| Spyers Court Management Limited | Households | 2001 |
| Square Carpentry&Joinery Ltd | Manufacturing | 2022 |
| Squires Pet Services Ltd | Professional & scientific | 2016 |
| Squirrels Accountants Ltd | Professional & scientific | 2021 |
| ST Denis Management Co Ltd | Households | 2018 |
| ST Photos Limited | Professional & scientific | 2013 |
| ST. Paul's Court Management Company Limited | Households | 1982 |
| Stammerless Limited | Education | 2012 |
| Stat Systems Limited | Professional & scientific | 2009 |
| Steepal Limited | Wholesale & retail | 1969 |
| Steeple Point Management Company Limited | Households | 2000 |
| Stephen Boyton Hospitality Limited | Professional & scientific | 2009 |
| Stone Private Finance Ltd | Financial services | 2024 |
| Stonecrest Monumental Stonemasons Ltd | Other services | 2014 |
| Strategic Views Ltd | Administrative & support | 2025 |
| Stratfield House Management Company Ltd | Households | 2016 |
| Strativa Ltd | Professional & scientific | 2026 |
| Stratos Quant Ltd | Financial services | 2025 |
| Strawberry JAM Limited | Real estate | 2016 |
| Studio Reformer Limited | Arts & recreation | 2025 |
| Studio Rigging Limited | Information & communication | 2008 |
| Subsea Survey Ltd | Professional & scientific | 2013 |
| Sunaction Limited | Arts & recreation | 1988 |
| Swifty Drop UK Ltd | Transport & logistics | 2026 |
| Sycamore Press Limited | Manufacturing | 2001 |
| Sydenham House Ltd | Financial services | 2020 |
| Sylvan Oakham Management Company Limited | Households | 2008 |
| SYS Engineering Consultancy Ltd | Professional & scientific | 2018 |
| T BYE Builders Limited | Construction | 1984 |
| T Carey Rigging Limited | Information & communication | 2013 |
| Tailor Education Ltd | Education | 2025 |
| Tamar Way Residents Limited | Households | 1994 |
| TAO Communications Ltd | Professional & scientific | 2019 |
| Tara Capital Limited | Financial services | 2024 |
| Taylor Hanson Limited | Transport & logistics | 2010 |
| Taylor Hanson Travel Executive Limited | Transport & logistics | 2021 |
| Teachlens Ltd | Professional & scientific | 2025 |
| Teal Development Management Ltd | Real estate | 2023 |
| Techtalk Limited | Other services | 1991 |
| Teckam UK Limited | Real estate | 2017 |
| Tecmac (UK) Limited | Professional & scientific | 2013 |
| Tecza Solutions Limited | Information & communication | 2014 |
| TEM Carpentry Limited | Construction | 2018 |
| Tenergy Consulting Ltd | Professional & scientific | 2017 |
| Tenniel Homes Ltd | Construction | 2018 |
| Tenzing Change Ltd | Professional & scientific | 2008 |
| Tess Property Portfolio Ltd | Real estate | 2025 |
| Thames Vale Advanced Motorcyclists | Other services | 1998 |
| Thames Valley Carpet and Flooring Ltd | Construction | 2012 |
| THE Allround Creative Agency NO 5 Limited | Information & communication | 2017 |
| THE Bridge Apartments Residents Company Limited | Households | 2005 |
| THE Consulting House Ltd | Professional & scientific | 2025 |
| THE Convenient Cube Ltd | Wholesale & retail | 2024 |
| THE Croissant Café 2019 Ltd | Hospitality | 2019 |
| THE DAX Deli Ltd | Hospitality | 2025 |
| THE Flower Basket 45 Ltd | Wholesale & retail | 2019 |
| THE Great Outdoors Club Ltd | Other services | 2023 |
| THE Hive Craft Ltd | Wholesale & retail | 2020 |
| THE Homestead (Crowthorne) Limited | Health & social care | 2007 |
| THE Isles Apartments Ltd | Real estate | 2022 |
| THE Isles Freehold Company Ltd | Extraterritorial | 2022 |
| THE Light Blue Category Consultancy Ltd | Professional & scientific | 2023 |
| THE Maltings (Norton Road) Management Company Limited | Households | 1999 |
| THE Manor Management (Sutton Courtenay) Limited | Households | 2000 |
| THE Musaabi's Limited | Health & social care | 2015 |
| THE Nodding Donkey Artisan Distillery Limited | Manufacturing | 2024 |
| THE Peoplex Group Ltd | Administrative & support | 2024 |
| THE Pet Office Ltd | Wholesale & retail | 2022 |
| THE Photo Swap Company Limited | Information & communication | 2018 |
| THE Pines (2) Residents Association Limited | Households | 1990 |
| THE Saleh Network Ltd | Information & communication | 2025 |
| THE Surrey Property Network Ltd | Construction | 2026 |
| THE Wind Chime Shop Limited | Wholesale & retail | 2009 |
| Thinking in Shades of Grey Ltd. | Education | 2006 |
| Third GEN Services Ltd | Extraterritorial | 2021 |
| Third Generation Services Ltd | Construction | 2018 |
| Third Generation Surfacing Limited | Construction | 2025 |
| Thrive Wellbeing Consultancy Limited | Professional & scientific | 2014 |
| Thriving Solutions Ltd | Professional & scientific | 2021 |
| TIA Pharma Services Ltd | Professional & scientific | 2024 |
| Tiddles Properties Ltd | Real estate | 2021 |
| Titan 2020 Limited | Professional & scientific | 1990 |
| Titan OT Limited | Information & communication | 2024 |
| Titan RC Structures Ltd | Construction | 2025 |
| TJR Stunts Ltd | Information & communication | 2023 |
| TMI Systems Limited | Information & communication | 2008 |
| Tomiron Limited | Information & communication | 2000 |
| Top Rides Group Ltd | Wholesale & retail | 2020 |
| Toro Aviation Ltd | Transport & logistics | 2018 |
| Tower Interim Ltd | Professional & scientific | 2015 |
| TPB Coaching Ltd | Education | 2025 |
| TPB Events Ltd | Arts & recreation | 2025 |
| TPB Shop Ltd | Wholesale & retail | 2025 |
| Treadstone Services Limited | Information & communication | 2015 |
| Treasury Experts Ltd | Information & communication | 2024 |
| Trip Trans Ltd | Transport & logistics | 2026 |
| Triven Ltd | Real estate | 2011 |
| Troop Music Limited | Arts & recreation | 2023 |
| Truly Semiconductors (UK) Ltd | Administrative & support | 2019 |
| TRY a Horse Ltd | Arts & recreation | 2024 |