| Fresstart IT Limited | Other services | 2018 |
| Fretco Limited | Manufacturing | 1957 |
| Friendlypay Limited | Information & communication | 2022 |
| Friends Africa Limited | Information & communication | 2020 |
| Friends Housing Ltd | Real estate | 2024 |
| Friends Investment Club Ltd. | Real estate | 2021 |
| Friends Limited | Administrative & support | 1991 |
| Friends of K. J. P. School Limited | Education | 2024 |
| Friends Property Enfield Ltd | Real estate | 2017 |
| Friern Electrical Services Limited | Construction | 2010 |
| Frndlies Ltd | Information & communication | 2025 |
| Fromwell Electrical Services Ltd | Construction | 2024 |
| Frost Atelier Co Ltd | Wholesale & retail | 2026 |
| Frostology Ltd | Extraterritorial | 2025 |
| Fruity-Delights Limited | Hospitality | 2011 |
| FS Developers Ltd | Administrative & support | 2024 |
| FS Hand Car Wash Ltd | Wholesale & retail | 2022 |
| Fsao Enterprise Limited | Wholesale & retail | 2022 |
| FSC Consultancy Limited | Administrative & support | 2025 |
| FSC Garage Ltd | Wholesale & retail | 2023 |
| FSC Stainless & Alloys Ltd | Manufacturing | 2003 |
| FSD London Ltd | Hospitality | 2022 |
| Fuca Investments Limited | Real estate | 2025 |
| Fuel for Learning Limited | Hospitality | 2017 |
| Fuelstrade Ltd | Wholesale & retail | 2016 |
| Fulallys Consultancy Ltd | Professional & scientific | 2014 |
| Fulham Drinks Ltd | Hospitality | 2025 |
| Full on Live Ltd | Wholesale & retail | 2025 |
| Fullvine Properties Limited | Real estate | 2006 |
| Fullworks Media Ltd | Information & communication | 2019 |
| Fully Loaded LDN Ltd | Hospitality | 2022 |
| Fulwood Partners Ltd | Hospitality | 2017 |
| FUN Shui Ltd | Construction | 2025 |
| FUN2 Limited | Wholesale & retail | 2025 |
| Fundamental Properties Ltd | Real estate | 2020 |
| Funky Duck London Limited | Wholesale & retail | 2026 |
| Funky Nails (Abingdon) Ltd | Other services | 2016 |
| Funtastic Uniform Ltd | Manufacturing | 2016 |
| Furnace Lane Limited | Financial services | 2023 |
| Fusion Beech Hill (NO.2) Limited | Real estate | 2016 |
| Fusion Four Telecoms Limited | Information & communication | 2000 |
| Fusion Music Ltd | Wholesale & retail | 2004 |
| Fusion of Hearts CIC | Health & social care | 2024 |
| Future Direction Investments Ltd | Real estate | 2021 |
| Future Fabrics Limited | Wholesale & retail | 1992 |
| Future Green Associates Ltd | Wholesale & retail | 2025 |
| Future Horizons Property Services Ltd | Real estate | 2020 |
| Future Leaders Childcare Limited | Health & social care | 2020 |
| Futuro Holding Limited | Financial services | 2025 |
| FW Construction Ltd | Construction | 2011 |
| Fxiq Pro Limited | Information & communication | 2024 |
| Fyaora Labs Limited | Information & communication | 2023 |
| Fyaora Software Limited | Information & communication | 2023 |
| Fyfield Investments Limited | Extraterritorial | 1956 |
| Fyntech Solutions Ltd | Information & communication | 2022 |
| G & N Home Improvements Ltd | Construction | 2026 |
| G & T Richards Consultancy Limited | Construction | 2015 |
| G Builders & Contractors Ltd | Construction | 2020 |
| G K R Games Limited | Arts & recreation | 1998 |
| G Kurz Consultants Ltd | Extraterritorial | 2004 |
| G Livne Ltd | Professional & scientific | 2007 |
| G London Properties Limited | Real estate | 2011 |
| G Maguire Consultancy Ltd | Professional & scientific | 2019 |
| G Nicastro Ltd | Professional & scientific | 2016 |
| G T Investments Ltd | Financial services | 2023 |
| G Volt Master Ltd | Construction | 2024 |
| G W Bodyshop Limited | Administrative & support | 2005 |
| G&C Highgate Construction Limited | Construction | 2024 |
| G&M Pressure Wash Ltd | Administrative & support | 2023 |
| G&O Ice Cream Ltd | Manufacturing | 2025 |
| G-Pac Services Ltd | Administrative & support | 2025 |
| G-Power 1 Group Company Ltd | Mining & quarrying | 2020 |
| G-Quest Limited | Professional & scientific | 2014 |
| G-Revolution Limited | Manufacturing | 2021 |
| G.D Parvin London Decoration Ltd | Other services | 2020 |
| G.G.H. Hire Limited | Administrative & support | 2002 |
| G.J.A Tech Ventures Limited | Information & communication | 2013 |
| G10 Autos Ltd | Wholesale & retail | 2024 |
| G1C Investments Limited | Households | 2025 |
| G2 Corrosion Protection Limited | Professional & scientific | 2022 |
| G2 Superstore Limited | Wholesale & retail | 2024 |
| G69 Property Ltd | Real estate | 2026 |
| Gabby Clean Ltd | Administrative & support | 2023 |
| Gabciana Limited | Construction | 2016 |
| Gabecem Catering Limited | Hospitality | 2018 |
| Gabrafa Investment Limited | Financial services | 2023 |
| Gaby Grigorescu Transport Ltd | Transport & logistics | 2023 |
| Gabyjoe Ltd | Wholesale & retail | 2015 |
| Gaga Estates Limited | Real estate | 2015 |
| Gakd Sales Ltd | Wholesale & retail | 2026 |
| Gala Trading Ltd | Wholesale & retail | 2021 |
| Galaxy Healthcare and Housing Ltd | Administrative & support | 2022 |
| Galaxy Nail Bar Limited | Other services | 2021 |
| Galloway Polishing Ltd | Other services | 2022 |
| Gallygibson Properties Ltd | Real estate | 2021 |
| Game Changers Media Limited | Information & communication | 2024 |
| Game Changers Records Limited | Manufacturing | 2024 |
| Games Junction Ltd | Information & communication | 2020 |
| Gamze Ciftci Beauty Ltd | Wholesale & retail | 2023 |
| Gangani Janaka Limited | Health & social care | 2009 |