| Impact ARB Limited | Huyton | 2019 |
| Impact Bloodstock Limited | Newmarket | 2013 |
| Impact Harvest Low-Gi Foods Ltd | Crawley | 2026 |
| Imperial Boerboels Ltd | Fareham | 2025 |
| Imperial Companies Ltd | Epping | 2025 |
| Imperial Corals Limited | Stoke-On-Trent | 2025 |
| Imperial Galore Limited | Ongar | 2020 |
| Imperial Gundogs Limited | Warrington | 2022 |
| Imperium Infrastructure Ltd | Mountain Ash | 2026 |
| Imperium Stud Ltd | Kidderminster | 2022 |
| Imperium Syndicate Limited | Newmarket | 2020 |
| Impex Deal Ltd | London | 2016 |
| Impulsion Matters Ltd | Windsor | 2018 |
| IMT Farms Ltd | Armagh | 2024 |
| IN a Pickle Farm Sanctuary CIC | Saltburn-By-The-Sea | 2023 |
| IN Abundance Care Ltd | Wolverhampton | 2023 |
| IN and OUT Trees Ltd | Treharris | 2021 |
| IN by 12 Ltd | Banff | 2024 |
| IN Showjumpers Global Limited | Henley-On-Thames | 2018 |
| IN Showjumpers Limited | Oxfordshire | 2010 |
| IN Terra PAX Sparkling (UK) Ltd | London | 2025 |
| IN the Spirit CIC | Ashton-Under-Lyne | 2025 |
| IN Vitro Microplants Ltd | Aboyne | 2025 |
| Inaka Nishikigoi Ltd | Axbridge | 2025 |
| Inari Holdings Limited | Forfar | 2022 |
| Inatthestart Ltd | Cardiff | 2019 |
| Inca Alpaca Limited | Dorchester | 2005 |
| Incatuk Limited | Cambridge | 2017 |
| Ince Estates Limited | London | 2020 |
| Inchmarlo Farms Limited | | 1990 |
| Inchstelly Farms Limited | Edinburgh | 1949 |
| Incledon Limited | Ilfracombe | 1990 |
| Incorporated Exmoor Horn Sheep Breeders'Society, | Tiverton | 1906 |
| Incot Farm Ltd | Uttoxeter | 2024 |
| Incredible Edible Carmarthenshire CIC | Llanelli | 2020 |
| Incredible Edible Wrecsam Limited | Wrexham | 2024 |
| Incredible Eggs North Ltd | Crook | 2021 |
| Incredible Eggs Scot Ltd | Crook | 2022 |
| Incrops Ltd | Colchester | 2024 |
| Independent Agriculture Limited | Cheltenham | 1992 |
| Independent Cattle Breeding Services Limited | Laurencekirk | 2014 |
| Independent Technical Advice Limited | Evesham | 2006 |
| Indescribable Growth Ltd | Bridgwater | 2024 |
| Indiabulls Ltd | Luton | 2019 |
| Indica Forestry Ltd | Ashford | 2019 |
| Indico Capital Development & Ventures Ltd | Walton On Thames | 2026 |
| Indigo (Eco) Ltd | Derby | 2021 |
| Indigro Limited | Peterborough | 2011 |
| Indio Bravo UK Ltd | London | 2026 |
| Indiwoods Limited | Armagh | 2007 |
| Indoor Garden Products Limited | Cudham | 1962 |
| Indus Agro Farms Limited | Manchester | 2021 |
| Industrial Engineering Supplies Ltd | Ford Arundel | 2002 |
| Industries by J Ltd | Brighton | 2024 |
| Induvia Limited | Chippenham | 2020 |
| Inecto Farming Limited | London | 2017 |
| Infarm Technologies Limited | Cardiff | 2023 |
| Inferry Forestry Limited | Dunfermline | 2024 |
| Infield Innovation Limited | Oakham | 2023 |
| Infinet Breeding Limited | Haydon Bridge | 2014 |
| Infinite Axis Ltd | Edinburgh | 2023 |
| Infinity Agricultural Ltd | London | 2023 |
| Infinity Alpacas Ltd | Lutterworth | 2021 |
| Infinity Christmas Trees Ltd | Bishops Frome | 2017 |
| Infinity Fishing Company Limited | Peterhead | 2025 |
| Infragravity Ltd | Driffield | 2019 |
| Infusion Estates Group Limited | Preston | 2012 |
| Ingerthorpe Dairy Limited | Harrogate | 2025 |
| Ingham Fisheries Limited | Lympstone | 2024 |
| Ingham's Nurseries Limited | Newbury | 2022 |
| Ingle's Dawndew Salad Limited | Poulton-Le-Fylde | 1949 |
| Ingleborough Farms Limited | Boston | 2014 |
| Inglenook Farm Ltd | St. Helens | 2020 |
| Inglewood Farms Limited | Penrith | 1973 |
| Inglis Farming Limited | Driffield | 2017 |
| Ings Farm Eggs Limited | Skegness | 2008 |
| Inicio-Fresco Limited | Aberdeen | 2013 |
| Inish Tree Services Ltd. | Derry | 2017 |
| Inishconnail Farm Limited | Strabane | 2025 |
| Inishmore Venison Limited | Enniskillen | 2019 |
| Inkerman Lodge Farm Limited | Leicester | 2019 |
| Inkydinky Equine’S Ltd | Rotherham | 2025 |
| Inline K9 UK II Dog Training Limited | Berkshire | 2021 |
| Inman Farming (Barthorpe) Limited | Malton | 2021 |
| Innate Equine Ltd | Christchurch | 2015 |
| Innes Farms (Scotland) Limited | Huntly | 2003 |
| Innes Farms Limited | Huntly | 2012 |
| Innes Trading Company Limited (the) | Elgin | 1947 |
| Innov Diag UK Ltd | London | 2023 |
| Innovate Agri Limited | Driffield | 2019 |
| Innovation Agritech Group Limited | Bracknell | 2017 |
| Innovation Aquatics Ltd | Southampton | 2015 |
| Innovative Development London Limited | Battle | 2016 |
| Innovative Processing Applications Ltd | Horsham, | 2022 |
| Innovative Resources Limited | Gravesend | 2002 |
| Innovative Solutions for Decision Agriculture Ltd | Gerrards Cross | 2018 |
| Innovator Fisheries Limited | Brixham | 2017 |
| Innovis Breeding Sheep Limited | Aberystwyth | 2005 |
| Innovis Limited | Aberystwyth | 2003 |
| Inovaland Investment Limited | London | 2021 |