| Green AGE Estates Limited | Real estate | 2024 |
| Green AGE Estates Ltd Ltd | Real estate | 2024 |
| Green AGE Properties Ltd | Real estate | 2023 |
| Green Box Builds Limited | Administrative & support | 2024 |
| Green Breeze Duct Cleaning Limited | Administrative & support | 2025 |
| Green Decor & Contracting Ltd | Construction | 2016 |
| Green Homes Developments Limited | Construction | 2015 |
| Green Shield Environmental Ltd | Professional & scientific | 2006 |
| Green Valet Limited | Professional & scientific | 2009 |
| Greenacres (Stotfold) Management Company Limited | Households | 2008 |
| Greenman Cambridge Limited | Administrative & support | 2015 |
| Greens Business Services Ltd | Extraterritorial | 2019 |
| Greensands Place Manco Limited | Real estate | 2023 |
| Greenstone Haulage Ltd | Water & waste | 2025 |
| Greg Building Maintenance Limited | Construction | 2022 |
| Greg Building Services Ltd | Construction | 2015 |
| Greg Building Solutions Limited | Construction | 2023 |
| Grenrose Scaffolding Limited | Construction | 1975 |
| Grenventhill Property Limited | Hospitality | 2025 |
| Greydells Ltd | Health & social care | 2017 |
| Greydells Property Ltd | Real estate | 2026 |
| GRF Limited | Professional & scientific | 2023 |
| GRF Services (London) Ltd | Construction | 2019 |
| Grice, Collins, Long Limited | Real estate | 2006 |
| Grieveson Plastering Ltd | Extraterritorial | 2024 |
| Gripping Yarns Ltd | Information & communication | 2017 |
| GRODO2 | Financial services | 2017 |
| Groundsite Residents Management Limited | Households | 1987 |
| Groundwork & Paving Services Limited | Construction | 2015 |
| Group Premier Holding Ltd | Construction | 2024 |
| Groves & Associates Ltd | Real estate | 2022 |
| Groworks Solution Limited | Wholesale & retail | 2024 |
| Growww Limited | Professional & scientific | 2020 |
| Grupo Leisure Ltd | Other services | 2024 |
| Gsdl Consulting Limited | Professional & scientific | 2024 |
| Gsdp Limited | Transport & logistics | 2014 |
| GSH Carpentry Ltd | Manufacturing | 2023 |
| GSJ Hooper Limited | Administrative & support | 2025 |
| GTK Holdings Ltd | Real estate | 2025 |
| GTK Innovations Ltd | Wholesale & retail | 2025 |
| GTS Supplies Ltd | Other services | 2017 |
| Guardian Angels Film Ltd | Information & communication | 2023 |
| Guardian Inheritance Ltd | Professional & scientific | 2009 |
| Gudu Global Solutions Ltd | Information & communication | 2024 |
| Gujarati Christian Fellowship United Kingdom | Other services | 2009 |
| Gulf Trading Ltd | Wholesale & retail | 2024 |
| Gunnells Management Limited | Households | 2015 |
| Guru Paul Limited | Administrative & support | 2024 |
| GUT Friendly Health Ltd | Wholesale & retail | 2026 |
| GVM Mobile Communications Limited | Information & communication | 2002 |
| GW Functional Fitness Ltd | Other services | 2017 |
| GWD Assets Limited | Professional & scientific | 2023 |
| GWE Property Limited | Construction | 2000 |
| Gwill Consult Limited | Professional & scientific | 2016 |
| Gyamfuaa Wilson Ltd | Health & social care | 2024 |
| Gym Mafia Limited | Arts & recreation | 2024 |
| Gyneva Limited | Health & social care | 2025 |
| H & C Mackenzie Limited | Financial services | 2025 |
| H & M Financial Services Limited | Professional & scientific | 2009 |
| H & Y Medical Services Limited | Health & social care | 2025 |
| H a Sherwood Holdings Limited | Financial services | 2023 |
| H and a Hire Ltd | Administrative & support | 2020 |
| H and H Engineering Services Limited | Professional & scientific | 2025 |
| H B Tech Limited | Professional & scientific | 2012 |
| H K F Construction Limited | Construction | 2023 |
| H M B Builders Ltd | Construction | 2019 |
| H Nduka MED Business HG Limited | Construction | 2022 |
| H&B Decor Ltd | Construction | 2022 |
| H&Em Consulting Ltd | Professional & scientific | 2025 |
| H2OCHEM Ltd | Manufacturing | 2024 |
| Habebi Global Ltd | Administrative & support | 2025 |
| Habibi Trip Ltd | Administrative & support | 2024 |
| Hadley AV Limited | Construction | 2019 |
| Hadley James Limited | Wholesale & retail | 2015 |
| Hadley James Property Ltd | Real estate | 2020 |
| Hadley James Services Limited | Wholesale & retail | 2024 |
| Haemostasis UK Ltd | Health & social care | 2025 |
| HAER-2-CARE Ltd | Health & social care | 2021 |
| Hafs London Limited | Health & social care | 2016 |
| Hager-Vor Consulting Limited | Administrative & support | 2024 |
| Haider Systems Ltd | Information & communication | 2021 |
| Hair Craft Ltd | Other services | 2018 |
| Hair Divine Products Limited | Wholesale & retail | 2019 |
| Hakim & Rekha Ltd | Transport & logistics | 2015 |
| Halal Concept Ltd | Wholesale & retail | 2016 |
| Haley Hills Physiotherapy Ltd | Other services | 2025 |
| Hallgrove Management and Investment Ltd | Real estate | 2010 |
| Hallions Limited | Information & communication | 2015 |
| Halliwell Roofing & Building Services Ltd | Construction | 2018 |
| Hamilton Davies LLP | | 2015 |
| Hamilton House Management (Putney) Limited | Households | 1998 |
| Hamilton Luxury Homes Ltd | Real estate | 2024 |
| Hammond Close Management Company Limited | Households | 1977 |
| Hammond COX Casting Limited | Arts & recreation | 2014 |
| Hammond's Electrical Ltd | Energy | 2020 |
| Hammond-Barr Accountants Limited | Professional & scientific | 2009 |
| Hampton House (Hertford Residential Management) Ltd | Households | 2003 |
| Hanan Clothing Ltd | Wholesale & retail | 2019 |
| Hanbury Mews Residents Limited | Administrative & support | 1990 |
| Handyguy Property Maintenance Limited | Construction | 2023 |