| Graphex Systems Limited | Real estate | 1987 |
| Graphic Trend (Holdings)Limited | Financial services | 1971 |
| Graphix Studio Ltd | Information & communication | 2018 |
| Graphyte Building Services Ltd | Professional & scientific | 2014 |
| Graviton Media Ltd | Information & communication | 2011 |
| Graystar Management Ltd | Financial services | 2017 |
| Graystone Building Services Group Ltd | Construction | 2023 |
| Graystone Building Services Holdings Ltd | Construction | 2022 |
| Graystone Building Services Limited | Construction | 2002 |
| Great Internet Limited | Information & communication | 2020 |
| Great Northern Hotel (UK) Ltd | Hospitality | 2009 |
| Great Oxford Capital Limited | Professional & scientific | 2013 |
| Great Ventures Ltd | Wholesale & retail | 2021 |
| Greatbatch Holdings Limited | Professional & scientific | 2024 |
| Greater London Towing Limited | Wholesale & retail | 2016 |
| Grecian Holidays Ltd | Administrative & support | 2017 |
| Grecian Marbles (Marmor) Limited | Mining & quarrying | 1911 |
| Greegivil Investments Limited | Real estate | 1958 |
| Greek Art Bakery Ltd | Hospitality | 2024 |
| Green Beaker Limited | Real estate | 2001 |
| Green Clean IP Ltd | Administrative & support | 2024 |
| Green Clean Waste Limited | Water & waste | 2026 |
| Green Commodities Consultants Limited | Wholesale & retail | 2023 |
| Green Cube Ltd | Real estate | 2024 |
| Green Curry Ltd | Hospitality | 2020 |
| Green Decor Limited | Construction | 2008 |
| Green Elephant Cleaning Ltd | Administrative & support | 2023 |
| Green Force Solutions Limited | Administrative & support | 2022 |
| Green Hill Technology Ltd | Manufacturing | 2022 |
| Green IQ Limited | Administrative & support | 2017 |
| Green Lane Properties London Ltd | Real estate | 2018 |
| Green Light Consultancy Group Limited | Administrative & support | 2019 |
| Greenacity Ltd | Information & communication | 2026 |
| Greenacres (New Barnet) Freehold Limited | Households | 2007 |
| Greenbed Ltd | Real estate | 2022 |
| Greendale 1-12B RTM Company Limited | Households | 2020 |
| Greendale 13-15 RTM Company Limited | Households | 2020 |
| Greene Forensic Services Limited | Professional & scientific | 2013 |
| Greenerfyme Limited | Wholesale & retail | 2018 |
| Greenfield Property Management Limited | Professional & scientific | 2003 |
| Greenfox Car Sales Ltd | Wholesale & retail | 2017 |
| Greenfox Recovery Ltd | Administrative & support | 2024 |
| Greengo Limited | Extraterritorial | 2010 |
| Greenhut Investments Limited | Real estate | 2024 |
| Greenland London Holding Ltd | Real estate | 2023 |
| Greenleaf Cleaning London Limited | Administrative & support | 2016 |
| Greenleaf Cleaning Ltd | Administrative & support | 2010 |
| Greenleaf Contract Cleaning Limited | Administrative & support | 2013 |
| Greenpharm Ltd | Wholesale & retail | 2019 |
| Greenpoint Services Limited | Construction | 2018 |
| Greentask Contracts Ltd. | Administrative & support | 1993 |
| Greentask Recruitment Services Ltd | Administrative & support | 2020 |
| Greentecai Limited | Wholesale & retail | 2022 |
| Greenway Builders Ltd | Construction | 2005 |
| Greenwell Management Ltd. | Professional & scientific | 2018 |
| Greenwitch Gardening Ltd | Administrative & support | 2021 |
| Gregora Limited | Real estate | 2022 |
| Gregory’S Landscaping Ltd | Administrative & support | 2023 |
| Greshamen Properties Ltd | Real estate | 2013 |
| Grey FIN Limited | Administrative & support | 2014 |
| Grey LANE12 Ltd | Professional & scientific | 2017 |
| Grey Legal Consulting Limited | Professional & scientific | 2016 |
| Greydorf Services Limited | Administrative & support | 2016 |
| Greymore Limited | Hospitality | 1999 |
| Greysands Management Ltd | Information & communication | 2023 |
| Greyson Property Ltd | Real estate | 2023 |
| GRI Services Ltd | Professional & scientific | 2004 |
| Grid Line Foundations Limited | Construction | 1971 |
| Gridline Plant Hire Limited | Construction | 2010 |
| Griffin Professional Services Limited | Professional & scientific | 2016 |
| Grime IS Alive Limited | Wholesale & retail | 2025 |
| Grinny Pigs Ltd | Manufacturing | 2019 |
| Grippy Media Solutions Limited | Information & communication | 2015 |
| Grocers Choice Ltd | Wholesale & retail | 2025 |
| Ground Sun Group Ltd | Construction | 2018 |
| Ground Sun Ltd | Construction | 2004 |
| Group Cleaning Ltd | Administrative & support | 2011 |
| Grove Place Residents Association (Hatfield) Limited | Households | 1990 |
| Grovelands Business Services Limited | Professional & scientific | 2007 |
| Grovelands Road Management Company (NO. 2) Limited | Households | 1996 |
| Grow Virtual Limited | Administrative & support | 2013 |
| Growth Property Holdings Ltd | Real estate | 2022 |
| Grrr Consulting Limited | Information & communication | 2024 |
| GRS Capital Partners Limited | Financial services | 2016 |
| GS5.SYSTEMS Ltd | Administrative & support | 2024 |
| Gsar Properties Limited | Real estate | 2021 |
| Gsar Self Storage Ltd | Real estate | 2022 |
| GSC Properties Holdings Ltd | Real estate | 2026 |
| Gsgolf Coaching Ltd | Arts & recreation | 2024 |
| GSL Watford Limited | Administrative & support | 2021 |
| Gspt Limited | Administrative & support | 2018 |
| GSR Property Investments Ltd | Administrative & support | 2002 |
| GSS Estates Ltd | Real estate | 2021 |
| GSZ Accounting Limited | Professional & scientific | 2011 |
| GSZ Secretaries Limited | Administrative & support | 2014 |
| GTA Systems Consulting Ltd | Information & communication | 2020 |
| Gtec Media Ltd | Information & communication | 2013 |
| Guardian Selection Limited | Administrative & support | 2000 |
| Guest Developments Limited | Real estate | 2001 |
| Guide Concierge Ltd | Information & communication | 2024 |