| GSR Fruits Limited | Faversham | 2001 |
| GSS Farming Limited | Ely | 2006 |
| GST Cooper Ltd | Hull | 2024 |
| GTB Farming Limited | Carlisle | 2017 |
| GTF Fishing Limited | | 2007 |
| Gtjs Farms Ltd | Wrexham | 2024 |
| Gtka Ltd | Southport | 2018 |
| Gtms Environmental Services Ltd | Rugby | 2020 |
| GTR Contracts Limited | Dumfries | 2006 |
| GTS Engineering Ltd. | | 1998 |
| GTW Forestry Ltd | Crieff | 2026 |
| GU Green Union Ltd | Egham | 2022 |
| Guard Force Services Ltd | Lymington | 2021 |
| Guardian Angel Dogs Ltd | Perth | 2025 |
| Guardian Shield K9 Security Services Ltd | London | 2025 |
| Guardtop Limited | Chatham | 1997 |
| Gubbins Enterprises Limited | Cardiff | 2018 |
| Gubby Eventing Limited | Salisbury | 2014 |
| Gubeon Limited | Newcastle Upon Tyne | 2023 |
| Guiding Light Fishing Company Limited | Lerwick | 2008 |
| Guild Farms Limited | Forfar | 2021 |
| Guildford Dog Training Limited | Hayling Island | 2019 |
| Guiness Farms Limited | Caledon | 2020 |
| Guisborough Angling Club Ltd | Guisborough | 2011 |
| Guiting Manor Farms Limited | Cheltenham | 1956 |
| Gulati Construction and Training Ltd | Tipton | 2024 |
| Gulestan-E-Kibria Limited | Towcester | 2023 |
| Gulf Technologies Systems Ltd. | London | 2022 |
| Gulfcrown Limited | Fraserburgh | 2005 |
| Gulfridge Limited | Banff | 2005 |
| Gulfstream Falcons Dubai Limited | London | 2019 |
| Gulliver's Tree Solutions (G.T.S) Ltd | Northampton | 2017 |
| Gulshan Genetics Ltd | Solihull | 2024 |
| Gumecestre Farm Limited | Huntingdon | 1999 |
| Gumis Rose Ltd | Wisbech | 2021 |
| Gumpa Ltd | West Linton | 2021 |
| Gundenham Farms Limited | Taunton | 1959 |
| Gundogs Devon Ltd | Ivybridge | 2022 |
| Gunfleet Sands Fisheries Fund Limited | Colchester | 2008 |
| Gunmac Timber Services Limited | Ludlow | 2008 |
| Gunn Farm Limited | Fermanagh | 2015 |
| Gunnelgate House Ltd | Louth | 2018 |
| Gunnerside Sporting Limited | London | 1996 |
| Gunpowder & Tweed Ltd | Omagh | 2018 |
| Gurney Farming Ltd | Marlborough | 1996 |
| GUS & Boo's Day Care Ltd | Calne | 2024 |
| GUS Bishop Tree Services Limited | Chesterfield | 2025 |
| Guto Roberts CYF | Caernarfon | 2018 |
| GUY & Metherell Ltd. | Warminster | 2018 |
| GUY & Wright,Limited | Much Hadham | 1927 |
| GUY Bloodstock Limited | Beaminster | 2015 |
| GUY J. Raines & SON Limited | Nr Malton | 1964 |
| GUY Properties (Farming) Limited | Haslemere | 1956 |
| GUY Reed Racing Limited | Leeds | 1956 |
| GUY Savory and SON Limited | Fakenham | 1961 |
| Guy's Cliffe Walled Garden Trust Limited | Warwick | 2012 |
| Guyzance Estate Ltd | Newcastle Upon Tyne | 2024 |
| GVG Forestry Limited | Newmilns | 2011 |
| GVT Ventures Ltd | London | 2021 |
| GW Forest & Peatland (NI) Ltd | Omagh | 2025 |
| GW Langlands Services Limited | Wimborne | 2015 |
| Gwaenynog Farms Limited | Ashbourne | 2011 |
| Gwasanaeth Amaeth G Pierce CYF | Betws-Y-Coed | 2014 |
| Gwasanaethau Coed Nant Conwy Tree Services Limited | Llanrwst | 2014 |
| Gwasanaethau Wennol Services CYF | Anglesey | 2005 |
| Gwasg Gylfinir CBC | Garndolbenmaen | 2026 |
| Gwash Valley Ltd | Stamford | 2021 |
| Gwawrfryn Dachshunds Ltd | Llandysul | 2019 |
| GWB Farming Limited | Haverfordwest | 2018 |
| GWD Wildlife Services Limited | Chippenham | 2023 |
| Gwenfaen Limited | Holyhead | 1998 |
| Gwennel Farm Limited | Penzance | 2021 |
| Gwenyn Developments Ltd | Chepstow | 2014 |
| Gwenyn Gruffydd Ltd | Carmarthen | 2019 |
| Gwenynfa ERW Goed CYF | Arthog | 2026 |
| Gwernol Agri Services Ltd | Tywyn | 2019 |
| Gwernypwll Farm Limited | Newtown | 2024 |
| Gwilym Richards & Co Limited | Monmouthshire | 2006 |
| Gwinear Angling Limited | Newquay | 2015 |
| GWM Farms (Braybrooke) Limited | Market Harborough | 2021 |
| GWR Sustainability Ltd | Bristol | 2024 |
| GWS Poultry Ltd | Strabane | 2014 |
| GWT Farms Limited | Ipswich | 1985 |
| Gwyn P Roberts Dairy CYF | Porthmadog | 2025 |
| Gwynedd Mobile Milling Limited | Talsarnau | 2014 |
| Gwynfe Growers CIC | Llangadog | 2026 |
| Gwynfro Farms Limited | Boncath | 2009 |
| Gwynfryn Farm Holidays Limited | Gwynedd | 1962 |
| Gwynhallow Ltd | Camelford | 2019 |
| Gwynns Nook Dog Care Limited | Liverpool | 2024 |
| Gwynt Ffinnant Ltd | Swansea | 2016 |
| Gwynt Gelli Ltd | Carmarthen | 2012 |
| Gym-Khana Stables Ltd | Woodbridge | 2020 |
| Gyroplant Limited | London | 2020 |
| GZ Perkins & Sons Ltd | London | 2025 |
| H & a Buchan Ltd | Fraserburgh | 2021 |
| H & D C Besley Limited | Taunton | 2012 |
| H & D Custance Limited | Huntingdon | 1976 |
| H & F Moir Farms Limited | Inverurie | 2012 |
| H & H Farming Ltd | Stamford | 2022 |