| GC Biodiversity Solutions Limited | Wholesale & retail | 2025 |
| Gc-Eltech Ltd | Construction | 2018 |
| GCB Plumbing and Heating Ltd | Construction | 2024 |
| GD Cricket Coaching Ltd | Education | 2024 |
| GDA Carpentry (Banbury) Ltd | Manufacturing | 2026 |
| Gdbama Limited | Professional & scientific | 2026 |
| Gear Shift Strategies LLP | | 2025 |
| Geeky Gremlin Ltd | Wholesale & retail | 2020 |
| Genie Paediatrics Ltd | Health & social care | 2024 |
| Genome Property Limited | Real estate | 2017 |
| Genz Traders Ltd | Wholesale & retail | 2025 |
| Geoff W Jeal Sculpture Limited | Arts & recreation | 2024 |
| Geomarg Foods Ltd | Manufacturing | 2024 |
| Gerrards Cross Kitchens Limited | Construction | 2022 |
| GEV Construction Ltd | Construction | 2024 |
| GH Fallen Stock Company Limited | Agriculture & fishing | 2020 |
| Ghawk Accounting Ltd | Professional & scientific | 2019 |
| Ghks Consulting Ltd | Professional & scientific | 2023 |
| Ghorban Cafe Veneto Limited | Hospitality | 2017 |
| GIA One Driver Ltd | Education | 2024 |
| Giant Leap Event Management Limited | Administrative & support | 2002 |
| Giant Leap Property Limited | Real estate | 2006 |
| Gibney Ltd | Hospitality | 2020 |
| Giffer Lighting Limited | Professional & scientific | 2008 |
| Gigo Leisure Limited | Construction | 2015 |
| Gill Logistics Private Limited | Transport & logistics | 2025 |
| Ginger PIG Limited | Manufacturing | 2000 |
| Ginini UK Limited | Financial services | 2018 |
| Giovane Limited | Wholesale & retail | 2023 |
| Giraffe Indices Two Limited | Financial services | 2018 |
| Girasol Homes Ltd | Administrative & support | 2006 |
| Giraviu Ltd | Professional & scientific | 2017 |
| GJC Aesthetics Ltd | Health & social care | 2024 |
| GKO Pawelec Ltd | Arts & recreation | 2026 |
| GL Transport Solutions Ltd | Transport & logistics | 2020 |
| Glass Modern Ltd | Other services | 2019 |
| Glasspart (U.K.) Limited | Professional & scientific | 1989 |
| Glazeparts (U.K.) Limited | Professional & scientific | 1989 |
| Glazpart Holdings Limited | Financial services | 1998 |
| Glazpart Limited | Manufacturing | 1985 |
| GLD Property Investment Ltd | Real estate | 2026 |
| GLE Consulting Limited | Professional & scientific | 2022 |
| Glebe Barn Consultancy Ltd | Administrative & support | 2010 |
| Glebe Shotteswell Limited | Agriculture & fishing | 2006 |
| Glenleigh Property Limited | Real estate | 2024 |
| Glideflow Consulting Limited | Professional & scientific | 2024 |
| Glitch(Uk) Limited | Hospitality | 2026 |
| Global Candidate Vault Limited | Administrative & support | 2013 |
| Global Collections Ltd | Financial services | 2017 |
| Global Network 2013 Ltd | Information & communication | 2013 |
| Gluft Ltd | Hospitality | 2009 |
| Glynn Carpentry Ltd | Manufacturing | 2025 |
| GMC Doors Ltd | Professional & scientific | 2023 |
| Gmcq Consulting Ltd | Administrative & support | 2019 |
| GMG Planning Limited | Administrative & support | 2021 |
| Gmkc Ltd | Professional & scientific | 2015 |
| GN & LC Pollard Limited | Construction | 2003 |
| Go 2 Site Solutions Ltd | Administrative & support | 2026 |
| Go Bette Ltd | Wholesale & retail | 2020 |
| Go Lean Ltd | Manufacturing | 2018 |
| Go to EV Limited | Construction | 2020 |
| Goco Media Ltd | Administrative & support | 2007 |
| Godden Developments Limited | Real estate | 2002 |
| Godswell Physiotherapy Limited | Health & social care | 2002 |
| Gold Leaf Property Management Company Ltd | Real estate | 2015 |
| Goldbug Productions Ltd | Information & communication | 2026 |
| Golden Hawk Limited | Real estate | 2011 |
| Golden Thread Stitches Limited | Wholesale & retail | 2022 |
| Goldi Cleaning Services Ltd | Administrative & support | 2020 |
| Goldway Consulting Ltd | Transport & logistics | 2025 |
| Golf Course Gardens Ltd | Administrative & support | 2022 |
| Good Game Ltd | Wholesale & retail | 2023 |
| Good Shepard Ltd | Health & social care | 2026 |
| GOOD2GO HR Solutions Ltd | Administrative & support | 2024 |
| Goode Reclamation Supplies Limited | Extraterritorial | 2023 |
| Goode Stone Supplies Limited | Manufacturing | 2010 |
| Goodridge Properties (Northampton) Ltd | Real estate | 2025 |
| GP Marquees Ltd | Manufacturing | 2000 |
| GPG Consultancy Services Ltd | Professional & scientific | 2021 |
| GR Group (PVT) Ltd | Wholesale & retail | 2024 |
| Grace & Glamour Beauty Salon Ltd | Other services | 2026 |
| Grace 1442 Limited | Hospitality | 2022 |
| Grace AI Ltd | Professional & scientific | 2025 |
| Grace Point Alliance Ltd | Professional & scientific | 2024 |
| Graded Holdings Ltd | Financial services | 2021 |
| Gradedsales Ltd | Wholesale & retail | 2019 |
| Graeme Hills Consultancy Services Limited | Professional & scientific | 2018 |
| Graf UK Limited | Wholesale & retail | 2013 |
| Graham Transport and Logistics Limited | Transport & logistics | 2018 |
| Grand Prix Sportique Limited | Extraterritorial | 2017 |
| Grandeur Coffee Ltd | Wholesale & retail | 2025 |
| Grange Transport Consulting Ltd | Other services | 2021 |
| Grangecare Limited | Public administration | 2018 |
| Grant Goddard Plumbing Services Limited | Construction | 2014 |
| Graphic Image Films Limited | Wholesale & retail | 1990 |
| Graphit Systems Limited | Manufacturing | 2015 |
| Gravotech Limited | Wholesale & retail | 1946 |
| Gravy for the Brain Ltd | Information & communication | 2013 |
| Great TEW Stone Ltd | Manufacturing | 2024 |
| Great Wharf Properties Limited | Real estate | 2020 |