| Gaba Jewellers Limited | Wholesale & retail | 2004 |
| Gabriel Research and Management Limited | Professional & scientific | 2004 |
| Gabriel. Manu | | 1998 |
| Gafa Limited | Professional & scientific | 2008 |
| Gaia Brands Ltd | Manufacturing | 2003 |
| Galactic Pictures Limited | Administrative & support | 2010 |
| Gallanbur Ltd | Real estate | 2005 |
| Game Advertising & Design Services Ltd | Administrative & support | 2002 |
| Games Press Ltd | Information & communication | 2000 |
| Ganga Limited | Real estate | 1999 |
| Ganmat Consultancy UK Limited | Other services | 2007 |
| Ganvir Locums Limited | Wholesale & retail | 2003 |
| GAP (Properties) Ltd | Real estate | 1993 |
| Gardiners Hill Limited | Professional & scientific | 2018 |
| Gardsec Ltd | Construction | 2007 |
| Garnet Consulting Limited | Other services | 2009 |
| Garrett Developments Limited | Construction | 2002 |
| Garrick Services & Sales Limited | Construction | 2002 |
| Gary Hymns Limited | Professional & scientific | 2006 |
| GAS & Electric Limited | Administrative & support | 2005 |
| Gatebrook Services Limited | Real estate | 2002 |
| Gateway Import Export Limited | Transport & logistics | 2001 |
| Gathani (London) Limited | Wholesale & retail | 1951 |
| Gauge London Limited | Wholesale & retail | 2026 |
| Gavin Thomson Design Limited | Arts & recreation | 2005 |
| Gayaza Alumnae Network | Education | 2004 |
| GB Consulting Services Limited | Professional & scientific | 2021 |
| GB Impex Limited | Wholesale & retail | 2019 |
| GB Mechanical Services Ltd | Manufacturing | 2015 |
| GB Vignes Services Ltd | Professional & scientific | 2003 |
| GC Telecom (UK) Limited | Information & communication | 2003 |
| Gearoid. Phelan | | 1998 |
| Geek Productions Ltd | Arts & recreation | 2013 |
| Geeta Private Limited | Transport & logistics | 2025 |
| GEM Appointments Limited | Administrative & support | 1996 |
| GEM Contract Cleaning Services Limited | Administrative & support | 1998 |
| Gemelite Limited | Wholesale & retail | 1968 |
| Gemma Computer Systems Limited | Information & communication | 2006 |
| General Trading (UK) Limited | Transport & logistics | 2001 |
| Generation Purple Limited | Information & communication | 2019 |
| Genmed Capital Management Limited | Financial services | 2005 |
| Geo.R.Dunton & Co.Limited | Other services | 1960 |
| George Clark Interiors Limited | Construction | 2003 |
| George London Management Services Limited | Real estate | 2001 |
| Georges DE LA Chapelle Limited | Wholesale & retail | 2003 |
| Gerard Evans Ltd. | Information & communication | 2003 |
| Gerard. Mcnamara | | 1998 |
| German Travel Centre Limited | Administrative & support | 1987 |
| German Travel Service Limited | Extraterritorial | 1993 |
| GET Loans Limited | Administrative & support | 1974 |
| Ghazal Investments Limited | Construction | 2003 |
| Gilbey Associates Limited | Wholesale & retail | 1995 |
| Gill Creative Limited | Administrative & support | 2006 |
| Gills Immigration Law Ltd | Professional & scientific | 2005 |
| Gilson Properties Limited | Administrative & support | 2001 |
| Ginger FOX Cafe Ltd | Hospitality | 2021 |
| Ginni Enterprises Limited | Other services | 1991 |
| Giroux Software Consultancy Limited | Information & communication | 2008 |
| Gkall Limited | Real estate | 1998 |
| GL Drylining Limited | Construction | 2006 |
| Gladegale Limited | Real estate | 1984 |
| Gladiator Data Services Limited | Administrative & support | 1995 |
| Gladstone Developments Limited | Administrative & support | 2002 |
| Gladwin Construction Limited | | 1985 |
| Glaston Properties Limited | Construction | 2002 |
| Glebe Avenue Management Limited | Households | 1979 |
| Glen Company Services Limited | Professional & scientific | 1995 |
| Glen Vorlich Ltd | Real estate | 2002 |
| Glencoe Property Services Ltd | Real estate | 1999 |
| Glencor Limited | Construction | 1998 |
| Glengall Limited | Transport & logistics | 2002 |
| Glibro Services Limited | Professional & scientific | 2000 |
| Global Ardour Recycling Limited | Water & waste | 2024 |
| Global Business Consultancy Limited | Financial services | 2003 |
| Global Business Solutions UK Limited | Professional & scientific | 2004 |
| Global Cultural Exchange Limited | Extraterritorial | 2015 |
| Global Cyber Solutions Ltd | Information & communication | 2000 |
| Global Education Counselling Ltd | Administrative & support | 1998 |
| Global Enterprise Business Solutions Ltd | Information & communication | 2004 |
| Global Fuels Direct Limited | Real estate | 2006 |
| Global Haly Investments Limited | Extraterritorial | 2005 |
| Global Homes UK Limited | Real estate | 2007 |
| Global Immigration Management Limited | Other services | 2007 |
| Global Impex Trading Co. Limited | Other services | 1987 |
| Global IT Training Specialists Ltd | Education | 2025 |
| Global Network Technologies Ltd | Information & communication | 2004 |
| Global Rigging Limited | Administrative & support | 2003 |
| Global Telconsult Limited | Information & communication | 2004 |
| Global Teleconsult Limited | Information & communication | 2004 |
| Globe Electrical Contractors Limited | Construction | 1967 |
| Gloryjacob Limited | Hospitality | 2019 |
| GLS Installations Limited | Construction | 2007 |
| GMI Services Limited | Professional & scientific | 2007 |
| GN International Limited | Wholesale & retail | 2000 |
| GNQ Projects Ltd | Construction | 2020 |
| GNS Consultants Limited | Information & communication | 1995 |
| Gnsq Ltd | Administrative & support | 2003 |
| Go-Green Energy Services Ltd | Construction | 2024 |
| Gohil Construction Ltd | Construction | 2019 |
| Gold Coin Limited | Professional & scientific | 1996 |