| T.L.C. Potatoes Ltd. | Banchory | 1993 |
| T.Lea Sherwin Limited | Middlewich | 1961 |
| T.M.P Site Services Ltd | Scunthorpe | 2016 |
| T.O.M Musson Agri Limited | Spalding | 2023 |
| T.O.P. Forestry Ltd | Ystrad Meurig | 2021 |
| T.P. Atkinson Limited | Richmond | 2002 |
| T.P. Gilman Limited | Stamford | 1976 |
| T.P. Morrissey Limited | Worcester | 2001 |
| T.R Services Cheshire Ltd | Macclesfield | 2025 |
| T.R. Harding Limited | Wimborne | 1979 |
| T.R. Holmes (Farms) Limited | Lincoln | 1977 |
| T.S. & L. Petch Ltd | Saltburn-By-The-Sea | 2022 |
| T.S. Inett Limited | Wolverhampton | 1955 |
| T.S.P.F Ltd | Mold | 2025 |
| T.Spink & Sons Limited | Filey | 1946 |
| T.T. Matthews (Farms) Limited | Chelmsford | 1961 |
| T.T.Walker(Newcastle)Limited | Newcastle Upon Tyne | 1952 |
| T.W. & E. Tennant & SON Limited | Newcastleton | 2012 |
| T.W. Haffey & Sons Limited | Craigavon | 1963 |
| T.W. Knapton (Farmers) Limited | Near Scunthorpe | 1983 |
| T.W. Robinson (Farmers) Limited | York | 1959 |
| T.W. Sibley (Farms) Limited | Hove | 1970 |
| T.W.A. & A.S. Cundy Limited | Nottingham | 1981 |
| T.W.Falkingham Limited | Goole | 1959 |
| T.W.Fearnall and SON Limited | Shropshire | 1957 |
| T.W.Gore(Farms)Limited | Swindon | 1958 |
| T.W.H.Clarke and SON(1954)LIMITED | Ely | 1954 |
| T.W.Hayes,Limited | Market Rasen | 1946 |
| T.W.I.G. Woodland Management Ltd. | Aberystwyth | 2016 |
| T.Wequineservices Ltd | Colyton | 2020 |
| T.Whitwell & Sons Limited | Nr Clitheroe | 1959 |
| T4 Forestry Ltd | Tain | 2024 |
| T4 Tree Surgery Limited | Maidstone | 2020 |
| T4M Agritech Ltd | Margate | 2016 |
| TA & PJ Stephenson Limited | York | 2010 |
| Tablehurst Farm Limited | Forest Row | 1996 |
| Tabley Brook Kennels Ltd | Knutsford | 2024 |
| Tabor Farms Limited | Rochford | 1979 |
| Tachbrook Farming Limited | Ross-On-Wye | 2016 |
| Tack Farms Limited | Bromyard | 2003 |
| Tacklebox Mail Order Ltd | Worthing | 2016 |
| Tacky Central Limited | Chesham | 2018 |
| Tacooba Limited | Ilford | 2025 |
| TAD Contracting Limited | Knutsford | 2022 |
| TAD Equestrian Limited | Stockport | 2020 |
| Tadorna Holdings Limited | King'S Lynn | 1975 |
| Taft Wharf Farm Ltd | Wolseley Bridge | 2016 |
| TAG Agri Contracting Ltd | Lincoln | 2021 |
| TAG Consulting Limited | Cambridge | 2004 |
| TAG Contracting Limited | Clanfield | 2025 |
| TAG Forestry Investments Ltd. | Newbury | 2017 |
| TAG Trees Limited | Folkestone | 2010 |
| Tagelsir Trading Ltd | London | 2022 |
| Tagg Farms Ltd | Horncastle | 2014 |
| Tagzvondeni Kennels & Cattery Ltd | East Grinstead | 2017 |
| Tahanan Ltd | Fraserburgh | 2019 |
| Taher Farms UK Limited | London | 2019 |
| Tahuna Farms Ltd | Ellon | 2020 |
| Tailor-Made Partnership Ltd | Liphook | 2025 |
| Tailored Enterprise Ltd | Leicester | 2021 |
| Tailored K9S Ltd | Knutsford | 2026 |
| Tails and Shells Ltd | London | 2014 |
| Tails-A-Waggin Limited | Portsmouth | 2016 |
| Tailwags Dog Walking Ltd | Amersham | 2022 |
| Tair Gafr Wines CYF | Barry | 2022 |
| Takara Ltd | London | 2025 |
| Take a Walk on the Tyneside Ltd | Newcastle Upon Tyne | 2020 |
| Take Root BIO Limited | Darlington | 2022 |
| Take the Lead Dog Services Ltd | Reading | 2023 |
| TAL Y Sarn Farm C.B.C. | Dwyran | 2022 |
| Talabe Ltd | Wrexham | 2025 |
| Talbenny Poultry Limited | Haverfordwest | 2020 |
| Talbot Sport Horses Limited | Alresford | 2019 |
| Talbot Turf Supplies Limited | Derby | 1998 |
| Talfan Farming Limited | Tregaron | 2024 |
| Talfan Farms Ltd | Swansea | 2017 |
| Talha Rice Dealer and Trader Ltd | Cardiff | 2025 |
| Talisman Fishing (Looe) Ltd | Looe | 2005 |
| Talking Dog Training Limited | Liverpool | 2020 |
| Talking Tatties Limited | Selby | 2008 |
| Tall Tree Services Limited | Gloucester | 2024 |
| Tall Trees & Small Woods Arboricultural Services Limited | Carmarthen | 2020 |
| Tall Vale Farms Ltd | Shrewsbury | 2023 |
| Talland Consulting Limited | Maidenhead | 2019 |
| Tallentire Hill Farm Limited | Cockermouth | 2013 |
| Talley Community Amenity Association | Llandeilo | 2002 |
| Talley Sawmill Ltd | Llandeilo | 2016 |
| Tally Oak Limited | Exeter | 2022 |
| Talmine Joiners Ltd. | Tain | 2006 |
| Talu Forestry Services Limited | Burton Upon Trent | 2010 |
| Talvex Limited | Lingfield | 2026 |
| Talwrn Farms Ltd | Wrexham | 2015 |
| Tama U.K. Limited | Alton | 1995 |
| Tamar Agri Limited | Gunnislake | 2018 |
| Tamar Grow Local CIC | Callington | 2007 |
| Tamar Nurseries Limited | Upwell | 1979 |
| Tamar Valley Vineyard Ltd | Yelverton | 2015 |
| Tamara Fishing Limited | Cornwall | 2005 |
| Tamarisk Farm Limited | Dorchester | 2003 |
| Tambowie Farming Ltd | Glasgow | 2015 |