| Glenholme Specialist Healthcare (Holdings) Limited | Health & social care | 2021 |
| Glenholme Specialist Healthcare (Northern Region) Limited | Health & social care | 2010 |
| Glenholme Specialist Healthcare (Saltdean) Limited | Real estate | 2022 |
| Glenholme Specialist Healthcare (Southern Region) Limited | Health & social care | 2006 |
| Glhoss UK Ltd | Wholesale & retail | 2015 |
| Global Agile Solutions Ltd | Information & communication | 2025 |
| Global Corporate Services Management Limited | Financial services | 1993 |
| Global Engineering & Trading Ltd | Construction | 2025 |
| Global Expat PAY Limited | Information & communication | 2019 |
| Global Link Private Ltd | Education | 2026 |
| Global OIL Solution Limited | Wholesale & retail | 2026 |
| Global QA Limited | Administrative & support | 2005 |
| Globalateral Limited | Administrative & support | 2016 |
| Globe House Management Co. Ltd | Households | 2006 |
| Globe Marine Ltd | Professional & scientific | 2024 |
| GLX Industrial Ltd | Professional & scientific | 2023 |
| GM Auto Sales Ltd | Wholesale & retail | 2025 |
| GM Style Limited | Information & communication | 2023 |
| GN Rail Signalling Consultancy Limited | Construction | 2025 |
| GNE Properties Limited | Real estate | 2025 |
| Gnomi Tech Ltd | Financial services | 2013 |
| Go Roofing & Building Ltd | Construction | 2025 |
| GOA Property Management Ltd | Real estate | 2025 |
| GOD Save the Clean - Property Turnovers Ltd | Administrative & support | 2026 |
| GOD Save the Clean Ltd | Administrative & support | 2024 |
| Gogo's Limited | Hospitality | 2007 |
| Gogo's Waterfront Ltd | Hospitality | 2012 |
| Gogos Holdings Ltd | Financial services | 2017 |
| Goji Business Consultancy Limited | Administrative & support | 2014 |
| Golborne RD Ltd | Real estate | 2024 |
| Goldays Limited | Real estate | 2001 |
| Golden Cascade Capital Advisors Limited | Financial services | 2023 |
| Golden Curry Inn Ltd | Hospitality | 2025 |
| Golden Curry SA Ltd | Hospitality | 2024 |
| Golden Gate Investment Ltd | Real estate | 2014 |
| Golden Shares Ltd | Financial services | 2024 |
| Goldenchoice Limited | Hospitality | 1993 |
| Goldplace Limited | Households | 1980 |
| Good Chance Ltd | Real estate | 2024 |
| Good Day Cafe Limited | Hospitality | 2018 |
| Good Sweat Sauna Ltd | Health & social care | 2024 |
| Good Vibes Only Products Limited | Wholesale & retail | 2023 |
| Goodpixels Ltd | Information & communication | 2026 |
| Goose Acre Residents Association Limited | Households | 1982 |
| Gorslar Heath Limited | Real estate | 2012 |
| Goslar Management Company Limited | Households | 2004 |
| Gospel Heights Freehold Ltd | Real estate | 2026 |
| Gourmet Grill Fast Food Limited | Hospitality | 2016 |
| Gourmet Tang Limited | Hospitality | 2017 |
| GP Computers Limited | Other services | 2011 |
| GP Property MDX Ltd | Construction | 2021 |
| Gpms Consulting Limited | Professional & scientific | 2019 |
| Graham Gardening & Maintenance Ltd | Administrative & support | 2025 |
| Grand Central Glasgow Hotel Opco Limited | Hospitality | 2018 |
| Grand Regency Heights (Ascot) Management Company Limited | Households | 2001 |
| Grateful Lemon Ltd | Professional & scientific | 2022 |
| Gravitee Ltd | Wholesale & retail | 2023 |
| Grays Plant Limited | Professional & scientific | 2025 |
| Great Barber Ltd | Other services | 2023 |
| Great British Gifts Ltd | Wholesale & retail | 2023 |
| Great Glass Limited | Construction | 2018 |
| Great Maytham Hall Management Limited | Households | 2004 |
| Great Oaks Residents Association Limited | Households | 1988 |
| Green Box First AID Training Limited | Education | 2018 |
| Green Brothers Removals & Storage Ltd | Extraterritorial | 2013 |
| Green Bumblebee Ltd | Professional & scientific | 2011 |
| Green Cedars Property Limited | Construction | 2020 |
| Green Class Services Limited | Administrative & support | 2012 |
| Green Elephant Recruitment Limited | Administrative & support | 2015 |
| Green Space Studios Ltd | Construction | 2022 |
| Greenacre Residents' Association Limited(The) | Households | 1961 |
| Greenfield Close Residential Home Limited | Health & social care | 2002 |
| Greenfield Opportunities Limited | Professional & scientific | 2021 |
| Greensail Limited | Professional & scientific | 2026 |
| Greensword Limited | Real estate | 2023 |
| Greenwood Tree Surgeons Limited | Agriculture & fishing | 2012 |
| Gremimi Ltd | Information & communication | 2017 |
| Grendel Investments Limited | Financial services | 2004 |
| Grendon Residents Limited | Real estate | 2000 |
| Grenfell Park (Taplow) Management Company Limited | Households | 2012 |
| Gressmann Gallery Ltd | Wholesale & retail | 2025 |
| Grewal Jhans Ltd | Real estate | 2021 |
| Grey Tree Estates Ltd | Construction | 2021 |
| Greywall Estates Limited | Real estate | 2016 |
| Greywall LP | | 2016 |
| Ground 0ERO Limited | Construction | 2012 |
| Ground Bass Limited | Information & communication | 2016 |
| Ground Force Landscaping (Berkshire) Limited | Administrative & support | 2021 |
| Ground Logic Limited | Information & communication | 2026 |
| Ground One Limited | Transport & logistics | 2007 |
| Growing Digital Ltd | Professional & scientific | 2022 |
| Growituk Ltd | Wholesale & retail | 2019 |
| Growth Mindset Consulting Ltd | Information & communication | 2018 |
| Growthsphere Ltd | Other services | 2024 |
| GRS International (QS) Limited | Professional & scientific | 2021 |
| GRS International Limited | Financial services | 2019 |
| GRV Group Ltd | Construction | 2024 |
| GSR Marine Consultants Limited | Professional & scientific | 2008 |
| GTR Food Ltd | Wholesale & retail | 2025 |
| Guam (UK) Limited | Wholesale & retail | 2005 |