| Sports 4 Tots Franchising Ltd | Other services | 2016 |
| Sports 4 Tots Virtual Limited | Education | 2022 |
| SPORTS4TOTS Limited | Education | 2012 |
| SS Carpentry & Construction Ltd | Construction | 2023 |
| SSM Ignisafe Fire Protection Ltd | Public administration | 2026 |
| ST Ives Room Rentals Ltd | Real estate | 2026 |
| Stennack Farm Weddings Limited | Administrative & support | 2020 |
| Stove Care Limited | Construction | 2014 |
| Streetmap.Eu Limited | Information & communication | 2005 |
| Sultanz Cornwall Limited | Hospitality | 2019 |
| Summor Ltd | Real estate | 2025 |
| Superior Fencing Limited | Construction | 1999 |
| Sweet PEA Ecodesign Ltd | Professional & scientific | 2020 |
| Sweets & Treats Cornwall Ltd | Wholesale & retail | 2024 |
| Swqs Ltd | Professional & scientific | 2014 |
| T a Design and Build Ltd | Other services | 2020 |
| Talkmorecornwall CIC | Education | 2019 |
| Tech Mill Services Ltd | Professional & scientific | 2022 |
| Tehidy Gardens Management Company Limited | Households | 1972 |
| Tehidy Park Golf Club Ltd | Arts & recreation | 2021 |
| Tessali Limited | Transport & logistics | 2009 |
| THE Camborne Back Clinic Limited | Health & social care | 2011 |
| THE Collective Roundtables Limited | Administrative & support | 2024 |
| THE Cornish Heating Company Ltd | Construction | 2021 |
| THE Cornwall Brass Band Association | Professional & scientific | 2009 |
| THE Electric Playground Limited | Construction | 2014 |
| THE Fertility Sanctuary Ltd | Health & social care | 2024 |
| THE Gardening Company Cornwall Ltd | Administrative & support | 2024 |
| THE Guerrillaz Limited | Professional & scientific | 2020 |
| THE Holiday Changeover Team Ltd | Administrative & support | 2025 |
| THE International Rubber Duck Company Limited | Wholesale & retail | 2022 |
| THE Loss Adjuster Film Limited | Information & communication | 2019 |
| THE Luxury Cornish Hamper Co Ltd | Wholesale & retail | 2021 |
| THE Mighty Anglers CIC | Agriculture & fishing | 2023 |
| THE Natural Edit Ltd | Health & social care | 2026 |
| THE Padball Boxing Company Ltd | Administrative & support | 2017 |
| THE Snatch Corporation (UK) Ltd. | Wholesale & retail | 1999 |
| THE Track Hub C.I.C. | Education | 2023 |
| THE Ultra Violets Music Ltd | Information & communication | 2025 |
| THE Water Shed Barripper CIC | Administrative & support | 2025 |
| The-Cactus-Archive Ltd | Agriculture & fishing | 2020 |
| This IS Thrivespace Limited | Information & communication | 2021 |
| Thomas Mechanical Electrical Ltd | Construction | 2014 |
| Thorpe-Stanley Limited | Extraterritorial | 2023 |
| TIM Dunkley Limited | Households | 2012 |
| Timeless Expressions Limited | Health & social care | 2016 |
| Tiobalase Limited | Hospitality | 2026 |
| TNT the Gym Limited | Arts & recreation | 2024 |
| Tome Logistics Ltd | Transport & logistics | 2024 |
| Tonick Business Publishing Limited | Information & communication | 2005 |
| Top 1 Barbers (Cornwall) Ltd | Other services | 2026 |
| Top Nails & Spa 38 Ltd | Other services | 2023 |
| Topknotch Carpentry Services Ltd | Manufacturing | 2024 |
| Tracey Rail BSL Interpreter Ltd | Professional & scientific | 2022 |
| Trader Cloud Ltd | Real estate | 2024 |
| Traditional Window Cleaning Limited | Administrative & support | 2019 |
| Trees and Bees Cornwall Ltd | Administrative & support | 2021 |
| Treleigh Property Management Company Ltd | Households | 2019 |
| Treswithian Barns Management Company Ltd | Households | 2023 |
| Treverbyn Property Maintenance Ltd | Construction | 2021 |
| Trevines Cafe and Bar Limited | Hospitality | 2025 |
| Trevithick Business Hub Limited | Real estate | 2025 |
| Triggerpoint Research Ltd | Financial services | 2024 |
| Trish Bawden LLP | | 2015 |
| TRU Renovations Limited | Administrative & support | 2007 |
| Trudy Ward Consulting Limited | Professional & scientific | 2025 |
| True Hearts and Minds Limited | Health & social care | 2022 |
| True Joinery Ltd | Manufacturing | 2024 |
| True Shine Cleaners Ltd | Administrative & support | 2021 |
| Trusteddataworks Ltd | Administrative & support | 2010 |
| TSE House 168 Ltd | Hospitality | 2023 |
| Tuss Limited | Professional & scientific | 1999 |
| Ultra Roofing Limited | Construction | 2023 |
| Undercover Developments Ltd | Construction | 2025 |
| Undercover Energy Ltd | Manufacturing | 2021 |
| Undercover Group Ltd | Financial services | 2025 |
| Undercover Laundry Services and Linen Hire Ltd | Other services | 2019 |
| Undercover Zero Research and Development Centre Limited | Manufacturing | 2020 |
| Underground Solutions Limited | Construction | 2011 |
| Vape Zone X Ltd | Wholesale & retail | 2026 |
| Vean House Management Limited | Households | 2010 |
| Verveine Capital Limited | Financial services | 2021 |
| Virtual Construct Limited | Administrative & support | 2007 |
| Vlst Limited | Wholesale & retail | 2023 |
| Void Beyond Games Ltd | Wholesale & retail | 2024 |
| VR Building Contractors Ltd | Construction | 2025 |
| Vyouz Ltd | Water & waste | 2006 |
| Walker’S Building Services (Cornwall) Limited | Construction | 2025 |
| Waller & Hart Solicitors Limited | Professional & scientific | 2015 |
| Walters & Barbary LLP | | 2014 |
| Wandering OX CIC | Other services | 2023 |
| Warnes Landscaping Ltd | Administrative & support | 2025 |
| Warrior Warehouses Limited | Wholesale & retail | 1975 |
| Way Above Consultancy Limited | Information & communication | 2019 |
| We-Perk Ltd | Administrative & support | 2026 |
| Webber and SON Builders Ltd | Construction | 2021 |
| Weeth Holdings Ltd | Real estate | 2024 |
| West Cornwall Therapies Ltd | Other services | 2019 |
| West Midlands Property Lettings & Management Ltd | Real estate | 2021 |
| Westcountry Classics Limited | Professional & scientific | 2005 |