| Grand Designs Landscaping Ltd | Administrative & support | 2025 |
| Grand Horeca Trading Ltd | Wholesale & retail | 2025 |
| Grand Security & Protection Ltd | Administrative & support | 2023 |
| Gratom Property Services Ltd | Real estate | 2025 |
| Grays Travel Limited | Administrative & support | 2021 |
| GRB Construction Ltd | Construction | 2017 |
| GRB Transport Ltd | Transport & logistics | 2026 |
| Great Commission Ministries | Other services | 2009 |
| Great Lakes Resources Ltd | Hospitality | 2021 |
| Great Solutions Accounting Ltd | Professional & scientific | 2026 |
| Greater London Roofing Contractors Ltd | Construction | 2024 |
| Green Arrows Consulting Ltd | Extraterritorial | 2023 |
| Green Meadow Group Ltd | Real estate | 2019 |
| Green Olive Foods & Restaurant Ltd | Hospitality | 2021 |
| Green Open Estates Limited | Real estate | 2026 |
| Green Properties London Ltd | Real estate | 2020 |
| Green Shoots Healthcare Ltd | Health & social care | 2023 |
| Green Star Financial Limited | Professional & scientific | 2018 |
| Green Tide U Ltd | Construction | 2024 |
| Green Windmill International Ltd | Wholesale & retail | 2025 |
| Greenfield Akudi UK Ltd | Construction | 2010 |
| Greengrantsuk Limited | Professional & scientific | 2020 |
| Greenlance Limited | Wholesale & retail | 2021 |
| Greenleaf Real Estate Limited | Real estate | 2021 |
| Greenstar Services Ltd | Administrative & support | 2021 |
| Greenstone Trading Ltd | Financial services | 2025 |
| Greenwich Bay Limited | Wholesale & retail | 2013 |
| Greg Construction (London) Limited | Construction | 2019 |
| Gregory Demolition Limited | Construction | 1985 |
| Greptech UK Ltd | Wholesale & retail | 2019 |
| Gridline Flooring Ltd | Construction | 2017 |
| Gridline Group Ltd | Construction | 2019 |
| Gridline Interiors Ltd | Construction | 2023 |
| Gridline Investments Ltd | Financial services | 2021 |
| Gridline Property Investments Ltd | Real estate | 2022 |
| Gridlining Ltd | Construction | 2020 |
| Grill'Ish Ltd | Hospitality | 2018 |
| Grimi Utilities Ltd | Construction | 2022 |
| Gripline Tyre Centre Ltd | Wholesale & retail | 2026 |
| Grizzlys Barking Ltd | Hospitality | 2025 |
| Grizzlys Penge Ltd | Hospitality | 2025 |
| Groomnoir Ltd | Wholesale & retail | 2016 |
| Grosvenor (BBP01) Limited | Real estate | 2012 |
| Ground Opening Limited | Construction | 2019 |
| Ground UP Homes Ltd | Construction | 2025 |
| Groundform Piling Ltd | Construction | 2020 |
| Groundworks Direct (Southern) Ltd | Construction | 2018 |
| Groupup Ltd | Information & communication | 2019 |
| Groza Construction Ltd | Construction | 2025 |
| Grub Club Barking Limited | Hospitality | 2025 |
| Grupo Moreno Ltd | Construction | 2026 |
| GS General Construct Ltd | Construction | 2022 |
| GS3 Ltd | Administrative & support | 2025 |
| Gsinghr Ltd | Construction | 2026 |
| GSK Housing Ltd | Real estate | 2023 |
| Gtcg Limited | Information & communication | 2016 |
| Gtib Construction Ltd | Construction | 2026 |
| Guaranteed Protection Security Limited | Administrative & support | 2019 |
| Guardex Security Solutions Ltd | Administrative & support | 2025 |
| GUARDIA360 Ltd | Information & communication | 2026 |
| Guardian Hawk Security Ltd | Administrative & support | 2020 |
| Guardtrack Limited | Information & communication | 2017 |
| Guebre Ltd | Transport & logistics | 2021 |
| Gultek Limited | Wholesale & retail | 2010 |
| Gurguta Limited | Financial services | 2018 |
| Gurus Design Limited | Wholesale & retail | 2012 |
| GW Rising Ltd | Professional & scientific | 2019 |
| GW Software Services Limited | Information & communication | 2013 |
| Gwelle Properties Ltd | Real estate | 2019 |
| Gwion Care Ltd | Health & social care | 2024 |
| GWM Platform Ltd | Information & communication | 2022 |
| GZH 381 Ltd | Wholesale & retail | 2026 |
| H & S Accountancy Ltd | Professional & scientific | 2015 |
| H K & Sons Limited | Wholesale & retail | 2010 |
| H T Cafe London Ltd | Hospitality | 2023 |
| H&A Store Ltd | Wholesale & retail | 2020 |
| H&H Suppliers Ltd | Wholesale & retail | 2023 |
| H&H UK Accommodations Ltd | Households | 2022 |
| H&R Clothing Ltd | Wholesale & retail | 2019 |
| H&Y Enterprise Ltd | Real estate | 2024 |
| H.B.M Integrated Services Limited | Administrative & support | 2013 |
| H.K Property Limited | Real estate | 2016 |
| H.T. (Snacks) Ltd | Hospitality | 2005 |
| H1 Services Ltd | Manufacturing | 2019 |
| H8DOF Limited | Administrative & support | 2023 |
| HA & LA Property Ltd | Real estate | 2026 |
| Habib & Son's Construction Ltd | Construction | 2026 |
| Habibi Events Ltd | Wholesale & retail | 2023 |
| Habibi Halal Meat Ltd | Wholesale & retail | 2025 |
| Habitat Holdings Ltd | Real estate | 2019 |
| Habokad Ltd | Construction | 2022 |
| Haemogoblin Games Ltd | Information & communication | 2024 |
| Haide Zemra Ltd | Hospitality | 2025 |
| Haiducii Express Ltd | Manufacturing | 2025 |
| Haig House Limited | Real estate | 2021 |
| Hainault Home Ltd | Real estate | 2024 |
| Hair by Saima Limited | Other services | 2024 |
| Hair Flex Ltd | Other services | 2023 |
| Hairstarway Ltd | Wholesale & retail | 2026 |
| HAJ Estates Limited | Real estate | 2021 |