| Geometric Advisors UK Limited | Financial services | 2025 |
| George Filipe Properties Ltd | Real estate | 2024 |
| George Worth Ltd | Arts & recreation | 2022 |
| Georgia Developments Wessex Limited | Agriculture & fishing | 1998 |
| GEP Environmental Limited | Professional & scientific | 2004 |
| Germain Consulting Ltd | Information & communication | 2008 |
| Geronimo Holdings Limited | Financial services | 2016 |
| GET My Details Limited | Information & communication | 2023 |
| GET the Cleaning Done Ltd | Administrative & support | 2019 |
| Gfwb Limited | Professional & scientific | 2023 |
| GG Walker Limited | Real estate | 2024 |
| Ggad Group UK Limited | Construction | 2021 |
| Giblook Ltd | Hospitality | 2024 |
| Gibz Limited | Other services | 2006 |
| Gilco Limited | Wholesale & retail | 1981 |
| Gildhouse Holdings Limited | Professional & scientific | 2015 |
| Gildhouse Limited | Real estate | 2005 |
| Giles Taylor Consultancy Services Ltd | Professional & scientific | 2022 |
| Gilkicker Ltd | Construction | 2007 |
| Gillcreighton Ltd | Health & social care | 2018 |
| Gillingham Lakes (Phase 2) Residents Management Company Limited | Households | 2024 |
| Gillings Planning Ltd | Professional & scientific | 2017 |
| Ginge Equine LLP | | 2024 |
| Ginge Holdings Ltd | Financial services | 2024 |
| Ginge Properties Ltd | Real estate | 2025 |
| Ginger & Moss Limited | Wholesale & retail | 2015 |
| Ginger Tiger Limited | Professional & scientific | 2020 |
| GINGER1 Limited | Professional & scientific | 2013 |
| Gioia UK Limited | Manufacturing | 2006 |
| Giorno Limited | Real estate | 2025 |
| Gismo Limited | Real estate | 2018 |
| Giuseppe Manco Limited | Other services | 2020 |
| GJ Charm Ltd | Real estate | 2025 |
| GJ Matthews Ltd | Construction | 2014 |
| Glamour Works Winchester Limited | Other services | 2024 |
| Glamzhairline by OMA Ltd | Other services | 2024 |
| Glass Human Resources Limited | Administrative & support | 2020 |
| Glassy Pictures Limited | Information & communication | 2015 |
| Gleam Luxe Ltd | Administrative & support | 2023 |
| Glenn Morris Academy Limited | Education | 2020 |
| GLK Installations Limited | Construction | 2002 |
| Global Connections Trading (UK) Ltd | Mining & quarrying | 2008 |
| Global Environmental Monitoring (GEM) Limited | Professional & scientific | 2016 |
| Global Graduate Consulting Ltd | Education | 2025 |
| Global Mindset Training Ltd | Education | 2025 |
| Global Security and Risk Services Ltd | Administrative & support | 2013 |
| Global T S E Limited | Manufacturing | 1999 |
| Global Wealth Coach Ltd | Other services | 2023 |
| Glowfern Limited | Construction | 2001 |
| Glum :): Limited | Wholesale & retail | 2022 |
| GM Holiday Lets Limited | Hospitality | 2025 |
| Gmotr Ltd | Public administration | 2026 |
| Gnomic Limited | Professional & scientific | 2024 |
| GNT Digital Limited | Information & communication | 2023 |
| Go 57 Ltd | Transport & logistics | 2017 |
| Go Ludo Limited | Wholesale & retail | 2016 |
| Go Supreme Limited | Administrative & support | 2018 |
| Gobbledegook Communications Limited | Information & communication | 2007 |
| Gobento Tree Ltd | Hospitality | 2024 |
| Godwins Solicitors LLP | | 2011 |
| Goff Investments Limited | Education | 2018 |
| Goji Group Ltd | Wholesale & retail | 2021 |
| Golborne Management Limited | Administrative & support | 2020 |
| Gold and Grey UK Ltd | Wholesale & retail | 2017 |
| Gold Star Recordings Ltd | Information & communication | 2018 |
| Golden Gate Consultancy Ltd | Professional & scientific | 2026 |
| Golden Oasis Days Ltd | Health & social care | 2025 |
| Golding&Co Facility Management Services Ltd | Professional & scientific | 2019 |
| Goldridge Limited | Agriculture & fishing | 1988 |
| Goldring Enterprises Limited | Hospitality | 1995 |
| Good Guys Productions Ltd | Information & communication | 2003 |
| Good People Consulting Ltd | Professional & scientific | 2025 |
| Good Yolk Marketing Ltd | Professional & scientific | 2025 |
| Goodall Barnard Properties Limited | Real estate | 1996 |
| Goodslux Limited | Wholesale & retail | 2025 |
| Goodwin Global Solutions Ltd | Wholesale & retail | 2025 |
| Goody-Goody Ltd | Manufacturing | 2019 |
| Gordon Bloodstock Ltd | Agriculture & fishing | 2021 |
| Gordon Health Consulting Ltd | Professional & scientific | 2025 |
| Gornergrat Advisors Limited | Professional & scientific | 2022 |
| Gorse Limited | Manufacturing | 2017 |
| Gotranslate Limited | Other services | 2016 |
| Gould Game Farming Limited | Agriculture & fishing | 2017 |
| Goulden Properties Limited | Real estate | 1990 |
| Goyoo Infinity Ltd | Hospitality | 2019 |
| GPA Aviation Limited | Education | 2020 |
| GPS Property Holdings Ltd | Households | 2024 |
| GR Techvision Ltd | Professional & scientific | 2019 |
| Gradko International Limited | Manufacturing | 1973 |
| Graeme Lang Limited | Information & communication | 2021 |
| Graham Dragon Enterprises Ltd | Information & communication | 2008 |
| Graham Partners Limited | Other services | 2018 |
| Grahame Smith Development Limited | Professional & scientific | 2012 |
| Grand Gardens Maintenance Ltd | Administrative & support | 2019 |
| Grange Financial Planning Limited | Financial services | 1998 |
| Granville House (Winchester) Management Company Limited | Administrative & support | 2006 |
| Graphile Ltd | Information & communication | 2018 |
| Gray Jewels Limited | Administrative & support | 2011 |
| Gray's Refurbishments Ltd | Construction | 2019 |
| Grease Junkie.Com Limited | Wholesale & retail | 2014 |