| Greybeard IT Limited | Information & communication | 2014 |
| Greyfrut Ltd | Hospitality | 2025 |
| Greyhound Racing UK CIC | Other services | 2025 |
| Greystead Properties Limited | Real estate | 1962 |
| Grft Ltd | Health & social care | 2022 |
| Grid Developments Limited | Financial services | 2023 |
| Griffin Corp Ltd | Real estate | 2023 |
| Griffin Fibre Ltd | Construction | 2024 |
| Griffin Franchise Group Ltd | Real estate | 2020 |
| Griffin Residential Block Management Limited | Real estate | 2020 |
| Griggs Court Residents Company Limited | Real estate | 1990 |
| Grill & Destroy Ltd | Hospitality | 2025 |
| Grill Sessions Ltd | Hospitality | 2025 |
| Grilla Fitness Limited | Wholesale & retail | 2014 |
| Griller Land London Limited | Hospitality | 2019 |
| Grillfire Charcoals Ltd | Professional & scientific | 2024 |
| Grimbledme Limited | Real estate | 2021 |
| Grind Romford Limited | Hospitality | 2022 |
| Grip Holding Ltd | Financial services | 2015 |
| Grizzly Engineering Limited | Construction | 2018 |
| Grizzly Ltd | Information & communication | 2025 |
| Gro-Do Ltd | Construction | 2014 |
| Groggy Ltd | Hospitality | 2023 |
| Groom Global Ltd | Administrative & support | 2020 |
| Groove Culture Ltd | Wholesale & retail | 2026 |
| Grosvenor Investigations Limited | Administrative & support | 2018 |
| Grosvenor Windows (London) Limited | Construction | 2005 |
| Groundline Ltd | Wholesale & retail | 2026 |
| Groundshaker ENT Limited | Arts & recreation | 2023 |
| Groundwork SC Ltd | Construction | 2026 |
| Group Construction Ltd | Construction | 2019 |
| Grov Limited | Health & social care | 2002 |
| Grove Accident Repair Ltd | Wholesale & retail | 2025 |
| Grove Green Developments Ltd | Real estate | 2014 |
| Grove Road General Store Ltd | Wholesale & retail | 2024 |
| Grow Hill Ltd | Wholesale & retail | 2024 |
| Grow Rogue Ltd | Professional & scientific | 2022 |
| Growing Independent Free Trade Limited | Administrative & support | 2007 |
| Grownus Limited | Construction | 2019 |
| Growth Academy Center Ltd | Education | 2024 |
| Growth Bomb Limited | Manufacturing | 2021 |
| Growthstep Properties Limited | Real estate | 2026 |
| Grubify Ltd | Information & communication | 2023 |
| Gruzdai Ltd | Wholesale & retail | 2019 |
| Grwn Entertainment Limited | Information & communication | 2025 |
| GS Building Work UK Ltd | Construction | 2026 |
| GS Couriers London Ltd | Transport & logistics | 2026 |
| GS Forest Products Ltd | Wholesale & retail | 2017 |
| GS Improvements Ltd | Real estate | 2023 |
| GS Spectrum Ltd | Manufacturing | 2017 |
| GSB Facades Ltd | Construction | 2025 |
| Gsgroup 2016 Ltd | Construction | 2016 |
| Gsms Lettings Ltd | Real estate | 2019 |
| GSO Support Services Ltd | Administrative & support | 2024 |
| GSR Trade Ltd | Wholesale & retail | 2025 |
| Gsrconstrution Limited | Construction | 2023 |
| GSS Acquisitions Ltd | Real estate | 2025 |
| GSS Communications Ltd | Wholesale & retail | 2012 |
| GSS Corporation Ltd | Wholesale & retail | 2016 |
| GSV Motors Ltd | Wholesale & retail | 2022 |
| GTC Group Ltd | Wholesale & retail | 2024 |
| Gtech Accessories Ltd | Wholesale & retail | 2020 |
| GTI Building Ltd | Construction | 2018 |
| GTL Holdings (Stortford) Limited | Financial services | 2013 |
| GTS Projects Ltd | Wholesale & retail | 2018 |
| GTX Solutions Ltd | Construction | 2025 |
| Guardian Angel Services Limited | Extraterritorial | 2018 |
| Guardian Work & Safety Ltd | Wholesale & retail | 2026 |
| Guards UP Ltd | Administrative & support | 2016 |
| Guardsafe Limited | Professional & scientific | 2003 |
| Guerrilla Marketing Group Ltd | Other services | 2025 |
| Guidance THR Maze Consultancy Limited | Health & social care | 2020 |
| Guiding Harbour Homes Ltd | Real estate | 2023 |
| Gujjar Courier Ltd | Transport & logistics | 2026 |
| GUL Catering Ltd | Hospitality | 2026 |
| GUL Electric Limited | Construction | 2022 |
| Gulfam Dynamics Limited | Wholesale & retail | 2025 |
| Gumax Limited | Administrative & support | 2015 |
| Gumeni Construction Limited | Construction | 2023 |
| Guna Technologies Ltd | Information & communication | 2012 |
| Guncrete Specialist Ltd | Construction | 2012 |
| Gurmeet Singh Purewal Ltd | Construction | 2015 |
| Gurshan Construction Ltd | Construction | 2018 |
| Guru Global Associates Limited | Administrative & support | 2007 |
| Gusto BLK Ltd | Hospitality | 2025 |
| Gusto DI Brunch Limited | Hospitality | 2024 |
| Guvvy Studios Ltd | Information & communication | 2025 |
| Guzel 8 Ltd | Other services | 2025 |
| GW Chinese Limited | Hospitality | 2024 |
| GW Thompson Limited | Information & communication | 1993 |
| GW Tiling and Flooring Ltd | Construction | 2021 |
| Gymbuilt Ltd | Wholesale & retail | 2025 |
| GZ Hair & Beauty Salon Limited | Other services | 2018 |
| GZ Pro Building Ltd | Construction | 2026 |
| G’Alexandr Company Ltd | Construction | 2023 |
| H & M Home Development Ltd | Real estate | 2024 |
| H & R Construction Limited | Manufacturing | 2012 |
| H & R Outsourcing Ltd | Administrative & support | 2023 |
| H & S Bikes Ltd | Wholesale & retail | 2025 |
| H & S Building Solutions Limited | Construction | 2018 |