| Greenfields Care Group Ltd | Health & social care | 2003 |
| Greenhaus Holding Limited | Professional & scientific | 2019 |
| Greenheat UK Ltd | Construction | 2009 |
| Greenleaf Private Limited | Hospitality | 2021 |
| Greens Brothers Ltd | Information & communication | 2012 |
| Greensure Environmental Limited | Water & waste | 2017 |
| Greenvak Ltd | Manufacturing | 2026 |
| Greenway Stays Uxbridge Ltd | Hospitality | 2024 |
| Greenwrights Ltd | Administrative & support | 2013 |
| Greso Investments Limited | Real estate | 2026 |
| Grey Matter LAB Ltd | Information & communication | 2023 |
| Greyfield Group Ltd | Administrative & support | 2025 |
| Greyforge Services Ltd | Wholesale & retail | 2026 |
| Greymax Constructions Ltd | Construction | 2023 |
| Greymax Developments Ltd | Construction | 2024 |
| Greymax Investments Ltd | Real estate | 2024 |
| Gridéire Consulting Ltd | Professional & scientific | 2025 |
| Gridéire Holdings Ltd | Financial services | 2026 |
| Gridéire Properties Ltd | Real estate | 2026 |
| Griffin Commercial Limited | Professional & scientific | 2023 |
| Griffiths Court Associates Limited | Households | 2006 |
| Grill Cartel Express Ltd | Hospitality | 2025 |
| Grill Cartel Lounge Ltd | Hospitality | 2024 |
| Grill Rush Limited | Wholesale & retail | 2025 |
| Grimshaw Associates Limited | Professional & scientific | 2005 |
| Grindhouse Post Ltd | Information & communication | 2025 |
| Grocerywala Limited | Wholesale & retail | 2025 |
| Grosvenor (UK) Limited | Real estate | 2005 |
| Grosvenor House Investments Ltd | Real estate | 2017 |
| Grosvenor Square Limited | Financial services | 2014 |
| Group K Broadcasting Limited | Information & communication | 1974 |
| Group of Company's Ltd | Administrative & support | 2023 |
| Group of Trades Ltd | Manufacturing | 2025 |
| Group Two Estate Ltd | Real estate | 2020 |
| Grove Heating Limited | Construction | 2016 |
| Grovelake Estates Ltd | Real estate | 2023 |
| Grovelands Limited | Households | 1985 |
| Grow on Ltd | Real estate | 2016 |
| Growth Grid Agency Limited | Wholesale & retail | 2025 |
| Growth Solution X Ltd | Information & communication | 2024 |
| GRP United Ltd | Wholesale & retail | 2016 |
| GS7 Limited | Real estate | 2025 |
| GSA Limited Liability Partnership | | 2022 |
| GSH Traders Ltd | Wholesale & retail | 2026 |
| GSK Property Investments Ltd | Real estate | 2016 |
| GSM Tennis Academy Limited | Manufacturing | 2020 |
| GSS Transport London Ltd | Transport & logistics | 2026 |
| GST Building Constructions Limited | Construction | 2025 |
| Gstar Agency Ltd | Administrative & support | 2024 |
| GT (Leeds) Lift Limited | Construction | 2004 |
| GT (Leicester) Limited | Construction | 2013 |
| GT (North Tyneside) Limited | Financial services | 2013 |
| GT Camberwell (Holdings) Limited | Professional & scientific | 2009 |
| GT Camberwell Limited | Construction | 2009 |
| GT GAS Services Limited | Other services | 2024 |
| GT International Limited | Administrative & support | 1993 |
| GT Neps (Holdings) Limited | Construction | 2014 |
| GT Neps Limited | Construction | 2014 |
| Gtb.Technologies Limited | Information & communication | 2018 |
| GTD Capital Limited | Other services | 2024 |
| GTS UK Healthcare Ltd | Wholesale & retail | 2012 |
| Guardian Secure Site Limited | Administrative & support | 2006 |
| Guardian Trust Advisory Limited | Financial services | 2023 |
| Guevarra Healthcare Ltd | Health & social care | 2024 |
| Guild 750 Limited | Wholesale & retail | 1949 |
| Guimarisa Limited | Administrative & support | 2023 |
| Gulati Estates Limited | Real estate | 2019 |
| Gulati Investments Ltd | Real estate | 2026 |
| Gulati Real Estates Ltd | Real estate | 2021 |
| Gulf Worldwide Express Ltd | Transport & logistics | 2003 |
| Gullyguys Ltd | Water & waste | 2022 |
| Gurkha Carpet Cleaning Ltd | Administrative & support | 2019 |
| Gurkha Executive Service Ltd | Transport & logistics | 2015 |
| Gurkush Blessings Investment Ltd | Real estate | 2022 |
| Guru Development Ltd | Real estate | 2017 |
| Guru Granth Holdings Ltd | Financial services | 2023 |
| Guru Nanak Investment Ltd | Real estate | 2023 |
| Gurudev Charan Sharan Limited | Professional & scientific | 2024 |
| Gurunanak Housing Development Ltd | Construction | 2025 |
| GVE Detailing Limited | Wholesale & retail | 2019 |
| GVE Export Ltd | Wholesale & retail | 2022 |
| GVE Servicing Limited | Wholesale & retail | 2017 |
| GVG Investment Limited | Real estate | 2024 |
| GW Property Maintenance Services Limited | Households | 2009 |
| GX Driver Hire Limited | Transport & logistics | 2019 |
| GX Homes Ltd | Construction | 2021 |
| GX Numberplates Ltd | Manufacturing | 2020 |
| GX Tax Partners Ltd | Professional & scientific | 2021 |
| GX Vantage Ltd | Education | 2023 |
| GXP Quality Solutions Limited | Health & social care | 2025 |
| Gxre Limited | Professional & scientific | 2019 |
| H & C Luxury Hire Limited | Administrative & support | 2024 |
| H & D Property Limited | Real estate | 2017 |
| H & G Holdings Limited | Professional & scientific | 2002 |
| H & M Global Logistics Ltd | Transport & logistics | 2017 |
| H C Builders Limited | Construction | 2016 |
| H D Trading Ltd | Wholesale & retail | 2022 |
| H R Buttar Construction Ltd | Construction | 2025 |
| H&K(Gb) Ltd | Wholesale & retail | 2024 |
| H.E.E.Y Electrical Ltd | Construction | 2025 |