| Feya Consult Ltd | Administrative & support | 2014 |
| FF Vibes Limited | Information & communication | 2024 |
| Fiadh Holdings Limited | Construction | 2025 |
| Fiftyseven Limited | Manufacturing | 2016 |
| Fili Electrics Ltd | Construction | 2006 |
| Filiou Investments Ltd | Real estate | 2018 |
| Filipe Laffan Films Ltd | Information & communication | 2019 |
| Filterhouse Studios Ltd | Real estate | 2017 |
| Finance and Industrial Trust Limited(The) | Professional & scientific | 1903 |
| Financialmum Ltd | Financial services | 2011 |
| Finch Uncorked Ltd | Education | 2018 |
| Finding the One Ltd | Arts & recreation | 2021 |
| Finly Successful Ltd | Real estate | 2021 |
| FINN365 Ltd | Financial services | 2020 |
| Fio's Continental (Potters Bar) Ltd | Wholesale & retail | 2026 |
| Firat Property Ltd | Real estate | 2022 |
| Firegenuk Limited | Other services | 2022 |
| Firenze Property Limited | Real estate | 2025 |
| Firetron Blast Games Ltd | Wholesale & retail | 2024 |
| Firm Data AID Ltd | Information & communication | 2013 |
| First Mile Funding LLP | | 2013 |
| Firstmove Estate Agents Ltd | Real estate | 2023 |
| Fischbein Limited | Professional & scientific | 1989 |
| Fischbein-Saxon Ltd | Manufacturing | 1910 |
| Fisher House RTM Company Limited | Households | 2023 |
| Fishtank MAN Ltd | Manufacturing | 2026 |
| Fist Pump Limited | Wholesale & retail | 2022 |
| Fitness EXP Ltd | Wholesale & retail | 2023 |
| Five Alive Events Ltd | Arts & recreation | 2024 |
| Five Star Property Investments Ltd | Real estate | 2018 |
| Five Thirds Living Limited | Real estate | 2020 |
| Fives Court Close Limited | Real estate | 2015 |
| FIX and Fit Limited | Construction | 2021 |
| Fixeeze Limited | Professional & scientific | 2009 |
| FK Real Estate Limited | Real estate | 2026 |
| FKP Scorpio Entertainment Ltd | Administrative & support | 2016 |
| Flabs Management Ltd | Information & communication | 2024 |
| Flair TV Limited | Information & communication | 2022 |
| Flamingo Lake Limited | Real estate | 2021 |
| Flashfuture Consulting Limited | Other services | 2017 |
| Flashtrading Limited | Hospitality | 2010 |
| Flexal Springs Limited | Real estate | 1937 |
| FLM Beauty Ltd | Wholesale & retail | 2012 |
| Flock Digital Ltd | Information & communication | 2024 |
| Floortex Holdings Limited | Financial services | 2009 |
| Florifix Limited | Construction | 2021 |
| Flossy by Freddy Limited | Wholesale & retail | 2021 |
| Flow Hair and Beauty Studio Ltd | Other services | 2024 |
| Flow With CLO Limited | Arts & recreation | 2024 |
| Flowsia Health Care Limited | Administrative & support | 2019 |
| Fluentpay Ltd | Professional & scientific | 2020 |
| Fluminense Limited | Real estate | 2021 |
| FLY Engineering LLP | | 2014 |
| Flys Legacy CIC | Arts & recreation | 2026 |
| FME Property Investments Ltd | Real estate | 2023 |
| FMS HR Consulting Limited | Administrative & support | 2012 |
| FN Connect LP | | 2026 |
| Fodel Mortgages Limited | Financial services | 2021 |
| Fogarty Freehold Ltd | Real estate | 2022 |
| Fogarty Investments Ltd | Real estate | 2014 |
| Food Development Corporation Ltd | Professional & scientific | 2009 |
| Food Package Ltd | Hospitality | 2025 |
| Foodim Limited | Other services | 2016 |
| Foord Coaching & Consulting Limited | Professional & scientific | 2025 |
| Forbidden Management Ltd | Arts & recreation | 2023 |
| Formula One Designs Limited | Professional & scientific | 1990 |
| Formé and Story Limited | Wholesale & retail | 2025 |
| Fortune Block Management Ltd | Real estate | 2018 |
| Fortune Kookie Ltd | Real estate | 2025 |
| Fortune Pure Block Management Limited | Households | 2024 |
| Fortune Retail Limited | Wholesale & retail | 2023 |
| Foruli Limited | Information & communication | 2005 |
| Forward Thinker Developments Ltd | Information & communication | 2010 |
| Foster Investments Ltd | Real estate | 2021 |
| Fosteringuk Ltd | Health & social care | 2016 |
| Fountain Court (Waltham Abbey) Limited | Real estate | 2013 |
| Fountainx Ltd | Professional & scientific | 2023 |
| Four Wards Management Company Limited | Real estate | 2017 |
| Fourcrowns Limited | Professional & scientific | 1987 |
| Fourteen Feet Ltd | Information & communication | 2016 |
| Fourth Generation Limited | Administrative & support | 2004 |
| Foutou Limited | Hospitality | 2018 |
| Foxes Lane (Cuffley) Management Company Limited | Other services | 1996 |
| Foxy Feet Ltd | Professional & scientific | 2004 |
| Fractal Shore Limited | Information & communication | 2018 |
| Fractured Serenity Limited | Other services | 2023 |
| Fragrance, Lifestyle and Beauty Ltd | Manufacturing | 1973 |
| Fralex Ltd | Financial services | 2015 |
| Frame One Productions Ltd | Professional & scientific | 2013 |
| Francelio Support Services Ltd | Administrative & support | 2020 |
| Francesco Pizza Ltd | Real estate | 2023 |
| Francis Seven Capital Ltd | Real estate | 2025 |
| Franco Holdings Limited | Financial services | 2019 |
| Frankaborough Lodge Ltd | Real estate | 2022 |
| Franks Properties Limited | Administrative & support | 2005 |
| Freddymylove Limited | Information & communication | 2017 |
| Frederick's Group Ltd | Wholesale & retail | 2023 |
| Fredericks Wood Forestry Ltd | Other services | 2022 |
| Freedom International NOW Ltd | Professional & scientific | 2014 |
| Freedom Theme Parks Ltd | Arts & recreation | 2019 |