| Strategic Results Limited | Professional & scientific | 2007 |
| Stringers Cottages Residents Limited | Households | 1986 |
| Stronglog Limited | Information & communication | 1989 |
| Stuart Thomas Associates Limited | Professional & scientific | 1995 |
| Sun Management Ltd | Information & communication | 2013 |
| Sunnyside Property Company Limited | Real estate | 2003 |
| Sunshine Capital Investments Limited | Real estate | 2018 |
| Supermarine Vickers Ltd | Administrative & support | 2006 |
| Superreach Ltd | Information & communication | 2022 |
| Supreme IT Solutions Limited | Information & communication | 2005 |
| Surgx Ltd | Education | 2021 |
| Susan's Property & Management Ltd. | Hospitality | 2007 |
| Sussex Plumbing Supplies Limited | Wholesale & retail | 2000 |
| Sutherland Developments Limited | Real estate | 1991 |
| Swanbourne Home Farms | | 2006 |
| Sycamore Place Management Company Limited | Households | 2001 |
| Syke Cluan (Iver) Management Company Limited | Professional & scientific | 2008 |
| Symrise Limited | Manufacturing | 1966 |
| Syteck Ltd | Information & communication | 2007 |
| Sytel Limited | Information & communication | 1994 |
| T a F Components Limited | Administrative & support | 2006 |
| T and T Partners Limited | Professional & scientific | 2008 |
| T.K.D Security Services Limited | Administrative & support | 2012 |
| Tailgleamlamps Ltd | Wholesale & retail | 2025 |
| Talent Transitions Limited | Professional & scientific | 2008 |
| Tang International Limited | Wholesale & retail | 2026 |
| Taulis Limited | Agriculture & fishing | 2018 |
| Tawsen Ltd | Professional & scientific | 2006 |
| Technibond Limited | Manufacturing | 1981 |
| Technical Exponents Limited | Professional & scientific | 1952 |
| Tenace Accountants Ltd | Professional & scientific | 2025 |
| Terence James Systems Limited | Information & communication | 1985 |
| Textaccompli Translations Ltd | Professional & scientific | 2000 |
| THE App Designer Limited | Information & communication | 2015 |
| THE Beeches West Wycombe Limited | Real estate | 1997 |
| THE Birch Drive Management Company Limited | Households | 1995 |
| THE Blues Development Fund Limited | Other services | 1987 |
| THE Brayfield Estate | | 1997 |
| THE British Dental Industry Association | Other services | 1997 |
| THE British Wheelchair Sports Foundation Limited | Arts & recreation | 1972 |
| THE Brooklands Centre | Health & social care | 2007 |
| THE Courier Company (UK) Limited | Transport & logistics | 1993 |
| THE Executive Athlete Limited | Professional & scientific | 2004 |
| THE Hyvv Ltd | Information & communication | 2025 |
| THE Life Skills Trust | Education | 2007 |
| THE Lifestyle Doctors Ltd | Health & social care | 2011 |
| THE Marketing Directors Limited | Information & communication | 2004 |
| THE Nearly Famous Company Limited | Professional & scientific | 1988 |
| THE Perrys Management Company Limited | Real estate | 1990 |
| THE Plant Specialist (Nursery) Limited | Agriculture & fishing | 2005 |
| THE Professional Beauty Group Limited | Other services | 2019 |
| THE Provision Masters Limited | Hospitality | 1993 |
| THE Red Book Consultancy Limited | Administrative & support | 2006 |
| THE Roald Dahl Centre (Trading) Limited | Arts & recreation | 2003 |
| THE Roald Dahl Museum and Story Centre | Arts & recreation | 2001 |
| THE Slade Recreation Club Limited | Arts & recreation | 1992 |
| THE Tranceforming Team Limited | Professional & scientific | 2005 |
| THE Woodend Partnership | | 1988 |
| Thompson Wilson Limited | Professional & scientific | 1999 |
| Tiger's Towel Studio Limited | Wholesale & retail | 2025 |
| Tilsworth Consultancy Ltd | Real estate | 2002 |
| Tilsworth Consultants Ltd | Real estate | 2002 |
| TIM West Limited | Construction | 2006 |
| Timtim Limited | Professional & scientific | 2002 |
| Tipping Enterprises Limited | Information & communication | 2006 |
| TIQ UK Acquisitions Limited | Financial services | 2018 |
| TIQ UK Finance Limited | Financial services | 2018 |
| TIQ UK Midco Limited | Financial services | 2018 |
| Titan Ecommerce Ltd | Wholesale & retail | 2025 |
| Tomolek Ltd | Construction | 2006 |
| Top Farm Close Holtspur Limited | Extraterritorial | 2000 |
| TOT Hots Rigging Services Ltd | Construction | 2025 |
| Total Drain Care Limited | Construction | 2006 |
| Total Hygiene Consultancy Limited | Water & waste | 2002 |
| Trading Together Ltd | Wholesale & retail | 2026 |
| Trevor Walker Associates Limited | Professional & scientific | 2002 |
| Triage Solutions Limited | Information & communication | 2013 |
| Tribal Addict Limited | Other services | 2001 |
| Tricolore Great Britain Limited | Other services | 1992 |
| Trinity Peaks Property Management Company Ltd | Professional & scientific | 2016 |
| Triumph Star International Ltd | Households | 2023 |
| Trustworth Group Limited | Professional & scientific | 2003 |
| TSL Holdings Ltd | Financial services | 2026 |
| TT Training Consultants Limited | Professional & scientific | 2006 |
| Tuskar Construction Services Limited | Construction | 1996 |
| Two-Shot Moulding Limited | Manufacturing | 2001 |
| Tympani Productions Ltd. | Information & communication | 2001 |
| UAN Trading Ltd | Wholesale & retail | 2025 |
| UHG Holdings UK VII Limited | Financial services | 2023 |
| Unified Process Mentors Limited | Real estate | 2001 |
| Uniq European Foods Limited | Professional & scientific | 1946 |
| United Holdings & Investments Limited | | 2002 |
| US Gems Empire Limited | Wholesale & retail | 2025 |
| V S I Enterprises Limited | Information & communication | 1994 |
| V21 Limited | Transport & logistics | 1997 |
| VAG London Ltd | Wholesale & retail | 2025 |
| Vale Training Services Limited | Education | 2006 |
| Valerie Wark Associates Limited | Professional & scientific | 2000 |
| Vanquish Property Development Limited | Construction | 2019 |
| Variiety Vault Ltd | Wholesale & retail | 2024 |