| Thermopatch UK Ltd | Manufacturing | 1995 |
| Third Formation Limited | Manufacturing | 1990 |
| Thirsk & District Business Association | Other services | 2005 |
| Thirsk Hall Properties Limited | Real estate | 2003 |
| Thomas Fattorini (Properties) Limited | Real estate | 2003 |
| Thompsons of Helmsley Limited | Agriculture & fishing | 2003 |
| Thorp Perrow Arboretum Limited | Arts & recreation | 1997 |
| Thorpefield Partnership Limited | Professional & scientific | 2005 |
| TIM Forman Consulting Ltd. | Professional & scientific | 2005 |
| TIM Ruff Limited | Wholesale & retail | 1999 |
| Timicos Limited | Households | 1984 |
| Tknowit Limited | Information & communication | 2003 |
| TLS Bell TM Ltd | Construction | 2025 |
| Toasttab UK Limited | Financial services | 2022 |
| TOM Willoughby Limited | Construction | 1961 |
| Tony Bartholomew Photography Limited | Professional & scientific | 2002 |
| Toucan Marketing Limited | Professional & scientific | 2016 |
| Townsend Harrison Limited | Professional & scientific | 2002 |
| Tr&S Venture Ltd | Wholesale & retail | 2026 |
| Trade Credit Solutions Ltd | Financial services | 2003 |
| Trafalgar Flats Limited | Households | 1984 |
| Trenholme Limited | Agriculture & fishing | 2023 |
| Trident Marketing Solutions Limited | Information & communication | 2005 |
| Tullyvallen Equine Services Ltd | Agriculture & fishing | 2022 |
| Tweedshot GUN Dogs Limited | Wholesale & retail | 2002 |
| Tyke Financial Software Limited | Information & communication | 2007 |
| Tyler Morgan Claims Limited | Financial services | 2008 |
| Unique Trading Company Group Ltd | Wholesale & retail | 2026 |
| United Brothers Group Ltd | Construction | 2026 |
| United Engine Export Limited | Real estate | 1981 |
| United Service International Company Ltd | Information & communication | 2024 |
| Unity International Holdings Global Ltd | Wholesale & retail | 2026 |
| Valebridge Trade Limited | Wholesale & retail | 2026 |
| Valhalla (York) Ltd | Hospitality | 2016 |
| VAR Media Ltd | Wholesale & retail | 2026 |
| Vbs-Gmark Limited | Information & communication | 1999 |
| Vendparts Ltd. | Wholesale & retail | 2003 |
| Vermex Limited | Administrative & support | 2000 |
| Vertex International Group Ltd | Wholesale & retail | 2026 |
| Victoria Fold Sabden Management Company Limited | Real estate | 2019 |
| Viesage Limited | Administrative & support | 2005 |
| Viewspan Property Management Limited | Households | 1990 |
| Vinton Engineering Services Ltd. | Professional & scientific | 2000 |
| Viresco (UK) Limited | Wholesale & retail | 2004 |
| Vision Matrix Limited | Manufacturing | 1996 |
| Vismo Limited | Information & communication | 2001 |
| W M J Developments Limited | Real estate | 2001 |
| W. Fletcher & Sons Ltd | Wholesale & retail | 2002 |
| W. Lawrence and SON Limited | Construction | 2002 |
| W.B. Ritchie Farms Limited | Agriculture & fishing | 1997 |
| Waingates Limited | Real estate | 2003 |
| Walker & Hutton (Scarborough) Limited | Construction | 1963 |
| Walker & Scott | Extraterritorial | 1936 |
| Walker Nicholas Architects Ltd | Professional & scientific | 2009 |
| Walkers Garage Limited | Wholesale & retail | 2004 |
| Walter Pickering Limited | Wholesale & retail | 1936 |
| Walter Thompson (Contractors) Limited | Construction | 1946 |
| Waterloo Place Management Limited | Households | 2003 |
| WCG Properties Limited | Real estate | 2007 |
| Websters (Burn) Glass Limited | Construction | 2008 |
| Welham Park Trout Farms Limited | Agriculture & fishing | 1984 |
| West Bank Flat Management Co Ltd | Hospitality | 1982 |
| West Hartlepool Steam Navigation Company Limited(The) | Administrative & support | 1899 |
| West Tanfield Garage Limited | Wholesale & retail | 2002 |
| Westcliffe Developments (Whitby) Ltd | Construction | 2007 |
| Wetherells Contracts Limited | Manufacturing | 1922 |
| Wharfebank | Extraterritorial | 1944 |
| Whitby and Pickering Railway Limited | Transport & logistics | 2005 |
| Whitby Grosvenor Management Company Limited | Households | 1979 |
| White Rose Finance Company Limited | Financial services | 1955 |
| Whitegates Nursery Limited | Agriculture & fishing | 2003 |
| Whitelock (Invest) Limited | Financial services | 2023 |
| Whitelock Greens Limited | Administrative & support | 2017 |
| Whitelock Quarry Limited | Administrative & support | 2017 |
| Whsn Hotels Limited | Hospitality | 1998 |
| William Bell & Partners Limited | Construction | 1961 |
| Williams Investment Management LLP | | 2004 |
| Willowdene Watercress & Trout Farm Ltd | Agriculture & fishing | 2005 |
| Wills Golf Limited | Arts & recreation | 2007 |
| Wilson Roofing Limited | Construction | 2006 |
| Winbrian Properties Limited | Real estate | 1978 |
| WM. Potter & Sons (Rainton) | Agriculture & fishing | 1961 |
| Woodard Lettings (Yorkshire Schools) Limited | Education | 1983 |
| Woodhead and Bray Limited | Real estate | 1959 |
| Woods of Harrogate Limited | Wholesale & retail | 1962 |
| Wootten Dean Limited | Professional & scientific | 2006 |
| Wrens Contracting Limited | Agriculture & fishing | 2002 |
| Wright's Seadale Caravan Camp Limited | Hospitality | 1961 |
| Wynbrook Court (Scalby) Limited | Households | 1964 |
| XFR Limited | Information & communication | 2005 |
| Yasser Zaghloul & Partners for Wholesale and Retail Ltd | Manufacturing | 2026 |
| Yazmaan Ltd | Arts & recreation | 2003 |
| Yeoman Estates Limited | Construction | 1998 |
| YOR Local Medical Committee Limited | Administrative & support | 2007 |
| York & District Investment Company Limited | Real estate | 1959 |
| York Archaeological Trust for Excavation and Research Limited | Professional & scientific | 1979 |
| York Associates International Limited | Education | 2003 |
| York Glaziers' Trust (the) | Construction | 1967 |
| York House (Richmond) Limited | Wholesale & retail | 1987 |
| York House Services Limited | Professional & scientific | 2004 |