| F.I.R.S.T. MW Ltd | Administrative & support | 2018 |
| F2S Consulting Limited | Professional & scientific | 2023 |
| F488 Ltd | Arts & recreation | 2018 |
| F8 Media Services Limited | Professional & scientific | 2019 |
| FA Vehicles Ltd | Wholesale & retail | 2025 |
| FAB Cleaners Ltd | Construction | 2018 |
| FAB Lets (London) LLP | | 2011 |
| Fabbrica Audio Ltd | Information & communication | 2025 |
| Fabeau Consultancy Limited | Professional & scientific | 2015 |
| Fabuloos Hire Ltd | Other services | 2019 |
| Factor 60 Haulage Limited | Transport & logistics | 2017 |
| Faircross Property Holdings Ltd | Real estate | 2022 |
| Fairfield Renewable Heating Solutions Ltd | Construction | 2023 |
| Fairtipshare Limited | Other services | 2020 |
| Fairways Consulting (Herts) Limited | Professional & scientific | 2022 |
| Fairways Investments Limited | Financial services | 2021 |
| Falcon (Farms) Ltd | Real estate | 2025 |
| Falcon Retail Limited | Wholesale & retail | 2008 |
| Falkin Limited | Information & communication | 2024 |
| Famia Limited | Health & social care | 2019 |
| Family Home Swaps Ltd | Administrative & support | 2020 |
| Family Property Venture Ltd | Real estate | 2023 |
| Fantastik Podcasts Limited | Information & communication | 2020 |
| Faraday Business Advisory Limited | Professional & scientific | 2020 |
| Faraday Estates Limited | Real estate | 2021 |
| Faraday Services Ltd | Households | 2024 |
| Farmacokinetica Limited | Professional & scientific | 2018 |
| Farouse Design Limited | Wholesale & retail | 2006 |
| Farriday Property Limited | Real estate | 2025 |
| Fashion Blueprint Ltd | Other services | 2018 |
| Fashion-N-Fabrics Limited | Wholesale & retail | 2018 |
| Fast 1 Club Ltd | Professional & scientific | 2019 |
| Fast 24 Ltd | Health & social care | 2020 |
| Fast Mora Ltd | Professional & scientific | 2018 |
| Fast-Nuces Alumni Network UK CIC | Other services | 2024 |
| Fastax Ltd | Professional & scientific | 2012 |
| Fatgirls Limited | Hospitality | 2026 |
| Fatlash Ltd | Other services | 2019 |
| Fayers Plumbing & Building Supplies Limited | Wholesale & retail | 1923 |
| FAZ Finance Ltd | Real estate | 2025 |
| FB Bull Limited | Hospitality | 2021 |
| FB Eight Bells Limited | Hospitality | 2020 |
| FB Elephant and Castle Limited | Hospitality | 2022 |
| FB Group Holdings Limited | Financial services | 2020 |
| FB Reading Rooms Limited | Hospitality | 2022 |
| FB the Red COW Limited | Hospitality | 2022 |
| FB the Rising Sun Limited | Hospitality | 2022 |
| Fcpa Food Ltd | Hospitality | 2012 |
| FD Business Support Limited | Administrative & support | 2020 |
| Feast Noble & Co LLP | | 2008 |
| Feedback Consumer Research Limited | Professional & scientific | 2006 |
| Feedmypixel Ltd | Information & communication | 2012 |
| Feel Good Forest School Ltd | Education | 2025 |
| Feel Venture I LP | | 2021 |
| Feenicks Ltd | Administrative & support | 2024 |
| Felicitas Ventures Growth One LLP | | 2022 |
| Felicitas Ventures One LLP | | 2021 |
| Felix Hotels Group Limited | Financial services | 2023 |
| Fellowes Transport Limited | Transport & logistics | 2024 |
| Fellowship House Governors Limited | Professional & scientific | 1954 |
| Fensoms Gym Limited | Arts & recreation | 2021 |
| Fenwood Holdings Ltd | Professional & scientific | 2018 |
| Fergal Storan Limited | Professional & scientific | 2018 |
| Fernlea Consulting Limited | Financial services | 2012 |
| Feromena Ltd | Health & social care | 2017 |
| Festival Formula Limited | Professional & scientific | 2016 |
| Festive Holdings Limited | Real estate | 2021 |
| Feuerstein Holdings Limited | Financial services | 2025 |
| FH2 Holdings Ltd | Financial services | 2024 |
| Fias Global Holdings Ltd | Financial services | 2026 |
| Fidaa Limited | Wholesale & retail | 2024 |
| Field Group Limited | Construction | 2015 |
| Figure AI 10X Opportunity LP | | 2025 |
| Film & TV Sculptor Ltd | Arts & recreation | 2018 |
| Film & TV Unit Cars Limited | Transport & logistics | 2016 |
| Film Scenery Ltd | Construction | 2025 |
| Film Unit Limited | Transport & logistics | 2017 |
| Filterwell International Limited | Wholesale & retail | 1972 |
| Finance and Management Limited | Professional & scientific | 2019 |
| Finance Technologies Ltd | Information & communication | 2023 |
| Finconme Limited | Information & communication | 2015 |
| Find Your Nook Limited | Real estate | 2023 |
| Finda Professional Services Ltd | Professional & scientific | 2019 |
| Finetech Engineering Limited | Professional & scientific | 2012 |
| Fink Lifetime Limited | Professional & scientific | 2010 |
| Finndigo Ltd | Professional & scientific | 2013 |
| Fintech Ventures LLP | | 2021 |
| Fintradia Limited | Professional & scientific | 2015 |
| Fionabooyceramics Ltd | Arts & recreation | 2005 |
| Fiptel Ltd | Information & communication | 2023 |
| Fircroft Associates Ltd | Professional & scientific | 2010 |
| Fire Island Computing Limited | Information & communication | 1998 |
| Firebird Management Limited | Real estate | 2009 |
| Firedrop I GP LLP | | 2023 |
| Firedrop I LP | | 2023 |
| Firedrop II GP LLP | | 2025 |
| Firedrop II LP | | 2025 |
| First Call Building Maintenance Management Limited | Construction | 2009 |
| First Call Civils Ltd | Construction | 2026 |
| First Call Electrics Ltd | Construction | 2026 |