| G58 Ltd | Real estate | 2023 |
| G6 Studio Limited | Professional & scientific | 2020 |
| G95 Ltd | Wholesale & retail | 2018 |
| GA Industries Ltd | Manufacturing | 2026 |
| Gabbychic Limited | Wholesale & retail | 2025 |
| Gabriel Parascan Limited | Manufacturing | 2017 |
| Gadabout Productions Limited | Information & communication | 2008 |
| Gadd Brothers Trees and Landscapes Ltd | Administrative & support | 2024 |
| Gaeaorganics Ltd | Other services | 2021 |
| Gaerstone Consulting Ltd | Agriculture & fishing | 2025 |
| Gagapy Ltd | Wholesale & retail | 2025 |
| Gaia Climate Group Limited | Construction | 2009 |
| Gaia Power CIC | Professional & scientific | 2025 |
| Gaianakind Limited | Professional & scientific | 2025 |
| Gaijin Sushi Ltd | Hospitality | 2017 |
| Gains Station Ltd | Wholesale & retail | 2026 |
| Gait and Motion Technology Ltd | Professional & scientific | 2018 |
| Galax Web Ltd | Wholesale & retail | 2012 |
| Galaxy Facilities Limited | Manufacturing | 2021 |
| Galivantio Ltd | Wholesale & retail | 2024 |
| Gamble Controls Ltd | Professional & scientific | 2009 |
| Game Setup Center Ltd | Wholesale & retail | 2025 |
| Gameplan Marketing Limited | Information & communication | 2022 |
| Gaming Vault HQ Ltd | Wholesale & retail | 2025 |
| Gammax Independent Inspection Services Limited | Professional & scientific | 1995 |
| Gardens ARB Business Ltd | Administrative & support | 2014 |
| Garfield House Ltd | Real estate | 2023 |
| Gargie Property Management Ltd | Real estate | 2025 |
| Gari Systems Ltd | Information & communication | 2026 |
| Gari Transport Ltd | Transport & logistics | 2023 |
| Garni BIO Ltd | Professional & scientific | 2025 |
| Garrancho Law Limited | Professional & scientific | 2016 |
| Garrard Crafted Limited | Construction | 2025 |
| Gary Peachey Funeral Service Limited | Other services | 2023 |
| GAS Professional Ltd | Construction | 2016 |
| Gas-Elec Bureau (UK) Limited | Administrative & support | 2016 |
| Gas-Elec Holdings Limited | Administrative & support | 2016 |
| Gas-Elec Safety (UK) Ltd | Professional & scientific | 2016 |
| Gascoynes (Norfolk) Limited | Professional & scientific | 2018 |
| Gascoynes Limited | Professional & scientific | 2003 |
| Gascoynes Service Charge Accountants Limited | Professional & scientific | 2012 |
| Gassan's Service Ltd | Wholesale & retail | 2026 |
| Gastronomica Market Ltd | Wholesale & retail | 2015 |
| Gata Capital Limited | Financial services | 2026 |
| Gata Group Ltd | Financial services | 2018 |
| Gatecrash Films CIC | Education | 2026 |
| Gateway Building Control Ltd | Professional & scientific | 2015 |
| Gateway Business Solutions Ltd | Professional & scientific | 2019 |
| Gatford Electrical Ltd | Construction | 2025 |
| Gatherer Systems Ltd | Manufacturing | 2012 |
| Gatine Limited | Wholesale & retail | 2021 |
| Gatten Ltd | Water & waste | 2024 |
| Gatwick M.C. Limited | Real estate | 1987 |
| Gavin Moody Farriers Limited | Administrative & support | 2007 |
| Gaysians Ltd | Information & communication | 2026 |
| Gaywood Investments Limited | Administrative & support | 2013 |
| Gayze Labs Ltd | Information & communication | 2026 |
| Gaziofg Ltd | Wholesale & retail | 2026 |
| GB Horseracing Services LLP | | 2014 |
| GBD Properties Ltd | Real estate | 2021 |
| GBI Ltd | Financial services | 2020 |
| Gbnp Ltd | Information & communication | 2025 |
| GBR Investments Ltd | Real estate | 2024 |
| GCC Dynamics Limited | Information & communication | 2015 |
| GCC Group Limited | Financial services | 2017 |
| GCC Innova Limited | Information & communication | 1992 |
| GCL Property Holdings Ltd | Real estate | 2016 |
| GCS Ltd | Administrative & support | 2022 |
| GDT Housing Ltd | Hospitality | 2026 |
| GEE Chauffeur Service Ltd | Transport & logistics | 2025 |
| GEE Gees Racing Ltd | Arts & recreation | 2026 |
| Geecol Wellness Limited | Other services | 2007 |
| Geekss UK Limited | Information & communication | 2021 |
| Geespace Limited | Wholesale & retail | 2025 |
| Geld Digital UK Limited | Information & communication | 2025 |
| GEM Heating Solutions Limited | Construction | 2018 |
| GEM Traders Ltd | Wholesale & retail | 2024 |
| Gemafric Ltd | Manufacturing | 2021 |
| Gemini Community Projects Limited | Financial services | 2026 |
| Gemma’S Hair Glory Ltd | Other services | 2026 |
| Gems Nursery Ltd | Information & communication | 2023 |
| Gemstones Assets Limited | Wholesale & retail | 2019 |
| General B.M.S Ltd | Construction | 2019 |
| Generation Sought After Limited | Health & social care | 2024 |
| Genesis Recruitment Group Ltd | Administrative & support | 2024 |
| Genext Group Limited | Other services | 2024 |
| Genius Media Limited | Information & communication | 2018 |
| Geniusflow Limited | Wholesale & retail | 2026 |
| Genix Holdings Limited | Professional & scientific | 1995 |
| Genner Stage Engineering Ltd | Professional & scientific | 2020 |
| Genteel Ltd | Construction | 2018 |
| Gentle Cat Co., Ltd | Wholesale & retail | 2025 |
| Gentle Dental Practices Limited | Health & social care | 2010 |
| Genziers Ltd | Wholesale & retail | 2025 |
| GEO Events Ltd | Administrative & support | 2025 |
| GEO. E. Gittus & Sons Limited | Agriculture & fishing | 1958 |
| GEOLAN3D Limited | Professional & scientific | 2024 |
| Geopolitics Ltd | Administrative & support | 2019 |
| George Arthur Limited | Professional & scientific | 2001 |
| George Avenue Homes Limited | Real estate | 2024 |