| Thomas Trawlers Limited | Agriculture & fishing | 2005 |
| Thornes Fruit and VEG (Retail) Ltd | Wholesale & retail | 2001 |
| Tiko Lilly Hairdressing Limited | Other services | 2003 |
| Tillie Street Dental Practice | | 1996 |
| TIM Cottle Limited | Construction | 2003 |
| Tinnecarrig Flats Management Company Limited | Households | 1988 |
| Tinten on Farm Composting Limited | Water & waste | 2006 |
| Tolstone Limited | Extraterritorial | 1989 |
| TOM Mitchell (Cornwall) Limited | Wholesale & retail | 1960 |
| Tommy Jacks Beach Apartments Ltd | Hospitality | 2024 |
| Tonkin Recovery Limited | Wholesale & retail | 2007 |
| Tonkins OPE Management Company Limited | Households | 2006 |
| Tony Barry Limited | Wholesale & retail | 2003 |
| Topcoat Vehicles Limited | Wholesale & retail | 2005 |
| Topic Property Limited | Real estate | 2006 |
| Town Mills Limited | Construction | 2006 |
| Townsend Accommodation Ltd | Real estate | 2006 |
| Traditional Tapestries Limited | Manufacturing | 1999 |
| Trail Bike Hire Limited | Arts & recreation | 2003 |
| Tralin Cleaning Services Limited | Administrative & support | 2006 |
| Transferable Skills Training Ltd | Education | 2011 |
| Travel 4000 Limited | Transport & logistics | 2003 |
| Treasure Chest (Boscastle) Limited | Wholesale & retail | 2003 |
| Trebah Enterprises Limited | Wholesale & retail | 1992 |
| Trebah Garden Trust | Arts & recreation | 1990 |
| Trecarne Quarry Limited | Mining & quarrying | 2004 |
| Tredenham Developments Limited | | 1985 |
| Tree - FIX U.K. (2004) Ltd | Wholesale & retail | 2004 |
| Trekennick Services Limited | Information & communication | 2007 |
| Trevarton Electrical Contractors Limited | Construction | 2003 |
| Trevelgue Court Limited | Households | 1972 |
| Trewartha,Gregory & Doidge Limited | Wholesale & retail | 1935 |
| Treyone Woodcraft Limited | Manufacturing | 1985 |
| Tripcony Estates Ltd | Real estate | 2003 |
| Trixsea Health Ltd | Health & social care | 2021 |
| Trouper Ltd | Information & communication | 2006 |
| Trudgeon Halling Limited | Professional & scientific | 2005 |
| Truro Market Auctioneers Limited | Agriculture & fishing | 1973 |
| Truro School Foundation Limited | Education | 1998 |
| Tyre-Rite Ltd | Wholesale & retail | 2004 |
| V.W. Carpenters Ltd | Construction | 2007 |
| Vale Atlantic Associates AVA Limited | Information & communication | 2003 |
| Variety Insurance & Financial Services Limited | Financial services | 1994 |
| Victoria Tippett Ltd | Other services | 2022 |
| Video Greetings Brochure Limited | Public administration | 2019 |
| Visionplus (Cornwall) Ltd | Wholesale & retail | 1986 |
| W B M Groundworks Limited | Construction | 2005 |
| W G D Rogers & Sons Haulage Limited | Transport & logistics | 2003 |
| W.J. Beswetherick and SON Limited | Other services | 1977 |
| W.M.H. Engineering Limited | Construction | 2007 |
| W.R.Sandow Limited | Agriculture & fishing | 1964 |
| W.Thomas (Construction) Limited | Construction | 1972 |
| Wadebridge Boatyard Ltd. | Manufacturing | 2002 |
| Wadebridge Sand Company Limited | | 1976 |
| Walter Bailey (PAR) Limited | Wholesale & retail | 1924 |
| Wanless PK Limited | Construction | 2003 |
| Wanskerne Limited | Real estate | 1985 |
| Watch House Associates Limited | Professional & scientific | 2006 |
| Watson Smyth Farms Limited | Agriculture & fishing | 2002 |
| Wavey Head Ltd | Extraterritorial | 2014 |
| WCP Solutions Ltd | Real estate | 2007 |
| Webcraft Marine Limited | Manufacturing | 2005 |
| Webfooted Designs Ltd | Information & communication | 2006 |
| Wellbeing Hive Cornwall LLP | | 2019 |
| West Coast UK Limited | Wholesale & retail | 2002 |
| West Cornwall Golf Club Limited | Arts & recreation | 1921 |
| Western Mechanical Handling UK Limited | Manufacturing | 1994 |
| Western OIL Buoy Maintenance Limited | | 1977 |
| Westoral Developments Ltd | Construction | 2021 |
| Westward Building Services Limited | Wholesale & retail | 1964 |
| Westward Instruments Limited | Professional & scientific | 2007 |
| Wheldon King Limited | Administrative & support | 2007 |
| White Blancmange Ltd | Administrative & support | 2009 |
| Whites East Meets West Limited | Wholesale & retail | 2003 |
| Wickplace Limited | | 1985 |
| William T. Mitchell Limited | Real estate | 1985 |
| Willow Construction (South West) Limited | Construction | 2007 |
| Winard Limited | Arts & recreation | 2006 |
| Windmill Windows Limited | Construction | 1998 |
| Winnersvipclub Ltd | Arts & recreation | 2006 |
| Winning Steps South West CIC | Education | 2011 |
| Winpenny Lobb Limited | Professional & scientific | 2007 |
| Wood Park (NO. 2) ST Austell Management Company Ltd | Households | 2007 |
| Woodville Flats (Truro) Limited | Households | 1982 |
| Working Sail Limited | Manufacturing | 2002 |
| Wroe's (Bude) Limited | Wholesale & retail | 1962 |
| Xpress International Limited | Transport & logistics | 2022 |
| Yachtsnet Limited | Arts & recreation | 2000 |
| Yennadon Ltd | Professional & scientific | 2004 |
| Yolo Properties Limited | Real estate | 2019 |
| ZIG ZAG Sound Limited | Extraterritorial | 1982 |
| Zilla Music Limited | Manufacturing | 2014 |
| Zingy Projects Limited | Other services | 2022 |
| Zoom Technology Ltd | Information & communication | 2009 |
| Zuma JAY Limited | Wholesale & retail | 2003 |