| Futronics Power Designs Limited | Manufacturing | 1998 |
| G Dale Developments Ltd | Real estate | 2016 |
| G J Guinan & Co Ltd | Professional & scientific | 2016 |
| G Minoli Ltd | Information & communication | 2015 |
| G Morris Decorations and Refurbishment Limited | Construction | 2021 |
| G P Sales Limited | Wholesale & retail | 2017 |
| G Woodham Consultancy Limited | Professional & scientific | 2024 |
| G&T Property Assets Limited | Real estate | 2025 |
| G. & a. Kirsten Limited | Other services | 1967 |
| G.L.Smith & Sons Limited | Real estate | 2008 |
| G2 Architecture Limited | Professional & scientific | 2023 |
| Gadgets Inn Ltd | Wholesale & retail | 2018 |
| Gain Momentum Marketing Ltd | Professional & scientific | 2012 |
| Galaxy Consulting Ltd | Professional & scientific | 2020 |
| Galley Associates Limited | Hospitality | 2014 |
| Games & Collectibles Ltd | Wholesale & retail | 2026 |
| Garage 86 Ltd | Wholesale & retail | 2022 |
| Gardenia Beauty Ltd | Health & social care | 2019 |
| Garsington Energy Limited | Extraterritorial | 2011 |
| GAS Master Plumbing Ltd | Construction | 2023 |
| Gathering Dreams Limited | Information & communication | 2019 |
| GBT123 Limited | Professional & scientific | 2015 |
| Gceet Holdings Ltd | Real estate | 2023 |
| GD Capital Investments Ltd | Financial services | 2025 |
| Gege Ltd | Wholesale & retail | 2019 |
| Generalphase Limited | Administrative & support | 1997 |
| Genesis Architects Ltd. | Professional & scientific | 2003 |
| Genesis Jewellers Limited | Wholesale & retail | 2026 |
| Gennaker One Ltd | Information & communication | 2013 |
| Geo-Sphere 4D Limited | Professional & scientific | 2012 |
| George Baker (Insurance Brokers) Limited | Financial services | 1952 |
| George Parkes Films Limited | Information & communication | 2018 |
| Georgeson Investments Limited | Real estate | 2022 |
| Georgiou Escape Ltd | Arts & recreation | 2019 |
| GET a Grip Tyre & Mechanical Services Limited | Wholesale & retail | 2018 |
| Ggdx Ltd | Information & communication | 2019 |
| Gi-Tech Ltd | Wholesale & retail | 2023 |
| Gibbs-Sandtech Limited | Manufacturing | 2001 |
| Glass Bending and Decorating Limited | Manufacturing | 1984 |
| Glenayr Consulting Limited | Administrative & support | 2019 |
| Glensto Limited | Construction | 2016 |
| Glm-Uk Ltd | Administrative & support | 2024 |
| Global Plant Solutions Ltd | Wholesale & retail | 2018 |
| GLP Heating Limited | Construction | 2024 |
| GLR Scooters Hoddesdon Limited | Wholesale & retail | 2008 |
| GLT Transport Solutions Ltd | Transport & logistics | 2025 |
| GNO Electrical Ltd | Construction | 2022 |
| Go Green Recycling and Waste Ltd | Water & waste | 2022 |
| Go Lean Project Ltd | Other services | 2025 |
| Godfrey Environmental Services Ltd | Administrative & support | 2020 |
| Godwin House Limited | Households | 2021 |
| Golden Event Logistics Ltd | Administrative & support | 2024 |
| Goldfinch Landscapes Limited | Administrative & support | 1988 |
| Gomono London Limited | Hospitality | 2016 |
| Gone in 60 Ltd | Information & communication | 2016 |
| Gooch Carpentry & Refurbishments Limited | Construction | 2008 |
| Goodlook Brow Bar Ltd | Wholesale & retail | 2023 |
| Goodwin Creative Ltd | Information & communication | 2026 |
| Gospel Court Management Limited | Real estate | 2015 |
| GP Property (Bristol) Ltd | Real estate | 2021 |
| GP Tyrehouse Limited | Wholesale & retail | 2019 |
| Grace CPL Ltd | Manufacturing | 2006 |
| Graham's Taxis Limited | Transport & logistics | 2020 |
| Grandfort Limited | Construction | 2011 |
| Grange Plumbing Limited | Construction | 2018 |
| Granville Forbes Architects Ltd | Professional & scientific | 2020 |
| Grape Escapes Limited | Administrative & support | 2004 |
| Grape Escapes Transport Limited | Administrative & support | 2012 |
| Grassroots Landscapes Ltd | Administrative & support | 2014 |
| Great Mahun Ltd | Wholesale & retail | 2010 |
| Great Oak Court Management Company (II) Limited | Professional & scientific | 2008 |
| Greater Human Ltd | Professional & scientific | 2018 |
| Green END Timber Frame Ltd | Construction | 2024 |
| Green Energy (UK) Limited | Administrative & support | 2001 |
| Green Energy Electricity Limited | Extraterritorial | 2011 |
| Green Energy GAS Limited | Extraterritorial | 2013 |
| Green Energy Limited | Energy | 2009 |
| Green Performance Ltd | Health & social care | 2021 |
| Greenfields R & L Limited | Construction | 2006 |
| Greenlite Controls Limited | Extraterritorial | 1975 |
| Greenway Trading Ltd | Construction | 2018 |
| Greenways (Ware) Residents Company Ltd | Real estate | 1993 |
| Grey Cells Energy Ltd | Information & communication | 2015 |
| Grifi Productions Ltd | Information & communication | 2021 |
| Griggs Electrical Contractors Limited | Construction | 2024 |
| Grill Chicken & Kebab Limited | Hospitality | 2025 |
| Growtion Ltd | Administrative & support | 2015 |
| Gspk Circuits Limited | Manufacturing | 1995 |
| Gspk Design Limited | Extraterritorial | 2000 |
| Gtek Foods Limited | Wholesale & retail | 2008 |
| Gulbenkian OIL Limited | Professional & scientific | 2010 |
| Gwilgo UK Limited | Wholesale & retail | 2005 |
| GWR Cafe Ltd | Hospitality | 2016 |
| Gymdough Ltd | Hospitality | 2024 |
| H & a Lopata Limited | Professional & scientific | 2007 |
| H a Lodge Ltd | Real estate | 2025 |
| H&Z Noodle K Ltd | Hospitality | 2024 |
| H.A.M Enterprises Ltd | Real estate | 2023 |
| H.C. Management (S.A.) Ltd | Households | 1996 |
| HA002 Limited | Energy | 2014 |