| Grampian Contracts Solutions Limited | Aberdeen | 2017 |
| Gran Aggregates Limited | Spalding | 2025 |
| Gran Tierra UK Limited | Reading | 2017 |
| Grand 22 Limited | Littlehampton | 2010 |
| Grange Farm Minerals Limited | Scarborough | 2012 |
| Grange Quarry Limited | Lockerbie | 2000 |
| Granita Consulting Ltd | London | 2026 |
| Granite Corporate Alliance Limited | Cardiff | 2008 |
| Grant's Welding Services Limited | Edinburgh | 2007 |
| Granta OIL & GAS Limited | Liphook | 2008 |
| Grantec Limited | Keith | 2013 |
| Graphite Earth Limited | Manchester | 2021 |
| Grasshopper Services (2009) Limited | Colchester | 2009 |
| Gravity Mining Limited | Cheltenham | 2014 |
| Gray (Energy) Matters Ltd | Aberdeen | 2023 |
| Grayt Energy Services Ltd | London | 2015 |
| GRB Subsea Ltd | Westhill | 2016 |
| Great Britannia Ltd | London | 2015 |
| Great Hope Mining Syndicate Ltd | Southampton | 2025 |
| Great Southern Copper PLC | London | 2020 |
| Greatland Gold Limited | London | 2005 |
| Grecian Marbles (Marmor) Limited | Barnet | 1911 |
| Greece Pantori Co., Ltd | Cambridge | 2026 |
| Green ASH Renewables Ltd | York | 2023 |
| Green BOW Maritime Limited | Southampton | 2014 |
| Green Circle Aggregates Limited | South Glamorgan | 2004 |
| Green Energy Metals Ltd | Northwood | 2024 |
| Green Energy UK Services Ltd | London | 2022 |
| Green Glen Minerals Limited | High Wycombe | 2020 |
| Green Land PD Limited | Hope Valley | 2012 |
| Green MAN Geoprojects Ltd | Bedford | 2016 |
| Green Minerals Africa Limited | London | 2021 |
| Green Minerals Zambia Limited | London | 2021 |
| Green Mining Africa Limited | London | 2021 |
| Green Mining Zambia Limited | London | 2021 |
| Green OIL and GAS Limited | London | 2010 |
| Green Peridot Limited | London | 2018 |
| Green View Partners Limited | London | 2020 |
| Green Well Engineering Services Ltd | Montrose | 2007 |
| Greencrest Solutions Limited | Buckinghamshire | 1999 |
| Greenhills Enterprises Ltd | Pomeroy | 2018 |
| Greenlands Fertilizer Ltd | Smethwick | 2022 |
| Greenore Gold Holdings Limited | London | 2015 |
| Greenore Gold PLC | London | 2011 |
| Greenore Group Ltd | London | 2024 |
| Greenroc Graphite Limited | London | 2012 |
| Greens Natural Stone Products Limited | Burnley | 2007 |
| Greenstone Energy Ltd | Brighton | 2026 |
| Greenstone Management Services Holdings Limited | London | 2012 |
| Gregory Donnelly Sand & Gravel Limited | Co Derry | 2001 |
| Gresham Gravel Limited | Holt | 2012 |
| Grey Eagle Access Ltd | Bellshill | 2025 |
| Greymist Ltd | Glasgow | 2022 |
| Grid Surveys Europe Ltd | Golspie | 2016 |
| Griffin Mining (UK Services) Limited | London | 2004 |
| Griffin Petroleum Consulting Limited | Didcot | 1998 |
| Grimebridge Colliery Company Limited | Bacup | 1996 |
| Grinshill Stone Quarries Limited | Shrewsbury | 1998 |
| Grisio Crop Stress Resistance Laboratory Co., Limited | Manchester | 2025 |
| Grivest Ltd | London | 2025 |
| Grizzly Quarry Services Ltd | Buxton | 2016 |
| Grmv Consulting Ltd | Shrewsbury | 2018 |
| Groby Contractors Limited | Leicester | 2012 |
| Grogan Quarries Ltd | Sixmilecross | 2002 |
| Grosvenor Energy Limited | Esher | 2019 |
| Ground UP Engineering Limited | Oxford | 2011 |
| Groundwater Engineering Limited | Wakefield | 2013 |
| Group M Holding Ltd | London | 2021 |
| Grove Drilling Limited | Lowestoft | 2024 |
| Grovelink Associates Limited | Broseley | 2001 |
| Growmax(Gmc) Ltd | London | 2021 |
| GRP 234 Limited | Oldham | 2012 |
| GRS (Roadstone) Limited | Nuneaton | 1996 |
| GRS Bagging Holdings Limited | Nuneaton | 2004 |
| GRS Earth Solutions Limited | Nuneaton | 1968 |
| GRS Integrated Solutions Limited | Nuneaton | 2000 |
| GRS Production & Logistics Holdings Limited | Nuneaton | 2006 |
| GRS Roadstone Group Limited | Nuneaton | 2014 |
| GRS Roadstone Holdings Limited | Nuneaton | 2004 |
| Grundon Sand & Gravel Limited | Wallingford | 1947 |
| Grundon Waste Food Products Limited | Harefield | 1956 |
| Grvx Ltd | London | 2025 |
| Gryphonn Quarries Limited | Hengoed | 1986 |
| GS Inspection Services Ltd | Dundee | 2016 |
| GSG Consultant Services Ltd | Shepperton | 2015 |
| GSL Mechanical Ltd | Buckie | 2020 |
| GSM Access Ltd | Alness | 2020 |
| GSN Mining UK Limited | London | 2016 |
| GT Mining Ltd | Cardiff | 2020 |
| GT Quarries Ltd | Derry | 2020 |
| GT Tmgl Limited | Edinburgh | 1934 |
| GT4 Consulting Limited | Cardiff | 2026 |
| GTA Fpso Company Ltd | Middlesex | 2021 |
| GTL Terminals Limited | London | 2006 |
| Guangdong Fusha Import and Export Trading Limited | London | 2025 |
| Guarani Sustainable Energy PLC | London | 2009 |
| Guardian Africa Limited | London | 2021 |
| Guardian Mining Limited | London | 2021 |
| Guards Quarry Limited | Windermere | 2022 |
| Guiting Quarry Limited | Chipping Norton | 2019 |