| Totnes Community Herbal C.I.C. | Totnes | 2022 |
| Totoia Limited | Warwick | 2025 |
| Tottingworth Farms Limited | Heathfield | 1964 |
| Touchwood Tree Surgery Limited | Liverpool | 2018 |
| Tout LE Monde Ltd | South Brent | 2020 |
| Tove Valley Farming Ltd | Potterspury | 2013 |
| Tovey Farming Limited | Dymock | 2008 |
| Tovey Services Limited | Newport | 2011 |
| Toward Tree Consultancy Ltd | Preston | 2024 |
| Tower Equestrian Ltd | Dover | 2022 |
| Tower Farms Barns Holme Limited | Huntingdon | 2020 |
| Tower Farms Limited | Edinburgh | 1960 |
| Tower House Farm Ltd | Carnforth | 2008 |
| Tower Nursery Limited | Milton Keynes | 2013 |
| Towers Poultry Limited | Preston | 2025 |
| Towhill Farm Limited | Exeter | 2005 |
| Towie Bulls Ltd | Little Clacton | 2022 |
| Town & Country Land Management Limited | Watford | 2004 |
| Town & Country Ponds Ltd | Henfield | 2010 |
| Town and Country Trees Limited | Witney | 2001 |
| Town Farm (Wall) Limited | Hexham | 1997 |
| Town Farm Limited | Hatfield Broad Oak | 2011 |
| Town Head Farm Products Limited | Skipton | 2003 |
| Townend Equestrian Centre Limited | Penrith | 2017 |
| Townfoot | Carlisle | 2007 |
| Townhead (Mcdowall) Limited | Aberdeen | 1992 |
| Townhead Farm Helensburgh Ltd | Helensburgh | 2024 |
| Townhead of Hairshaw Farm Ltd | Kilmarnock | 2026 |
| Towns and Carnie Limited | Turriff | 1982 |
| Towns Green Farm Ltd | Colchester | 2018 |
| Townsend Agriculture Limited | Axbridge | 2010 |
| Townsend Farm & Fisheries Ltd | Shrewsbury | 2026 |
| Townsend Farming & Contracting Ltd | Calne | 2022 |
| Townsend Farming Limited | Banbury | 2005 |
| Townsend Shellfish Ltd | Scarborough | 2022 |
| Townsend Tree Service Limited | Baughurst | 2012 |
| Townshend Farms Limited | Bury St Edmunds | 2011 |
| Townson Bros. (Farms) Limited | Clitheroe | 1977 |
| Towse Brothers Limited | York | 1970 |
| Towse Contracts Ltd | York | 2021 |
| Towthorpe Farming Ltd | Driffield | 2021 |
| Towy Gates Ltd | London | 2025 |
| Towyn Development Co. Limited | Powys | 1960 |
| Toxp Ltd | Kettering | 2025 |
| Toynton Herbs Ltd | Spilsby | 2024 |
| TP Agriculture Limited | Caernarfon | 2023 |
| TP Chipper Limited | Ipswich | 2026 |
| TP Farms Limited | Faversham | 2011 |
| TPR Global Limited | Pulford | 2020 |
| Tptcm Global Limited | Carshalton | 2025 |
| TPW Uglow Ltd | Launceston | 2021 |
| TR & L Cooper Ltd | Warrington | 2007 |
| TR & SR Cuff Limited | Sherborne | 2013 |
| TRA Tree Works Limited | Hayes | 2023 |
| Trabroun Contracting Ltd | Duns | 2019 |
| Trace Element Services Limited | Carmarthen | 1982 |
| Trace-Sea Limited | Bridport | 2017 |
| Track Right Livery Ltd | London | 2026 |
| Tracstar Ltd | Walsall | 2025 |
| Tracy Hunt Equestrian Ltd | Brentwood | 2013 |
| Trade Only Plant Sales Limited | Willersey | 1997 |
| Trade Solutions Farms Limited | Perth | 2023 |
| Trademaker Limited | Barnet | 1997 |
| Trademark Forestry Ltd | Appleby-In-Westmorland | 2018 |
| Trademark Trees Ltd | Saltash | 2012 |
| Tradezone Windows Ltd | London | 2005 |
| Traditional Garden Growers Ltd | Witney | 2022 |
| Traditional Livestock Foundation Limited | Kenilworth | 2010 |
| Traditional Norfolk Poultry Limited | Attleborough | 2000 |
| Trafalgar Estate Limited | Bristol | 1993 |
| Trafalgar Farming Limited | Newmarket | 2016 |
| Trafelyrych Limited | Carmarthen | 2004 |
| Trafford Horticulture Ltd | Manchester | 2013 |
| Traherne Farms Limited | | 1997 |
| Traigh Mhor Oysters Limited | Glasgow | 2013 |
| Trail Bear Ltd | Oxfordshire | 2025 |
| Trailblazers U.K. Farming Limited | Taunton | 2000 |
| Trailgrazers (Hertfordshire) Limited | Hertford | 2026 |
| Trails of the Vale Ltd | Barry | 2026 |
| Trainers House Enterprises Limited | Scarborough | 1997 |
| Training Academy @ Dogtastic Ltd | Coalville | 2023 |
| Trakrite Services UK Ltd | Axminster | 2018 |
| Tramway Woodlands Limited | Preston | 2018 |
| Tran Gardening Centre Ltd | Walsall | 2019 |
| Trannon Valley Ltd | Newtown | 2014 |
| Trannon Valley Poultry Ltd | Carmarthen | 2022 |
| Tranquility Fishing Company Limited | Lerwick | 2008 |
| Transatlantic Hippo Heritage Limited | London | 2025 |
| Transform Arboriculture Limited | Liphook | 2025 |
| Transformac Limited | London | 2021 |
| Transforming and Greening the Sahel Ltd | Brierley Hill | 2026 |
| Transis Limited | Angus | 1987 |
| Transition Edinburgh South (Scotland) Ltd | Edinburgh | 2021 |
| Transition North Ronaldsay CIC | Dunkeld | 2020 |
| Transition Town Dorchester CIC | Dorchester | 2014 |
| Transition Turriefield C.I.C. | Sandness | 2011 |
| Transitional Energies Limited | Bristol | 2016 |
| Transnational Trading Corporation Ltd | Surrey | 2018 |
| Transparent Manufacturing Ltd | Wakefield | 2016 |
| Transport Services NW Ltd | Wigan | 2024 |