| Gabrielle Close Property Limited | Real estate | 2007 |
| Gajanan Ltd | Wholesale & retail | 2024 |
| Galaiya Properties Limited | Construction | 2005 |
| Galaiya Property Management Limited | Real estate | 2017 |
| Galaxie Properties Limited | Real estate | 2012 |
| Galaxy Mobile & Vape Limited | Wholesale & retail | 2023 |
| Galaxy Mobile and Vape (Stanmore) Ltd | Manufacturing | 2025 |
| Galaxy Shows (London) Limited | Arts & recreation | 2017 |
| Galaxy Superstars Limited | Arts & recreation | 1996 |
| Galaxy Way Ltd | Real estate | 2024 |
| Galcross Movement Monitoring Limited | Construction | 2017 |
| Galizasouzapromotions Ltd | Professional & scientific | 2025 |
| Game-Changer PX Limited | Administrative & support | 2023 |
| Games 4 Ebusiness Limited | Information & communication | 2015 |
| Gandiva BOW Ltd | Real estate | 2017 |
| Garavelli Limited | Wholesale & retail | 2026 |
| Gardron Limited | Extraterritorial | 2022 |
| Gareenvillagecleaning Ltd | Administrative & support | 2025 |
| Garricks Wellness Limited | Other services | 2026 |
| Garthwaite Creative Works Ltd | Information & communication | 2024 |
| Garvan Group Limited | Professional & scientific | 2019 |
| Garvey Bros Builders Limited | Construction | 2021 |
| Garvey Bros Limited | Construction | 2021 |
| Gasper.Co Ltd | Wholesale & retail | 2020 |
| Gateshead Properties LLP | | 2013 |
| Gateway House RTM Company Limited | Households | 2020 |
| Gateway Sports UK Ltd | Wholesale & retail | 2026 |
| Gathe Consulting Limited | Information & communication | 2017 |
| Gaulthier Limited | Arts & recreation | 2013 |
| Gaureesa LLP | | 2025 |
| Gautham's Kitchen Ltd | Hospitality | 2019 |
| Gavin Mechanical Services Ltd | Other services | 2015 |
| Gavin Property Services Ltd | Real estate | 2024 |
| GB & SG Construction Ltd | Construction | 2023 |
| GB Competiti Ltd | Wholesale & retail | 2025 |
| GB Development Limited | Construction | 2003 |
| GB Food & Wine Private Limited | Wholesale & retail | 2025 |
| GB Healthcare Limited | Wholesale & retail | 1999 |
| Gbop Limited | Education | 2019 |
| GBR Solutions Limited | Construction | 2014 |
| Gbrici Services Ltd | Construction | 2023 |
| GC Holiday Lettings Limited | Real estate | 2025 |
| GC Lettings Limited | Extraterritorial | 2012 |
| GCM Capital (London) Ltd | Real estate | 2023 |
| GDI Electric Service's Ltd | Construction | 2022 |
| Gdl&Construction Ltd | Construction | 2020 |
| GDS Trans Ltd | Transport & logistics | 2015 |
| GDS Velocity Limited | Information & communication | 2014 |
| GEE KAY Farrar Business School Limited | Education | 2009 |
| GEE KAY Farrar Group Ltd | Professional & scientific | 2011 |
| GEE KAY Farrar Limited | Professional & scientific | 2003 |
| GEL Logistics Limited | Transport & logistics | 2019 |
| Gematch Limited | Information & communication | 2010 |
| Gemdar Ltd | Financial services | 2020 |
| Gemini Transcription Ltd | Extraterritorial | 2012 |
| Gemma Reidy Limited | Professional & scientific | 2017 |
| GEN122 Limited | Administrative & support | 2009 |
| Generate Advisory Ltd | Professional & scientific | 2017 |
| Genesis Interiors Solutions Limited | Construction | 2016 |
| Genesis Systems Limited | Information & communication | 2007 |
| Geneva Court RTM Company Limited | Households | 2011 |
| Gentlemen Baristas Three Limited | Hospitality | 2020 |
| Gentlemen Baristas Two Limited | Hospitality | 2020 |
| George Cross Estates (Basingstoke) Limited | Construction | 1934 |
| George Mitchell Productions Limited | Arts & recreation | 1963 |
| George Towers Ltd | Real estate | 2024 |
| George&Son Grab Hire Ltd | Water & waste | 2025 |
| Georges Wood Properties Ltd | Real estate | 2018 |
| Georgia Jones Limited | Other services | 2015 |
| Geri-Gadgets Limited | Manufacturing | 2024 |
| German Group Ltd | Construction | 2020 |
| Geromuk Solutions Limited | Transport & logistics | 2010 |
| Gerrans Bay Private Hire Limited | Extraterritorial | 2015 |
| Gerrans Bay Taxis Limited | Transport & logistics | 2014 |
| Gfibre Group Ltd | Construction | 2023 |
| Gfibre Ltd | Information & communication | 2016 |
| GG Corp Ltd | Wholesale & retail | 2026 |
| GG-887-393 Limited | Real estate | 2023 |
| GGA Construction Limited | Construction | 2014 |
| GH Accountants Limited | Professional & scientific | 2024 |
| GHA7 Limited | Real estate | 2022 |
| Ghostrider Limited | Extraterritorial | 2004 |
| GI Doctors Limited | Health & social care | 2013 |
| Gidea Park College Limited | Education | 1962 |
| Gift Cake Ltd | Manufacturing | 2022 |
| Giftsound Limited | Wholesale & retail | 2019 |
| Giglio System Program Ltd | Financial services | 2021 |
| GII Capital Advisors Limited | Financial services | 2016 |
| GII Finance Network Limited | Financial services | 2014 |
| GIK Developments Limited | Construction | 2022 |
| Gilead Homes Limited | Health & social care | 2020 |
| Girapp Innovations Limited | Information & communication | 2014 |
| Gita SAI Limited | Real estate | 2000 |
| Givory Ltd | Hospitality | 2025 |
| GJM Southern Group Ltd | Construction | 2015 |
| Gkkc Limited | Administrative & support | 2017 |
| Gladstone Accountancy Services Limited | Professional & scientific | 2016 |
| Gladstone Freeholds Limited | Real estate | 1999 |
| Glamour Hatfield 2 Limited | Other services | 2023 |
| Glandore Media Ltd | Professional & scientific | 2015 |