| Goldmaid Residents Association Limited | Households | 1984 |
| Goldmanread Ltd | Financial services | 2013 |
| Goldshire Capital Invest LLP | | 2025 |
| Goldstar Travel (Services) Ltd | Transport & logistics | 2014 |
| Goldstone Capital Europe Ltd | Professional & scientific | 2015 |
| Goldstone Training and Consultancy Services Limited | Information & communication | 2011 |
| Goldway Management Ltd | Hospitality | 1996 |
| Golf Shaft Alignment Ltd | Other services | 2013 |
| Golfingbliss Ltd | Wholesale & retail | 2026 |
| Gollden Fortune Limited | Wholesale & retail | 2026 |
| Good Experience Ltd. | Construction | 2018 |
| Good Guides Tuition Ltd | Education | 2023 |
| Good Home Realty Limited | Real estate | 2018 |
| Good JOB Services Ltd | Professional & scientific | 2024 |
| Good Vibrations Watford Community Interest Company | Health & social care | 2024 |
| Good Wood Gang Ltd | Extraterritorial | 2016 |
| Good Works Holdings Ltd | Professional & scientific | 2016 |
| Good Works Innovations Ltd | Information & communication | 2016 |
| GOOD4EARS Ltd | Professional & scientific | 2016 |
| Goodeffect Limited | Professional & scientific | 1999 |
| Goodlife Care Services Ltd | Health & social care | 2023 |
| Goodman Family Investments Limited | Professional & scientific | 1996 |
| Goodmen Ltd | Professional & scientific | 2007 |
| Goodrum Electric Gates Ltd | Administrative & support | 2023 |
| Goodvine Ltd | Wholesale & retail | 2020 |
| Goodwill Motors Ltd | Wholesale & retail | 2011 |
| Goodyer Limited | Construction | 2000 |
| Gooey Cookies Ltd | Hospitality | 2025 |
| Googna Ltd | Health & social care | 2015 |
| Goon IT Ltd | Information & communication | 2011 |
| Goose Media Solutions Ltd | Information & communication | 2026 |
| Gorakkar Homes Limited | Real estate | 2021 |
| Gordinho Garage Limited | Wholesale & retail | 2024 |
| Gorhambury GUN Club Ltd | Agriculture & fishing | 2013 |
| Gori Construction Ltd | Construction | 2017 |
| Gorilla Organic Limited | Wholesale & retail | 2025 |
| Gossuva Marketing Limited | Information & communication | 2023 |
| Gosway Properties Limited | Real estate | 2020 |
| Gourmet Associates Limited | Hospitality | 2020 |
| Gourmet NO5 Ltd | Hospitality | 2023 |
| Gourmet Pizza & Desserts Ltd | Hospitality | 2020 |
| Governor Property Limited | Real estate | 2025 |
| Govtalk Limited | Professional & scientific | 2018 |
| Gowri Pro Ltd | Real estate | 2025 |
| Goxhaj Properties Ltd | Real estate | 2025 |
| GPB IT Consulting Ltd | Information & communication | 2010 |
| GPM Brickwork Limited | Construction | 2014 |
| GQ & Sons Roofing and Building Limited | Construction | 2011 |
| GQ & Sons Roofing and Solar Energy Limited | Construction | 2011 |
| GQ Cars Ltd | Professional & scientific | 2024 |
| GR Envisioneer Ltd | Construction | 2024 |
| GR Hill Consultancy Services Limited | Professional & scientific | 2022 |
| GR8 Analytics Ltd | Professional & scientific | 2026 |
| Grace Altar Mission International | Other services | 2012 |
| Grace Beauty Laser Clinic Ltd | Other services | 2018 |
| Grace Legacy Ltd | Real estate | 2023 |
| Gracehart Ltd | Information & communication | 2022 |
| Gracemoore Properties Limited | Real estate | 2006 |
| Grad Films Ltd | Information & communication | 2011 |
| Grade 1 Hair Limited | Other services | 2015 |
| Gradevski Services Ltd | Wholesale & retail | 2019 |
| Graeme Bunn Consultancy Limited | Real estate | 2022 |
| Grafculture Limited | Professional & scientific | 2017 |
| Graffic Limited | Construction | 2003 |
| Graham Smith PL Limited | Extraterritorial | 2020 |
| Graham Smith Property Lawyers LLP | | 2014 |
| Graigwen Footwear Ltd | Manufacturing | 2023 |
| Graintrading Commodities Limited | Wholesale & retail | 2015 |
| Grand Builders Ltd | Construction | 2018 |
| Grand Consulting UK Ltd | Extraterritorial | 2022 |
| Grand Line Deals Ltd | Wholesale & retail | 2026 |
| Grand Strategy Solutions Ltd | Water & waste | 2021 |
| Grandfield Developments Limited | Construction | 1999 |
| Grandma's Kitchen Caribbean Cuisine Ltd | Hospitality | 2025 |
| Grandslam Padel Ltd | Arts & recreation | 2025 |
| Grandview Management Limited | Real estate | 2008 |
| Grange Designs UK Ltd | Manufacturing | 2017 |
| Grange Hill Developments Limited | Real estate | 1994 |
| Grange Walsall Ltd | Construction | 2019 |
| Granite Building Warranties Ltd | Financial services | 2018 |
| Grant Investment Trust Limited | Real estate | 1938 |
| Grant Joinery / Building Ltd | Construction | 2016 |
| Grant Services Limited | Wholesale & retail | 1995 |
| Granville Management (ST. Albans) Limited | Households | 2006 |
| Grapevine Communications (London) Limited | Information & communication | 2002 |
| Graphics Euro Limited | Manufacturing | 2015 |
| Graphite Grey Visuals Limited | Professional & scientific | 2013 |
| Grass Slade Consulting Ltd | Professional & scientific | 2017 |
| Grassrootspadel Ltd | Information & communication | 2018 |
| Gravity Broadcast Limited | Professional & scientific | 2000 |
| Gravity Media (UK.) Ltd | Information & communication | 1993 |
| Gravity Media Group Holdings Limited | Professional & scientific | 2016 |
| Gravity Media Group Limited | Professional & scientific | 1999 |
| Gravity Media Group UK Holdings Limited | Professional & scientific | 2015 |
| Gravity Media North Limited | Information & communication | 2008 |
| Gravity Select Limited | Administrative & support | 2016 |
| Gray's Inn Developments 6 Limited | Real estate | 2017 |
| Gray's Inn Developments Limited | Real estate | 2010 |
| Gray's Inn Estates (London) Limited | Real estate | 1994 |
| Gray's Inn Estates Limited | Real estate | 1987 |