| Hyperhype Limited | London | 2025 |
| Hyperion Estates Limited | Billericay | 1998 |
| Hyperion Thoroughbreds Ltd | Buckingham | 2021 |
| Hyphae Mushrooms CIC | Glogue | 2026 |
| Hyslop Brothers Limited | Girvan | 2006 |
| Hyton Poultry Limited | Oswestry | 1967 |
| I & a Bait Limited | Cheshire | 2005 |
| I & G Gibson Limited | North Yorkshire | 2002 |
| I & HL Williams CYF | Abergele | 2010 |
| I & J Bushell Limited | Ashford | 2006 |
| I & J M Pass & Sons Ltd | Dyfed | 2003 |
| I & M Poultry Farm (Midland) Limited | Telford | 2022 |
| I & P Ellithorn Limited | Penrith | 2012 |
| I & W Wilson Limited | | 2007 |
| I AM Aqua Ltd | Glasgow | 2019 |
| I AM Lumberjack Ltd | Fawkham | 2017 |
| I B a Fishing Ltd | Bixter | 2012 |
| I C Green & SON Limited | Knaresborough | 1998 |
| I Donaldson & Co Limited | Orkney | 2004 |
| I E Forestry Contractors Ltd | Dolwyddelan | 2025 |
| I Evans Tree Services Limited | Holywell | 2015 |
| I Fruit Ltd | Maidstone | 2013 |
| I Guler Ltd. | Peterhead | 2014 |
| I H Forestry Limited | Newcastle Upon Tyne | 2014 |
| I J & a E Henderson Limited | Carlisle | 2006 |
| I J J Services Limited | Grimsby | 2023 |
| I J M Yates Farming Limited | Marlborough | 2017 |
| I Leadbetter Ltd | Auchterarder | 2013 |
| I Leslie Engineering Ltd | Quendale | 2025 |
| I Love Halil Ltd | London | 2019 |
| I P & C J Pickford Limited | Sturminster Newton | 2008 |
| I P Crane Limited | Guisborough | 2023 |
| I P Poultry Ltd | Omagh | 2017 |
| I R & H E Davey Ltd | Saltash | 2015 |
| I S Farrell Limited | Co Tyrone | 2002 |
| I S J Farming Limited | Derby | 2006 |
| I S Johnson Ltd | Isle Of South Uist | 2012 |
| I T Allison Limited | Stratford-Upon-Avon | 2011 |
| I T Dennis Limited | Skegness | 2003 |
| I W Preece Limited | Pembroke | 2017 |
| I&P Buchanan Limited | Dungiven | 2018 |
| I&T Mckelvey Ltd | Hillsborough | 2025 |
| I. Clark Agricultural Services Limited | Rutland | 2023 |
| I. G Grindal & Sons Limited | Grantham | 1960 |
| I. M. Hodgson & SON (PIG Enterprises) Limited | Patrington | 1967 |
| I.& J.Holmes & Co.Limited | Cheltenham | 1964 |
| I.D. Stubbs Farming Limited | Lichfield | 2010 |
| I.F. Limited | Manchester | 1987 |
| I.G. & P.R. Stephens (Farmers) Limited | Bude | 1983 |
| I.M. Mitchell Farming Limited | Wellington | 2012 |
| I.M.Equestrian Holdings Ltd | Leicester | 2024 |
| I.M.Hodgson & SON Limited | Patrington | 1955 |
| I.R. Limited | Aberdeen | 2003 |
| I.S.O Baits Ltd | Swindon | 2025 |
| I.W. Renner & Sons | Oakham | 1987 |
| Iacomus Fishing Company Limited | Fraserburgh | 2020 |
| Iain Greig Ltd. | Aberdeenshire | 2003 |
| Iain Kyle Limited | Carlisle | 2002 |
| Iain Macleod Fishing Ltd | Ullapool | 2022 |
| Iain Mclean Limited | Banff | 2003 |
| Iain Nixon Farriery Limited | Bury St. Edmunds | 2021 |
| Iain Service & Company Limited | | 2002 |
| Iain Tweedie Ltd. | Ayrshire | 2004 |
| Iama Herbs Ltd | Loughborough | 2020 |
| IAN a Patience Limited | Dornoch | 2003 |
| IAN Allston Tree Surgery Limited | Colchester | 2010 |
| IAN Childe (Agricultural Services) Limited | Shropshire | 2003 |
| IAN Cruickshank (Potatoes) Limited | Inverurie | 1984 |
| IAN Dyer Contract Services Ltd | Leics | 2007 |
| IAN Earl Ltd | Ashby-De-La-Zouch | 2004 |
| IAN Ford Limited | Whitby | 2003 |
| IAN G Donald (Potatoes) Ltd | Banff | 2007 |
| IAN Gatt Ltd. | Fraserburgh | 2003 |
| IAN Harrison Fencing & Contracting Limited | Carlisle | 2008 |
| IAN Hogg Farms Ltd | Doune | 2024 |
| IAN Hope (Farms) Limited | Perthshire | 1961 |
| IAN Jamieson Farming Partnership Limited | Dundee | 2024 |
| IAN Johnston & Sons Limited | | 1960 |
| IAN Kemsley Farms Limited | Sittingbourne | 1988 |
| IAN Mason Farms Limited | Hunstanton | 1995 |
| IAN Millward Forestry Limited | Reigate | 1995 |
| IAN Mosey (Livestock) Limited | York | 2009 |
| IAN Mosey Limited | York | 1979 |
| IAN P Laird Unlimited | Lincoln | 2004 |
| IAN PAY Trading Limited | Bridgwater | 2003 |
| IAN Potts & Sons Limited | Northumberland | 2005 |
| IAN Price Farms Limited | Loughborough | 2020 |
| IAN R Mackie Ltd. | Peterhead | 2003 |
| IAN Ritchie (Fishing) Limited | Fraserburgh | 2006 |
| IAN Robinson Bloodstock Limited | Grimsby | 2002 |
| IAN S. Ferguson & Sons Limited | Mundon | 1980 |
| IAN Simpson Agriculture Limited | Dunblane | 2004 |
| IAN Smith Livestock Services Limited | Barrow | 2000 |
| IAN Snape Agriculture Limited | Redditch | 2015 |
| IAN Stamp Ltd | Woodhall Spa | 2003 |
| IAN Strang Limited | Hastings | 2012 |
| IAN Trueman Specialist Tree Services Limited | Chesterfield | 2006 |
| IAN Ward Services Ltd | Grimsby | 2021 |
| IAN Wharton Limited | Wigton | 2002 |
| IAN White Limited | Perth | 1982 |