehold Company Limited | Households | 2006 |
| ST. Katharines Holdings Ltd | Financial services | 2015 |
| Stablecare Limited | Health & social care | 2019 |
| Stacked N Sliced Limited | Hospitality | 2026 |
| Staffaid Limited | Administrative & support | 2016 |
| Stage Line Transport Ltd | Transport & logistics | 2023 |
| Stage Painting Ltd | Construction | 2023 |
| Stage SET Productions Ltd | Administrative & support | 2016 |
| Stagetech Ltd | Construction | 2025 |
| Stallion Glazing Ltd | Construction | 2025 |
| Standard Cleaning Ltd | Construction | 2025 |
| Stanley 32 Ltd | Real estate | 2021 |
| Stanley 35 Ltd | Real estate | 2021 |
| Star Airport Transfers Ltd | Transport & logistics | 2022 |
| Star Alliance Ltd | Wholesale & retail | 2018 |
| Star Ally Ltd | Real estate | 2016 |
| Star Building & Construction Work Limited | Construction | 2009 |
| Star Gates Limited | Extraterritorial | 2005 |
| Star Traders (UK) Limited | Wholesale & retail | 2005 |
| Starboard Music Group Ltd | Information & communication | 2021 |
| Starion International Limited | Wholesale & retail | 1984 |
| Starlight Motors & Car Wash Ltd | Wholesale & retail | 2022 |
| Starman Technologies Limited | Professional & scientific | 2022 |
| Startcentral Property Management Limited | Households | 1992 |
| Station Hand Car Wash (Hillingdon) Limited | Other services | 2006 |
| Stay Amaze Limited | Real estate | 2024 |
| Stay at Home Care Services Ltd | Administrative & support | 2022 |
| Stay Noisey Limited | Information & communication | 2021 |
| Steadcore IT Limited | Information & communication | 2020 |
| Steadfast Projects Ltd | Real estate | 2026 |
| Stealth Luxury Clothing Ltd | Wholesale & retail | 2025 |
| Steam Clean Services Limited | Transport & logistics | 2009 |
| Steel Safety Systems Ltd | Other services | 2017 |
| Stefan Electrical Ltd | Construction | 2015 |
| Stela Clean Ltd | Administrative & support | 2013 |
| Stemy Engineering Ltd | Professional & scientific | 2025 |
| Stepping Stones Academy Childcare Ltd. | Health & social care | 2013 |
| Stepping Stones Academy Ltd | Health & social care | 2020 |
| Stepup Care Limited | Health & social care | 2007 |
| Stepup Floors Limited | Wholesale & retail | 2026 |
| Stepup Homes Limited | Real estate | 2015 |
| Sterling Dental Surgeries Limited | Health & social care | 1948 |
| Sterling International Group Limited | Professional & scientific | 2000 |
| Sterling International Holdings Limited | Professional & scientific | 1999 |
| Sterling Relocation Limited | Transport & logistics | 1991 |
| Sterling Span Advisory Limited | Professional & scientific | 2026 |
| Steve GAS and Plumbing Services Ltd | Construction | 2018 |
| Steve Paul Walsh Limited | Information & communication | 2017 |
| Steven Ames Limited | Professional & scientific | 2012 |
| Stevenson Roofing Limited | Construction | 2012 |
| STH Group Ltd | Financial services | 2016 |
| Stockley Auto & MOT Limited | Wholesale & retail | 2013 |
| Stockley Environmental (South East) LLP | | 2020 |
| Stockley Environmental Limited | Financial services | 2018 |
| Stockley Excavations Limited | Construction | 2020 |
| Stockley Group Limited | Financial services | 2020 |
| Stockley Holdings Limited | Extraterritorial | 2020 |
| Stockley Marquees LLP | | 2016 |
| Stockley Park East Limited | Real estate | 1997 |
| Stockley Park Golf Club Limited | Arts & recreation | 2003 |
| Stockly Cars Ltd | Wholesale & retail | 2025 |