| Steiner and Baker Limited | Hospitality | 2016 |
| Stephen Daoud Design Limited | Professional & scientific | 2025 |
| Stick NO Bills Limited | Financial services | 2022 |
| Stoked Vision Ltd | Wholesale & retail | 2016 |
| Stormshore Limited | Professional & scientific | 2023 |
| Stowaway Films Ltd | Information & communication | 2024 |
| Strategy & Operations Limited | Professional & scientific | 2025 |
| Stratum Marquetry Ltd | Manufacturing | 2022 |
| Stravon Advisory Ltd | Professional & scientific | 2026 |
| Stroppy Stuff Ltd | Manufacturing | 2022 |
| Stuart Wilkes Project Management Ltd | Construction | 2019 |
| Studio Somewhere Limited | Information & communication | 2021 |
| Stunning Escapes Limited | Administrative & support | 2025 |
| Subsea Minerals Ltd | Mining & quarrying | 2000 |
| Subsea Sensors Ltd | Professional & scientific | 2025 |
| Sugar Cured Prawn Limited | Hospitality | 2019 |
| Sugartree West Limited | Manufacturing | 2006 |
| Summit Flats Management Company Limited(The) | Households | 1975 |
| Sun Sparks Limited | Other services | 2018 |
| Sunrise Management Company Limited | Households | 1997 |
| Super Yacht Services Falmouth UK Ltd | Transport & logistics | 2021 |
| Surf Performance Systems Ltd | Arts & recreation | 2025 |
| Surveying Kernow Ltd | Construction | 2025 |
| SW Cleaning & Property Management Ltd | Administrative & support | 2024 |
| SW Property Development Ltd | Real estate | 2023 |
| Swagzilla Trends Ltd | Wholesale & retail | 2024 |
| Swan Properties Cornwall Limited | Real estate | 2011 |
| Swan Song Limited | Professional & scientific | 2025 |
| Swanpool Beach Limited | Arts & recreation | 2006 |
| Swanpool Consultancy Limited | Professional & scientific | 2022 |
| Swanpool Court Management Limited | Real estate | 1997 |
| Swanpool Gardens (Management Company) Limited | Households | 1999 |
| Swanpool Paper Ltd | Information & communication | 2023 |
| Swashbuckling Cornwall Ltd | Arts & recreation | 2015 |
| Swift Strides Ltd | Wholesale & retail | 2023 |
| Swingtide Ltd | Health & social care | 2025 |
| Swpsi Limited | Real estate | 2023 |
| Sync Serve Technologies Ltd | Information & communication | 2026 |
| Synergy Care & Education Limited | Administrative & support | 2024 |
| Synergy Carers Limited | Administrative & support | 2022 |
| T & S Mings Limited | Hospitality | 2016 |
| T Wallis Engineering Ltd | Professional & scientific | 2020 |
| T Wallis Holdings Ltd | Financial services | 2023 |
| T&T Kendall Pubs (Cornwall) Limited | Hospitality | 2021 |
| Tabaco Ltd | Construction | 2018 |
| Take a Turn Yachting Limited | Education | 2023 |
| Take Point Training Limited | Professional & scientific | 2018 |
| Tall Trees Land Limited | Real estate | 2026 |
| Tall Trees Limited | Hospitality | 1995 |
| Taller Than Trees Ltd | Education | 2026 |
| Tanow Homes Limited | Financial services | 2025 |
| Tanow Limited | Real estate | 2025 |
| Tarq's ARQ Limited | Health & social care | 2018 |
| Taxlo Consulting Limited | Professional & scientific | 2002 |
| Taylor Money Limited | Financial services | 1997 |
| Tbec Limited | Construction | 2012 |
| TC16 Limited | Hospitality | 2022 |
| TCC Training Holdings Ltd | Education | 2025 |
| Tccth Bidco Limited | Financial services | 2026 |
| Tccth Top Co Limited | Financial services | 2026 |
| TCD & Associates Limited | Health & social care | 2017 |
| Team Morgan Ltd | Hospitality | 2019 |
| Tech Relays Limited | Information & communication | 2024 |
| TECH-M8 Ltd | Education | 2025 |
| Telning Ventures Limited | Health & social care | 2026 |
| Tenchen Cleaning Services Ltd | Administrative & support | 2025 |
| Terrew Management Limited | Professional & scientific | 2001 |
| Tevreden Limited | Administrative & support | 2023 |
| Tewinn Ltd | Manufacturing | 2025 |
| Texspec Limited | Wholesale & retail | 1998 |
| TH & JRB Laity Limited | Agriculture & fishing | 2002 |
| TH Eliot Limited | Real estate | 2025 |
| TH Sith Limited | Real estate | 2026 |
| Thai Dishes Limited | Hospitality | 2021 |
| Thai E SAN Ltd | Hospitality | 2024 |
| Thai Ubon Station Ltd | Hospitality | 2021 |
| Thai Wine Futures Ltd | Hospitality | 2020 |
| Thai Wines Limited | Hospitality | 2020 |
| THE Acid Testers Limited | Information & communication | 2007 |
| THE Admiral Lounge Ltd | Other services | 2025 |
| THE Anchor Quay 1617/9086/8206 Limited | Real estate | 2005 |
| THE Archives Design Group UK Limited | Arts & recreation | 2016 |
| THE Atlantic Seafront Portreath Ltd | Hospitality | 2018 |
| THE Black Cat Falmouth Ltd | Hospitality | 2024 |
| THE Carnivore HUN Ltd | Information & communication | 2026 |
| THE Clubhouse at Pendra Loweth Ltd | Hospitality | 2026 |
| THE Clutch and Gearbox Centre Limited | Wholesale & retail | 2008 |
| THE Corner Shop Falmouth Ltd | Wholesale & retail | 2017 |
| THE Cornish Barista - Penrose Ltd | Hospitality | 2024 |
| THE Cornish Barista Ltd | Hospitality | 2021 |
| THE Cornish Knitter Ltd | Wholesale & retail | 2024 |
| THE Cornwall Soap Company Limited | Extraterritorial | 2016 |
| THE Cottage Gyllyngvase Road Management Company Limited | Hospitality | 2014 |
| THE Creature Feature Show Community Interest Company | Education | 2022 |
| THE Dell Garage Limited | Wholesale & retail | 2016 |
| THE Dialogue Agency Limited | Professional & scientific | 2017 |
| THE DIE Happy Pizza Company Ltd | Hospitality | 2025 |
| THE Dracaena Centre Ltd | Education | 2004 |
| THE Falmouth Brewery Limited | Manufacturing | 2024 |
| THE Falmouth Cringe Ltd | Arts & recreation | 2022 |