| GDN Properties Ltd | Real estate | 2019 |
| Gdpr in Education Ltd | Information & communication | 2012 |
| Geared Consulting Partnerships Ltd | Professional & scientific | 2019 |
| Gecko AI Ltd | Information & communication | 2025 |
| Gecko Learning Ltd | Education | 2010 |
| GEJ Estates Limited | Real estate | 2025 |
| Gels Property Limited | Real estate | 2020 |
| Gemstone Consulting Limited | Information & communication | 2010 |
| Geneen Properties Limited | Real estate | 2015 |
| Genesis NO. 2 Ltd | Other services | 2004 |
| Genesoup Ltd | Professional & scientific | 2016 |
| Geniate Limited | Extraterritorial | 2012 |
| Genous Limited | Professional & scientific | 2022 |
| Gentle Guardian Limited | Financial services | 2023 |
| Genvora Ltd | Wholesale & retail | 2025 |
| George Hobbs Carpentry & Building Ltd | Construction | 2021 |
| George Powell Ltd | Professional & scientific | 2018 |
| George Wiscombe Limited | Professional & scientific | 2011 |
| Gericke Rotaval Ltd | Manufacturing | 1970 |
| GG Contracts Limited | Construction | 2021 |
| GH, VM & RA Pearce Ltd | Agriculture & fishing | 2020 |
| Gibbs Mews (Management) Limited | Real estate | 2012 |
| Gibson Green Ltd | Construction | 2020 |
| Gibson Langley & Associates Limited | Professional & scientific | 2016 |
| Gift of GOD Podcast Ltd | Information & communication | 2025 |
| GIG4 Ltd | Information & communication | 2020 |
| Giles & Dening Holdings Limited | Financial services | 2017 |
| Giles & Dening Limited | Construction | 2002 |
| Giles (South West) Limited | Financial services | 2021 |
| Gillespie Road Communications Limited | Professional & scientific | 2020 |
| Gingernut Coffee Shops Limited | Hospitality | 2025 |
| Giraffe Engineering Ltd | Professional & scientific | 2015 |
| Giving Agency Ltd | Information & communication | 2021 |
| GL Media Ltd | Other services | 2019 |
| Glass Glover Group Limited | Extraterritorial | 1987 |
| Glass Glover Management Services Limited | Extraterritorial | 1963 |
| Glasshouse Design Limited | Wholesale & retail | 2019 |
| Glasslemons Ltd | Hospitality | 2016 |
| Glasspace Group Ltd | Construction | 2020 |
| Glasspace Limited | Construction | 2022 |
| Glenmore Business Park (Chippenham) Management Limited | Real estate | 2003 |
| Glennie Limited | Extraterritorial | 2021 |
| Glideover Limited | Construction | 2005 |
| Global Mapaid Ltd | Information & communication | 2008 |
| Global Timber Limited | Extraterritorial | 2000 |
| Globe Cleaning Contractors Limited | Administrative & support | 2002 |
| Glopeq Limited | Wholesale & retail | 2014 |
| Glowing EYE Games Limited | Information & communication | 2009 |
| Glowkids Limited | Manufacturing | 2011 |
| Glowmie Limited | Other services | 2025 |
| GLS Foodservice Designs Limited | Professional & scientific | 2004 |
| GM Imports Ltd | Wholesale & retail | 2024 |
| GM Locum Services Ltd | Professional & scientific | 2018 |
| GM61 Limited | Professional & scientific | 2017 |
| GMC Fire Consultancy Ltd. | Professional & scientific | 2011 |
| GMD Limited Company Ltd | Wholesale & retail | 2026 |
| Go Slow and Enjoy Limited | Hospitality | 2026 |
| Goatacre Construction Limited | Real estate | 2023 |
| Gold Electrical SW Ltd | Construction | 2024 |
| Golden Bull Software Ltd | Information & communication | 2018 |
| Golden Seed Ltd | Construction | 2026 |
| Goldwing Riders UK Ltd | Other services | 2025 |
| Gomint Services Ltd | Information & communication | 2021 |
| Good Energy Cedar Windfarm Limited | Energy | 2013 |
| Good Energy GAS Limited | Energy | 2005 |
| Good Energy Generation Limited | Energy | 1990 |
| Good Energy Group Limited | Energy | 2000 |
| Good Energy Limited | Energy | 1999 |
| Good Energy Services Limited | Construction | 2022 |
| Good Energy Solar (South West) Limited | Construction | 2014 |
| Good Energy Tidal Limited | Energy | 2013 |
| Good Energy Works Limited | Construction | 2019 |
| Good Food Management Limited | Hospitality | 2022 |
| Goodistokes Limited | Real estate | 2019 |
| Goodman Residential Ltd | Real estate | 2007 |
| Goose & Gander Holdings Ltd | Financial services | 2018 |
| Goose Knights Ltd | Professional & scientific | 2023 |
| Goosewing Ltd | Hospitality | 2008 |
| Gorley Consultancy Limited | Professional & scientific | 2011 |
| Goughees Coffee Ltd | Manufacturing | 2023 |
| Graham & Co. Ltd | Professional & scientific | 2011 |
| Graham Smith (UK) Ltd | Administrative & support | 2003 |
| Graintec Liquid Dosing Systems Limited | Administrative & support | 2018 |
| Granary Draughting Limited | Other services | 2010 |
| Graves Consulting Limited | Administrative & support | 2024 |
| Gray Trading Limited | Financial services | 2021 |
| Grayson Florence Property Ltd | Real estate | 2015 |
| Great Ridgeway Kitchens Ltd | Administrative & support | 2012 |
| Green Gables House Management Company Limited | Households | 1993 |
| Green Ginger Health Limited | Wholesale & retail | 2018 |
| Green Loop Limited | Wholesale & retail | 2020 |
| Green Pioneer Limited | Wholesale & retail | 2008 |
| Green Spa Massage & Wellbeing Limited | Other services | 2023 |
| Green's Mini Plant Hire Ltd | Administrative & support | 2025 |
| Greenacre Gardening Services Ltd | Households | 2019 |
| Greenacre Group Ltd | Financial services | 2019 |
| Greenacre Landscaping Services Ltd | Administrative & support | 2016 |
| Greenacre Limited | Professional & scientific | 1992 |
| Greenacre Property Services SW Ltd | Administrative & support | 2019 |
| Greengrove Construction Limited | Construction | 2013 |