| Toome EEL Fishery (Northern Ireland),Limited | Antrim | 1959 |
| Toots Jackson Limited | Hitchin | 2026 |
| Top 'OTH Carrs Farm Ltd | Rossendale | 2022 |
| Top 2 Tail Dog Spa Limited | Hale | 2017 |
| Top Barn Agricultural Services Ltd | Retford | 2025 |
| Top Barn Produce Limited | Worcester | 2009 |
| Top Branch Tree Care Ltd | Harlow | 2024 |
| Top Branch Tree Services Ltd | Margate | 2024 |
| Top CUT Tree Services Limited | York | 2021 |
| Top Farm Enterprises Ltd | Lincoln | 2022 |
| Top Farms Limited | Broadway | 1959 |
| Top Field Farms Limited | Huntingdon | 2007 |
| Top Fruit Storage Ltd | Kent | 2001 |
| Top Ground Limited | Shrewsbury | 2025 |
| Top Harvest Limited | Doncaster | 2021 |
| Top Kulture Ltd | Oldbury | 2025 |
| Top Notch Tree Care Limited | Purley | 2013 |
| Top PEN Y Parc Farm Ltd | Holywell | 2021 |
| Top Sires Select Limited | Taunton | 2005 |
| Top Stream Pets Limited | Colwyn Bay | 2014 |
| Top Tree CUT Surgery Limited | Cowbridge | 2022 |
| Top Trim Tree Surgery Ltd | Epsom | 2021 |
| Toparia Environmental Ltd | Retford | 2014 |
| Topaz (Eco) Ltd | Derby | 2026 |
| Topcap Mushrooms Ltd | Walsall | 2025 |
| Topclay Limited | Bridgend | 2025 |
| Topcoin Limited | Thorney Peterborough | 1993 |
| Topcrop Farming Limited | Peterborough | 2015 |
| Topguard Boarding Ltd | Horsham | 2024 |
| Tophamfields Ltd | Heywood | 2023 |
| Topline Pest Control Ltd | Doncaster | 2018 |
| Topline Ventures Limited | Alcester | 2021 |
| Topling Ltd | Duns | 2002 |
| Topmerrill Riding School Ltd | Loughborough | 2024 |
| Topney Equine Limited | Newry | 2016 |
| Topnut 2022 Limited | Guildford | 2023 |
| Topp Tree Care Limited | Newton Abbot | 2025 |
| Topping Services Ltd | Hailsham | 2021 |
| Toppot Food Limited | Aldershot | 2015 |
| Tops Plants Limited | Broadway | 2021 |
| Tops Therapy Ltd | Banstead | 2019 |
| Topsail Associates Ltd | Woodbridge | 2008 |
| Topsoil Direct Limited | Selby | 1997 |
| Toptotty Ltd | Glasgow | 2026 |
| Toptrees Limited | Northampton | 2022 |
| TOR View Farm Ltd | Langport | 2018 |
| Torbain Farming Company | Ross-Shire | 1980 |
| Torbay Coast & Countryside Trust | Exeter | 1999 |
| Torbay Fish Limited | Devon | 2006 |
| Torfield Limited | Cranbrook | 2002 |
| Torhousemuir Farming Company Limited | Wigtownshire | 2007 |
| Tormiston Farms | Stromness | 2025 |
| Tormore Estate Ltd | London | 2024 |
| Tornado Pest Control Limited | Doncaster | 2019 |
| Tornagrain Conservation Trust | Edinburgh | 2015 |
| Tornamoine Farm Limited | Buxton | 2024 |
| Torr Farm Ltd | Liskeard | 2013 |
| Torr Fishing Limited | Newtownards | 2023 |
| Torr Obair Limited | London | 2022 |
| Torra Foresty Limited | Edinburgh | 2020 |
| Torramhor Limited | London | 2019 |
| Torrance Farms Limited | Stranraer | 1961 |
| Torre Trout Farms Limited | Watchet | 2014 |
| Torriad Farms Limited | Wrexham | 2020 |
| Torridge Growing Together CIC | Bideford | 2023 |
| Torridon Smolts Limited | Tain | 1986 |
| Torrin Fruit Limited | Broadford | 2009 |
| Torrish Estates Company Limited | Sutherland | 1946 |
| Tors Woodland Management Ltd | London | 2022 |
| Tort Towers Rescue CIC | Wadebridge | 2025 |
| Tortola Electrical Ltd | Inverallochy | 2015 |
| Torton Paws Limited | Kidderminster | 2024 |
| Tortworth Estate Limited | Gloucestershire | 1933 |
| Torwoodlee and Buckholm Estates Company. Limited | Selkirkshire | 1952 |
| Toryglen Pet Services Ltd | Glasgow | 2023 |
| Tosco Ltd. | Doncaster | 2017 |
| Toseg Ltd | Glasgow | 2022 |
| Tostock Animal Parks C.I.C. | Nr Bury St Edmunds | 2017 |
| Total Country Care Limited | Wotton-Under-Edge | 2022 |
| Total Equestrian Services Ltd | Twyford | 2025 |
| Total Equine Care Ltd | Mold | 2023 |
| Total Foot Care Limited | Frome | 2014 |
| Total Foot Protection Limited | Chichester | 1999 |
| Total Ground Solutions (Lincs) Limited | Doncaster | 2026 |
| Total Resource International Ltd | Harleston | 2018 |
| Total Solution Pest Control Services Ltd | London | 2013 |
| Total Solutions-Scotland Ltd | Glasgow | 2021 |
| Total Tree Care & Landscaping Ltd | Ashford | 2020 |
| Total Tree Control Ltd | Liphook | 2020 |
| Total Tree Services (North-West) Limited | Glossop | 2015 |
| Total Tree Services Limited | Leicester | 2010 |
| Total Tree Services SW Ltd | Bristol | 2025 |
| Total Truth Limited | Stanmore | 2015 |
| Total Turfing Limited | West Kilbride | 2002 |
| Totalenergies NBS UK Limited | London | 2023 |
| Totalfarm Limited | Bampton | 1982 |
| Totally Equestrian Limited | Devizes | 2017 |
| Totally Trees Limited | Leicestershire | 2003 |
| Totem Polo Ltd | Midhurst | 2022 |
| Tothill Farmers Limited | Grimsby | 1977 |