| Global Lifelines Energy Limited | Manchester | 2023 |
| Global Lithium Ltd | Cardiff | 2021 |
| Global Mineral Corporation Ltd | London | 2024 |
| Global Mining Development Limited | London | 2011 |
| Global Mining Synergies Ltd | London | 2024 |
| Global Offshore Solutions Ltd | Liverpool | 2021 |
| Global OIL Services Limited | Lincolnshire | 2001 |
| Global Oilfield Supplies Limited | Downham Market | 2003 |
| Global Petroleum Exploration Ltd | London | 2005 |
| Global Piping Solutions Ltd | Lewes | 2018 |
| Global Plant Hire Limited | Glasgow | 2019 |
| Global Prospecting Limited | Lichfield | 2010 |
| Global Renewable Services Ltd | Poringland | 2018 |
| Global Safety Systems Ltd. | Kirkcaldy | 2011 |
| Global Scitech-Innovations Ltd | Cardiff | 2016 |
| Global Staff Solutions Intl Ltd | London | 2018 |
| Global Techno Limited | Watford | 2025 |
| Globalstream OIL Resources Ltd | London | 2023 |
| Globaltech Energy Solutions Ltd | Newcastle Upon Tyne | 2025 |
| Globcommerce Ltd | London | 2025 |
| Globe Metals & Mining UK Ltd | Brentford | 2018 |
| Globequip Ltd | London | 2025 |
| Glopro Energy Services UK Limited | Ipswich | 2017 |
| Glory International Resources Ltd | York | 2011 |
| Glory Petroleum UK Limited | York | 2019 |
| Glycan Finance Corporation Ltd | London | 2008 |
| Glycan Nutrition Ltd | London | 2008 |
| Glycan Space XR Ltd | London | 2008 |
| GM Safety Limited | Hamilton | 2017 |
| GM Technical Inspection Ltd | Westhill | 2012 |
| Gman Offshore Solutions Ltd | Runcorn | 2014 |
| GMB Geological Limited | Peterlee | 2021 |
| GMC Mining Company Limited | Harrow | 2026 |
| GMC Mining Services Limited | Harrow | 2026 |
| GMD for Import and Export Ltd | North Yorkshire | 2026 |
| Gmec OIL and GAS Limited | Hounslow | 2016 |
| GML Global Limited | Mitcham | 2024 |
| Gmow (Operations) Limited | Dolgellau | 2010 |
| GMS Resources Limited | London | 2017 |
| GMT Well Services Ltd | Montrose | 2007 |
| GMW Engineering Services Limited | Buckie | 2016 |
| GMY Consultancy Limited | Great Yarmouth | 2013 |
| GNG Inspection Services Limited | Lanark | 2024 |
| GNL Offshore Services Ltd | London | 2008 |
| GO2 Assessment and Training Limited | Runcorn | 2019 |
| GO2023 Realisations Ltd | Warrington | 2015 |
| Godolphin Exploration Limited | London | 2021 |
| Godolphin Mining (UK) Limited | Amersham | 2014 |
| Godpower & Sons Limited | London | 2014 |
| Gofer Mining PLC | Cardiff | 2019 |
| Gogs More Ltd | Elgin | 2023 |
| Golar-Nor (UK) Limited | Bristol | 1996 |
| Gold Bar International Ltd | Preston | 2018 |
| Gold Direct 4U Ltd | Oldbury | 2023 |
| Gold Fields of Mazowe (UK) Limited | London | 2017 |
| Gold Globe Traders Limited | Brighton | 2025 |
| Gold Mining PLC | London | 2026 |
| Gold RIG Ltd | Glasgow | 2025 |
| Gold Rush International Ltd | London | 2025 |
| Gold Valley Ltd | Manchester | 2018 |
| Goldcorp Limited | Watford | 2024 |
| Golden Grebe Mining Limited | London | 2008 |
| Golden Sovereign Mines Limited | Louth | 2025 |
| Golden Star Mining Ltd | Surbiton | 2022 |
| Goldendraw Competitions Ltd | Poole | 2025 |
| Goldholme Stone Limited | Corby Glen Grantham | 2001 |
| Goldplat PLC | London | 2005 |
| Goldsheng(Germany) International Chemical Ltd | Cardiff | 2026 |
| Goldway Eclipse Limited | Whitby | 2013 |
| Gondwana Energy Limited | Maidstone | 2023 |
| Goodall Geoscience Limited | Fulletby Horncastle | 2000 |
| Goodbox Limited | Neath | 2000 |
| Gooding Consulting Limited | London | 2017 |
| Goonvean Aggregates Limited | St Austell | 2012 |
| Gordon Maciver Limited | Isle Of Lewis | 2018 |
| Gordon Mcneil Offshore Limited | Glasgow | 2014 |
| Gore Vega Limited | London | 2003 |
| Gorman Developments Limited | Omagh | 2025 |
| Gourley Subsea Engineering Limited | Aberdeenshire | 1996 |
| GOW Aggregates Limited | Halkirk | 2018 |
| Gower Quarrying Ltd | Swansea | 2013 |
| Gower Recycling Ltd | Swansea | 2012 |
| Gower Salt Limited | Swansea | 2025 |
| GP Electrical Solutions Limited | Broughty Ferry | 2025 |
| GP Equatorial Guinea Ltd | Nottingham | 2023 |
| GPA Well Services Ltd | Montrose | 2022 |
| Gpec Trading UK Ltd | London | 2011 |
| GPG Engineering UK Ltd | London | 2024 |
| GPS Inspections Limited | Ashbourne | 2018 |
| Gqss Limited | Perth | 2025 |
| Grace & Clarity Ltd | Glasgow | 2014 |
| Graeme Fisher Ltd | Aviemore | 2014 |
| Graeme Offshore Services Limited | Kirkcaldy | 2014 |
| Grafton Energy Ltd | London | 2021 |
| Graham Davis Petrophysics Company (Gdpc) Ltd | Liphook | 2025 |
| Graham Emmerson Engineering Ltd. | Aberdeen | 2008 |
| Graham Horne Consultants Ltd | Dunoon, Argyll | 2019 |
| Grahol (Services) Ltd. | | 2006 |
| Grail Energy Limited | Walsall | 2012 |
| Grampian Classic Projects Limited | Aberdeen | 2017 |