| FPC Property Services Ltd | Construction | 2015 |
| Framebeam Limited | Financial services | 1985 |
| Frameworx Media Limited | Information & communication | 2007 |
| Francis and Co Consultancy Limited | Professional & scientific | 2020 |
| Francisc Pro Ltd | Transport & logistics | 2025 |
| Frank L. Ross (Insurance Brokers) Limited | Financial services | 1968 |
| Franklin Weir Ltd | Administrative & support | 2024 |
| Franlin Limited | Construction | 2025 |
| Fredericks Limited | Professional & scientific | 2008 |
| Freed Family Investments Limited | Real estate | 2023 |
| Freedman Fabrics Limited | Wholesale & retail | 1985 |
| Freehold Enterprises Limited | Real estate | 2013 |
| Freehold Property Services London Limited | Administrative & support | 2013 |
| Freeing Potential CIC | Health & social care | 2023 |
| Freeman Brickwork Ltd | Construction | 2010 |
| Frescaja Consulting Limited | Administrative & support | 2014 |
| Fresh Mind Works Limited | Other services | 2012 |
| Fresta Management Services Limited | Professional & scientific | 2007 |
| Freya Likes IT Limited | Other services | 2016 |
| Frigga Charmed Life, UK Ltd | Manufacturing | 2025 |
| Frithwood Holdings Ltd | Financial services | 2026 |
| Frogpop Studios Limited | Professional & scientific | 2024 |
| From the Plinth Limited | Professional & scientific | 2016 |
| Frontiers Consulting Ltd | Professional & scientific | 2021 |
| Frosty Knickers Limited | Administrative & support | 2018 |
| Frown Ltd | Administrative & support | 2020 |
| Fruit PIE Music Productions Limited | Arts & recreation | 1998 |
| Fruitsbaskets Limited | Wholesale & retail | 2025 |
| Frunzik Communications Ltd | Information & communication | 2022 |
| FSP Consultants LLP | | 2012 |
| Fueline Car Brokerage Ltd | Wholesale & retail | 2025 |
| Fues Limited | Information & communication | 2008 |
| Full Circle Hospitality Ltd | Other services | 2024 |
| Full Storey Ltd | Construction | 2020 |
| Futora Digital Ltd | Information & communication | 2015 |
| Future Codes Ltd | Construction | 1998 |
| Future of Work Ltd | Information & communication | 2020 |
| Future Production Group Ltd | Manufacturing | 2023 |
| Futureminds Consulting Limited | Professional & scientific | 2025 |
| Fxintelligence Limited | Professional & scientific | 2024 |
| G & H Studio Limited | Manufacturing | 2023 |
| G & S Packing UK Limited | Wholesale & retail | 2016 |
| G & T (Barbers) Limited | Other services | 2018 |
| G C Medical Limited | Health & social care | 2019 |
| G R S Property Investments Limited | Administrative & support | 2017 |
| G S Notary Public Limited | Professional & scientific | 2015 |
| G Ursaru Limited | Construction | 2017 |
| G Vathy Books Ltd | Professional & scientific | 2025 |
| G&N Professionals Ltd | Transport & logistics | 2017 |
| G&Z Construction Limited | Construction | 2026 |
| G. S. C. RO Ltd | Wholesale & retail | 2014 |
| G. Sheret & Associates Ltd | Professional & scientific | 2008 |
| G.J.S. Builders Limited | Construction | 2005 |
| G7 Glazing Limited | Construction | 2021 |
| Gabcom Limited | Other services | 2015 |
| Gabriel Property Investments Ltd | Administrative & support | 2013 |
| Gabriel Science Ltd | Construction | 2021 |
| Gabs Consultancy Ltd | Real estate | 2022 |
| Gadget Store Ltd | Wholesale & retail | 2014 |
| Gainsborough Hotels Ltd | Hospitality | 2020 |
| Galabright Properties Limited | Construction | 1988 |
| Galitan Services Limited | Information & communication | 2019 |
| Ganda Investments Limited | Real estate | 1990 |
| Gandhi Expresss Ltd | Hospitality | 2026 |
| GAP (Garden Products) Limited | Manufacturing | 1986 |
| Gap-Display Limited | Manufacturing | 1981 |
| Garden of Afruika Ltd | Hospitality | 2026 |
| Gardens 24/7 Ltd | Construction | 2025 |
| Gardner-Lewis Group Ltd | Professional & scientific | 2026 |
| Garlic 'N' Ginger Ltd | Wholesale & retail | 2019 |
| Garrett Decorating Ltd | Construction | 2021 |
| Garwood Glazing Contractors Ltd | Construction | 2015 |
| Gary Green Limited | Professional & scientific | 2021 |
| Gary Green Monumental Mason Limited | Administrative & support | 2016 |
| GAS Certification Services Ltd | Construction | 2026 |
| GAS Flooring Ltd | Construction | 2026 |
| GAS GUY (London) Limited | Construction | 2007 |
| Gascoigne London Ltd | Wholesale & retail | 2019 |
| Gasflo Utilities Limited | Construction | 2022 |
| Gaslight Services Ltd | Construction | 2017 |
| Gaynes Park Property Limited | Real estate | 2016 |
| GB Nannies Limited | Administrative & support | 2014 |
| GBA Romans Services Ltd | Wholesale & retail | 2022 |
| GBC Partners Ltd | Administrative & support | 2025 |
| Gbmt Limited | Administrative & support | 2012 |
| Gcfl Ltd | Real estate | 2023 |
| Gcuoba GB & Ireland CIC | Administrative & support | 2025 |
| GDA Financial Partners LLP | | 2011 |
| Gdan & Co Limited | Professional & scientific | 2019 |
| GDW London Ltd | Wholesale & retail | 2022 |
| Geevie Limited | Administrative & support | 2022 |
| Gelb & Co. Ltd | Real estate | 2014 |
| GEM and I Limited | Administrative & support | 2025 |
| Gemini Acres Limited | Agriculture & fishing | 2020 |
| GENER8 NOW Limited | Wholesale & retail | 2007 |
| General Algorithmics Limited | Information & communication | 2001 |
| General Pacific Properties Limited | Construction | 2001 |
| General Surgery London Ltd | Health & social care | 2019 |
| Genesis Developments (London) Limited | Construction | 2015 |
| Genesys Office Furniture Limited | Wholesale & retail | 2014 |