| Fruco PLC | Wholesale & retail | 1975 |
| Fugitive Music Limited | Information & communication | 1988 |
| Fullergroom Building Services Ltd | Construction | 2019 |
| Fundamentality Ltd | Wholesale & retail | 2024 |
| Furness Securities Limited | Financial services | 1996 |
| Future Focus Analytics Limited | Information & communication | 2024 |
| G Brooks Design Limited | Administrative & support | 2018 |
| G J Molineux Ltd | Construction | 2006 |
| G Tech Building Services Ltd | Construction | 2006 |
| G. & S. Atkin Limited | Professional & scientific | 1996 |
| G. Lights Limited | Administrative & support | 2005 |
| Galicia Restaurant Ltd | Hospitality | 2012 |
| Gallery Day Spa Limited | Other services | 2019 |
| Gamewagon Holdings Ltd | Professional & scientific | 2012 |
| Gamewagon Ltd | Arts & recreation | 2012 |
| Gardenproud Limited | Other services | 2007 |
| Gardiner Clark Limited | Professional & scientific | 2006 |
| Gazclean Construction Services Limited | Construction | 2025 |
| GBS Accounting Services Limited | Professional & scientific | 2014 |
| Gcse Motors Limited | Wholesale & retail | 2011 |
| Gemini Building Solutions Ltd | Construction | 2021 |
| George Farrer Ltd | Wholesale & retail | 2024 |
| George Sands and Company Limited | Extraterritorial | 1934 |
| GET IT Done Waste Recycling Groundwork & Landscaping Ltd | Administrative & support | 2020 |
| GET UP and Glow Group Ltd | Education | 2025 |
| Gezer Barber Ltd | Other services | 2021 |
| Gezsar Coffee Co. Ltd | Hospitality | 2025 |
| GF IT Consultancy Services Ltd | Information & communication | 2024 |
| Ghyll Limited | Real estate | 2026 |
| Ghyll Park Equestrian Ltd | Agriculture & fishing | 2017 |
| Giclees & Co Studio Ltd | Professional & scientific | 2025 |
| Giggley Limited | Professional & scientific | 1996 |
| Gilder Wellness Ltd | Health & social care | 2023 |
| Gimbles Tree Works Limited | Administrative & support | 2025 |
| GIN Ginnery Ltd | Manufacturing | 2024 |
| Gled Properties Ltd | Real estate | 2019 |
| Glen Coward Carpets Limited | Wholesale & retail | 2004 |
| Glittershed Ltd | Wholesale & retail | 2025 |
| Global Business Ideas Limited | Real estate | 2025 |
| Glorious Bicycles Ltd | Wholesale & retail | 2018 |
| Glow Accounts Ltd | Professional & scientific | 2013 |
| GLP Films Limited | Information & communication | 2003 |
| GLS Projects Ltd | Construction | 2019 |
| GMG Educational Support (UK) Limited | Education | 2001 |
| Go Wild at the Warren Ltd | Arts & recreation | 2025 |
| Golden Decade Limited | Administrative & support | 2010 |
| Golden Tree Agencies Ltd | Real estate | 2024 |
| Golf Trolley Repairs U.K. Ltd | Manufacturing | 2022 |
| Gone Ground Landscapes and Skips Limited | Administrative & support | 2025 |
| Goodboy Joey Films Limited | Administrative & support | 2005 |
| Goodchild Consulting Ltd | Information & communication | 2025 |
| Gorsedene Close Management Company Limited | Real estate | 2012 |
| Goulden Construction Limited | Construction | 2021 |
| GOW Systems Limited | Administrative & support | 2019 |
| GP Fortis Cleaning Services Ltd | Administrative & support | 2024 |
| GPB Installations Ltd | Construction | 2014 |
| Grafty Forklifts Limited | Transport & logistics | 2010 |
| Graham Packham Joinery Ltd | Manufacturing | 2011 |
| Graw Investments Limited | Real estate | 2018 |
| Grays Building Consultants Limited | Professional & scientific | 2010 |
| Gray`S Carpenters & Decorators Limited | Construction | 2009 |
| Green Deer Gardening Ltd | Administrative & support | 2026 |
| Green Electricity Limited | Financial services | 2013 |
| Green Hippo Property Management Ltd | Construction | 2018 |
| Green Label Initiative Ltd | Wholesale & retail | 2025 |
| Green Life Holdings Limited | Financial services | 2016 |
| Greenstone Financial Planning Limited | Professional & scientific | 2015 |
| Greyzone Capital Partners Limited | Professional & scientific | 2024 |
| Grid 17 Ltd | Information & communication | 2025 |
| Griffin People Ltd | Administrative & support | 2011 |
| Grjs Property Management Limited | Real estate | 2002 |
| Grosvenor Benefits Consultants Limited | Professional & scientific | 2002 |
| Groundcare Sales & Marketing Solutions Ltd | Wholesale & retail | 2013 |
| GS Cloud Services Ltd | Information & communication | 2025 |
| GWH Investments Limited | Construction | 2017 |
| H a G Accounting Services Limited | Professional & scientific | 2013 |
| H L F Consultancy Limited | Professional & scientific | 2013 |
| Haaraa UK Limited | Wholesale & retail | 2016 |
| HAB Maintenance Limited | Construction | 2025 |
| Hamish Property Limited | Real estate | 2024 |
| Hammonds Accountancy & Payroll Services Ltd | Professional & scientific | 2019 |
| Hanget Limited | Wholesale & retail | 2022 |
| Hansen Marketing Limited | Wholesale & retail | 1993 |
| Happy Anniversary Limited | Professional & scientific | 2012 |
| Harding & Hewstone Ltd | Wholesale & retail | 2026 |
| Harecombe Manor Properties Ltd | Real estate | 2017 |
| Harecombe Rise Residents Company Limited | Households | 1987 |
| Hares Plastering Limited | Construction | 2015 |
| Harlequin Accounting Services Limited | Professional & scientific | 2007 |
| Harlequin Joinery Limited | Construction | 2012 |
| Harlequin Property Investments Ltd | Real estate | 2026 |
| Harthall Acres Ltd | Construction | 2022 |
| Hashemloo Balaie Ltd | Health & social care | 2020 |
| Hatz Properties Ltd | Financial services | 2011 |
| Hayven Solutions Ltd | Information & communication | 2026 |
| Hazel Recruitments UK Ltd | Administrative & support | 2019 |
| Hbbm Ltd | Professional & scientific | 1977 |
| Heartwood Holdings Limited | Financial services | 2019 |
| Helios Treatments Ltd | Other services | 2025 |
| Hendra Farm Limited | Professional & scientific | 2000 |