| Flock Festivals Limited | Information & communication | 2011 |
| Flooring Inspector Ltd | Professional & scientific | 2025 |
| Flooring Restoration Services Ltd | Construction | 2020 |
| Flush Plumbers Ltd | Construction | 2023 |
| Fluture Solutions Limited | Information & communication | 2004 |
| Folks Services Ltd | Wholesale & retail | 2019 |
| Foodwise (TLC) Limited | Hospitality | 2015 |
| Fortis Regulatory Consultants Limited | Professional & scientific | 2019 |
| Fortune Wolfe Partners Ltd | Professional & scientific | 2025 |
| Foundtime Ltd | Information & communication | 2025 |
| Fractional Team Ltd | Professional & scientific | 2023 |
| Franklin Park (Stevenage) Residents Management Company Limited | Households | 2021 |
| Fraze Communications Limited | Other services | 2019 |
| Freasdail Energy Limited | Energy | 2015 |
| Fred & Ginger Coffee Ltd | Hospitality | 2013 |
| Freedom Capital Investment Partners Limited | Real estate | 2014 |
| French Farm Limited | Energy | 2010 |
| Friarswood Flats Management Company Ltd | Households | 2021 |
| Fritz 2025 Limited | Arts & recreation | 2025 |
| Frozone Ltd | Construction | 2025 |
| Full View Research Ltd | Administrative & support | 2017 |
| Fundamentally Dance Ltd | Arts & recreation | 2024 |
| Fusion Alliance Limited | Real estate | 2008 |
| Future Fire and Voice Ltd | Public administration | 2023 |
| Futurelink Accountancy Services Limited | Professional & scientific | 2004 |
| Futurelink Accountancy Solutions Limited | Professional & scientific | 2020 |
| Futurelink CIS Limited | Administrative & support | 2010 |
| Futurelink Executive Services Limited | Administrative & support | 2019 |
| Futurelink Group Limited | Professional & scientific | 2007 |
| Futurelink Resource Management Services Limited | Administrative & support | 2000 |
| Fwss Investments Limited | Real estate | 2017 |
| G D Barnard Limited | Wholesale & retail | 2002 |
| G.A.N. Financial Solutions Limited | Administrative & support | 2004 |
| G.B. Rigging Limited | Information & communication | 2011 |
| G.E. Allenby Limited | Real estate | 2014 |
| Garden Living Spaces Ltd | Wholesale & retail | 2025 |
| Gardener & Basson Limited | Health & social care | 1948 |
| Garreg Lwyd Energy Limited | Administrative & support | 2012 |
| Gaskin & Davis Limited | Construction | 1961 |
| Gaudhana Enterprises Ltd | Hospitality | 2024 |
| GB Essential Products Ltd | Wholesale & retail | 2020 |
| GDS Partners Limited | Administrative & support | 2025 |
| Geco Consultancy Ltd | Information & communication | 2020 |
| Gelliwern Holdings Limited | Professional & scientific | 2015 |
| Gelliwern Solar Limited | Energy | 2012 |
| Genesis Data Services Ltd | Information & communication | 2026 |
| George GR Limited | Construction | 2021 |
| Geraldine Ingham Consulting Ltd | Professional & scientific | 2025 |
| German Autowerks Ltd | Wholesale & retail | 2022 |
| Gerrard Developments Limited | Real estate | 2013 |
| GETTING1CONNECTED Ltd | Information & communication | 2025 |
| GI Brown Consulting Ltd | Professional & scientific | 2020 |
| Gianco Limited | Wholesale & retail | 2008 |
| GIB Sustainability Limited | Professional & scientific | 2026 |
| Giftt Technology Ltd | Information & communication | 2021 |
| Gild & Glow Limited | Wholesale & retail | 2025 |
| Gill Kelly Counselling Limited | Health & social care | 2017 |
| Gladstone Wealth Ltd | Professional & scientific | 2019 |
| Glandore Homes Limited | Construction | 2020 |
| Glandore London Limited | Construction | 2014 |
| Glass Hammer Limited | Professional & scientific | 2023 |
| Glenchamber Wind Energy Limited | Energy | 2014 |
| Glendhu Bay Consulting Ltd | Professional & scientific | 2018 |
| Glenfinnan Capital Limited | Financial services | 2025 |
| Glens of Foudland Wind Farm Limited | Energy | 2002 |
| Glitz Glitter Ltd | Wholesale & retail | 2010 |
| Gnet Properties Limited | Real estate | 2021 |
| Go Footy Travel Ltd | Administrative & support | 2025 |
| Goodwin (Redbourn) Limited | Construction | 2014 |
| Goonhilly Limited | Energy | 2011 |
| Goonhilly Solar Limited | Energy | 2014 |
| Gordon Roger Boon Limited | Extraterritorial | 2025 |
| Gourmet Beatz Limited | Hospitality | 2025 |
| GPF Lewis Holdings Ltd | Financial services | 2024 |
| GPF Lewis PLC | Construction | 2006 |
| GPF Lewis Solutions Limited | Construction | 2017 |
| Grange Farm Solar Limited | Energy | 2012 |
| Grange Renewable Energy Limited | Energy | 2011 |
| Grant Klein Advisory Services Ltd | Professional & scientific | 2025 |
| Graphic Box Limited | Professional & scientific | 2007 |
| Green Hill Energy Limited | Administrative & support | 2009 |
| Green Hydrogen 10 Limited | Manufacturing | 2024 |
| Green Hydrogen 2 Limited | Manufacturing | 2022 |
| Green Hydrogen 4 Limited | Manufacturing | 2022 |
| Green Hydrogen 8 Limited | Manufacturing | 2024 |
| Green Hydrogen 9 Limited | Manufacturing | 2024 |
| Green Oaks Developments Ltd | Construction | 2020 |
| Greenhouse Catering Limited | Hospitality | 2022 |
| Greenwood Consultancy Services Limited | Information & communication | 2024 |
| GRK Carpentry Ltd | Manufacturing | 2021 |
| GT Lifting Services Ltd | Construction | 2026 |
| Guardior Security Ltd | Administrative & support | 2005 |
| H & B Solicitors Ltd | Professional & scientific | 2025 |
| HA Technology Innovations Ltd | Information & communication | 2026 |
| Hale Farm Solar Limited | Energy | 2014 |
| Hall Farm Solar Limited | Energy | 2012 |
| Hall Farm Wind Farm Ltd | Energy | 2009 |
| Hallburn Farm Holdings Limited | Professional & scientific | 2016 |
| Hallburn Farm Limited | Energy | 2010 |
| Hamilton & Pollock 2012 Limited | Wholesale & retail | 2012 |