| Gfxh Properties Limited | Real estate | 1933 |
| GG Investments Holdings Limited | Real estate | 2023 |
| GG Investments SPV I Limited | Real estate | 2023 |
| GG-003-956 Limited | Real estate | 2023 |
| GG-100-182 Limited | Real estate | 2023 |
| Gggtrans Ltd | Transport & logistics | 2025 |
| GGP Consultancy Limited | Administrative & support | 2016 |
| Ggres Trans Ltd | Transport & logistics | 2016 |
| Ghadeer Limited | Information & communication | 2022 |
| Ghanaba Services Ltd | Administrative & support | 2026 |
| Gharib International Food Centre Ltd | Wholesale & retail | 2025 |
| Ghaz Tech Ltd | Wholesale & retail | 2025 |
| GHD Hair & Beauty Ltd | Other services | 2026 |
| GHD Property Services & Maintenance Ltd | Construction | 2022 |
| GHD Trust | Extraterritorial | 2015 |
| Gheartshop Co., Ltd | Extraterritorial | 2019 |
| Ghedirect Ltd | Agriculture & fishing | 2002 |
| Gherman Construction Limited | Construction | 2018 |
| Ghibee Holdings Ltd | Real estate | 2025 |
| GHK Futures Limited | Real estate | 2022 |
| Ghost Vehicle Security Ltd | Wholesale & retail | 2025 |
| Ghoustrader Ltd | Wholesale & retail | 2024 |
| GI Group 26 Ltd | Hospitality | 2019 |
| GIA 2023 Properties Limited | Real estate | 2023 |
| Gianbi Limited | Information & communication | 1989 |
| Gianni Lorry & CAB Limited | Transport & logistics | 2023 |
| Giant Peach Design Ltd | Information & communication | 2004 |
| Gibbs Creative Solutions Ltd | Professional & scientific | 2025 |
| Gibraltar House Residents Limited | Households | 2006 |
| Gibson Andrews (MK) Limited | Wholesale & retail | 2002 |
| GIC Group Limited | Professional & scientific | 2018 |
| GIC Medical UK Ltd | Health & social care | 2011 |
| Gica Juravle Ltd | Administrative & support | 2016 |
| Gidley Consulting Limited | Information & communication | 2015 |
| Giesecke+Devrient Currency Technology GB Ltd | Professional & scientific | 2002 |
| Giesecke+Devrient Epayments UK Ltd | Manufacturing | 1997 |
| Giesecke+Devrient Mobile Security TCD UK Limited | Manufacturing | 2022 |
| GIF Services Ltd | Transport & logistics | 2023 |
| Giffard Park Cafe Ltd | Hospitality | 2020 |
| Giffard Support Services Limited | Administrative & support | 2023 |
| Gift Guru Moments Limited | Wholesale & retail | 2024 |
| Gift of Learning Ltd | Extraterritorial | 2021 |
| Giga PC Limited | Wholesale & retail | 2025 |
| Gigatt Project and Engineering Consulting Limited | Other services | 2019 |
| Gigatt Property Consulting Ltd | Real estate | 2019 |
| Gigatten Consulting Ltd | Professional & scientific | 2022 |
| Gigglewater Productions Ltd | Wholesale & retail | 2017 |
| Gilberts Kosher Foods Limited | Manufacturing | 1995 |
| Gill Building Solutions Ltd | Construction | 2022 |
| Gill Electrical Ltd | Construction | 2014 |
| Gill Global Retail Ltd | Wholesale & retail | 2025 |
| Gill Transport Ltd | Transport & logistics | 2018 |
| Gillani Contract Ltd | Information & communication | 2026 |
| Gilli.Es Digital Innovation Ltd | Information & communication | 2026 |
| Gillibrand Holdings Limited | Financial services | 2023 |
| Gills Transport MK Ltd | Transport & logistics | 2018 |
| Gilo Industries Group Limited | Financial services | 2012 |
| Gilt Swan Buckingham Limited | Wholesale & retail | 2014 |
| Giltquest Limited | Real estate | 1991 |
| Gimle Ltd | Transport & logistics | 2024 |
| Gimme Shelter Marquees Ltd | Administrative & support | 2021 |
| Gina Curtis Radio Control Ltd | Wholesale & retail | 2022 |
| Ginger Finance Limited | Professional & scientific | 2022 |
| Ginger RAY Limited | Wholesale & retail | 2023 |
| Giomakay Investments Ltd | Real estate | 2023 |
| Giraffe Ltd | Information & communication | 2015 |
| Girls in Science Ltd | Education | 2019 |
| Girnari Homes Limited | Real estate | 2024 |
| GIS Recruiter Ltd | Administrative & support | 2020 |
| Giska Ltd | Transport & logistics | 2014 |
| Gitari's Logistics Limited | Transport & logistics | 2017 |
| Giuseppe's Pizzeria Ltd | Hospitality | 2018 |
| Give Back 2U UK Community Interest Company | Education | 2018 |
| Giveark Services Ltd | Information & communication | 2021 |
| Giwa Records Ltd | Information & communication | 2016 |
| Gizaz Ltd | Transport & logistics | 2025 |
| GJ Tech Solutions Ltd | Professional & scientific | 2025 |
| GJ03 Limited | Other services | 2023 |
| Gjana Property Services Limited | Administrative & support | 2024 |
| GJP Estates Limited | Real estate | 2019 |
| GJP Management Ltd. | Administrative & support | 2017 |
| Gjpodeng Ltd. | Wholesale & retail | 2025 |
| Gjpohuang Ltd | Wholesale & retail | 2025 |
| Gjpowang Ltd | Wholesale & retail | 2025 |
| GJR Private Ltd | Wholesale & retail | 2023 |
| GJW Agriculture Limited | Agriculture & fishing | 2015 |
| GK Sports Ltd | Education | 2025 |
| Gkre Ltd | Real estate | 2024 |
| GKV Enterprises Ltd | Information & communication | 2017 |
| Gladkof Properties Ltd | Real estate | 2024 |
| Gladstone Court Limited | Households | 1996 |
| Gladys Cleaning Services Ltd | Administrative & support | 2026 |
| Glaisyers LLP | | 2005 |
| Glamour Addiction Ltd | Wholesale & retail | 2023 |
| Glamourize Ltd | Other services | 2018 |
| Glarco Limited | Professional & scientific | 2025 |
| Glass Face Solutions Ltd | Construction | 2018 |
| Glavier Estates Limited | Real estate | 2025 |
| Glazing Nationwide Ltd | Construction | 2006 |
| GLC Beauty Lounge Limited | Administrative & support | 2020 |