| Flowerfate Limited | Wholesale & retail | 2019 |
| Flowers of Islington (London) Ltd | Wholesale & retail | 2021 |
| Fluent in Property Limited | Real estate | 2011 |
| Fluential Properties Ltd | Real estate | 2022 |
| Fluxai Group Holdings Ltd | Wholesale & retail | 2025 |
| FLX Automotive Ltd | Wholesale & retail | 2020 |
| Flying Beagle Ltd | Professional & scientific | 2025 |
| Flying Colourz Nursery (UK) Ltd | Education | 2025 |
| FM Draining Ltd | Administrative & support | 2024 |
| FM Nova Ltd | Professional & scientific | 2025 |
| FMA Bell Ltd | Real estate | 2021 |
| FMC Heating Services Ltd | Construction | 2019 |
| FMF Real Estate Ltd | Real estate | 2021 |
| FMT Imports Ltd | Wholesale & retail | 2025 |
| FND Red Circle Ltd | Administrative & support | 2018 |
| FNK Investments Ltd | Real estate | 2022 |
| Foldspark Ltd | Wholesale & retail | 2025 |
| Followbeauty Ltd | Wholesale & retail | 2024 |
| Fome Holdings Limited | Financial services | 2021 |
| Fome Investments Limited | Information & communication | 2021 |
| Fontana Investments Limited | Real estate | 2013 |
| Foodart UK Limited | Wholesale & retail | 2006 |
| Foodit Limited | Information & communication | 2013 |
| Foodos Loados Ltd | Hospitality | 2025 |
| Footpath Films Limited | Information & communication | 2007 |
| Forcefull Regatio Ltd | Professional & scientific | 2015 |
| Ford & Co Consulting Limited | Construction | 2022 |
| Forde Building Services Limited | Construction | 2024 |
| Fordoni Ltd | Other services | 2024 |
| Foresight Intel Ltd | Information & communication | 2026 |
| Forest Hill Nail Care Limited | Other services | 2025 |
| Forever Carpentry Ltd | Manufacturing | 2021 |
| Forever Classics Ltd | Wholesale & retail | 2025 |
| Forever Flair Ltd | Wholesale & retail | 2025 |
| Forever Grace Homes Limited | Health & social care | 2021 |
| Forever Homes Real Estate Ltd | Real estate | 2019 |
| Fori Core Ltd | Health & social care | 2023 |
| Forid ALI Limited | Real estate | 2024 |
| Form Securities Ltd. | Real estate | 1999 |
| Formation (Properties) Limited | Real estate | 1986 |
| Formu Studio Ltd | Arts & recreation | 2026 |
| Formyson Limited | Administrative & support | 2024 |
| Forteks Textile UK Ltd | Wholesale & retail | 2024 |
| Forthtech Capital Limited | Other services | 2017 |
| Fortiarx Ltd | Information & communication | 2020 |
| Fortior Court (RTM) Limited | Households | 2005 |
| Fortis Bridge International Ltd | Wholesale & retail | 2026 |
| Fortius Liquid Investments Ltd | Financial services | 2022 |
| Fortuna Group (London) Limited | Wholesale & retail | 2021 |
| Fortuna Healthcare Limited | Wholesale & retail | 1995 |
| Fortuna.Bambach Limited | Wholesale & retail | 2021 |
| Fortunate Bricks Ltd | Wholesale & retail | 2025 |
| Fortunes Catering Ltd | Hospitality | 2018 |
| Forty Hall Community Vineyard Limited | Agriculture & fishing | 2010 |
| Forty Hill Food and Wine Limited | Wholesale & retail | 2023 |
| Forty Leisure Limited | Real estate | 1993 |
| Forum for African, Afro-Caribbean and Asian Women in Politics Limited | Education | 2013 |
| Forward Drive Health Ltd | Health & social care | 2020 |
| Forward Tailored Scheme Ltd | Financial services | 2026 |
| Foster & Allen Ltd. | Construction | 1998 |
| Foster & Foster Solicitors Ltd | Professional & scientific | 2021 |
| Fosters Associates Limited | Professional & scientific | 2004 |
| Found Space Ltd. | Construction | 2020 |
| Foundation Professional Services Ltd. | Information & communication | 2013 |
| Foundation Scaffolding Ltd | Construction | 2018 |
| Founders Circle Limited | Administrative & support | 2021 |
| Four CS Home Ltd | Health & social care | 2025 |
| Four Star Trading Ltd | Wholesale & retail | 2010 |
| FOX Bear Design Ltd | Professional & scientific | 2025 |
| Fox-Zennith Ross Ltd | Professional & scientific | 2020 |
| Foxdon Group Ltd | Information & communication | 2025 |
| Foxsake Films Limited | Arts & recreation | 2023 |
| FP US Acquired Ltd | Professional & scientific | 2018 |
| FPP Builders Ltd | Construction | 2023 |
| FPS Construction Ltd | Construction | 2025 |
| FR Foods Limited | Real estate | 2025 |
| Fragments LAB Ltd | Information & communication | 2025 |
| Framech Engineering Ltd | Professional & scientific | 2017 |
| Francesca Santoro Consulting Ltd | Professional & scientific | 2024 |
| Francine Financials Ltd | Real estate | 2024 |
| Franciscazom Limited | Real estate | 2008 |
| Frane Ltd | Wholesale & retail | 2017 |
| Franex Limited | Professional & scientific | 2015 |
| Franice Cleaning Services Limited | Administrative & support | 2025 |
| Franphil Childminding Ltd | Health & social care | 2015 |
| Fred & Femi Master Decorators Ltd | Construction | 2025 |
| Fred Knightsbridge Ltd | Construction | 2018 |
| Fredco & Sons Ltd | Construction | 2020 |
| Freeney Ltd | Financial services | 2023 |
| Freeway Services Limited | Information & communication | 2004 |
| Freeyourself Ltd | Wholesale & retail | 2023 |
| French 4 Less Ltd | Education | 2020 |
| French Rose Nails Limited | Other services | 2026 |
| Frep Ltd | Professional & scientific | 2017 |
| Fresh and Clean Ltd | Construction | 2022 |
| Fresh Bathrooms Ltd | Construction | 2026 |
| Fresh Help Limited | Construction | 2020 |
| Fresh Rush London Ltd | Wholesale & retail | 2023 |
| Freshly Roasted Limited | Hospitality | 2013 |
| Freshsteps Limited | Education | 2008 |