| G.W. Machin and SON Limited | Swaffham | 1984 |
| G.W. Read Limited | Woodhall Spa | 2024 |
| G.W. Woolhouse & Sons Limited | Rotherham | 1987 |
| G.W.Crane Limited | Norwich | 1957 |
| G.W.R. Ltd | Shrewsbury | 2005 |
| G.W.Vermin Control Ltd | Caernarfon | 2026 |
| G.Whitfield & SON Limited | Newport | 1963 |
| G.Williams Ffensio CYF | Pwllheli | 2023 |
| G.Woodmansey & SON Limited | Nr Beverley | 1954 |
| G17 Limited | Warwickshire | 2017 |
| G3 Fisheries Ltd | West Horndon | 2017 |
| G4ORCE Tree Company Limited | Manchester | 2015 |
| GA Harrison Ltd | Penrith | 2009 |
| GA Liddle & SON Limited | Selby | 2010 |
| Gable's Limited | Leominster | 2005 |
| Gabriels Farm Ltd | Edenbridge | 2021 |
| Gabris Tree Care Ltd | Lacey Green | 2021 |
| Gaddesby Hall Farm Ltd | Gaddesby | 2024 |
| Gade Valley Farms Limited | Berkhamsted | 1963 |
| Gade Water Nurseries Limited | | 1975 |
| Gadlys Farm Limited | Menai Bridge | 2023 |
| Gaeltone Limited | Isle Of Lewis | 2005 |
| Gaerstone Consulting Ltd | Bury St. Edmunds | 2025 |
| Gaia Earth Ltd | St. Albans | 2020 |
| Gaia Gardens Ltd | London | 2019 |
| Gaia's Escargot Limited | Liskeard | 2024 |
| Gaiatech Industries Ltd | Barnstaple | 2020 |
| Gainsborough Feral Rescue CIC | Gainsborough | 2026 |
| Gair Trawlers Limited | Seaton Sluice | 2004 |
| Gaitway Equestrian Ltd | Aberdeen | 2025 |
| GAL in the Garden Ltd | Rayleigh | 2023 |
| GAL Scallops Ltd | Shetland | 2014 |
| Gala Fish Farming Limited | Selkirkshire | 1988 |
| Galastar Holsteins Limited | Whitefield | 2011 |
| Galaxy Rail Limited | Trowbridge | 2024 |
| Galbraith Forestry Contracting Ltd | Auchterarder | 2018 |
| Galbraith Trawlers Limited | Campbeltown | 2008 |
| Galca-Shell Limited | Oban | 2005 |
| Galdanagh Farms Ltd | Ballymena | 2023 |
| Gale Estates (APL) Ltd | Abingdon | 2013 |
| Gale Estates (Oxfordshire) Ltd | Abingdon | 2017 |
| Gale Estates Limited | Wisbech | 1964 |
| Galexim Limited | Portsmouth | 2017 |
| Galhal Ltd | Johnstone | 2020 |
| Galicore Services Limited | Braintree | 1996 |
| Galilee Fishing Ltd | Fraserburgh | 2021 |
| Galileo Marine and Land Services Limited | Melling | 1995 |
| Galingale Limited | Wimborne | 2020 |
| Gall Farming Company Limited | Angus | 1998 |
| Gall Storage (Auchnagatt) Ltd | Ellon | 2010 |
| Gallabar Farm Limited | Stockton-On-Tees | 1973 |
| Gallagher Bloodstock Limited | Maidstone | 1988 |
| Gallagher Farms Limited | Maidstone | 2010 |
| Gallagher Livestock Ltd | Omagh | 2022 |
| Gallant Maintenance Services Limited | Hemel Hempstead | 2018 |
| Gallard Associates Limited | Skipton | 1986 |
| Galley's Agricultural Poultry & Livestock Ltd | Rotherham | 2021 |
| Gallica Stour Ltd | London | 2025 |
| Gallico Ltd | Ipswich | 2025 |
| Gallimore Bros Limited | Uttoxeter | 2016 |
| Gallini Ltd | London | 2024 |
| Gallipot Field Ltd | London | 2022 |
| Galloon Island Eggs Limited | Enniskillen | 2019 |
| Gallop & Groom Limited | Shefford | 2025 |
| Gallop Flame Ltd | London | 2012 |
| Gallops SW Ltd | Bristol | 2021 |
| Galloway Cattle Society of Great Britain and Ireland (the) | Kirkcudbrightshire | 1915 |
| Galloway Farms Limited | Royston | 2021 |
| Galloway Fisheries Trust | Newton Stewart | 2015 |
| Galloway Game Limited | Dumfries | 2020 |
| Galloway Services Limited | Perth | 2026 |
| Galloway Stud Limited | Waltham Cross | 2021 |
| Galloway Trees Limited | Dumfries | 2006 |
| Gallus Solutions Ltd | Maidenhead | 2013 |
| Galtee More Farming Limited | Marlborough | 2011 |
| Galton's Goodies Ltd | Kings Lynn | 2025 |
| Galtway Farm Limited | Kirkcudbright | 2020 |
| Galwad Y MOR Shellfish Bridlington Limited | Bridlington | 2000 |
| GAM Fishing Lossie Ltd | Elgin | 2020 |
| Gambaboy Properties Limited | Bourne | 2000 |
| Gamblin T & a Services Limited | Fareham | 2003 |
| Gambrill Fishing Limited | Camborne | 2022 |
| Game & Sporting Solutions Limited | Bungay | 2011 |
| Game and Country Sporting Limited | Hereford | 2015 |
| Game and Wildlife Conservation Trading Limited | Hampshire | 1980 |
| Game and Wildlife Scottish Demonstration Farm | South Queensferry | 2014 |
| Game Fish Africa Ltd | Marlborough | 2025 |
| Game Gliders Limited | Bungay | 2026 |
| Game Management Scotland Limited | Keith | 2012 |
| Game Shooting Fife Limited | Strathkinness | 2012 |
| Game Shooting Speyside Ltd | Perth | 2024 |
| Gameagent Services Limited | Weston-Super-Mare | 1993 |
| Gamebore Cartridge Co. Limited | Humberside | 1974 |
| Gamekeepers Goods Ltd | Winchester | 2024 |
| Gamrie Farms Limited | Tayside | 2007 |
| Gamston Wood Farm Limited | Retford | 2012 |
| Gamston Wood Livery Ltd | Rotherham | 2018 |
| Gamvio Ltd | Dagenham | 2022 |
| Ganaway Farms Limited | Belfast | 2012 |
| Gandalf Grain Driers Limited | Marlborough | 1994 |