| Richardson Roofing Holdings Limited | Professional & scientific | 1998 |
| Richardson Traditional Limited | Construction | 2022 |
| Ride ME Ltd | Wholesale & retail | 2023 |
| Riverside Court (Bedfont) RTM Company Limited | Real estate | 2010 |
| Rmgj Ltd | Wholesale & retail | 2024 |
| Roni Hairdressing Ltd | Other services | 2012 |
| RTR Agencies Limited | | 1981 |
| Rudonixx Limited | Wholesale & retail | 2025 |
| Sagoo Holding Ltd | Professional & scientific | 2018 |
| Sampsu IT Solutions Ltd | Information & communication | 2020 |
| Scott Logistics Limited | Transport & logistics | 2004 |
| Scott-Cameron Limited | Professional & scientific | 2015 |
| Senior Authorised Solutions Ltd | Construction | 2011 |
| Servicenow UK Limited | Information & communication | 2007 |
| Shadowgrade Developments Limited | Hospitality | 1988 |
| Shergill Investments Limited | Real estate | 2018 |
| Shergill Residential Properties Limited | Real estate | 2020 |
| Shivrose Ltd | Information & communication | 2019 |
| Shree Ayurveda Health Limited | Health & social care | 2018 |
| Sigal Distribution Limited | Wholesale & retail | 2007 |
| Silver Wizard Electrical Limited | Construction | 2020 |
| Simple Seven Engineering Limited | Manufacturing | 2008 |
| Singh Foods Limited | Wholesale & retail | 2015 |
| Siri Trading Ltd | Wholesale & retail | 2017 |
| Socco Consultants Limited | Information & communication | 2005 |
| Solert Accounting Ltd | Professional & scientific | 2018 |
| Solumar Limited | Professional & scientific | 2011 |
| South East Rail Construction Limited | Construction | 2013 |
| South Midland Water Transport Limited | Extraterritorial | 2016 |
| Spearing Recovery Limited | Information & communication | 2002 |
| Sphinx Properties Limited | Real estate | 1987 |
| Splash Taverns Ltd | Hospitality | 2011 |
| Splinters Property Maintenance Ltd | Construction | 2015 |
| Squareview Limited | Administrative & support | 1986 |
| SSB Skilled Services Ltd | Construction | 2018 |
| Staines & Laleham Sports Association Limited | Arts & recreation | 1970 |
| Staines Accountants Ltd | Professional & scientific | 2016 |
| Staines Barbers Ltd | Other services | 2025 |
| Staines Boat Club Limited | Construction | 2009 |
| Staines Chiropractic Ltd | Health & social care | 2011 |
| Staines DRY Cleaners Limited | Other services | 2010 |
| Staines Machine Tool Co Limited | Wholesale & retail | 1958 |
| Staines Superstore Ltd | Wholesale & retail | 2025 |
| Stainton Consultancy Ltd | Manufacturing | 2006 |
| Starlite Marketing Limited | Professional & scientific | 2002 |
| Stephen Jones DP Services Ltd | Professional & scientific | 2011 |
| Straight Freight Limited | Transport & logistics | 1984 |
| Studio 60 Limited | Professional & scientific | 2011 |
| SUE Macpherson Consultancy Ltd | Professional & scientific | 2011 |
| Surrey Hills Group Ltd | Real estate | 2024 |
| Sustainable Maritime Solutions Limited | Professional & scientific | 2008 |
| Sweet Sensations Ltd | Hospitality | 2024 |
| TAI CHI City Limited | Health & social care | 2015 |
| Tailwind Capital Ltd | Administrative & support | 2024 |
| Tamil Friends Circle Ltd | Health & social care | 2022 |
| TAP Online Services Ltd | Administrative & support | 2025 |
| Teasdale & Metcalfe | Professional & scientific | 1925 |
| Tediophobes Ltd | Professional & scientific | 2024 |
| TFA Services Ltd | Information & communication | 2017 |
| Thamesair Consultancy Ltd | Administrative & support | 2015 |
| THE Barbershop Music Co Limited | Information & communication | 2008 |
| THE Bogfather Ltd | Construction | 2022 |
| THE Conifers Freehold Ltd | Households | 2019 |
| THE Fizzy Grape Ltd | Hospitality | 2023 |
| THE Grange (Staines) Freehold Ltd | Households | 2017 |
| THE Green Fabrics Ltd | Wholesale & retail | 2020 |
| THE Local Accountant & Tax Advisor Limited | Professional & scientific | 2009 |
| THE Maltings Residents Limited | Households | 1988 |
| THE Management Partners Limited | Professional & scientific | 2010 |
| THE Study Loop Limited | Wholesale & retail | 2025 |
| Thorpe LEA Dental Limited | Health & social care | 2013 |
| TKF Consultants Limited | Professional & scientific | 2005 |
| Transglobalconsultants Ltd | Information & communication | 2017 |
| Travelvet Limited | Other services | 2020 |
| Triegen Securities Limited | Professional & scientific | 1973 |
| Trotting Soles Travel Limited | Administrative & support | 2021 |
| Turner Coatings Limited | Construction | 2016 |
| Udlem Ltd | Real estate | 2016 |
| Uens UK Limited | Manufacturing | 2011 |
| UK Liaoning Business Association | Other services | 2018 |
| Unity Schools Trust | Education | 2011 |
| Vape Xtreme Ltd | Wholesale & retail | 2017 |
| Vereer Limited | Wholesale & retail | 2015 |
| Vermeulen's Heathrow Garden Centre | | 1991 |
| Virya Business Solutions Limited | Information & communication | 2018 |
| Vizzy Tech Limited | Information & communication | 2014 |
| Warkeed Solutions Ltd | Information & communication | 2025 |
| Wentworth Aura Limited | Other services | 2026 |
| Wick and Whimsy Ltd | Manufacturing | 2024 |
| Winter-Dunckley Limited | | 1980 |
| World by World UK Limited | Other services | 2021 |
| World Cargo Solutions Limited | Transport & logistics | 2008 |
| WTC Care Ltd | Health & social care | 2013 |
| Zaas Limited | Manufacturing | 2013 |
| Ziptech Services Ltd | Information & communication | 2004 |